0001711269-21-000023 | 10-K | XBRL Viewer

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Cover Page - USD ($)	12 Months Ended
Cover Page - USD ($)	Dec. 31, 2020	Feb. 19, 2021	Jun. 30, 2020
Entity Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-38515
Entity Registrant Name	EVERGY, INC.
Entity Tax Identification Number	82-2733395
Entity Incorporation, State or Country Code	MO
Entity Address, Address Line One	1200 Main Street
Entity Address, City or Town	Kansas City
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64105
City Area Code	816
Local Phone Number	556-2200
Title of 12(b) Security	Evergy, Inc. common stock
Trading Symbol	EVRG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		226,944,941
Entity Central Index Key	0001711269
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Fiscal Year Focus	2020
Entity Public Float			$ 13,410,149,293
Evergy Kansas Central
Entity Information [Line Items]
Entity File Number	001-03523
Entity Registrant Name	EVERGY KANSAS CENTRAL, INC.
Entity Tax Identification Number	48-0290150
Entity Incorporation, State or Country Code	KS
Entity Address, Address Line One	818 South Kansas Avenue
Entity Address, City or Town	Topeka
Entity Address, State or Province	KS
Entity Address, Postal Zip Code	66612
City Area Code	785
Local Phone Number	575-6300
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1
Entity Central Index Key	0000054507
Evergy Metro
Entity Information [Line Items]
Entity File Number	000-51873
Entity Registrant Name	EVERGY METRO, INC.
Entity Tax Identification Number	44-0308720
Entity Incorporation, State or Country Code	MO
Entity Address, Address Line One	1200 Main Street
Entity Address, City or Town	Kansas City
Entity Address, State or Province	MO
Entity Address, Postal Zip Code	64105
City Area Code	816
Local Phone Number	556-2200
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		1
Entity Central Index Key	0000054476

Consolidated Statements of Comprehensive Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
OPERATING REVENUES	$ 4,913.4	$ 5,147.8	$ 4,275.9
OPERATING EXPENSES:
Fuel and purchased power	1,099.0	1,265.0	1,078.7
SPP network transmission costs	263.2	251.3	259.9
Operating and maintenance	1,163.0	1,218.5	1,115.8
Depreciation and amortization	880.1	861.7	618.8
Taxes other than income tax	364.2	365.5	269.1
Total Operating Expenses	3,769.5	3,962.0	3,342.3
INCOME FROM OPERATIONS	1,143.9	1,185.8	933.6
OTHER INCOME (EXPENSE):
Investment earnings	10.8	11.0	8.8
Other income	31.3	26.9	15.5
Other expense	(78.2)	(76.9)	(78.7)
Total Other Expense, Net	(36.1)	(39.0)	(54.4)
Interest expense	383.9	374.0	279.6
INCOME BEFORE INCOME TAXES	723.9	772.8	599.6
Interest expense	102.2	97.0	59.0
Equity in earnings of equity method investees, net of income taxes	8.3	9.8	5.4
NET INCOME	630.0	685.6	546.0
Less: Net income attributable to noncontrolling interests	11.7	15.7	10.2
Net income attributable to Evergy, Inc.	$ 618.3	$ 669.9	$ 535.8
BASIC AND DILUTED EARNINGS PER AVERAGE COMMON SHARE OUTSTANDING ATTRIBUTABLE TO EVERGY, INC. (see Note 1)
Basic earnings per common share (in dollars per share)	$ 2.72	$ 2.80	$ 2.50
Diluted earnings per common share (in dollars per share)	$ 2.72	$ 2.79	$ 2.50
AVERAGE COMMON SHARES OUTSTANDING
Basic (in shares)	227.2	239.5	213.9
Diluted (in shares)	227.5	239.9	214.1
COMPREHENSIVE INCOME
Net income	$ 630.0	$ 685.6	$ 546.0
Derivative hedging activity
Loss on derivative hedging instruments	0.0	(64.4)	(5.4)
Income tax benefit	0.0	16.5	1.4
Net loss on derivative hedging instruments	0.0	(47.9)	(4.0)
Reclassification to expenses, net of tax	3.0	1.5	0.0
Derivative hedging activity, net of tax	3.0	(46.4)	(4.0)
Defined benefit pension plans
Net gain (loss) arising during period	(3.0)	(0.8)	1.4
Income tax expense (benefit)	0.7	0.2	(0.4)
Net gain (loss) arising during period, net of tax	(2.3)	(0.6)	1.0
Amortization of net losses included in net periodic benefit costs, net of tax	(0.1)	0.0	0.0
Change in unrecognized pension expense, net of tax	(2.4)	(0.6)	1.0
Total other comprehensive income (loss)	0.6	(47.0)	(3.0)
COMPREHENSIVE INCOME	630.6	638.6	543.0
Less: comprehensive income attributable to noncontrolling interest	11.7	15.7	10.2
COMPREHENSIVE INCOME	$ 618.9	$ 622.9	$ 532.8

Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 144.9	$ 23.2
Receivables, net of allowance for credit losses of $19.3 and $10.5, respectively	273.9	228.5
Accounts receivable pledged as collateral	360.0	339.0
Fuel inventory and supplies	504.5	481.6
Income taxes receivable	62.9	85.5
Regulatory assets	206.2	231.7
Prepaid expenses and other assets	71.9	78.2
Total Current Assets	1,624.3	1,467.7
PROPERTY, PLANT AND EQUIPMENT, NET	19,951.0	19,184.4
OTHER ASSETS:
Regulatory assets	1,868.2	1,740.5
Nuclear decommissioning trust fund	652.1	573.2
Goodwill	2,336.6	2,336.6
Other	527.7	511.5
Total Other Assets	5,384.6	5,161.8
TOTAL ASSETS	27,114.8	25,975.9
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
Notes payable and commercial paper	315.0	561.9
Collateralized note payable	360.0	339.0
Accounts payable	654.0	528.8
Accrued taxes	143.8	145.1
Accrued interest	123.4	122.3
Regulatory liabilities	26.1	63.3
Asset retirement obligations	40.2	71.3
Accrued compensation and benefits	55.5	59.2
Other	182.6	161.6
Total Current Liabilities	2,355.8	2,335.9
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Deferred income taxes	1,664.8	1,744.4
Unamortized investment tax credits	186.7	375.4
Regulatory liabilities	2,638.8	2,248.3
Pension and post-retirement liability	1,149.4	1,017.6
Asset retirement obligations	901.7	602.8
Other	308.2	340.7
Total Long-Term Liabilities	16,040.5	15,094.7
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value 226,836,670 and 226,641,443 shares issued, stated value	7,080.0	7,070.4
Retained earnings	1,702.8	1,551.5
Accumulated other comprehensive loss	(49.4)	(50.0)
Total Evergy, Inc. Shareholders' Equity	8,733.4	8,571.9
Noncontrolling Interests	(14.9)	(26.6)
Total Equity	8,718.5	8,545.3	$ 9,990.7	$ 3,860.4
TOTAL LIABILITIES AND EQUITY	27,114.8	25,975.9
Consolidated Entity Excluding Variable Interest Entities (VIE)
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Variable Interest Entities
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	154.9	162.0
CURRENT LIABILITIES:
Current maturities of long-term debt	18.8	32.3
Accrued interest	0.1	0.3
LONG-TERM LIABILITIES:
Long-term debt, net	$ 0.0	$ 18.8

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowance for credit losses	$ 19.3	$ 10.5
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,836,670	226,641,443

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 630.0	$ 685.6	$ 546.0
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	880.1	861.7	618.8
Amortization of nuclear fuel	58.3	51.4	43.6
Amortization of deferred refueling outage	25.4	25.5	21.2
Amortization of corporate-owned life insurance	20.1	19.8	22.6
Non-cash compensation	16.0	16.3	29.9
Net deferred income taxes and credits	126.9	121.5	124.2
Allowance for equity funds used during construction	(17.2)	(2.2)	(3.1)
Payments for asset retirement obligations	(18.4)	(17.8)	(22.4)
Equity in earnings of equity method investees, net of income taxes	(8.3)	(9.8)	(5.4)
Income from corporate-owned life insurance	(8.2)	(29.6)	(2.3)
Other	0.8	(3.2)	(5.2)
Changes in working capital items:
Accounts receivable	(4.9)	(23.1)	265.1
Accounts receivable pledged as collateral	(21.0)	26.0	(185.0)
Fuel inventory and supplies	(22.3)	29.9	54.7
Prepaid expenses and other current assets	16.9	43.4	(128.1)
Accounts payable	134.3	16.9	56.7
Accrued taxes	6.7	(8.2)	(76.4)
Other current liabilities	(98.9)	(59.4)	92.0
Changes in other assets	119.5	79.8	66.8
Changes in other liabilities	(82.0)	(75.5)	(15.9)
Cash Flows from Operating Activities	1,753.8	1,749.0	1,497.8
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,560.3)	(1,210.1)	(1,069.7)
Cash acquired from the merger with Great Plains Energy	0.0	0.0	1,154.2
Purchase of securities - trusts	(65.6)	(55.8)	(117.5)
Sale of securities - trusts	56.5	47.3	117.7
Investment in corporate-owned life insurance	(19.1)	(18.3)	(17.1)
Proceeds from investment in corporate-owned life insurance	65.9	161.7	6.8
Proceeds from settlement of interest rate swap	0.0	0.0	140.6
Other investing activities	(11.1)	(5.1)	(17.6)
Cash Flows from (used in) Investing Activities	(1,533.7)	(1,080.3)	197.4
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net	(246.9)	(176.7)	(104.0)
Proceeds from term loan facility	0.0	1,000.0	0.0
Repayment of term loan facility	0.0	1,000.0	0.0
Collateralized short-term borrowings, net	21.0	(26.0)	185.0
Proceeds from long-term debt	888.8	2,372.7	290.9
Retirements of long-term debt	(251.1)	(701.1)	(395.8)
Retirements of long-term debt of variable interest entities	(32.3)	(30.3)	(28.5)
Payment for settlement of interest rate swap accounted for as a cash flow hedge	0.0	(69.8)	0.0
Borrowings against cash surrender value of corporate-owned life insurance	55.5	59.4	56.5
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(54.8)	(127.5)	(3.9)
Cash dividends paid	(465.0)	(462.5)	(475.0)
Repurchase of common stock under repurchase plan	0.0	(1,628.7)	(1,042.3)
Distributions to shareholders of noncontrolling interests	0.0	(8.6)	0.0
Other financing activities	(13.6)	(6.7)	(21.3)
Cash Flows from (used in) Financing Activities	(98.4)	(805.8)	(1,538.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	121.7	(137.1)	156.8
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	23.2	160.3	3.5
End of period	$ 144.9	$ 23.2	$ 160.3

Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Stock	Retained earnings	AOCI	Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2017		142,094,275
Beginning balance at Dec. 31, 2017	$ 3,860.4	$ 2,734.8	$ 1,173.3	$ 0.0	$ (47.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8		10.2
Issuance of stock to Great Plains Energy shareholders (in shares)		128,947,518
Issuance of stock to Great Plains Energy shareholders	6,979.9	$ 6,979.9
Issuance of restricted common stock (in shares)		122,505
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		533,273
Issuance of stock compensation and reinvested dividends, net of tax withholding	(16.7)	$ (16.7)
Dividends declared on common stock	(362.1)		(362.1)
Dividend equivalents declared	(1.0)		(1.0)
Stock compensation expense	29.9	$ 29.9
Repurchase of common stock (in shares)		(16,371,319)
Repurchase of common stock under repurchase plan	(1,042.3)	$ (1,042.3)
Derivative hedging activity, net of tax	(4.0)			(4.0)
Change in unrecognized pension expense, net of tax	1.0			1.0
Other	(0.4)	$ (0.4)
Ending balance (in shares) at Dec. 31, 2018		255,326,252
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	(3.0)	(37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9		15.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		111,849
Issuance of stock compensation and reinvested dividends, net of tax withholding	(2.4)	$ (2.4)
Dividends declared on common stock	(462.5)		(462.5)
Dividend equivalents declared	(1.9)		(1.9)
Stock compensation expense	16.3	$ 16.3
Repurchase of common stock (in shares)		(28,796,658)
Repurchase of common stock under repurchase plan	(1,628.7)	$ (1,628.7)
Consolidation of noncontrolling interests	3.8				3.8
Distributions to shareholders of noncontrolling interests	(8.6)				(8.6)
Derivative hedging activity, net of tax	(46.4)			(46.4)
Change in unrecognized pension expense, net of tax	(0.6)			(0.6)
Ending balance (in shares) at Dec. 31, 2019		226,641,443
Ending balance at Dec. 31, 2019	8,545.3	$ 7,070.4	1,551.5	(50.0)	(26.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	630.0		618.3		11.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		195,227
Issuance of stock compensation and reinvested dividends, net of tax withholding	(5.9)	$ (5.9)
Dividends declared on common stock	(465.0)		(465.0)
Dividend equivalents declared	(2.0)		(2.0)
Stock compensation expense	16.0	16.0
Derivative hedging activity, net of tax	3.0			3.0
Change in unrecognized pension expense, net of tax	(2.4)			(2.4)
Other	(0.5)	$ (0.5)
Ending balance (in shares) at Dec. 31, 2020		226,836,670
Ending balance at Dec. 31, 2020	$ 8,718.5	$ 7,080.0	$ 1,702.8	$ (49.4)	$ (14.9)

Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]
Dividends declared on common stock (in dollars per share)	$ 2.05	$ 1.93	$ 1.735

Consolidated Statements of Income - Evergy Kansas Central, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING REVENUES	$ 4,913.4	$ 5,147.8	$ 4,275.9
OPERATING EXPENSES:
Fuel and purchased power	1,099.0	1,265.0	1,078.7
SPP network transmission costs	263.2	251.3	259.9
Operating and maintenance	1,163.0	1,218.5	1,115.8
Depreciation and amortization	880.1	861.7	618.8
Taxes other than income tax	364.2	365.5	269.1
Total Operating Expenses	3,769.5	3,962.0	3,342.3
INCOME FROM OPERATIONS	1,143.9	1,185.8	933.6
OTHER INCOME (EXPENSE):
Investment earnings (loss)	10.8	11.0	8.8
Other income	31.3	26.9	15.5
Other expense	(78.2)	(76.9)	(78.7)
Total Other Expense, Net	(36.1)	(39.0)	(54.4)
Interest expense	383.9	374.0	279.6
INCOME BEFORE INCOME TAXES	723.9	772.8	599.6
Income tax expense (benefit)	102.2	97.0	59.0
Equity in earnings of equity method investees, net of income taxes	8.3	9.8	5.4
NET INCOME	630.0	685.6	546.0
Less: Net income attributable to noncontrolling interests	11.7	15.7	10.2
Net income attributable to Evergy, Inc.	618.3	669.9	535.8
Evergy Kansas Central
OPERATING REVENUES	2,418.1	2,507.4	2,614.9
OPERATING EXPENSES:
Fuel and purchased power	427.6	493.0	599.2
SPP network transmission costs	263.2	251.3	259.9
Operating and maintenance	513.6	530.5	640.7
Depreciation and amortization	453.1	443.8	390.9
Taxes other than income tax	193.3	192.3	173.7
Total Operating Expenses	1,850.8	1,910.9	2,064.4
INCOME FROM OPERATIONS	567.3	596.5	550.5
OTHER INCOME (EXPENSE):
Investment earnings (loss)	4.8	4.1	(0.6)
Other income	21.4	23.1	13.9
Other expense	(38.9)	(40.1)	(46.8)
Total Other Expense, Net	(12.7)	(12.9)	(33.5)
Interest expense	167.6	177.0	176.8
INCOME BEFORE INCOME TAXES	387.0	406.6	340.2
Income tax expense (benefit)	155.8	52.1	(4.3)
Equity in earnings of equity method investees, net of income taxes	4.6	4.6	4.6
NET INCOME	235.8	359.1	349.1
Less: Net income attributable to noncontrolling interests	11.7	15.7	10.2
Net income attributable to Evergy, Inc.	$ 224.1	$ 343.4	$ 338.9

Consolidated Balance Sheets - Evergy Kansas Central, Inc - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 144.9	$ 23.2
Receivables, net of allowance for credit losses of $7.5 and $3.8, respectively	273.9	228.5
Accounts receivable pledged as collateral	360.0	339.0
Fuel inventory and supplies	504.5	481.6
Income taxes receivable	62.9	85.5
Regulatory assets	206.2	231.7
Prepaid expenses and other assets	71.9	78.2
Total Current Assets	1,624.3	1,467.7
PROPERTY, PLANT AND EQUIPMENT, NET	19,951.0	19,184.4
OTHER ASSETS:
Regulatory assets	1,868.2	1,740.5
Nuclear decommissioning trust fund	652.1	573.2
Other	527.7	511.5
Total Other Assets	5,384.6	5,161.8
TOTAL ASSETS	27,114.8	25,975.9
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
Notes payable and commercial paper	315.0	561.9
Collateralized note payable	360.0	339.0
Accounts payable	654.0	528.8
Accrued taxes	143.8	145.1
Accrued interest	123.4	122.3
Regulatory liabilities	26.1	63.3
Asset retirement obligations	40.2	71.3
Accrued compensation and benefits	55.5	59.2
Other	182.6	161.6
Total Current Liabilities	2,355.8	2,335.9
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Deferred income taxes	1,664.8	1,744.4
Unamortized investment tax credits	186.7	375.4
Regulatory liabilities	2,638.8	2,248.3
Pension and post-retirement liability	1,149.4	1,017.6
Asset retirement obligations	901.7	602.8
Other	308.2	340.7
Total Long-Term Liabilities	16,040.5	15,094.7
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock	7,080.0	7,070.4
Retained earnings	1,702.8	1,551.5
Total Evergy, Inc. Shareholders' Equity	8,733.4	8,571.9
Noncontrolling Interests	(14.9)	(26.6)
Total Equity	8,718.5	8,545.3
TOTAL LIABILITIES AND EQUITY	27,114.8	25,975.9
Evergy Kansas Central
CURRENT ASSETS:
Cash and cash equivalents	28.7	5.2
Receivables, net of allowance for credit losses of $7.5 and $3.8, respectively	218.9	140.4
Related party receivables	6.7	9.9
Accounts receivable pledged as collateral	180.0	171.0
Fuel inventory and supplies	276.4	266.4
Income taxes receivable	25.3	30.4
Regulatory assets	96.2	93.3
Prepaid expenses and other assets	27.4	34.3
Total Current Assets	859.6	750.9
PROPERTY, PLANT AND EQUIPMENT, NET	10,193.6	9,864.9
OTHER ASSETS:
Regulatory assets	800.1	730.4
Nuclear decommissioning trust fund	309.8	272.5
Other	271.1	266.0
Total Other Assets	1,381.0	1,268.9
TOTAL ASSETS	12,589.1	12,046.7
CURRENT LIABILITIES:
Current maturities of long-term debt	0.0	250.0
Notes payable and commercial paper	50.0	249.2
Collateralized note payable	180.0	171.0
Accounts payable	280.1	200.5
Related party payables	21.7	14.8
Accrued taxes	101.5	98.7
Accrued interest	72.8	74.2
Regulatory liabilities	11.9	42.3
Asset retirement obligations	11.2	23.3
Accrued compensation and benefits	11.1	14.2
Other	133.5	116.0
Total Current Liabilities	892.6	1,286.5
LONG-TERM LIABILITIES:
Long-term debt, net	3,931.5	3,436.1
Deferred income taxes	824.5	817.7
Unamortized investment tax credits	65.7	253.2
Regulatory liabilities	1,461.0	1,132.5
Pension and post-retirement liability	560.3	495.5
Asset retirement obligations	416.0	249.6
Other	156.7	151.8
Total Long-Term Liabilities	7,415.7	6,555.2
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock	2,737.6	2,737.6
Retained earnings	1,558.1	1,494.0
Total Evergy, Inc. Shareholders' Equity	4,295.7	4,231.6
Noncontrolling Interests	(14.9)	(26.6)
Total Equity	4,280.8	4,205.0
TOTAL LIABILITIES AND EQUITY	12,589.1	12,046.7
Consolidated Entity Excluding Variable Interest Entities (VIE)
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Consolidated Entity Excluding Variable Interest Entities (VIE) \| Evergy Kansas Central
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	10,193.6	9,864.9
CURRENT LIABILITIES:
Current maturities of long-term debt	0.0	250.0
LONG-TERM LIABILITIES:
Long-term debt, net	3,931.5	3,436.1
Variable Interest Entities
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	154.9	162.0
CURRENT LIABILITIES:
Current maturities of long-term debt	18.8	32.3
Accrued interest	0.1	0.3
LONG-TERM LIABILITIES:
Long-term debt, net	0.0	18.8
Variable Interest Entities \| Evergy Kansas Central
CURRENT ASSETS:
PROPERTY, PLANT AND EQUIPMENT, NET	154.9	162.0
CURRENT LIABILITIES:
Current maturities of long-term debt	18.8	32.3
LONG-TERM LIABILITIES:
Long-term debt, net	$ 0.0	$ 18.8

Consolidated Balance Sheets - Evergy Kansas Central, Inc (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Allowance for credit losses	$ 19.3	$ 10.5
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,836,670	226,641,443
Evergy Kansas Central
Allowance for credit losses	$ 7.5	$ 3.8
Common stock - shares authorized (in shares)	1,000	1,000
Common stock - par value (in dollars per share)	$ 0.01	$ 0.01
Common stock - shares issued (in shares)	1	1

Consolidated Statements of Cash Flows - Evergy Kansas Central, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 630.0	$ 685.6	$ 546.0
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	880.1	861.7	618.8
Amortization of nuclear fuel	58.3	51.4	43.6
Amortization of deferred refueling outage	25.4	25.5	21.2
Amortization of corporate-owned life insurance	20.1	19.8	22.6
Non-cash compensation	16.0	16.3	29.9
Net deferred income taxes and credits	126.9	121.5	124.2
Allowance for equity funds used during construction	(17.2)	(2.2)	(3.1)
Payments for asset retirement obligations	(18.4)	(17.8)	(22.4)
Equity in earnings of equity method investees, net of income taxes	(8.3)	(9.8)	(5.4)
Income from corporate-owned life insurance	(8.2)	(29.6)	(2.3)
Other	0.8	(3.2)	(5.2)
Changes in working capital items:
Accounts receivable	(4.9)	(23.1)	265.1
Accounts receivable pledged as collateral	(21.0)	26.0	(185.0)
Fuel inventory and supplies	(22.3)	29.9	54.7
Prepaid expenses and other current assets	16.9	43.4	(128.1)
Accounts payable	134.3	16.9	56.7
Accrued taxes	6.7	(8.2)	(76.4)
Other current liabilities	(98.9)	(59.4)	92.0
Changes in other assets	119.5	79.8	66.8
Changes in other liabilities	(82.0)	(75.5)	(15.9)
Cash Flows from Operating Activities	1,753.8	1,749.0	1,497.8
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,560.3)	(1,210.1)	(1,069.7)
Purchase of securities - trusts	(65.6)	(55.8)	(117.5)
Sale of securities - trusts	56.5	47.3	117.7
Investment in corporate-owned life insurance	(19.1)	(18.3)	(17.1)
Proceeds from investment in corporate-owned life insurance	65.9	161.7	6.8
Other investing activities	(11.1)	(5.1)	(17.6)
Cash Flows from (used in) Investing Activities	(1,533.7)	(1,080.3)	197.4
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net	(246.9)	(176.7)	(104.0)
Collateralized short-term debt, net	21.0	(26.0)	185.0
Proceeds from long-term debt	888.8	2,372.7	290.9
Retirements of long-term debt	(251.1)	(701.1)	(395.8)
Retirements of long-term debt of variable interest entities	(32.3)	(30.3)	(28.5)
Borrowings against cash surrender value of corporate-owned life insurance	55.5	59.4	56.5
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(54.8)	(127.5)	(3.9)
Cash dividends paid	(465.0)	(462.5)	(475.0)
Distributions to shareholders of noncontrolling interests	0.0	(8.6)	0.0
Other financing activities	(13.6)	(6.7)	(21.3)
Cash Flows from (used in) Financing Activities	(98.4)	(805.8)	(1,538.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	121.7	(137.1)	156.8
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	23.2	160.3	3.5
End of period	144.9	23.2	160.3
Evergy Kansas Central
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	235.8	359.1	349.1
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	453.1	443.8	390.9
Amortization of nuclear fuel	28.8	25.6	26.0
Amortization of deferred refueling outage	12.7	12.8	13.7
Amortization of corporate-owned life insurance	20.1	19.8	22.6
Non-cash compensation	0.0	0.0	19.9
Net deferred income taxes and credits	146.6	11.6	(2.2)
Allowance for equity funds used during construction	(9.1)	0.0	(2.9)
Payments for asset retirement obligations	(2.2)	(14.8)	(12.0)
Equity in earnings of equity method investees, net of income taxes	(4.6)	(4.6)	(4.6)
Income from corporate-owned life insurance	(8.2)	(29.0)	(2.3)
Other	(5.5)	(5.5)	(5.4)
Changes in working capital items:
Accounts receivable	(33.8)	(65.9)	207.9
Accounts receivable pledged as collateral	(9.0)	14.0	(185.0)
Fuel inventory and supplies	(9.4)	10.9	17.3
Prepaid expenses and other current assets	10.0	(11.7)	(134.2)
Accounts payable	111.6	6.9	(17.6)
Accrued taxes	(6.7)	20.2	(24.1)
Other current liabilities	(95.5)	12.1	88.3
Changes in other assets	42.9	47.0	42.7
Changes in other liabilities	(30.2)	(29.5)	(36.2)
Cash Flows from Operating Activities	847.4	822.8	751.9
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(719.0)	(596.1)	(713.3)
Purchase of securities - trusts	(20.2)	(21.8)	(99.4)
Sale of securities - trusts	18.6	21.6	104.2
Investment in corporate-owned life insurance	(18.3)	(17.6)	(17.1)
Proceeds from investment in corporate-owned life insurance	63.8	158.9	6.8
Other investing activities	(2.2)	(3.2)	(8.6)
Cash Flows from (used in) Investing Activities	(677.3)	(458.2)	(727.4)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net	(199.2)	(162.5)	133.7
Collateralized short-term debt, net	9.0	(14.0)	185.0
Proceeds from long-term debt	492.7	294.7	121.9
Retirements of long-term debt	(250.0)	(300.0)	(121.9)
Retirements of long-term debt of variable interest entities	(32.3)	(30.3)	(28.5)
Borrowings against cash surrender value of corporate-owned life insurance	52.7	56.5	56.5
Repayment of borrowings against cash surrender value of corporate-owned life insurance	(53.7)	(125.4)	(3.9)
Cash dividends paid	(160.0)	(110.0)	(305.1)
Distributions to shareholders of noncontrolling interests	0.0	(8.6)	0.0
Other financing activities	(5.8)	(4.3)	(21.2)
Cash Flows from (used in) Financing Activities	(146.6)	(403.9)	16.5
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	23.5	(39.3)	41.0
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	5.2	44.5	3.5
End of period	$ 28.7	$ 5.2	$ 44.5

Consolidated Statements of Changes in Equity - Evergy Kansas Central, Inc - USD ($) $ in Millions	Total	Common Stock	Retained earnings	Non-controlling interests	Evergy Kansas Central	Evergy Kansas Central Common Stock	Evergy Kansas Central Retained earnings	Evergy Kansas Central Non-controlling interests
Beginning balance (in shares) at Dec. 31, 2017		142,094,275				142,094,275
Beginning balance at Dec. 31, 2017	$ 3,860.4	$ 2,734.8	$ 1,173.3	$ (47.7)	$ 3,860.4	$ 2,734.8	$ 1,173.3	$ (47.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8	10.2	349.1		338.9	10.2
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		533,273				516,990
Issuance of stock compensation and reinvested dividends, net of tax withholding	(16.7)	$ (16.7)			(17.2)	$ (17.2)
Stock Canceled During Period Shares Net						(142,611,264)
Stock Canceled During Period, Value					0.0
Dividends declared on common stock	(362.1)		(362.1)		(251.6)		(251.6)
Stock compensation expense	29.9	29.9			19.9	$ 19.9
Stockholders' Equity, Other	(0.4)	$ (0.4)			0.1	$ 0.1
Ending balance (in shares) at Dec. 31, 2018		255,326,252				1
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	(37.5)	3,960.7	$ 2,737.6	1,260.6	(37.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9	15.7	359.1		343.4	15.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		111,849
Issuance of stock compensation and reinvested dividends, net of tax withholding	(2.4)	$ (2.4)
Dividends declared on common stock	(462.5)		(462.5)		(110.0)		(110.0)
Stock compensation expense	16.3	$ 16.3
Consolidation of noncontrolling interests	3.8			3.8	3.8			3.8
Distributions to shareholders of noncontrolling interests	(8.6)			(8.6)	(8.6)			(8.6)
Ending balance (in shares) at Dec. 31, 2019		226,641,443				1
Ending balance at Dec. 31, 2019	8,545.3	$ 7,070.4	1,551.5	(26.6)	4,205.0	$ 2,737.6	1,494.0	(26.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	630.0		618.3	11.7	235.8		224.1	11.7
Issuance of stock compensation and reinvested dividends, net of tax withholding (in shares)		195,227
Issuance of stock compensation and reinvested dividends, net of tax withholding	(5.9)	$ (5.9)
Dividends declared on common stock	(465.0)		(465.0)		(160.0)		(160.0)
Stock compensation expense	16.0	16.0
Stockholders' Equity, Other	(0.5)	$ (0.5)
Ending balance (in shares) at Dec. 31, 2020		226,836,670				1
Ending balance at Dec. 31, 2020	$ 8,718.5	$ 7,080.0	$ 1,702.8	$ (14.9)	$ 4,280.8	$ 2,737.6	$ 1,558.1	$ (14.9)

Consolidated Statements of Comprehensive Income - Evergy Metro, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING REVENUES	$ 4,913.4	$ 5,147.8	$ 4,275.9
OPERATING EXPENSES:
Fuel and purchased power	1,099.0	1,265.0	1,078.7
Operating and maintenance	1,163.0	1,218.5	1,115.8
Depreciation and amortization	880.1	861.7	618.8
Taxes other than income tax	364.2	365.5	269.1
Total Operating Expenses	3,769.5	3,962.0	3,342.3
INCOME FROM OPERATIONS	1,143.9	1,185.8	933.6
OTHER INCOME (EXPENSE):
Investment earnings	10.8	11.0	8.8
Other income	31.3	26.9	15.5
Other expense	(78.2)	(76.9)	(78.7)
Total Other Expense, Net	(36.1)	(39.0)	(54.4)
Interest expense	383.9	374.0	279.6
INCOME BEFORE INCOME TAXES	723.9	772.8	599.6
Interest expense	102.2	97.0	59.0
Net income attributable to Evergy, Inc.	618.3	669.9	535.8
Derivative hedging activity
Reclassification to expenses, net of tax	3.0	1.5	0.0
Derivative hedging activity, net of tax	3.0	(46.4)	(4.0)
Total other comprehensive income (loss)	0.6	(47.0)	(3.0)
COMPREHENSIVE INCOME	618.9	622.9	532.8
Evergy Metro
OPERATING REVENUES	1,705.6	1,806.5	1,823.1
OPERATING EXPENSES:
Fuel and purchased power	416.1	482.1	520.6
Operating and maintenance	407.5	451.9	494.2
Depreciation and amortization	326.1	318.4	281.3
Taxes other than income tax	121.6	127.6	117.2
Total Operating Expenses	1,271.3	1,380.0	1,413.3
INCOME FROM OPERATIONS	434.3	426.5	409.8
OTHER INCOME (EXPENSE):
Investment earnings	1.4	2.4	2.8
Other income	9.2	3.2	2.2
Other expense	(25.5)	(21.4)	(30.9)
Total Other Expense, Net	(14.9)	(15.8)	(25.9)
Interest expense	113.6	119.8	133.7
INCOME BEFORE INCOME TAXES	305.8	290.9	250.2
Interest expense	7.1	35.7	87.3
Net income attributable to Evergy, Inc.	298.7	255.2	162.9
Derivative hedging activity
Reclassification to expenses, net of tax	(0.2)	0.7	3.7
Derivative hedging activity, net of tax	(0.2)	0.7	3.7
Total other comprehensive income (loss)	(0.2)	0.7	3.7
COMPREHENSIVE INCOME	$ 298.5	$ 255.9	$ 166.6

Consolidated Balance Sheets - Evergy Metro, Inc - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 144.9	$ 23.2
Receivables, net of allowance for credit losses of $8.1 and $4.6, respectively	273.9	228.5
Accounts receivable pledged as collateral	360.0	339.0
Fuel inventory and supplies	504.5	481.6
Income taxes receivable	62.9	85.5
Regulatory assets	206.2	231.7
Total Current Assets	1,624.3	1,467.7
PROPERTY, PLANT AND EQUIPMENT, NET	19,951.0	19,184.4
OTHER ASSETS:
Regulatory assets	1,868.2	1,740.5
Nuclear decommissioning trust fund	652.1	573.2
Other	527.7	511.5
Total Other Assets	5,384.6	5,161.8
TOTAL ASSETS	27,114.8	25,975.9
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
Notes payable and commercial paper	315.0	561.9
Collateralized note payable	360.0	339.0
Accounts payable	654.0	528.8
Accrued taxes	143.8	145.1
Accrued interest	123.4	122.3
Regulatory liabilities	26.1	63.3
Asset retirement obligations	40.2	71.3
Accrued compensation and benefits	55.5	59.2
Other	182.6	161.6
Total Current Liabilities	2,355.8	2,335.9
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Deferred income taxes	1,664.8	1,744.4
Unamortized investment tax credits	186.7	375.4
Regulatory liabilities	2,638.8	2,248.3
Pension and post-retirement liability	1,149.4	1,017.6
Asset retirement obligations	901.7	602.8
Other	308.2	340.7
Total Long-Term Liabilities	16,040.5	15,094.7
Commitments and Contingencies (Note 15)
EQUITY:
Common stock	7,080.0	7,070.4
Retained earnings	1,702.8	1,551.5
Accumulated other comprehensive loss	(49.4)	(50.0)
Total Evergy, Inc. Shareholders' Equity	8,733.4	8,571.9
TOTAL LIABILITIES AND EQUITY	27,114.8	25,975.9
Evergy Metro
CURRENT ASSETS:
Cash and cash equivalents	71.6	2.0
Receivables, net of allowance for credit losses of $8.1 and $4.6, respectively	45.0	48.1
Related party receivables	225.6	93.9
Accounts receivable pledged as collateral	130.0	118.0
Fuel inventory and supplies	170.4	163.0
Income taxes receivable	3.2	8.7
Regulatory assets	82.0	95.4
Prepaid expenses	22.9	22.8
Other assets	14.2	15.0
Total Current Assets	764.9	566.9
PROPERTY, PLANT AND EQUIPMENT, NET	7,141.2	6,839.0
OTHER ASSETS:
Regulatory assets	533.5	464.4
Nuclear decommissioning trust fund	342.3	300.7
Other	133.9	134.1
Total Other Assets	1,009.7	899.2
TOTAL ASSETS	8,915.8	8,305.1
CURRENT LIABILITIES:
Current maturities of long-term debt	0.0	0.0
Notes payable and commercial paper	0.0	199.3
Collateralized note payable	130.0	118.0
Accounts payable	280.1	233.6
Related party payables	0.1	4.6
Accrued taxes	34.9	38.8
Accrued interest	30.0	26.7
Regulatory liabilities	8.0	11.4
Asset retirement obligations	21.2	36.1
Accrued compensation and benefits	44.4	45.1
Other	37.3	34.0
Total Current Liabilities	586.0	747.6
LONG-TERM LIABILITIES:
Long-term debt, net	2,923.0	2,525.0
Deferred income taxes	558.8	642.8
Unamortized investment tax credits	118.5	119.6
Regulatory liabilities	899.4	792.2
Pension and post-retirement liability	565.1	499.7
Asset retirement obligations	357.7	217.5
Other	148.1	180.0
Total Long-Term Liabilities	5,570.6	4,976.8
Commitments and Contingencies (Note 15)
EQUITY:
Common stock	1,563.1	1,563.1
Retained earnings	1,191.5	1,012.8
Accumulated other comprehensive loss	4.6	4.8
Total Evergy, Inc. Shareholders' Equity	2,759.2	2,580.7
TOTAL LIABILITIES AND EQUITY	$ 8,915.8	$ 8,305.1

Consolidated Balance Sheets - Evergy Metro, Inc (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Allowance for credit losses	$ 19.3	$ 10.5
Common stock - shares authorized (in shares)	600,000,000	600,000,000
Common stock - shares issued (in shares)	226,836,670	226,641,443
Evergy Metro
Allowance for credit losses	$ 8.1	$ 4.6
Common stock - shares authorized (in shares)	1,000	1,000
Common stock - shares issued (in shares)	1	1

Consolidated Statements of Cash Flows - Evergy Metro, Inc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	$ 630.0	$ 685.6	$ 546.0
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	880.1	861.7	618.8
Amortization of nuclear fuel	58.3	51.4	43.6
Amortization of deferred refueling outage	25.4	25.5	21.2
Net deferred income taxes and credits	126.9	121.5	124.2
Allowance for equity funds used during construction	(17.2)	(2.2)	(3.1)
Payments for asset retirement obligations	(18.4)	(17.8)	(22.4)
Other	0.8	(3.2)	(5.2)
Changes in working capital items:
Accounts receivable	(4.9)	(23.1)	265.1
Accounts receivable pledged as collateral	(21.0)	26.0	(185.0)
Fuel inventory and supplies	(22.3)	29.9	54.7
Prepaid expenses and other current assets	16.9	43.4	(128.1)
Accounts payable	134.3	16.9	56.7
Accrued taxes	6.7	(8.2)	(76.4)
Other current liabilities	(98.9)	(59.4)	92.0
Changes in other assets	119.5	79.8	66.8
Changes in other liabilities	(82.0)	(75.5)	(15.9)
Cash Flows from Operating Activities	1,753.8	1,749.0	1,497.8
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(1,560.3)	(1,210.1)	(1,069.7)
Purchase of securities - trusts	(65.6)	(55.8)	(117.5)
Sale of securities - trusts	56.5	47.3	117.7
Other investing activities	(11.1)	(5.1)	(17.6)
Cash Flows from (used in) Investing Activities	(1,533.7)	(1,080.3)	197.4
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net	(246.9)	(176.7)	(104.0)
Collateralized short-term debt, net	21.0	(26.0)	185.0
Proceeds from long-term debt	888.8	2,372.7	290.9
Retirements of long-term debt	(251.1)	(701.1)	(395.8)
Cash dividends paid	(465.0)	(462.5)	(475.0)
Other financing activities	(13.6)	(6.7)	(21.3)
Cash Flows from (used in) Financing Activities	(98.4)	(805.8)	(1,538.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	121.7	(137.1)	156.8
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	23.2	160.3	3.5
End of period	144.9	23.2	160.3
Evergy Metro
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income	298.7	255.2	162.9
Adjustments to reconcile income to net cash from operating activities:
Depreciation and amortization	326.1	318.4	281.3
Amortization of nuclear fuel	29.5	25.9	26.2
Amortization of deferred refueling outage	12.7	12.8	13.5
Net deferred income taxes and credits	(3.5)	(30.6)	48.6
Allowance for equity funds used during construction	(8.0)	(2.2)	(1.4)
Payments for asset retirement obligations	(7.5)	(2.5)	(13.1)
Other	(0.4)	0.3	3.9
Changes in working capital items:
Accounts receivable	(13.2)	37.0	36.5
Accounts receivable pledged as collateral	(12.0)	12.0	0.0
Fuel inventory and supplies	(7.4)	14.6	19.4
Prepaid expenses and other current assets	(7.9)	28.0	7.2
Accounts payable	24.6	9.1	(34.6)
Accrued taxes	1.6	(9.6)	16.1
Other current liabilities	2.4	(53.2)	10.4
Changes in other assets	59.1	33.7	42.9
Changes in other liabilities	(47.3)	(34.7)	37.9
Cash Flows from Operating Activities	647.5	614.2	657.7
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Additions to property, plant and equipment	(565.4)	(445.0)	(430.7)
Purchase of securities - trusts	(45.4)	(34.0)	(35.1)
Sale of securities - trusts	37.9	25.7	27.1
Net money pool lending	(100.0)	0.0	0.0
Other investing activities	4.6	9.0	4.8
Cash Flows from (used in) Investing Activities	(668.3)	(444.3)	(433.9)
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net	(199.3)	22.4	8.0
Collateralized short-term debt, net	12.0	(12.0)	0.0
Proceeds from long-term debt	396.2	393.2	465.6
Retirements of long-term debt	0.0	(400.0)	(519.9)
Cash dividends paid	(120.0)	(175.0)	(180.0)
Other financing activities	1.5	0.9	2.9
Cash Flows from (used in) Financing Activities	90.4	(170.5)	(223.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	69.6	(0.6)	0.4
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Beginning of period	2.0	2.6	2.2
End of period	$ 71.6	$ 2.0	$ 2.6

Consolidated Statements of Changes in Equity - Evergy Metro, Inc - USD ($) $ in Millions	Total	Common Stock	Retained earnings	Evergy Metro	Evergy Metro Common Stock	Evergy Metro Retained earnings	Evergy Metro AOCI - Net gains (losses) on cash flow hedges
Beginning balance (in shares) at Dec. 31, 2017		142,094,275			1
Beginning balance at Dec. 31, 2017	$ 3,860.4	$ 2,734.8	$ 1,173.3	$ 2,513.2	$ 1,563.1	$ 949.7	$ 0.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	546.0		535.8	162.9		162.9
Dividends declared on common stock	(362.1)		(362.1)	(180.0)		(180.0)
Derivative hedging activity, net of tax	(4.0)			3.7			3.7
Ending balance (in shares) at Dec. 31, 2018		255,326,252			1
Ending balance at Dec. 31, 2018	9,990.7	$ 8,685.2	1,346.0	2,499.8	$ 1,563.1	932.6	4.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	685.6		669.9	255.2		255.2
Dividends declared on common stock	(462.5)		(462.5)	(175.0)		(175.0)
Derivative hedging activity, net of tax	(46.4)			0.7			0.7
Ending balance (in shares) at Dec. 31, 2019		226,641,443			1
Ending balance at Dec. 31, 2019	8,545.3	$ 7,070.4	1,551.5	2,580.7	$ 1,563.1	1,012.8	4.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	630.0		618.3	298.7		298.7
Dividends declared on common stock	(465.0)		(465.0)	(120.0)		(120.0)
Derivative hedging activity, net of tax	3.0			(0.2)			(0.2)
Ending balance (in shares) at Dec. 31, 2020		226,836,670			1
Ending balance at Dec. 31, 2020	$ 8,718.5	$ 7,080.0	$ 1,702.8	$ 2,759.2	$ 1,563.1	$ 1,191.5	$ 4.6

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Organization

Evergy is a public utility holding company incorporated in 2017 and headquartered in Kansas City, Missouri. Evergy operates primarily through the following wholly-owned direct subsidiaries listed below.

•Evergy Kansas Central, Inc. (Evergy Kansas Central) is an integrated, regulated electric utility that provides electricity to customers in the state of Kansas. Evergy Kansas Central has one active wholly-owned subsidiary with significant operations, Evergy Kansas South, Inc. (Evergy Kansas South).

•Evergy Metro, Inc. (Evergy Metro) is an integrated, regulated electric utility that provides electricity to customers in the states of Missouri and Kansas.

•Evergy Missouri West, Inc. (Evergy Missouri West) is an integrated, regulated electric utility that provides electricity to customers in the state of Missouri.

•Evergy Transmission Company, LLC (Evergy Transmission Company) owns 13.5% of Transource Energy, LLC (Transource) with the remaining 86.5% owned by AEP Transmission Holding Company, LLC, a subsidiary of American Electric Power Company, Inc. (AEP). Transource is focused on the development of competitive electric transmission projects. Evergy Transmission Company accounts for its investment in Transource under the equity method.

Evergy Kansas Central also owns a 50% interest in Prairie Wind Transmission, LLC (Prairie Wind), which is a joint venture between Evergy Kansas Central and subsidiaries of AEP and Berkshire Hathaway Energy Company. Prairie Wind owns a 108-mile, 345 kV double-circuit transmission line that provides transmission service in the Southwest Power Pool, Inc. (SPP). Evergy Kansas Central accounts for its investment in Prairie Wind under the equity method.

Evergy Kansas Central, Evergy Kansas South, Evergy Metro and Evergy Missouri West conduct business in their respective service territories using the name Evergy. Collectively, the Evergy Companies have approximately 15,400 MWs of owned generating capacity and renewable power purchase agreements and engage in the generation, transmission, distribution and sale of electricity to approximately 1.6 million customers in the states of Kansas and Missouri.

Evergy was incorporated in 2017 as Monarch Energy Holding, Inc. (Monarch Energy), a wholly-owned subsidiary of Great Plains Energy Incorporated (Great Plains Energy). Prior to the closing of the merger transactions described below, Monarch Energy changed its name to Evergy and did not conduct any business activities other than those required for its formation and matters contemplated by the Amended and Restated Agreement and Plan of Merger, dated as of July 9, 2017, by and among Great Plains Energy, Evergy Kansas Central, Monarch Energy and King Energy, Inc. (King Energy), a wholly-owned subsidiary of Monarch Energy (Amended Merger Agreement). On June 4, 2018, in accordance with the Amended Merger Agreement, Great Plains Energy merged into Evergy, with Evergy surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central

surviving the merger. These merger transactions resulted in Evergy becoming the parent entity of Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West. See Note 2 for additional information regarding the merger.

Principles of Consolidation

Evergy Kansas Central was determined to be the accounting acquirer in the merger and thus, the predecessor of Evergy. Evergy had separate operations for the period beginning with the quarter ended June 30, 2018, and references to amounts for periods after the closing of the merger relate to Evergy. The results of Great Plains Energy's direct subsidiaries have been included in Evergy's results of operations from the date of the closing of the merger and thereafter.

Evergy Metro elected not to apply "push-down accounting" related to the merger, whereby the adjustments of assets and liabilities to fair value and the resulting goodwill would be recorded on the financial statements of the acquired subsidiary. These adjustments for Evergy Metro, as well as those related to the acquired assets and liabilities of Great Plains Energy and its other direct subsidiaries, are only reflected on Evergy's consolidated financial statements.

Each of Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements includes the accounts of their subsidiaries and variable interest entities (VIEs) of which they are the primary beneficiary. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany transactions have been eliminated. The Evergy Companies assess financial performance and allocate resources on a consolidated basis (i.e., operate in one segment).

Use of Estimates

The process of preparing financial statements in conformity with generally accepted accounting principles (GAAP) requires the use of estimates and assumptions that affect the reported amounts of certain types of assets, liabilities, revenues and expenses. Such estimates primarily relate to unsettled transactions and events as of the date of the financial statements. Accordingly, upon settlement, actual results may differ from estimated amounts.

Cash and Cash Equivalents

Cash equivalents consist of highly liquid investments with original maturities of three months or less at acquisition.

Fuel Inventory and Supplies

The Evergy Companies record fuel inventory and supplies at average cost. The following table separately states the balances for fuel inventory and supplies.


	December 31
	2020		2019
Evergy	(millions)
Fuel inventory	$	145.0	$	146.4
Supplies	359.5		335.2
Fuel inventory and supplies	$	504.5	$	481.6
Evergy Kansas Central
Fuel inventory	$	79.3	$	80.2
Supplies	197.1		186.2
Fuel inventory and supplies	$	276.4	$	266.4
Evergy Metro
Fuel inventory	$	44.9	$	46.1
Supplies	125.5		116.9
Fuel inventory and supplies	$	170.4	$	163.0

Property, Plant and Equipment

The Evergy Companies record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. AFUDC equity funds are included as a non-cash item in other income and AFUDC borrowed funds are a reduction of interest expense. AFUDC is computed by applying a composite rate to qualified construction work in progress. The rates used to compute gross AFUDC are compounded semi-annually.

The amounts of the Evergy Companies' AFUDC for borrowed and equity funds are detailed in the following table.


	2020		2019		2018
Evergy	(millions)
AFUDC borrowed funds	$	16.5	$	14.5	$	10.4
AFUDC equity funds	17.2		2.2		3.1
Total	$	33.7	$	16.7	$	13.5
Evergy Kansas Central
AFUDC borrowed funds	$	8.5	$	7.5	$	6.6
AFUDC equity funds	9.1		—		2.9
Total	$	17.6	$	7.5	$	9.5
Evergy Metro(a)
AFUDC borrowed funds	$	6.0	$	4.3	$	4.9
AFUDC equity funds	8.0		2.2		1.4
Total	$	14.0	$	6.5	$	6.3

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

The average rates used in the calculation of AFUDC are detailed in the following table.


	2020	2019	2018
Evergy Kansas Central	4.7%	3.0%	3.3%
Evergy Metro	5.2%	4.6%	3.9%
Evergy Missouri West	3.5%	3.7%	2.9%

When property units are retired or otherwise disposed, the original cost, net of salvage, is charged to accumulated depreciation. Repair of property and replacement of items not considered to be units of property are expensed as incurred, except for planned refueling and maintenance outages at Wolf Creek Generating Station (Wolf Creek). As authorized by regulators, the incremental maintenance cost incurred for such outages is deferred and amortized to expense ratably over the period between planned outages.

Depreciation and Amortization

Depreciation and amortization of utility plant other than nuclear fuel is computed using the straight-line method over the estimated lives of depreciable property based on rates approved by state regulatory authorities. Annual depreciation rates average approximately 3%. See Note 8 for more details. Nuclear fuel is amortized to fuel expense based on the quantity of heat produced during the generation of electricity.

The depreciable lives of Evergy's, Evergy Kansas Central's and Evergy Metro's property, plant and equipment are detailed in the following table.


	Evergy			Evergy Kansas Central				Evergy Metro
	(years)
Generating facilities	8	to	87		8	to	87	20	to	60
Transmission facilities	15	to	94		36	to	94	15	to	70
Distribution facilities	8	to	73		19	to	73	8	to	55
Other	5	to	84		7	to	84	5	to	50

Plant to be Retired, Net

When the Evergy Companies retire utility plant, the original cost, net of salvage, is charged to accumulated depreciation. However, when it becomes probable an asset will be retired significantly in advance of its original expected useful life and in the near term, the cost of the asset and related accumulated depreciation is recognized as a separate asset and a probable abandonment. If the asset is still in service, the net amount is classified as plant to be retired, net on the consolidated balance sheets. If the asset is no longer in service, the net amount is classified as a regulatory asset on the consolidated balance sheets.

The Evergy Companies must also assess the probability of full recovery of the remaining net book value of the abandonment. The net book value that may be retained as an asset on the balance sheet for the abandonment is dependent upon amounts that may be recovered through regulated rates, including any return. An impairment charge, if any, would equal the difference between the remaining net book value of the asset and the present value of the future revenues expected from the asset.

Evergy Missouri West has determined that its November 2018 retirement of Sibley No. 3 Unit meets the criteria to be considered an abandonment. As of December 31, 2020, Evergy has classified the remaining Sibley No. 3 Unit net book value of $128.4 million as retired generation facilities within regulatory assets on its consolidated balance sheet. This regulatory asset is reduced by approximately $9 million of annual amortization expense, which is an amount equal to the annual depreciation expense for the asset reflected in retail rates.

In October 2019, the Missouri Public Service Commission (MPSC) granted the request of certain intervenors for an Accounting Authority Order (AAO) that requires Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes and all other costs associated with Sibley Station following the station's retirement in November 2018 for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than the end of 2022. See Note 5 for additional information regarding the AAO.

Evergy Missouri West expects that the MPSC's decision in its next rate case regarding the AAO could impact the valuation of its regulatory asset for retired generation facilities but as of December 31, 2020, has concluded that no impairment is required based on the relevant facts and circumstances.

Nuclear Plant Decommissioning Costs

Nuclear plant decommissioning cost estimates are based on either the immediate dismantlement method or the deferred dismantling method as determined by the State Corporation Commission of the State of Kansas (KCC) and MPSC and include the costs of decontamination, dismantlement and site restoration. Based on these cost estimates, Evergy Kansas Central and Evergy Metro each contribute to a tax-qualified trust fund to be used to decommission Wolf Creek. Related liabilities for decommissioning are included on Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated balance sheets in asset retirement obligations (AROs).

As a result of the authorized regulatory treatment and related regulatory accounting, differences between the decommissioning trust fund asset and the related ARO are recorded as a regulatory asset or liability. See Note 7 for discussion of AROs including those associated with nuclear plant decommissioning costs.

Regulatory Accounting

Accounting standards are applied that recognize the economic effects of rate regulation. Accordingly, regulatory assets and liabilities have been recorded when required by a regulatory order or based on regulatory precedent. See Note 5 for additional information concerning regulatory matters.

Cash Surrender Value of Life Insurance

Amounts related to corporate-owned life insurance (COLI) are recorded on the consolidated balance sheets in other long-terms assets and are detailed in the following table for Evergy. Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity.


	December 31
	2020		2019
Evergy	(millions)
Cash surrender value of policies	$	1,369.6	$	1,370.0
Borrowings against policies	(1,237.6)		(1,237.1)
Corporate-owned life insurance, net	$	132.0	$	132.9

Increases in cash surrender value and death benefits are recorded in other income in the Evergy Companies' consolidated statements of income and comprehensive income. Interest expense incurred on policy loans is offset against the policy income. Income from death benefits is highly variable from period to period.

Fair Value of Financial Instruments

The following methods and assumptions were used to estimate the fair value of the following financial instruments for which it was practicable to estimate that value.

Nuclear decommissioning trust fund - The Evergy Companies' nuclear decommissioning trust fund assets are recorded at fair value based on quoted market prices of the investments held by the fund and/or valuation models.

Pension plans - For financial reporting purposes, the market value of plan assets is the fair value based on quoted market prices of the investments held by the fund and/or valuation models.

Revenue Recognition

The Evergy Companies recognize revenue on the sale of electricity to customers over time as the service is provided in the amount they have the right to invoice. Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates. The Evergy Companies' unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. See Note 4 for the balance of unbilled receivables for each of Evergy, Evergy Kansas Central and Evergy Metro as of December 31, 2020 and 2019.

The Evergy Companies also collect sales taxes and franchise fees from customers concurrent with revenue-producing activities that are levied by state and local governments. These items are excluded from revenue, and thus are not reflected on the consolidated statements of income and comprehensive income for Evergy, Evergy Kansas Central and Evergy Metro.

See Note 3 for additional details regarding revenue recognition from sales of electricity by the Evergy Companies.

Allowance for Credit Losses

Historical loss information generally provides the basis for the Evergy Companies' assessment of expected credit losses. The Evergy Companies use an aging of accounts receivable method to assess historical loss information. When historical experience may not fully reflect the Evergy Companies' expectations about the future, the Evergy Companies will adjust historical loss information, as necessary, to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information.

Receivables are charged off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment.

Property Gains and Losses

Net gains and losses from the sale of assets and businesses and from asset impairments are recorded in operating expenses.

Asset Impairments

Long-lived assets and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If the sum of the undiscounted expected future cash flows from an asset to be held and used is less than the carrying value of the asset, an asset impairment must be recognized in the financial statements. The amount of impairment recognized is the excess of the carrying value of the asset over its fair value.

Goodwill and indefinite lived intangible assets are tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. The annual test must be performed at the same time each year. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value. See Note 6 for additional details on goodwill.

Income Taxes

Income taxes are accounted for using the asset/liability approach. Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized.

The Evergy Companies recognize tax benefits based on a "more-likely-than-not" recognition threshold. In addition, the Evergy Companies recognize interest accrued related to unrecognized tax benefits in interest expense and penalties in operating expenses.

Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. Evergy Kansas Central's and Evergy Metro's income tax provisions include taxes allocated based on their separate company's income or loss.

The Evergy Companies have established a net regulatory liability for future refunds to be made to customers for amounts collected from customers in excess of income taxes in current rates. Tax credits are recognized in the year

generated except for certain Evergy Kansas Central, Evergy Metro and Evergy Missouri West investment tax credits that have been deferred and amortized over the remaining service lives of the related properties.

Other Income (Expense), Net

The table below shows the detail of other expense for each of the Evergy Companies.


	2020		2019		2018
Evergy	(millions)
Non-service cost component of net benefit cost	$	(58.6)	$	(55.6)	$	(47.8)
Other	(19.6)		(21.3)		(30.9)
Other expense	$	(78.2)	$	(76.9)	$	(78.7)
Evergy Kansas Central
Non-service cost component of net benefit cost	$	(21.2)	$	(20.1)	$	(23.5)
Other	(17.7)		(20.0)		(23.3)
Other expense	$	(38.9)	$	(40.1)	$	(46.8)
Evergy Metro(a)
Non-service cost component of net benefit cost	$	(24.2)	$	(20.9)	$	(25.9)
Other	(1.3)		(0.5)		(5.0)
Other expense	$	(25.5)	$	(21.4)	$	(30.9)

(a) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Earnings Per Share

To compute basic earnings per share (EPS), Evergy divides net income attributable to Evergy, Inc. by the weighted average number of common shares outstanding. Diluted EPS includes the effect of issuable common shares resulting from restricted share units (RSUs), performance shares and restricted stock. Evergy computes the dilutive effects of potential issuances of common shares using the treasury stock method.

The following table reconciles Evergy's basic and diluted EPS.


	2020		2019		2018
Income	(millions, except per share amounts)
Net income	$	630.0	$	685.6	$	546.0
Less: Net income attributable to noncontrolling interests	11.7		15.7		10.2
Net income attributable to Evergy, Inc.	$	618.3	$	669.9	$	535.8
Common Shares Outstanding
Weighted average number of common shares outstanding - basic	227.2		239.5		213.9
Add: effect of dilutive securities	0.3		0.4		0.2
Diluted average number of common shares outstanding	227.5		239.9		214.1
Basic EPS	$	2.72	$	2.80	$	2.50
Diluted EPS	$	2.72	$	2.79	$	2.50

Anti-dilutive shares excluded from the computation of diluted EPS for 2020 and 2019 were 127,884 RSUs and 785 RSUs, respectively. There were no anti-dilutive securities excluded from the computation of diluted EPS for 2018.

Supplemental Cash Flow Information


Year Ended December 31	2020		2019		2018
Evergy	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	367.6	$	329.5	$	255.9
Interest of VIEs	0.8		1.6		2.3
Income taxes, net of refunds	(46.5)		(5.2)		(0.9)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	463.3		186.0		(7.8)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	0.9		(0.3)		0.5


Year Ended December 31	2020		2019		2018
Evergy Kansas Central	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	157.5	$	143.0	$	155.3
Interest of VIEs	0.8		1.6		2.3
Income taxes, net of refunds	4.7		29.9		37.5
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	235.4		92.1		(32.5)


Year Ended December 31	2020		2019		2018
Evergy Metro(a)	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	109.9	$	118.4	$	129.4
Income taxes, net of refunds	4.8		77.0		31.2
Non-cash investing transactions:
Property, plant and equipment additions	192.5		80.7		19.2

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Non-cash property, plant and equipment additions in 2020 for Evergy, Evergy Kansas Central and Evergy Metro include a non-cash addition related to the revision in estimate of the Wolf Creek ARO liability in the third quarter of 2020. See Note 7 for more details.

See Note 2 for the non-cash information related to the merger transaction in 2018, including the fair value of Great Plains Energy's assets acquired and liabilities assumed and the issuance of Evergy common stock.

Dividends Declared

In February 2021, Evergy's Board of Directors (Evergy Board) declared a quarterly dividend of $0.535 per share on Evergy's common stock. The common dividend is payable March 22, 2021, to shareholders of record as of March 8, 2021.

Recently Adopted Accounting Standards

Leases

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases, which requires an entity that is a lessee to record a right-of-use asset and a lease liability for lease payments on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Lessor accounting remains largely unchanged. In January 2018, the FASB issued ASU No. 2018-01, Leases: Land

Easement Practical Expedient for Transition to Topic 842, which permits entities to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU No. 2016-02. Also in July 2018, the FASB issued ASU No. 2018-11, Leases: Targeted Improvements, which provides an optional transition method that allows entities to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. In December 2018, the FASB issued ASU No. 2018-20, Leases: Narrow-Scope Improvements for Lessors, which is expected to reduce a lessor's implementation and ongoing costs associated with applying ASU No. 2016-02. In March 2019, the FASB issued ASU No. 2019-01, Leases: Codification Improvements, which clarifies certain lessor accounting and interim reporting requirements. ASU No. 2016-02 and the subsequent amendments are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted, and requires a modified retrospective transition approach with an option to either adjust or not adjust comparative periods.

The Evergy Companies adopted the new guidance on January 1, 2019, without adjusting comparative periods for all leases existing as of January 1, 2019, by electing the optional transition method permitted by ASU No. 2018-11. As a result, Evergy, Evergy Kansas Central and Evergy Metro recorded an increase to assets and liabilities of approximately $110 million, $40 million and $80 million, respectively, as of January 1, 2019. Evergy Kansas Central and Evergy Metro have certain lease transactions between them for which the related assets and liabilities are eliminated at consolidated Evergy. The adoption of Topic 842 did not have a material impact on the Evergy Companies consolidated statements of income and comprehensive income and there was no cumulative-effect adjustment recorded to the opening balance of retained earnings. The Evergy Companies also elected a practical expedient to forgo reassessing existing or expired contracts as leases to determine whether each is in scope of Topic 842 and to forgo reassessing lease classification for existing and expired leases.

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL

Description of Merger Transaction

On June 4, 2018, Evergy completed the mergers contemplated by the Amended Merger Agreement. As a result of the mergers, Great Plains Energy merged into Evergy, with Evergy surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central surviving the merger. Following the completion of these mergers, Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West, became wholly-owned subsidiaries of Evergy.

The merger was structured as a merger of equals in a tax-free exchange of shares that involved no premium paid or received with respect to either Great Plains Energy or Evergy Kansas Central. As a result of the closing of the merger transaction, each outstanding share of Great Plains Energy common stock was converted into 0.5981 shares of Evergy common stock and each outstanding share of Evergy Kansas Central common stock was converted into 1 share of Evergy common stock.

Accounting Charges and Deferrals Related to the Merger

The following pre-tax reductions of revenue, expenses and deferral were recognized following the consummation of the merger and are included in the Evergy Companies' consolidated statements of income and comprehensive income for 2018.


Description	Income Statement Line Item	Expected Payment Period	Evergy		Evergy Kansas Central		Evergy Metro
			(millions)
One-time bill credits	Operating revenues	2018 - 2019	$	(59.7)	$	(23.1)	$	(22.4)
Annual bill credits	Operating revenues	2019 - 2022	(10.5)		(7.9)		(2.6)
Total impact to operating revenues			$	(70.2)	$	(31.0)	$	(25.0)

Charitable contributions and community support	Operating and maintenance	2018 - 2027	$	24.7	$	—	$	—
Voluntary severance and accelerated equity compensation	Operating and maintenance	2018 - 2019	47.9		44.2		2.6
Other transaction and transition costs	Operating and maintenance	2018	51.0		21.5		2.1
Reallocation and deferral of merger transition costs	Operating and maintenance	n/a	(47.8)		(13.8)		(23.2)
Total impact to operating and maintenance expense			$	75.8	$	51.9	$	(18.5)
Total			$	(146.0)	$	(82.9)	$	(6.5)

Reductions of revenue related to customer bill credits and expenses related to charitable contributions and community support were incurred as a result of conditions in the MPSC and KCC merger orders and were recorded as liabilities in the amounts presented above following the consummation of the merger. Reductions of revenue for annual bill credits for Evergy Kansas Central's and Evergy Metro's Kansas electric retail customers are recognized ratably in the twelve-month period preceding their payment.

Voluntary severance and accelerated equity compensation represent costs related to payments for voluntary severance and change in control plans, as well as the recording of unrecognized equity compensation costs and the incremental fair value associated with the vesting of outstanding Evergy Kansas Central equity compensation awards upon the consummation of the merger.

Other transaction and transition costs include merger success fees and fees for other outside services incurred.

Reallocation and deferral of merger transition costs represents the net reallocation of incurred merger transition costs between Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West and the subsequent deferral of these transition costs to a regulatory asset for future recovery in accordance with the KCC and MPSC merger orders.

Purchase Price

Based on an evaluation of the provisions of ASC 805, Business Combinations, Evergy Kansas Central was determined to be the accounting acquirer in the merger. Pursuant to the Amended Merger Agreement, Great Plains Energy's common stock shares were exchanged for Evergy common stock shares at the fixed exchange rate of 0.5981. The total consideration transferred in the merger is based on the closing stock price of Evergy Kansas Central on June 4, 2018, and is calculated as follows.


	(millions, except share amounts)
Great Plains Energy common stock shares outstanding as of June 4, 2018	215,800,074
Great Plains Energy restricted stock awards outstanding as of June 4, 2018	(204,825)
Great Plains Energy shares to be converted to Evergy shares	215,595,249
Exchange ratio	0.5981
Evergy common stock shares issued to Great Plains Energy shareholders	128,947,518
Closing price of Evergy Kansas Central common stock as of June 4, 2018	$	54.00
Fair value of Evergy shares issued to Great Plains Energy shareholders	$	6,963.2
Fair value of Great Plains Energy's equity compensation awards	12.5
Total purchase price	$	6,975.7

Great Plains Energy's equity compensation awards, including performance shares and restricted stock, were replaced by equivalent Evergy equity compensation awards subject to substantially the same terms and conditions upon the closing of the merger. In accordance with the accounting guidance in ASC 805, a portion of the fair value of these awards is attributable to the purchase price as it represents consideration transferred in the merger.

Purchase Price Allocation

The fair value of Great Plains Energy's assets acquired and liabilities assumed as of June 4, 2018, was determined based on significant estimates and assumptions that are judgmental in nature. Third-party valuation specialists were engaged to assist in the valuation of these assets and liabilities.

The significant assets and liabilities recorded at fair values as of the merger date include long-term debt, asset retirement obligations, pension and post-retirement plans, accumulated deferred income tax liabilities and certain other long-term assets and liabilities.

The majority of Great Plains Energy's operations were subject to the rate-setting authority of the MPSC, the KCC and the Federal Energy Regulatory Commission (FERC) and were accounted for pursuant to GAAP, including the accounting guidance for regulated operations. The rate-setting and cost recovery provisions for Great Plains Energy's regulated operations provided revenue derived from costs including a return on investment of assets and liabilities included in rate base. Except for the significant assets and liabilities for which valuation adjustments were made as discussed above, the fair values of Great Plains Energy's tangible and intangible assets and liabilities subject to these rate-setting provisions approximated their carrying values and the assets and liabilities did not reflect any adjustments to these amounts other than for amounts not included in rate base. The difference between the fair value and pre-merger carrying amounts for Great Plains Energy's long-term debt, asset retirement obligations and pension and post-retirement plans that were related to regulated operations were recorded as a regulatory asset or liability. The excess of the purchase price over the estimated fair values of the assets acquired and liabilities assumed were recognized as goodwill as of the merger date.

The final purchase price allocation to Great Plains Energy's assets and liabilities as of June 4, 2018, is detailed in the following table.


	(millions)
Current assets	$	2,151.7
Property, plant and equipment, net	9,179.7
Goodwill	2,336.6
Other long-term assets, excluding goodwill	1,235.9
Total assets	$	14,903.9
Current liabilities	1,673.9
Long-term liabilities, excluding long-term debt	2,895.7
Long-term debt, net	3,358.6
Total liabilities	$	7,928.2
Total purchase price	$	6,975.7

Impact of Merger

The impact of Great Plains Energy's subsidiaries on Evergy's revenues in the consolidated statement of comprehensive income for 2018 was an increase of $1,661.1 million. The impact of Great Plains Energy's subsidiaries on Evergy's net income attributable to Evergy in the consolidated statement of comprehensive income for 2018 was an increase of $236.2 million.

Evergy had incurred total merger-related costs, including reductions of revenue for customer bill credits, of $148.0 million for 2018.

Pro Forma Financial Information

The following unaudited pro forma financial information reflects the consolidated results of operations of Evergy as if the merger transactions had taken place on January 1, 2018. The unaudited pro forma information was calculated after applying Evergy's accounting policies and adjusting Great Plains Energy's results to reflect purchase accounting adjustments.

The unaudited pro forma financial information has been presented for illustrative purposes only and is not necessarily indicative of the consolidated results of operations that would have been achieved or the future consolidated results of operations of Evergy.



		2018
	(millions, except per share amounts)
Operating revenues		$	5,334.6
Net income attributable to Evergy, Inc.		714.3
Basic earnings per common share		$	2.67
Diluted earnings per common share		$	2.67

Evergy, Evergy Kansas Central and Great Plains Energy incurred non-recurring costs and a gain directly related to the merger that have been excluded in the 2018 pro forma earnings presented above. On an after-tax basis, these non-recurring merger-related costs and gain incurred by Evergy, Evergy Kansas Central and Great Plains Energy included:

•$74.7 million of certain after-tax merger-related transition and transaction costs;

•$44.4 million of after-tax reductions in operating revenues related to one-time customer bill credits; and

•$36.6 million of after-tax mark-to-market gains on interest rate swaps for which cash settlement was contingent upon the consummation of the merger.

REVENUE

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

REVENUE

Evergy's, Evergy Kansas Central's and Evergy Metro's revenues disaggregated by customer class are summarized in the following tables.


Evergy	2020		2019		2018
Revenues	(millions)
Residential	$	1,909.2	$	1,908.1	$	1,578.8
Commercial	1,641.7		1,781.6		1,356.4
Industrial	588.7		621.6		527.8
Other retail	38.5		47.1		30.6
Total electric retail	$	4,178.1	$	4,358.4	$	3,493.6
Wholesale	264.0		327.5		404.4
Transmission	318.5		309.2		308.1
Industrial steam and other	21.0		24.5		17.9
Total revenue from contracts with customers	$	4,781.6	$	5,019.6	$	4,224.0
Other	131.8		128.2		51.9
Operating revenues	$	4,913.4	$	5,147.8	$	4,275.9


Evergy Kansas Central	2020		2019		2018
Revenues	(millions)
Residential	$	801.2	$	793.9	$	846.4
Commercial	665.6		709.1		702.8
Industrial	379.9		401.3		396.4
Other retail	17.7		21.0		20.0
Total electric retail	$	1,864.4	$	1,925.3	$	1,965.6
Wholesale	215.4		239.9		346.1
Transmission	287.3		273.3		288.9
Other	2.3		5.8		6.0
Total revenue from contracts with customers	$	2,369.4	$	2,444.3	$	2,606.6
Other	48.7		63.1		8.3
Operating revenues	$	2,418.1	$	2,507.4	$	2,614.9


Evergy Metro(a)	2020		2019		2018
Revenues	(millions)
Residential	$	714.7	$	712.4	$	735.6
Commercial	717.1		786.1		794.8
Industrial	128.8		136.9		138.8
Other retail	11.7		16.3		10.4
Total electric retail	$	1,572.3	$	1,651.7	$	1,679.6
Wholesale	35.0		70.9		53.5
Transmission	13.9		17.5		14.5
Other	2.6		2.8		4.4
Total revenue from contracts with customers	$	1,623.8	$	1,742.9	$	1,752.0
Other	81.8		63.6		71.1
Operating revenues	$	1,705.6	$	1,806.5	$	1,823.1

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Retail Revenues

The Evergy Companies' retail revenues are generated by the regulated sale of electricity to their residential, commercial and industrial customers within their franchised service territories. The Evergy Companies recognize revenue on the sale of electricity to their customers over time as the service is provided in the amount they have a right to invoice. Retail customers are billed monthly at the tariff rates approved by the KCC and MPSC based on customer kWh usage.

Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates.

The Evergy Companies also collect sales taxes and franchise fees from customers concurrent with revenue-producing activities that are levied by state and local governments. These items are excluded from revenue, and thus not reflected on the statements of income and comprehensive income, for Evergy, Evergy Kansas Central and Evergy Metro.

Wholesale Revenues

The Evergy Companies' wholesale revenues are generated by the sale of wholesale power and capacity in circumstances when the power that the Evergy Companies generate is not required for customers in their service territory. These sales primarily occur within the SPP Integrated Marketplace. The Evergy Companies also purchase power from the SPP Integrated Marketplace and record sale and purchase activity on a net basis in wholesale revenue or fuel and purchased power expense. In addition, the Evergy Companies sell wholesale power and capacity through bilateral contracts to other counterparties, such as electric cooperatives, municipalities and other electric utilities.

For both wholesale sales to the SPP Integrated Marketplace and through bilateral contracts, the Evergy Companies recognize revenue on the sale of wholesale electricity to their customers over time as the service is provided in the amount they have a right to invoice.

Wholesale sales within the SPP Integrated Marketplace are billed weekly based on the fixed transaction price determined by the market at the time of the sale and the MWh quantity purchased. Wholesale sales from bilateral contracts are billed monthly based on the contractually determined transaction price and the kWh quantity purchased.

Transmission Revenues

The Evergy Companies' transmission revenues are generated by the use of their transmission networks by the SPP. To enable optimal use of the diverse generating resources in the SPP region, the Evergy Companies, as well as other transmission owners, allow the SPP to access and operate their transmission networks. As new transmission lines are constructed, they are included in the transmission network available to the SPP. In exchange for providing access, the SPP pays the Evergy Companies consideration determined by formula rates approved by FERC, which include the cost to construct and maintain the transmission lines and a return on investment. The price for access to the Evergy Companies' transmission networks are updated annually based on projected costs. Projections are updated to actual costs and the difference is included in subsequent year's prices.

The Evergy Companies have different treatment for their legacy transmission facilities within the SPP, which results in different levels of transmission revenue being received from the SPP. Evergy Kansas Central's transmission revenues from SPP include amounts that Evergy Kansas Central pays to the SPP on behalf of its retail electric customers for the use of Evergy Kansas Central's legacy transmission facilities. These transmission revenues are mostly offset by SPP network transmission cost expense that Evergy Kansas Central pays on behalf of its retail customers. Evergy Metro and Evergy Missouri West do not pay the SPP for their retail customers’ use of the Evergy Metro and Evergy Missouri West legacy transmission facilities and correspondingly, their transmission revenues also do not reflect the associated transmission revenue from the SPP.

The Evergy Companies recognize revenue on the sale of transmission service to their customers over time as the service is provided in the amount they have a right to invoice. Transmission service to the SPP is billed monthly based on a fixed transaction price determined by FERC formula transmission rates along with other SPP-specific charges and the MW quantity purchased.

Industrial Steam and Other Revenues

Evergy's industrial steam and other revenues are primarily generated by the regulated sale of industrial steam to Evergy Missouri West's steam customers. Evergy recognizes revenue on the sale of industrial steam to its customers over time as the service is provided in the amount that it has the right to invoice. Steam customers are billed on a monthly basis at the tariff rate approved by the MPSC based on customer MMBtu usage.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

RECEIVABLES

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

RECEIVABLES

The Evergy Companies' receivables are detailed in the following table.


	December 31
		2020		2019
Evergy		(millions)
Customer accounts receivable - billed		$	5.3	$	7.2
Customer accounts receivable - unbilled		110.0		104.0
Other receivables		177.9		127.8
Allowance for credit losses		(19.3)		(10.5)
Total		$	273.9	$	228.5
Evergy Kansas Central
Customer accounts receivable - billed		$	—	$	—
Customer accounts receivable - unbilled		50.7		49.7
Other receivables		175.7		94.5
Allowance for credit losses		(7.5)		(3.8)
Total		$	218.9	$	140.4
Evergy Metro
Customer accounts receivable - billed		$	3.3	$	3.1
Customer accounts receivable - unbilled		27.9		26.5
Other receivables		21.9		23.1
Allowance for credit losses		(8.1)		(4.6)
Total		$	45.0	$	48.1

The Evergy Companies' other receivables at December 31, 2020 and 2019, consisted primarily of receivables from partners in jointly-owned electric utility plants, wholesale sales receivables and receivables related to alternative revenue programs. The Evergy Companies' other receivables also included receivables from contracts with customers as summarized in the following table.


	December 31
	2020		2019
	(millions)
Evergy	$	57.5	$	42.0
Evergy Kansas Central	49.9		37.7
Evergy Metro	6.9		1.2

The change in the Evergy Companies' allowance for credit losses is summarized in the following table.


	2020		2019
Evergy	(millions)
Beginning balance January 1	$	10.5	$	9.2
Credit loss expense	24.9		27.2
Write-offs	(28.6)		(38.3)
Recoveries of prior write-offs	12.5		12.4
Ending balance December 31	$	19.3	$	10.5
Evergy Kansas Central
Beginning balance January 1	$	3.8	$	3.9
Credit loss expense	11.1		7.2
Write-offs	(10.0)		(10.7)
Recoveries of prior write-offs	2.6		3.4
Ending balance December 31	$	7.5	$	3.8
Evergy Metro
Beginning balance January 1	$	4.6	$	3.8
Credit loss expense	9.0		13.7
Write-offs	(12.4)		(19.2)
Recoveries of prior write-offs	6.9		6.3
Ending balance December 31	$	8.1	$	4.6

Sale of Accounts Receivable

Evergy Kansas Central, Evergy Metro and Evergy Missouri West sell an undivided percentage ownership interest in their retail electric accounts receivable to independent outside investors. These sales are accounted for as secured borrowings with accounts receivable pledged as collateral and a corresponding short-term collateralized note payable recognized on the balance sheets. The Evergy Companies' accounts receivable pledged as collateral and the corresponding short-term collateralized note payable are summarized in the following table.


	December 31
	2020		2019
	(millions)
Evergy	$	360.0	$	339.0
Evergy Kansas Central	180.0		171.0
Evergy Metro	130.0		118.0

Each receivable sale facility expires in September 2021. Evergy Kansas Central's facility allows for $185.0 million in aggregate outstanding principal amount of borrowings from mid-October through mid-June and then $200.0 million from mid-June through the expiration date of the facility. Evergy Metro's facility allows for $130.0 million in aggregate outstanding principal amount of borrowings at any time. Evergy Missouri West's facility allows for $50.0 million in aggregate outstanding principal amount of borrowings from mid-November through mid-June and then $65.0 million from mid-June through the expiration date of the facility.

RATE MATTERS AND REGULATION

12 Months Ended

Dec. 31, 2020

Regulated Operations [Abstract]

RATE MATTERS AND REGULATION

KCC Proceedings

Evergy Kansas Central 2020 Transmission Delivery Charge (TDC)

In March 2020, the KCC issued an order adjusting Evergy Kansas Central's retail prices to include updated transmission costs as reflected in the FERC transmission formula rate (TFR). The new prices were effective in April 2020 and are expected to increase Evergy Kansas Central's annual retail revenues by $3.5 million when compared to 2019.

Evergy Metro 2020 TDC

In April 2020, the KCC issued an order adjusting Evergy Metro's retail prices to include updated transmission costs as reflected in the FERC TFR. The new prices were effective in May 2020 and are expected to decrease Evergy Metro's annual retail revenues by $2.7 million when compared to 2019.

Evergy Kansas Central and Evergy Metro Earnings Review and Sharing Plan (ERSP)

As part of their merger settlement agreement with the KCC, Evergy Kansas Central and Evergy Metro agreed to participate in an ERSP for the years 2019 through 2022. Under the ERSP, Evergy Kansas Central's and Evergy Metro's Kansas jurisdiction are required to refund to customers 50% of annual earnings in excess of their authorized return on equity of 9.3% to the extent the excess earnings exceed the amount of Evergy Kansas Central's and Evergy Metro's annual merger bill credits for the year being measured.

Evergy Kansas Central's and Evergy Metro's 2019 calculations of annual earnings did not exceed their authorized return on equity of 9.3% and therefore did not result in any customer refund obligations. These calculations were filed with the KCC in April 2020. As of December 31, 2020, Evergy Kansas Central and Evergy Metro estimate their 2020 annual earnings will not result in a significant refund obligation. The final refund obligations for 2020, if any, will be decided by the KCC and could vary from the current estimates.

Evergy Kansas Central and Evergy Metro COVID-19 AAO Request

In May 2020, Evergy Kansas Central and Evergy Metro filed a joint request for an AAO with the KCC that would allow for the extraordinary costs and lost revenues incurred by the companies, net of any COVID-19-related savings, as a result of the COVID-19 pandemic to be considered for future recovery from customers as part of their next rate cases.

In July 2020, the KCC granted Evergy Kansas Central's and Evergy Metro's request for an AAO as discussed above. As a result of the KCC's order, Evergy Kansas Central and Evergy Metro will record to a regulatory asset all net incremental costs incurred associated with the COVID-19 pandemic for consideration in their next rate cases, which are expected to be completed no later than the end of 2023. Additionally, the KCC order states that the KCC will also consider granting the recovery of Evergy Kansas Central's and Evergy Metro's lost revenues associated with the COVID-19 pandemic as part of their next rate cases. If granted, these lost revenues would be recognized prospectively as billed to customers in future rates.

MPSC Proceedings

Evergy Missouri West Other Proceedings

In December 2018, the Office of the Public Counsel (OPC) and the Midwest Energy Consumers Group (MECG) filed a petition with the MPSC requesting an AAO that would require Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes, and all other costs associated with Sibley Station following the station’s retirement in November 2018.

In October 2019, the MPSC granted OPC's and MECG's request for an AAO and required Evergy Missouri West to record to a regulatory liability the revenues discussed above for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than the end of 2022. Depending on the MPSC's decision in this next rate case, Evergy Missouri West could be required to refund to customers all or a portion of amounts collected in revenue for Sibley Station since December 2018 or, alternatively, could be required to make no refunds.

As a result of the MPSC order, Evergy has recorded a regulatory liability of $18.4 million as of December 31, 2020 for the estimated amount of revenues that Evergy Missouri West has collected from customers for Sibley Station since December 2018 that Evergy has determined is probable of refund. Evergy expects that it will continue to defer such amounts as collected from customers until new rates become effective in Evergy Missouri West's next rate case.

The accrual for this estimated amount does not include certain revenues collected related to Sibley Station that Evergy has determined to not be probable of refund in the next rate case based on the relevant facts and

circumstances. While Evergy has determined these additional revenues to not be probable of refund, the ultimate resolution of this matter in Evergy Missouri West's next rate case is uncertain and could result in an estimated loss of up to approximately $12 million per year in excess of the amount accrued until Evergy Missouri West's new rates become effective. Evergy's regulatory liability for probable refunds as of December 31, 2020 and estimated loss in excess of the amount accrued represent estimates that could change significantly based on ongoing developments including decisions in other regulatory proceedings that establish precedent applicable to this matter and positions of parties on this issue in a future Evergy Missouri West rate case.

Evergy Metro and Evergy Missouri West COVID-19 AAO Request

In May 2020, Evergy Metro and Evergy Missouri West filed a joint request for an AAO with the MPSC that would allow for the extraordinary costs and lost revenues incurred by the companies, net of any COVID-19-related savings, as a result of the COVID-19 pandemic to be considered for future recovery from customers as part of their next rate cases.

In October 2020, Evergy Metro and Evergy Missouri West entered into a non-unanimous stipulation and agreement with the MPSC staff and other intervenors that would allow Evergy Metro and Evergy Missouri West to defer to a regulatory asset certain net incremental costs incurred associated with the COVID-19 pandemic. The MPSC approved the AAO request in January 2021. As a result of the MPSC's order, Evergy Metro and Evergy Missouri West will record the net incremental costs to a regulatory asset for consideration in their next rate cases, which are expected to be filed in January 2022.

FERC Proceedings

In October of each year, Evergy Kansas Central and Evergy Metro post an updated TFR that includes projected transmission capital expenditures and operating costs for the following year. This rate is the most significant component in the retail rate calculation for Evergy Kansas Central's and Evergy Metro's annual request with the KCC to adjust retail prices to include updated transmission costs through the TDC.

Evergy Kansas Central TFR

In the most recent three years, the updated TFR was expected to adjust Evergy Kansas Central's annual transmission revenues by approximately:

•$32.4 million increase effective in January 2021;

•$6.8 million increase effective in January 2020; and

•$11.2 million decrease effective in January 2019.

Evergy Metro TFR

In the most recent three years, the updated TFR was expected to adjust Evergy Metro's annual transmission revenues by approximately:

•$3.9 million decrease effective in January 2021;

•$1.7 million decrease effective in January 2020; and

•$2.8 million decrease effective in January 2019.

Regulatory Assets and Liabilities

The Evergy Companies have recorded assets and liabilities on their consolidated balance sheets resulting from the effects of the ratemaking process, which would not otherwise be recorded if they were not regulated. Regulatory assets represent incurred costs that are probable of recovery from future revenues. Regulatory liabilities represent future reductions in revenues or refunds to customers.

Management regularly assesses whether regulatory assets and liabilities are probable of future recovery or refund by considering factors such as decisions by the MPSC, KCC or FERC in Evergy Kansas Central's, Evergy Metro's and Evergy Missouri West's rate case filings; decisions in other regulatory proceedings, including decisions related to other companies that establish precedent on matters applicable to the Evergy Companies; and changes in laws and

regulations. If recovery or refund of regulatory assets or liabilities is not approved by regulators or is no longer deemed probable, these regulatory assets or liabilities are recognized in the current period results of operations. The Evergy Companies continued ability to meet the criteria for recording regulatory assets and liabilities may be affected in the future by restructuring and deregulation in the electric industry or changes in accounting rules. In the event that the criteria no longer applied to any or all of the Evergy Companies' operations, the related regulatory assets and liabilities would be written off unless an appropriate regulatory recovery mechanism were provided. Additionally, these factors could result in an impairment on utility plant assets.

The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Regulatory Assets	(millions)
Pension and post-retirement costs	$	867.8	$	412.9	$	359.9	$	795.9	$	359.9	$	330.7
Debt reacquisition costs	98.9		91.3		6.8		105.8		97.3		7.5
Debt fair value adjustment	104.0		—		—		112.0		—		—
Asset retirement obligations fair value adjustment	116.2		—		—		114.3		—		—
Depreciation	70.0		52.7		9.4		55.3		55.3		—
Cost of removal	183.4		125.7		57.7		129.3		94.4		34.9
Asset retirement obligations	170.8		55.0		84.0		167.1		52.8		79.4
Analog meter unrecovered investment	24.1		24.1		—		29.9		29.9		—
Treasury yield hedges	21.5		21.5		—		22.6		22.6		—
Iatan No. 1 and common facilities	6.9		—		2.8		7.1		—		2.8
Iatan No. 2 construction accounting costs	25.4		—		12.7		26.1		—		13.1
Kansas property tax surcharge	28.9		23.7		5.2		21.7		18.7		3.0
Disallowed plant costs	14.5		14.5		—		14.8		14.8		—
La Cygne environmental costs	12.4		10.1		2.3		13.7		11.2		2.5
Deferred customer programs	16.3		5.7		8.6		18.0		6.2		8.3
Fuel recovery mechanisms	26.2		1.2		17.7		34.7		—		16.6
Solar rebates	25.9		—		1.5		39.8		—		9.0

Wolf Creek outage	10.0		5.0		5.0		31.0		15.5		15.5
Pension and other post-retirement benefit non-service costs	49.8		12.8		23.4		31.8		7.4		15.6
Retired generation facilities	128.4		—		—		130.5		—		—
Merger transition costs	37.6		18.0		13.9		42.3		20.3		15.6
Other regulatory assets	35.4		22.1		4.6		28.5		17.4		5.3
Total	2,074.4		896.3		615.5		1,972.2		823.7		559.8
Less: current portion	(206.2)		(96.2)		(82.0)		(231.7)		(93.3)		(95.4)
Total noncurrent regulatory assets	$	1,868.2	$	800.1	$	533.5	$	1,740.5	$	730.4	$	464.4


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Regulatory Liabilities	(millions)
Taxes refundable through future rates	$	2,055.7	$	1,184.5	$	650.2	$	1,656.5	$	856.4	$	568.9
Deferred regulatory gain from sale leaseback	48.1		48.1		—		53.6		53.6		—
Emission allowances	46.1		—		46.1		50.1		—		50.1
Nuclear decommissioning	319.7		138.2		181.5		267.3		116.5		150.8
Pension and post-retirement costs	50.8		31.4		13.1		59.3		31.5		20.3
Jurisdictional allowance for funds used during construction	28.7		27.0		1.7		28.7		28.7		—
La Cygne leasehold dismantling costs	29.6		29.6		—		29.6		29.6		—
Cost of removal	4.4		—		—		49.1		—		—
Kansas tax credits	—		—		—		17.0		17.0		—
Purchase power agreement	6.3		6.3		—		7.4		7.4		—

Fuel recovery mechanisms	1.3		—		—		34.1		30.2		—
Sibley AAO	18.4		—		—		10.2		—		—

Other regulatory liabilities	55.8		7.8		14.8		48.7		3.9		13.5
Total	2,664.9		1,472.9		907.4		2,311.6		1,174.8		803.6
Less: current portion	(26.1)		(11.9)		(8.0)		(63.3)		(42.3)		(11.4)
Total noncurrent regulatory liabilities	$	2,638.8	$	1,461.0	$	899.4	$	2,248.3	$	1,132.5	$	792.2

The following summarizes the nature and period of recovery for each of the regulatory assets listed in the table above.

Pension and post-retirement costs: Represents unrecognized gains and losses and prior service costs that will be recognized in future net periodic pension and post-retirement costs, pension settlements amortized over various periods and financial and regulatory accounting method differences that will be eliminated over the life of the pension plans. Of these amounts, $806.3 million, $412.9 million and $333.6 million for Evergy, Evergy Kansas Central and Evergy Metro, respectively, are not included in rate base and are amortized over various periods. Additionally, $250.1 million, $(27.5) million and $137.6 million for Evergy, Evergy Kansas Central and Evergy Metro, respectively, represent differences between pension and post-retirement costs under GAAP and pension and post-retirement costs for ratemaking that will be recovered or refunded in future rates and differences in accumulated unrecognized gains and losses and prior service costs between Evergy and Evergy Metro due to Evergy Metro electing not to apply "push-down accounting" related to the merger.

Debt reacquisition costs: Includes costs incurred to reacquire and refinance debt. These costs are amortized over the term of the new debt or the remaining lives of the old debt issuances if no new debt was issued and are not included in rate base.

Debt fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West long-term debt at fair value in connection with the merger. Amount is amortized over the life of the related debt and is not included in rate base.

Asset retirement obligations fair value adjustment: Represents purchase accounting adjustments recorded to state the carrying value of Evergy Metro and Evergy Missouri West AROs at fair value in connection with the merger. Amount is amortized over the life of the related plant and is not included in rate base.

Depreciation: Represents the difference between regulatory depreciation expense and depreciation expense recorded for financial reporting purposes. These assets are included in rate base and the difference is amortized over the life of the related plant.

Cost of removal: Represents amounts spent, but not yet collected, to dispose of plant assets. This asset will decrease as removal costs are collected in rates and is included in rate base.

Asset retirement obligations: Represents amounts associated with AROs as discussed further in Note 7. These amounts are recovered over the life of the related plant and are not included in rate base.

Analog meter unrecovered investment: Represents the deferral of unrecovered investment of retired analog meters. Of this amount, $15.8 million is not included in rate base for Evergy and Evergy Kansas Central and is being amortized over a five-year period.

Treasury yield hedges: Represents the effective portion of treasury yield hedge transactions. Amortization of this amount will be included in interest expense over the term of the related debt and is not included in rate base.

Iatan No. 1 and common facilities: Represents depreciation and carrying costs related to Iatan No. 1 and common facilities. These costs are included in rate base and amortized over various periods.

Iatan No. 2 construction accounting costs: Represents the construction accounting costs related to Iatan No. 2. These costs are included in rate base and amortized through 2059.

Kansas property tax surcharge: Represents actual costs incurred for property taxes in excess of amounts collected in revenues. These costs are expected to be recovered over a one-year period and are not included in rate base.

Disallowed plant costs: The KCC originally disallowed certain costs related to the Wolf Creek plant. In 1987, the KCC revised its original conclusion and provided for recovery of an indirect disallowance with no return on investment. This regulatory asset represents the present value of the future expected revenues to be provided to recover these costs, net of the amounts amortized.

La Cygne environmental costs: Represents the deferral of depreciation and amortization expense and associated carrying charges related to the La Cygne Station environmental project. This amount will be amortized over the life of the related asset and is included in rate base.

Deferred customer programs: Represents costs related to various energy efficiency programs that have been accumulated and deferred for future recovery. Of these amounts, $10.6 million for Evergy and $8.6 million for Evergy Metro are not included in rate base and are amortized over various periods.

Fuel recovery mechanisms: Represents the actual cost of fuel consumed in producing electricity and the cost of purchased power in excess of the amounts collected from customers. This difference is expected to be recovered over a one-year period and is not included in rate base.

Solar rebates: Represents costs associated with solar rebates provided to retail electric customers. These amounts are not included in rate base and are amortized over various periods.

Wolf Creek outage: Represents deferred expenses associated with Wolf Creek's scheduled refueling and maintenance outages. These expenses are amortized during the period between planned outages and are not included in rate base.

Pension and other post-retirement benefit non-service costs: Represents the non-service component of pension and post-retirement net benefit costs that are capitalized as authorized by regulators. The amounts are included in rate base and are recovered over the life of the related asset.

Retired generation facilities: Represents amounts to be recovered for facilities that have been retired and are probable of recovery.

Merger transition costs: Represents recoverable transition costs related to the merger. The amounts are not included in rate base and are recovered from retail customers through 2028.

Other regulatory assets: Includes various regulatory assets that individually are small in relation to the total regulatory asset balance. These amounts have various recovery periods and are not included in rate base.

The following summarizes the nature and period of amortization for each of the regulatory liabilities listed in the table above.

Taxes refundable through future rates: Represents the obligation to return to customers income taxes recovered in earlier periods when corporate income tax rates were higher than current income tax rates. A large portion of this amount is related to depreciation and will be returned to customers over the life of the applicable property.

Deferred regulatory gain from sale leaseback: Represents the gain Evergy Kansas South recorded on the 1987 sale and leaseback of its 50% interest in La Cygne Unit 2. The gain is amortized over the term of the lease.

Emission allowances: Represents deferred gains related to the sale of emission allowances to be returned to customers.

Nuclear decommissioning: Represents the difference between the fair value of the assets held in the nuclear decommissioning trust and the amount recorded for the accumulated accretion and depreciation expense associated with the asset retirement obligation related to Wolf Creek.

Pension and post-retirement costs: Includes pension and post-retirement benefit obligations and expense recognized in setting prices in excess of actual pension and post-retirement expense.

Jurisdictional allowance for funds used during construction: Represents AFUDC that is accrued subsequent to the time the associated construction charges are included in prices and prior to the time the related assets are placed in service. The AFUDC is amortized to depreciation expense over the useful life of the asset that is placed in service.

La Cygne leasehold dismantling costs: Represents amounts collected but not yet spent on the contractual obligation to dismantle a portion of La Cygne Unit 2. The obligation will be discharged as the unit is dismantled.

Cost of removal: Represents amount collected, but not yet spent, to dispose of plant assets. This liability will be discharged as removal costs are incurred.

Kansas tax credits: Represents Kansas tax credits on investment in utility plant. Amounts will be credited to customers subsequent to the realization of the credits over the remaining lives of the utility plant giving rise to the tax credits.

Purchase power agreement: Represents the amount included in retail electric rates from customers in excess of costs incurred under purchase power agreements. Amounts are amortized over a five-year period.

Fuel recovery mechanisms: Represents the amount collected from customers in excess of the actual cost of fuel consumed in producing electricity and the cost of purchased power. This difference is expected to be refunded over a one-year period and is not included in rate base.

Sibley AAO: Represents the estimated amount of revenues that Evergy Missouri West has collected from customers for Sibley Station that Evergy has determined is probable of refund. These amounts were recorded in connection with an AAO granted by the MPSC in October 2019 and deferred amounts will be considered by the MPSC in Evergy Missouri West's next rate case.

Other regulatory liabilities: Includes various regulatory liabilities that individually are relatively small in relation to the total regulatory liability balance. These amounts will be credited over various periods.

GOODWILL	12 Months Ended
GOODWILL	Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILLAccounting rules require goodwill to be tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. Evergy's impairment test for the $2,336.6 million of goodwill that was recorded as a result of the Great Plains Energy and Evergy Kansas Central merger was conducted as of May 1, 2020. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value. Evergy's consolidated operations are considered one reporting unit for assessment of impairment, as management assesses financial performance and allocates resources on a consolidated basis. The determination of fair value of the reporting unit consisted of two valuation techniques: an income approach consisting of a discounted cash flow analysis and a market approach consisting of a determination of reporting unit invested capital using a market multiple derived from the historical earnings before interest, income taxes, depreciation and amortization and market prices of the stock of peer companies. The results of the two techniques were evaluated and weighted to determine a point within the range that management considered representative of fair value for the reporting unit. The fair value of the reporting unit exceeded the carrying amount, including goodwill. As a result, there was no impairment of goodwill.

ASSET RETIREMENT OBLIGATIONS

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

ASSET RETIREMENT OBLIGATIONS

AROs associated with tangible long-lived assets are legal obligations that exist under enacted laws, statutes and written or oral contracts, including obligations arising under the doctrine of promissory estoppel. These liabilities are recognized at estimated fair value as incurred with a corresponding amount capitalized as part of the cost of the related long-lived assets and depreciated over their useful lives. Accretion of the liabilities due to the passage of time is recorded to a regulatory asset and/or liability. Changes in the estimated fair values of the liabilities are recognized when known.

Evergy Kansas Central, Evergy Metro and Evergy Missouri West have AROs related to asbestos abatement and the closure and post-closure care of ponds and landfills containing coal combustion residuals (CCRs). In addition, Evergy Kansas Central and Evergy Metro have AROs related to decommissioning Wolf Creek and the retirement of wind generation facilities.

The MPSC and KCC require the owners of Wolf Creek, including Evergy Kansas South and Evergy Metro with their respective 47% ownership shares, to submit an updated decommissioning cost study every three years. The most recent study was submitted to the MPSC and KCC in September 2020. As a result of changes in estimates related to the study, Evergy, Evergy Kansas Central and Evergy Metro recorded increases to their AROs to decommission Wolf Creek of $259.1 million, $140.7 million and $118.4 million, respectively, in 2020.

The following table summarizes the change in the Evergy Companies' AROs for the periods ending December 31, 2020 and 2019.


	Evergy				Evergy Kansas Central				Evergy Metro
	2020		2019		2020		2019		2020		2019
	(millions)
Beginning balance January 1	$	674.1	$	687.1	$	272.9	$	281.1	$	253.6	$	261.0

Revision in timing and/or estimates	249.3		(22.3)		136.8		(12.4)		118.4		(9.9)
Settlements	(18.4)		(17.8)		(2.2)		(14.8)		(7.5)		(2.5)
Accretion	36.9		27.1		19.7		19.0		14.4		5.0
Ending balance	$	941.9	$	674.1	$	427.2	$	272.9	$	378.9	$	253.6
Less: current portion	(40.2)		(71.3)		(11.2)		(23.3)		(21.2)		(36.1)
Total noncurrent asset retirement obligation	$	901.7	$	602.8	$	416.0	$	249.6	$	357.7	$	217.5

PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

The following tables summarize the property, plant and equipment of Evergy, Evergy Kansas Central and Evergy Metro.


December 31, 2020	Evergy			Evergy Kansas Central			Evergy Metro
		(millions)
Electric plant in service		$	28,914.8		$	14,095.1		$	11,161.8
Electric plant acquisition adjustment		724.3			724.3			—
Accumulated depreciation		(10,998.4)			(5,293.5)			(4,532.7)
Plant in service		18,640.7			9,525.9			6,629.1
Construction work in progress		1,153.5			589.1			433.9
Nuclear fuel, net		155.9			77.7			78.2
Plant to be retired, net (a)		0.9			0.9			—
Net property, plant and equipment		$	19,951.0		$	10,193.6		$	7,141.2

December 31, 2019	Evergy			Evergy Kansas Central			Evergy Metro
		(millions)
Electric plant in service		$	27,768.8		$	13,538.1		$	10,776.5
Electric plant acquisition adjustment		740.6			740.6			—
Accumulated depreciation		(10,293.7)			(4,951.5)			(4,272.0)
Plant in service		18,215.7			9,327.2			6,504.5
Construction work in progress		839.2			472.8			269.9
Nuclear fuel, net		128.5			63.9			64.6
Plant to be retired, net (a)		1.0			1.0			—
Net property, plant and equipment		$	19,184.4		$	9,864.9		$	6,839.0

(a) As of December 31, 2020 and 2019, represents the planned retirement of Evergy Kansas Central analog meters prior to the end of their remaining useful lives.

The following table summarizes the property, plant and equipment of VIEs for Evergy and Evergy Kansas Central.


		December 31
	2020			2019
		(millions)
Electric plant of VIEs		$	392.1		$	392.1
Accumulated depreciation of VIEs		(237.2)			(230.1)
Net property, plant and equipment of VIEs		$	154.9		$	162.0

Depreciation Expense

The Evergy Companies' depreciation expense is detailed in the following table.


	2020		2019		2018
	(millions)
Evergy (a)	$	804.7	$	786.3	$	567.9
Evergy Kansas Central (a)	435.1		425.8		371.3
Evergy Metro (b)	269.5		262.7		235.3

(a) Approximately $7.1 million of depreciation expense in each of 2020, 2019 and 2018 was attributable to property, plant and equipment of VIEs.

(b) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

JOINTLY-OWNED ELECTRIC UTILITY PLANTS

12 Months Ended

Dec. 31, 2020

Jointly Owned Electric Utility Plants [Abstract]

JOINTLY-OWNED ELECTRIC UTILITY PLANTS

Evergy's, Evergy Kansas Central's and Evergy Metro's share of jointly-owned electric utility plants at December 31, 2020, are detailed in the following tables.


Evergy
	Wolf Creek Unit			La Cygne Units (a)			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common			Jeffrey Energy Center			State Line
	(millions, except MW amounts)
Evergy's share		94%			100%			88%			73%			79%			100%			40%

Electric plant in service		$	4,059.1		$	2,207.6		$	773.3		$	1,404.3		$	499.7		$	2,435.4		$	115.0
Accumulated depreciation		1,970.3			779.4			265.7			459.3			127.8			984.1			80.6
Nuclear fuel, net		155.9			—			—			—			—			—			—
Construction work in progress		183.5			27.7			10.3			10.7			4.4			84.1			12.9
2021 accredited capacity-MWs		1,108			1,426			618			640			n/a			2,012			200

(a) The VIE consolidated by Evergy and Evergy Kansas Central holds its 50% leasehold interest in La Cygne Unit 2. This 50% leasehold interest in La Cygne Unit 2 is reflected in the information provided above. See Note 19 for additional information.


Evergy Kansas Central
	Wolf Creek Unit			La Cygne Units (a)			Jeffrey Energy Center		State Line
	(millions, except MW amounts)
Evergy Kansas Central's share		47%			50%		92%			40%

Electric plant in service		$	1,995.2		$	1,046.5	$	2,229.5		$	115.0
Accumulated depreciation		956.6			446.2		895.3			80.6
Nuclear fuel, net		77.7			—		—			—
Construction work in progress		77.2			10.6		77.3			12.9
2021 accredited capacity-MWs		554			713		1,837			200


Evergy Metro
	Wolf Creek Unit			La Cygne Units			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common
	(millions, except MW amounts)
Evergy Metro's share		47%			50%			70%			55%			61%

Electric plant in service		$	2,063.9		$	1,161.1		$	600.2		$	1,065.3		$	396.5
Accumulated depreciation		1,013.7			333.2			204.7			397.4			110.5
Nuclear fuel, net		78.2			—			—			—			—
Construction work in progress		106.3			17.1			8.3			8.0			3.1
2021 accredited capacity-MWs		554			713			492			482			n/a

Each owner must fund its own portion of the plant's operating expenses and capital expenditures. The Evergy Companies' share of direct expenses are included in the appropriate operating expense classifications in Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements.

PENSION PLANS AND POST-RETIREMENT BENEFITS

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

PENSION PLANS AND POST-RETIREMENT BENEFITS

Evergy and certain of its subsidiaries maintain, and Evergy Kansas Central and Evergy Metro participate in, qualified non-contributory defined benefit pension plans covering the majority of Evergy Kansas Central's and Evergy Metro's employees as well as certain non-qualified plans covering certain active and retired officers. Evergy is also responsible for its indirect 94% ownership share of Wolf Creek's defined benefit plans, consisting of Evergy Kansas South's and Evergy Metro's respective 47% ownership shares.

For the majority of employees, pension benefits under these plans reflect the employees' compensation, years of service and age at retirement. However, for the plan covering Evergy Kansas Central's employees, the benefits for non-union employees hired between 2002 and the second quarter of 2018 and union employees hired beginning in 2012 are derived from a cash balance account formula. The plan was closed to future non-union employees in 2018. For the plans covering Evergy Metro's employees, the benefits for union employees hired beginning in 2014 are derived from a cash balance account formula and the plans were closed to future non-union employees in 2014.

Evergy and its subsidiaries also provide certain post-retirement health care and life insurance benefits for substantially all retired employees of Evergy Kansas Central and Evergy Metro and their respective shares of Wolf Creek's post-retirement benefit plans.

The Evergy Companies record pension and post-retirement expense in accordance with rate orders from the KCC and MPSC that allow the difference between pension and post-retirement costs under GAAP and costs for ratemaking to be recognized as a regulatory asset or liability. This difference between financial and regulatory accounting methods is due to timing and will be eliminated over the life of the plans.

For 2020, Evergy and Evergy Metro recorded pension settlement charges of $11.2 million and $14.3 million, respectively. For 2019, Evergy and Evergy Metro recorded pension settlement charges of $15.6 million and $23.0 million, respectively. These settlement charges were the result of accelerated pension distributions primarily related to voluntary severance programs. Evergy and Evergy Metro deferred substantially all of the charges to a regulatory asset and expect to recover these amounts over future periods pursuant to regulatory agreements.

The following pension benefits tables provide information relating to the funded status of all defined benefit pension plans on an aggregate basis as well as the components of net periodic benefit costs. For financial reporting purposes, the market value of plan assets is the fair value. Net periodic benefit costs reflect total plan benefit costs prior to the effects of capitalization and sharing with joint owners of power plants. Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2020	$	2,718.2	$	1,323.4	$	1,371.4	$	264.3	$	138.7	$	125.6
Service cost	78.9		27.1		51.8		2.7		1.1		1.6
Interest cost	96.8		47.0		49.1		9.2		4.8		4.4
Contribution by participants	—		—		—		9.3		1.8		7.5
Plan amendments	4.2		8.1		(3.9)		1.0		0.5		0.5
Actuarial loss	273.9		127.0		144.8		19.6		11.0		8.6
Benefits paid	(202.5)		(102.3)		(99.0)		(25.7)		(11.1)		(14.6)
Settlements	(62.9)		—		(62.9)		—		—		—
Other	(5.5)		(0.7)		(4.8)		—		—		—
PBO at December 31, 2020	$	2,901.1	$	1,429.6	$	1,446.5	$	280.4	$	146.8	$	133.6
Change in plan assets
Fair value of plan assets at January 1, 2020	$	1,732.8	$	842.1	$	890.7	$	239.9	$	120.5	$	119.4
Actual return on plan assets	209.9		99.7		110.2		20.7		13.7		7.0
Contributions by employer and participants	123.4		45.8		77.6		11.7		2.1		9.6
Benefits paid	(198.6)		(99.9)		(98.7)		(24.0)		(10.5)		(13.5)
Settlements	(62.9)		—		(62.9)		—		—		—
Other	(5.5)		(0.7)		(4.8)		—		—		—
Fair value of plan assets at December 31, 2020	$	1,799.1	$	887.0	$	912.1	$	248.3	$	125.8	$	122.5
Funded status at December 31, 2020	$	(1,102.0)	$	(542.6)	$	(534.4)	$	(32.1)	$	(21.0)	$	(11.1)


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Amounts recognized in the consolidated balance sheets					(millions)
Non-current asset	$	—	$	—	$	—	$	21.3	$	—	$	21.3
Current pension and other post-retirement liability	(4.4)		(2.5)		(0.8)		(1.6)		(0.8)		(0.9)
Noncurrent pension liability and other post-retirement liability	(1,097.6)		(540.1)		(533.6)		(51.8)		(20.2)		(31.5)
Net amount recognized before regulatory treatment	(1,102.0)		(542.6)		(534.4)		(32.1)		(21.0)		(11.1)
Accumulated OCI or regulatory asset/liability	566.9		408.0		216.9		4.0		1.0		(7.7)
Net amount recognized at December 31, 2020	$	(535.1)	$	(134.6)	$	(317.5)	$	(28.1)	$	(20.0)	$	(18.8)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	551.8	$	388.9	$	218.6	$	2.2	$	(0.3)	$	—
Prior service cost	15.1		19.1		(1.7)		1.8		1.3		(7.7)
Net amount recognized at December 31, 2020	$	566.9	$	408.0	$	216.9	$	4.0	$	1.0	$	(7.7)


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2019	$	2,553.4	$	1,258.9	$	1,272.4	$	249.3	$	133.6	$	115.7
Service cost	79.1		29.0		50.1		2.5		1.1		1.4
Interest cost	108.0		53.7		53.3		10.5		5.6		4.9
Contribution by participants	—		—		—		8.8		1.9		6.9

Actuarial loss	262.4		120.3		140.5		20.9		9.5		11.4
Benefits paid	(180.5)		(136.9)		(42.3)		(27.7)		(13.0)		(14.7)
Settlements	(96.6)		—		(96.6)		—		—		—
Other	(7.6)		(1.6)		(6.0)		—		—		—
PBO at December 31, 2019	$	2,718.2	$	1,323.4	$	1,371.4	$	264.3	$	138.7	$	125.6
Change in plan assets
Fair value of plan assets at January 1, 2019	$	1,603.4	$	804.6	$	798.8	$	223.3	$	109.7	$	113.6
Actual return on plan assets	284.0		130.5		153.5		30.0		20.0		10.0
Contributions by employer and participants	125.2		43.0		82.2		13.2		3.5		9.7
Benefits paid	(175.6)		(134.4)		(41.2)		(26.6)		(12.7)		(13.9)
Settlements	(96.6)		—		(96.6)		—		—		—
Other	(7.6)		(1.6)		(6.0)		—		—		—
Fair value of plan assets at December 31, 2019	$	1,732.8	$	842.1	$	890.7	$	239.9	$	120.5	$	119.4
Funded status at December 31, 2019	$	(985.4)	$	(481.3)	$	(480.7)	$	(24.4)	$	(18.2)	$	(6.2)


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Amounts recognized in the consolidated balance sheets					(millions)
Non-current asset	$	—	$	—	$	—	$	15.0	$	—	$	15.0
Current pension and other post-retirement liability	(5.6)		(3.0)		(1.3)		(1.9)		(1.0)		(0.9)
Noncurrent pension liability and other post- retirement liability	(979.8)		(478.3)		(479.4)		(37.5)		(17.2)		(20.3)
Net amount recognized before regulatory treatment	(985.4)		(481.3)		(480.7)		(24.4)		(18.2)		(6.2)
Accumulated OCI or regulatory asset/liability	454.1		354.9		192.3		(4.4)		(2.9)		(13.0)
Net amount recognized at December 31, 2019	$	(531.3)	$	(126.4)	$	(288.4)	$	(28.8)	$	(21.1)	$	(19.2)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	439.7	$	342.3	$	189.4	$	(5.7)	$	(4.2)	$	(4.9)
Prior service cost	14.4		12.6		2.9		1.3		1.3		(8.1)
Net amount recognized at December 31, 2019	$	454.1	$	354.9	$	192.3	$	(4.4)	$	(2.9)	$	(13.0)

Actuarial losses for the Evergy Companies' pension benefit plans for 2020 and 2019 were primarily driven by a decrease in the discount rate used to measure the benefit obligation of approximately 70 basis points in each of 2020 and 2019 as a result of lower market interest rates.

As of December 31, 2020 and 2019, Evergy's pension benefits include non-qualified benefit obligations of $52.1 million and $49.4 million, respectively, which are funded by trusts containing assets of $46.3 million and $45.5 million, respectively. As of December 31, 2020 and 2019, Evergy Kansas Central's pension benefits include non-qualified benefit obligations of $27.0 million and $26.0 million, respectively, which are funded by trusts containing

assets of $32.7 million and $31.7 million, respectively. The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	78.9	$	27.1	$	51.8	$	2.7	$	1.1	$	1.6
Interest cost	96.8		47.0		49.1		9.2		4.8		4.4
Expected return on plan assets	(105.6)		(53.1)		(54.7)		(9.3)		(6.6)		(2.7)
Prior service cost	1.8		1.6		0.8		0.5		0.5		—
Recognized net actuarial (gain) loss	46.4		33.9		45.7		0.2		—		(0.6)
Settlement and special termination benefits	11.2		—		14.3		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	129.5		56.5		107.0		3.3		(0.2)		2.7
Regulatory adjustment	29.6		5.9		(11.6)		(4.0)		(3.0)		(0.2)
Intercompany allocations	n/a		(0.2)		(22.6)		n/a		0.1		(0.3)
Net periodic benefit costs (income)	159.1		62.2		72.8		(0.7)		(3.1)		2.2
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net loss	169.7		80.4		89.3		8.2		3.9		4.3
Amortization of gain (loss)	(59.2)		(33.8)		(60.0)		(0.2)		—		0.6
Prior service cost	4.1		8.1		(3.9)		0.9		0.5		0.4
Amortization of prior service cost	(1.8)		(1.6)		(0.8)		(0.5)		(0.5)		—
Total recognized in OCI or regulatory asset/liability	112.8		53.1		24.6		8.4		3.9		5.3
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	271.9	$	115.3	$	97.4	$	7.7	$	0.8	$	7.5


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	79.1	$	29.0	$	50.1	$	2.5	$	1.1	$	1.4
Interest cost	108.0		53.7		53.3		10.5		5.6		4.9
Expected return on plan assets	(106.3)		(54.8)		(48.9)		(10.0)		(6.7)		(3.3)
Prior service cost	1.9		1.7		0.9		0.5		0.5		—
Recognized net actuarial (gain) loss	33.0		25.5		49.8		(1.2)		(0.6)		(1.4)
Settlement and special termination benefits	15.6		—		23.0		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	131.3		55.1		128.2		2.3		(0.1)		1.6
Regulatory adjustment	37.4		3.0		(19.2)		(3.4)		(3.0)		0.4
Intercompany allocations	n/a		—		(34.4)		n/a		—		(0.4)
Net periodic benefit costs (income)	168.7		58.1		74.6		(1.1)		(3.1)		1.6
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	84.7		44.6		35.9		0.9		(3.8)		4.7
Amortization of gain (loss)	(48.6)		(25.5)		(72.8)		1.2		0.6		1.4

Amortization of prior service cost	(1.9)		(1.7)		(0.9)		(0.5)		(0.5)		—
Total recognized in OCI or regulatory asset/liability	34.2		17.4		(37.8)		1.6		(3.7)		6.1
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	202.9	$	75.5	$	36.8	$	0.5	$	(6.8)	$	7.7


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	60.7	$	32.2	$	48.6	$	2.3	$	1.3	$	2.0
Interest cost	82.5		50.7		49.9		8.0		5.0		4.8
Expected return on plan assets	(86.4)		(55.9)		(55.5)		(8.8)		(7.0)		(2.8)
Prior service cost	0.7		0.7		0.7		0.5		0.5		0.1
Recognized net actuarial (gain) loss	32.6		32.6		45.1		(0.6)		(0.6)		(0.2)

Net periodic benefit costs before regulatory adjustment and intercompany allocations	90.1		60.3		88.8		1.4		(0.8)		3.9
Regulatory adjustment	8.3		8.8		0.7		(1.7)		(2.0)		(0.1)
Intercompany allocations	n/a		—		(21.6)		n/a		—		(1.1)
Net periodic benefit costs (income)	98.4		69.1		67.9		(0.3)		(2.8)		2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	67.2		(13.2)		25.9		4.9		11.7		(14.0)
Amortization of gain (loss)	(32.6)		(32.6)		(45.1)		0.6		0.6		0.2
Prior service cost	13.4		11.4		2.0		—		—		—
Amortization of prior service cost	(0.7)		(0.7)		(0.7)		(0.5)		(0.5)		(0.1)
Total recognized in OCI or regulatory asset/liability	47.3		(35.1)		(17.9)		5.0		11.8		(13.9)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	145.7	$	34.0	$	50.0	$	4.7	$	9.0	$	(11.2)

For financial reporting purposes, the estimated prior service cost and net actuarial (gain) loss for the defined benefit plans are amortized from accumulated other comprehensive income (OCI) or a regulatory asset into net periodic benefit cost. The Evergy Companies amortize prior service cost on a straight-line basis over the average future service of the active employees (plan participants) benefiting under the plan. Evergy and Evergy Kansas Central amortize the net actuarial (gain) loss on a straight-line basis over the average future service of active plan participants benefiting under the plan without application of an amortization corridor. Evergy Metro amortizes the net actuarial (gain) loss on a rolling five-year average basis.

Pension and other post-retirement benefit plans with the PBO, accumulated benefit obligation (ABO) or accumulated other post-retirement benefit obligation (APBO) in excess of the fair value of plan assets at year-end are detailed in the following tables.


December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,534.1	$	1,281.6	$	1,227.4
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,901.1	$	1,429.6	$	1,446.5
Fair value of plan assets	1,799.1		887.0		912.1
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,534.1	$	1,281.6	$	1,227.4
Fair value of plan assets	1,799.1		887.0		912.1
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	280.4	$	146.8	$	133.6
Fair value of plan assets	248.3		125.8		122.5


December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,390.5	$	1,196.8	$	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,718.2	$	1,323.4	$	1,371.4
Fair value of plan assets	1,732.8		842.1		890.7
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,390.5	$	1,196.8	$	1,170.2
Fair value of plan assets	1,732.8		842.1		890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	264.3	$	138.7	$	125.6
Fair value of plan assets	239.9		120.5		119.4

The expected long-term rate of return on plan assets represents the Evergy Companies' estimate of the long-term return on plan assets and is based on historical and projected rates of return for current and planned asset classes in the plans' investment portfolios. Assumed projected rates of return for each asset class were selected after analyzing historical experience and future expectations of the returns of various asset classes. Based on the target asset allocation for each asset class, the overall expected rate of return for the portfolios was developed and adjusted for the effect of projected benefits paid from plan assets and future plan contributions.

The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs for the Evergy Companies' pension and post-retirement benefit plans.


Weighted-average assumptions used to determine the benefit obligation at December 31, 2020	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	2.95	%	2.93	%	2.97	%	2.84	%	2.80	%	2.88	%
Rate of compensation increase	3.71	%	3.76	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.12	%	4.00	%	4.46	%	n/a		n/a		n/a

Weighted-average assumptions used to determine the benefit obligation at December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Rate of compensation increase	3.74	%	3.78	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a


Weighted-average assumptions used to determine net costs for the year ended December 31, 2020	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Expected long-term return on plan assets	6.63	%	6.70	%	6.56	%	4.19	%	6.00	%	2.37	%
Rate of compensation increase	3.74	%	3.75	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a

Weighted-average assumptions used to determine net costs for the year ended December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Expected long-term return on plan assets	6.61	%	6.75	%	6.47	%	4.44	%	6.00	%	2.94	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a

Evergy expects to contribute $131.6 million to the pension plans in 2021 to meet Employee Retirement Income Security Act of 1974, as amended (ERISA) funding requirements and regulatory orders, of which $41.2 million is expected to be paid by Evergy Kansas Central and $90.4 million is expected to be paid by Evergy Metro. The Evergy Companies' funding policy is to contribute amounts sufficient to meet the ERISA funding requirements and MPSC and KCC rate orders plus additional amounts as considered appropriate; therefore, actual contributions may differ from expected contributions. Also in 2021, Evergy expects to contribute $4.1 million to the post-retirement benefit plans, of which $0.6 million is expected to be paid by Evergy Kansas Central and $3.5 million is expected to be paid by Evergy Metro.

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2030.


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2021	$	187.6	$	96.2	$	90.2	$	16.7	$	9.5	$	7.2
2022	189.6		95.5		92.8		16.4		9.3		7.1
2023	192.6		95.7		95.6		16.1		9.1		6.9
2024	193.2		95.2		96.7		15.7		8.8		6.9
2025	195.5		94.5		99.4		15.3		8.6		6.8
2026-2030	957.0		442.8		506.5		73.1		39.8		33.3

As of December 31, 2020, Evergy Kansas Central and Evergy Metro each maintained separate trusts for both their qualified pension and post-retirement benefits. These plans are managed in accordance with prudent investor guidelines contained in the ERISA requirements.

The primary objective of the Evergy Kansas Central pension plan is to provide a source of retirement income for its participants and beneficiaries, and the primary financial objective of the plan is to improve its funded status. The primary objective of the Evergy Kansas Central post-retirement benefit plan is growth in assets and the preservation of principal, while minimizing interim volatility, to meet anticipated claims of plan participants.

The primary objective of the Evergy Metro pension plans is to meet or exceed the target rate of return for the plan within a reasonable and prudent level of risk. The primary objective of the Evergy Metro post-retirement benefit plans is to preserve capital, maintain sufficient liquidity and earn a consistent rate of return.

The investment strategies of both the Evergy Kansas Central and Evergy Metro pension and post-retirement plans support the above objectives of the plans. The portfolios are invested, and periodically rebalanced, to achieve the targeted allocations detailed below. The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets. [to be updated]


	Pension Benefits		Post-Retirement Benefits
	Evergy Kansas Central	Evergy Metro	Evergy Kansas Central	Evergy Metro
Domestic equities	29%	30%	33%	3%
International equities	20%	24%	22%	—%
Bonds	36%	33%	45%	85%
Mortgage & asset backed securities	—%	—%	—%	4%
Real estate investments	4%	5%	—%	—%
Other investments	11%	9%	—%	7%

Fair Value Measurements

Evergy classifies recurring and non-recurring fair value measurements based on the fair value hierarchy as discussed in Note 14. The following are descriptions of the valuation methods of the primary fair value measurements disclosed below.

Domestic equities - consist of individually held domestic equity securities and domestic equity mutual funds. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the net asset value (NAV) per fund share, derived from the quoted prices in active markets of the underlying securities are not classified within the fair value hierarchy.

International equities - consist of individually held international equity securities and international equity mutual funds. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the NAV per fund share, derived from the quoted prices in active markets of the underlying securities are not classified within the fair value hierarchy.

Bond funds - consist of funds maintained by investment companies that invest in various types of fixed income securities consistent with the funds' stated objectives. Securities and funds, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as Level 1. Funds that are valued by fund administrators using the NAV per fund share, derived from the quoted prices in active markets of the underlying securities, are not classified within the fair value hierarchy.

Corporate bonds - consists of individually held, primarily domestic, corporate bonds that are traded in less than active markets or priced with models using highly observable inputs that are categorized as Level 2.

U.S. Treasury and agency bonds - consists of individually held U.S. Treasury securities and U.S. agency bonds. U.S. Treasury securities, which are publicly quoted, are valued based on quoted prices in active markets and are categorized as a Level 1. U.S. agency bonds, which are publicly quoted, are traded in less than active markets or priced with models using highly observable inputs and are categorized as Level 2.

Mortgage and asset backed securities - consists of individually held securities that are traded in less than active markets or valued with models using highly observable inputs that are categorized as Level 2.

Real estate investments - consists of traded real estate investment trusts valued at the closing price reported on the major market on which the trusts are traded and are categorized as Level 1 and institutional trust funds valued at NAV per fund share and are not categorized in the fair value hierarchy.

Combination debt/equity/other fund - consists of a fund that invests in various types of debt, equity and other asset classes consistent with the fund's stated objectives. The fund, which is publicly quoted, is valued based on quoted prices in active markets and is categorized as Level 1.

Alternative investments - consists of investments in institutional trust and hedge funds that are valued by fund administrators using the NAV per fund share, derived from the underlying investments of the fund, and are not classified within the fair value hierarchy.

Short-term investments - consists of fund investments in high-quality, short-term, U.S. dollar-denominated instruments with an average maturity of 60 days that are valued at NAV per fund share and are not categorized in the fair value hierarchy.

Cash and cash equivalents - consists of investments with original maturities of three months or less when purchased that are traded in active markets and are categorized as Level 1.

The fair values of the Evergy Companies' pension plan assets at December 31, 2020 and 2019, by asset category are in the following tables.


				Fair Value Measurements Using
Description	December 31 2020			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	248.5		$	151.3		$	—		$	—		$	97.2
International equities		171.2			103.8			—			—			67.4
Bond funds		281.2			230.7			—			—			50.5



Real estate investments		46.7			—			—			—			46.7
Combination debt/equity/other fund		30.4			30.4			—			—			—
Alternative investment funds		83.6			—			—			—			83.6
Short-term investments		25.4			—			—			—			25.4


Total		$	887.0		$	516.2		$	—		$	—		$	370.8

Evergy Metro Pension Plans
Domestic equities		$	247.4		$	191.9		$	—		$	—		$	55.5
International equities		220.8			153.4			—			—			67.4
Bond funds		78.1			21.1			—			—			57.0
Corporate bonds		133.6			—			133.6			—			—
U.S. Treasury and agency bonds		73.8			61.5			12.3			—			—
Mortgage and asset backed securities		5.0			—			5.0			—			—
Real estate investments		40.2			1.6			—			—			38.6
Combination debt/equity/other fund		15.6			15.6			—			—			—
Alternative investment funds		39.7			—			—			—			39.7
Cash and cash equivalents		57.3			57.3			—			—			—
Short-term investments		1.4			—			—			—			1.4
Other		(0.8)			—			(0.8)			—			—
Total		$	912.1		$	502.4		$	150.1		$	—		$	259.6


				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	233.8		$	150.6		$	—		$	—		$	83.2
International equities		162.4			101.5			—			—			60.9
Bond funds		281.7			233.0			—			—			48.7
Real estate investments		46.5			—			—			—			46.5
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		78.5			—			—			—			78.5
Short-term investments		9.1			—			—			—			9.1

Total		$	842.1		$	515.2		$	—		$	—		$	326.9

Evergy Metro Pension Plans
Domestic equities		$	244.8		$	195.3		$	—		$	—		$	49.5
International equities		178.7			117.7			—			—			61.0
Bond funds		71.0			15.6			—			—			55.4
Corporate bonds		123.9			—			123.9			—			—
U.S. Treasury and agency bonds		70.9			53.5			17.4			—			—
Mortgage and asset backed securities		5.7			—			5.7			—			—
Real estate investments		50.8			12.8			—			—			38.0
Combination debt/equity/other fund		11.9			11.9			—			—			—
Alternative investment funds		36.6			—			—			—			36.6
Cash and cash equivalents		92.9			92.9			—			—			—
Short-term investments		1.0			—			—			—			1.0
Other		2.5			—			2.5			—			—
Total		$	890.7		$	499.7		$	149.5		$	—		$	241.5

The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2020 and 2019, by asset category are in the following tables.


				Fair Value Measurements Using
Description	December 31 2020			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	41.9		$	—		$	—		$	—		$	41.9
International equities		27.7			—			—			—			27.7
Bond funds		55.5			—			—			—			55.5







Cash and cash equivalents		0.7			0.7			—			—			—

Total		$	125.8		$	0.7		$	—		$	—		$	125.1

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	4.6		$	4.6		$	—		$	—		$	—
International equities		1.2			1.2			—			—			—
Bond funds		79.0			0.2			—			—			78.8
Corporate bonds		17.9			—			17.9			—			—
U.S. Treasury and agency bonds		13.6			5.7			7.9			—			—
Mortgage and asset backed securities		0.5			—			0.5			—			—



Cash and cash equivalents		5.4			5.4			—			—			—
Other		0.3			—			0.3			—			—
Total		$	122.5		$	17.1		$	26.6		$	—		$	78.8


				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	40.5		$	—		$	—		$	—		$	40.5
International equities		26.0			—			—			—			26.0
Bond funds		52.9			—			—			—			52.9
Cash and cash equivalents		1.1			1.1			—			—			—
Total		$	120.5		$	1.1		$	—		$	—		$	119.4

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	3.2		$	3.2		$	—		$	—		$	—
International equities		1.1			1.1			—			—			—
Bond funds		77.5			0.1			—			—			77.4
Corporate bonds		17.8			—			17.8			—			—
U.S. Treasury and agency bonds		11.5			4.1			7.4			—			—
Mortgage and asset backed securities		1.3			—			1.3			—			—
Cash and cash equivalents		6.7			6.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	119.4		$	15.2		$	26.8		$	—		$	77.4

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. The cost trend assumptions are detailed in the following tables.


Assumed annual health care cost growth rates as of December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.0	%	6.0	%	6.0	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Assumed annual health care cost growth rates as of December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.3	%	6.3	%	6.3	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Employee Savings Plans

Evergy has defined contribution savings plans (401(k)) that cover substantially all employees. Evergy matches employee contributions, subject to limits. The annual costs of the plans are detailed in the following table. Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.


	2020		2019		2018
	(millions)
Evergy	$	17.4	$	17.6	$	16.3
Evergy Kansas Central	9.6		9.6		9.9
Evergy Metro	7.8		8.0		8.3

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 715
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

EQUITY COMPENSATION

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

EQUITY COMPENSATION

Upon the consummation of the merger, Evergy assumed both Evergy Kansas Central's Long-Term Incentive and Share Award plan (LTISA) and Great Plains Energy's Amended Long-Term Incentive Plan, which was renamed the Evergy, Inc. Long-Term Incentive Plan. All outstanding share-based payment awards under Evergy Kansas Central's LTISA vested at the closing of the merger transaction and were converted into a right to receive Evergy common stock with the exception of certain RSUs and deferred director share units issued prior to the closing of the merger to certain directors, officers and employees of Evergy Kansas Central. The vesting of these shares resulted in the recognition of $14.6 million of compensation expense in Evergy's and Evergy Kansas Central's consolidated statements of income and comprehensive income for 2018.

All of Great Plains Energy's outstanding performance shares, restricted stock, RSUs and director deferred share units under Great Plains Energy's Amended Long-Term Incentive Plan were converted into equivalent Evergy performance shares, restricted stock, RSUs and director deferred share units at Great Plains Energy's merger exchange ratio of 0.5981. See Note 2 for more information regarding the merger.

The following table summarizes the Evergy Companies' equity compensation expense and the associated income tax benefit.


	2020		2019		2018
Evergy	(millions)
Equity compensation expense	$	15.5	$	15.5	$	30.7
Income tax benefit	2.2		3.0		1.4
Evergy Kansas Central
Equity compensation expense	7.6		6.7		24.8
Income tax benefit	1.6		1.9		1.4
Evergy Metro(a)
Equity compensation expense	5.7		5.7		6.5
Income tax benefit	0.2		0.3		0.1

(a) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Restricted Share Units

Evergy has utilized RSUs for new grants of stock-based compensation awards subsequent to the merger. RSU awards are grants that entitle the holder to receive shares of common stock as the awards vest. These RSU awards are defined as nonvested shares and do not include restrictions once the awards have vested. These RSUs either take the form of RSUs with performance measures that vest upon expiration of the award term or RSUs with only service requirements that vest solely upon the passage of time. As of December 31, 2020, Evergy also had an insignificant amount of restricted stock and performance shares outstanding related to Great Plains Energy equity compensation awards that converted to equivalent Evergy awards at the closing of the merger transaction in 2018. These remaining restricted stock and performance share awards will vest in the first quarter of 2021.

RSUs with Performance Measures

The payment of RSUs with performance measures is contingent upon achievement of specific performance goals over a stated period of time as approved by the Compensation and Leadership Development Committee of the Board. The numbers of RSUs with performances measures ultimately paid can vary from the numbers of RSUs with performance measures initially granted depending on Evergy's performance over stated performance periods. Compensation expense for RSUs with performance measures is calculated by recognizing the portion of the fair value for each reporting period for which the requisite service has been rendered. Dividends are accrued over the vesting period and paid in cash based on the number of RSUs with performance measures ultimately paid.

The fair value of RSUs with performance measures is estimated using the market value of Evergy's stock at the valuation date and a Monte Carlo simulation technique that incorporates assumptions for inputs of expected volatilities, dividend yield and risk-free rates. Expected volatility is based on daily stock price change during a historical period commensurate with the remaining term of the performance period of the grant. The risk-free rate is based upon the rate at the time of the evaluation for zero-coupon government bonds with a maturity consistent with the remaining performance period of the grant. The dividend yield is based on the most recent dividends paid and the actual closing stock price on the valuation date. For shares granted in 2020, inputs for expected volatility, dividend yield and the risk-free rate were 17%, 2.93% and 0.72%, respectively.

RSU activity for awards with performance measures for 2020 is summarized in the following table.


	Nonvested Restricted Share Units		Grant Date Fair Value*
Beginning balance January 1, 2020		197,250		$	37.87
Granted		175,991		87.98

Forfeited		(25,277)		60.55
Ending balance December 31, 2020		347,964		61.57

* weighted-average

At December 31, 2020, the remaining weighted-average contractual term related to RSU awards with performance measures was 1.7 years. The weighted-average grant-date fair value of RSUs granted with performance measures was $87.98 and $37.87 in 2020 and 2019, respectively. At December 31, 2020, there was $17.5 million of unrecognized compensation expense related to unvested RSUs with performance measures. No RSUs with performance measures vested in 2020 and 2019.

RSUs with Only Service Requirements

Evergy measures the fair value of RSUs with only service requirements based on the fair market value of the underlying common stock as of the grant date. RSU awards with only service conditions recognize compensation expense by multiplying shares by the grant-date fair value related to the RSU and recognizing it on a straight-line basis over the requisite service period for the entire award, including for those RSUs that have a graded vesting schedule. Nonforfeitable dividend equivalents, or the rights to receive cash equal to the value of dividends paid on Evergy's common stock, are paid on certain of these RSUs during the vesting period. Nonforfeitable dividend equivalents are recorded directly to retained earnings.

RSU activity for awards with only service requirements for 2020 is summarized in the following table.


	Nonvested Restricted Share Units		Grant Date Fair Value*
Beginning balance January 1, 2020		233,350		$	54.16
Granted		59,539		68.92
Vested		(120,536)		53.94
Forfeited		(11,611)		59.27
Ending balance December 31, 2020		160,742		59.42

* weighted-average

At December 31, 2020, the remaining weighted-average contractual term related to RSU awards with only service requirements was 1.3 years. The weighted-average grant-date fair value of RSUs granted with only service requirements was $68.92, $54.47 and $52.16 in 2020, 2019 and 2018, respectively. At December 31, 2020, there was $3.5 million of unrecognized compensation expense related to unvested RSUs. The total fair value of RSUs with only service requirements that vested was $6.5 million, $2.6 million and $16.0 million in 2020, 2019 and 2018, respectively.

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT

Evergy's $2.5 billion master credit facility expires in 2023. Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West have borrowing capacity under the master credit facility with specific sublimits for each borrower. These sublimits can be unilaterally adjusted by Evergy for each borrower provided the sublimits remain within minimum and maximum sublimits as specified in the facility. A default by any borrower under the facility or one of its significant subsidiaries on other indebtedness totaling more than $100.0 million constitutes a default by that borrower under the facility. Under the terms of this facility, each of Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West is required to maintain a total indebtedness to total capitalization ratio, as defined in the facility, of not greater than 0.65 to 1.00 at all times. As of December 31, 2020, Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West were in compliance with this covenant.

The following table summarizes the committed credit facilities (excluding receivable sale facilities discussed in Note 4) available to the Evergy Companies as of December 31, 2020 and 2019.


			Amounts Drawn
	Master Credit Facility		Commercial Paper		Letters of Credit		Cash Borrowings		Available Borrowings		Weighted Average Interest Rate on Short-Term Borrowings
December 31, 2020	(millions)
Evergy, Inc.	$	450.0	n/a		$	0.7	$	200.0	$	249.3	1.40%
Evergy Kansas Central	1,000.0		50.0		17.0		—		933.0		0.23%
Evergy Metro	600.0		—		—		—		600.0		—%
Evergy Missouri West	450.0		65.0		2.0		—		383.0		0.36%
Evergy	$	2,500.0	$	115.0	$	19.7	$	200.0	$	2,165.3

December 31, 2019
Evergy, Inc.	$	450.0	n/a		$	0.7	$	20.0	$	429.3	2.99%
Evergy Kansas Central	1,000.0		249.2		14.2		—		736.6		2.07%
Evergy Metro	600.0		199.3		—		—		400.7		2.02%
Evergy Missouri West	450.0		93.4		2.1		—		354.5		2.02%
Evergy	$	2,500.0	$	541.9	$	17.0	$	20.0	$	1,921.1

LONG-TERM DEBT

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

LONG-TERM DEBT

The Evergy Companies' long-term debt is detailed in the following tables.


December 31, 2020	Issuing Entity	Year Due	Evergy		Evergy Kansas Central		Evergy Metro
Mortgage Bonds			(millions)
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0		250.0		—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0		350.0		—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0		300.0		—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0		550.0		—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0		430.0		—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0		250.0		—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0		300.0		—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0		300.0
3.45% Series	Evergy Kansas Central, Inc.	2050	500.0		500.0		—
6.15% Series	Evergy Kansas South, Inc.	2023	50.0		50.0		—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0		175.0		—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0		100.0		—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0		250.0		—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5		—		79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0		—		400.0
2.25% Series	Evergy Metro, Inc.	2030	400.0		—		400.0
9.44% Series	Evergy Missouri West, Inc.	2021	1.1		—		—
Pollution Control Bonds
0.18% Series(b)	Evergy Kansas Central, Inc.	2032	45.0		45.0		—
0.18% Series(b)	Evergy Kansas Central, Inc.	2032	30.5		30.5		—
0.18% Series(b)	Evergy Kansas South, Inc.	2027	21.9		21.9		—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0		50.0		—
0.18% Series(b)	Evergy Kansas South, Inc.	2032	14.5		14.5		—
0.18% Series(b)	Evergy Kansas South, Inc.	2032	10.0		10.0		—
0.20% Series 2007A and 2007B(b)	Evergy Metro, Inc.	2035	146.5		—		146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4		—		23.4
Senior Notes
3.15% Series(g)	Evergy Metro, Inc.	2023	300.0		—		300.0
3.65% Series(g)	Evergy Metro, Inc.	2025	350.0		—		350.0
6.05% Series (5.78% rate)(a)(g)	Evergy Metro, Inc.	2035	250.0		—		250.0
5.30% Series(g)	Evergy Metro, Inc.	2041	400.0		—		400.0
4.20% Series(g)	Evergy Metro, Inc.	2047	300.0		—		300.0
4.20% Series(g)	Evergy Metro, Inc.	2048	300.0		—		300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9		—		—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0		—		—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0		—		—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0		—		—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0		—		—
4.85% Series	Evergy, Inc.(f)	2021	350.0		—		—
5.292% Series	Evergy, Inc.(f)	2022	287.5		—		—
2.45% Series	Evergy, Inc.	2024	800.0		—		—
2.90% Series (3.77% rate)(a)	Evergy, Inc.	2029	800.0		—		—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0		—		—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0		—		—
Fair value adjustment(e)			110.4		—		—
Current maturities(c)			(436.4)		—		—
Unamortized debt discount and debt issuance costs			(84.9)		(45.4)		(26.4)
Total excluding current maturities(d)			$	9,190.9	$	3,931.5	$	2,923.0


December 31, 2019	Issuing Entity	Year Due	Evergy		Evergy Kansas Central		Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0	$	250.0	$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0		250.0		—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0		350.0		—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0		300.0		—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0		550.0		—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0		430.0		—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0		250.0		—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0		300.0		—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0		300.0
6.15% Series	Evergy Kansas South, Inc.	2023	50.0		50.0		—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0		175.0		—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0		100.0		—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0		250.0		—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5		—		79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0		—		400.0
9.44% Series	Evergy Missouri West, Inc.	2020-2021	2.3		—		—
Pollution Control Bonds
1.39% Series(b)	Evergy Kansas Central, Inc.	2032	45.0		45.0		—
1.39% Series(b)	Evergy Kansas Central, Inc.	2032	30.5		30.5		—
1.39% Series(b)	Evergy Kansas South, Inc.	2027	21.9		21.9		—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0		50.0		—
1.39% Series(b)	Evergy Kansas South, Inc.	2032	14.5		14.5		—
1.39% Series(b)	Evergy Kansas South, Inc.	2032	10.0		10.0		—
1.432% Series 2007A and 2007B(b)	Evergy Metro, Inc.	2035	146.5		—		146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4		—		23.4
Senior Notes
3.15% Series(g)	Evergy Metro, Inc.	2023	300.0		—		300.0
3.65% Series(g)	Evergy Metro, Inc.	2025	350.0		—		350.0
6.05% Series (5.78% rate)(a)(g)	Evergy Metro, Inc.	2035	250.0		—		250.0
5.30% Series(g)	Evergy Metro, Inc.	2041	400.0		—		400.0
4.20% Series(g)	Evergy Metro, Inc.	2047	300.0		—		300.0
4.20% Series(g)	Evergy Metro, Inc.	2048	300.0		—		300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9		—		—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0		—		—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0		—		—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0		—		—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0		—		—
4.85% Series	Evergy, Inc.(f)	2021	350.0		—		—
5.292% Series	Evergy, Inc.(f)	2022	287.5		—		—
2.45% Series	Evergy, Inc.	2024	800.0		—		—
2.90% Series (3.77% rate)(a)	Evergy, Inc.	2029	800.0		—		—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0		—		—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0		—		—
Fair value adjustment(e)			125.5		—		—
Current maturities(c)			(251.1)		(250.0)		—
Unamortized debt discount and debt issuance costs			(80.7)		(40.8)		(24.4)
Total excluding current maturities(d)			$	8,746.7	$	3,436.1	$	2,525.0

(a)Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments.

(b)Variable rate.

(c)Evergy's current maturities total as of December 31, 2020 and 2019, includes $4.4 million and $4.3 million, respectively, of fair value adjustments recorded in connection with purchase accounting for the merger transaction.

(d)At December 31, 2020 and 2019, does not include $50.0 million and $21.9 million of secured Series 2005 Environmental Improvement Revenue Refunding (EIRR) bonds because the bonds were repurchased in September 2015 and are held by Evergy Metro.

(e)Represents the fair value adjustments recorded at Evergy consolidated related to the long-term debt of Great Plains Energy, Evergy Metro and Evergy Missouri West in connection with purchase accounting for the merger transaction. This amount is not part of future principal payments and will amortize over the remaining life of the associated debt instruments.

(f)Originally issued by Great Plains Energy but assumed by Evergy, Inc. as part of the merger transaction.

(g)Effectively secured pursuant to the General Mortgage Indenture and Deed of Trust dated as of December 1, 1986, as supplemented (Evergy Metro Mortgage Indenture) through the issuance of collateral mortgage bonds to the trustee in 2019.

The following table summarizes Evergy's and Evergy Kansas Central's long-term debt of VIEs.


		December 31
	2020			2019
		(millions)
2.398% due 2021		$	18.8		$	51.1
Current maturities		(18.8)			(32.3)

Total excluding current maturities		$	—		$	18.8

Mortgage Bonds

The Evergy Kansas Central and Evergy Kansas South mortgages each contain provisions restricting the amount of first mortgage bonds (FMBs) that could be issued by each entity. Evergy Kansas Central and Evergy Kansas South must be in compliance with such restrictions prior to the issuance of additional first mortgage bonds or other secured indebtedness. The amount of Evergy Kansas Central FMBs authorized by its Mortgage and Deed of Trust, dated July 1, 1939, as supplemented, is subject to certain limitations as described below. The amount of Evergy Kansas South FMBs authorized by the Evergy Kansas South Mortgage and Deed of Trust, dated April 1, 1940, as supplemented and amended, is limited to a maximum of $3.5 billion, unless amended further. FMBs are secured by utility assets. Amounts of additional FMBs that may be issued are subject to property, earnings and certain restrictive provisions, except in connection with certain refundings, of each mortgage. As of December 31, 2020, approximately $780.6 million and $2,828.6 million principal amounts of additional Evergy Kansas Central FMBs or Evergy Kansas South FMBs, respectively, could be issued under the most restrictive provisions of their mortgages.

Evergy Metro has issued mortgage bonds under the Evergy Metro Mortgage Indenture, which creates a mortgage lien on substantially all Evergy Metro's utility plant. Additional Evergy Metro bonds may be issued on the basis of 75% of property additions or retired bonds. As of December 31, 2020, approximately $4,733.1 million principal amount of additional Evergy Metro mortgage bonds could be issued under the most restrictive provisions in the mortgage.

Evergy Missouri West has issued mortgage bonds under the General Mortgage Indenture and Deed of Trust dated April 1, 1946, as supplemented, which creates a mortgage lien on a portion of Evergy Missouri West's utility plant.

In April 2020, Evergy Kansas Central issued, at a discount, $500.0 million of 3.45% FMBs, maturing in 2050 and issued a notice of redemption for its $250.0 million of 5.10% FMBs, which had an original maturity date of July 2020. The proceeds from the issuance of Evergy Kansas Central's $500.0 million of 3.45% FMBs were used to redeem the $250.0 million of 5.10% FMBs in May 2020 and for general corporate purposes.

In May 2020, Evergy Metro issued, at a discount, $400.0 million of 2.25% Mortgage Bonds, maturing in 2030. The proceeds from the issuance of Evergy Metro's $400.0 million of 2.25% Mortgage Bonds were used to repay a portion of Evergy Metro's borrowings under the master credit facility and for general corporate purposes.

Senior Notes

Under the terms of the note purchase agreements for certain Evergy Missouri West senior notes, Evergy Missouri West is required to maintain a consolidated indebtedness to consolidated capitalization ratio, as defined in the agreements, not greater than 0.65 to 1.00. In addition, Evergy Missouri West's priority debt, as defined in the agreements, cannot exceed 15% of consolidated tangible net worth, as defined in the agreements. At December 31, 2020, Evergy Missouri West was in compliance with these covenants.

Scheduled Maturities

Evergy's, Evergy Kansas Central's and Evergy Metro's long-term debt maturities and the long-term debt maturities of VIEs for the next five years are detailed in the following table.


	2021		2022		2023		2024		2025
	(millions)
Evergy(a)	$	432.0	$	387.5	$	439.5	$	800.0	$	636.0
Evergy Kansas Central(a)	—		—		50.0		—		250.0
Evergy Metro	—		—		379.5		—		350.0
VIEs	18.8		—		—		—		—

(a) Excludes long-term debt maturities of VIEs.

FAIR VALUE MEASUREMENTS

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Values of Financial Instruments

GAAP establishes a hierarchical framework for disclosing the transparency of the inputs utilized in measuring assets and liabilities at fair value. Management's assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of assets and liabilities within the fair value hierarchy levels. In addition, the Evergy Companies measure certain investments that do not have a readily determinable fair value at NAV, which are not included in the fair value hierarchy. Further explanation of these levels and NAV is summarized below.

Level 1 – Quoted prices are available in active markets for identical assets or liabilities. The types of assets and liabilities included in Level 1 are highly liquid and actively traded instruments with quoted prices, such as equities listed on public exchanges.

Level 2 – Pricing inputs are not quoted prices in active markets but are either directly or indirectly observable. The types of assets and liabilities included in Level 2 are certain marketable debt securities, financial instruments traded in less than active markets or other financial instruments priced with models using highly observable inputs.

Level 3 – Significant inputs to pricing have little or no transparency. The types of assets and liabilities included in Level 3 are those with inputs requiring significant management judgment or estimation.

NAV - Investments that do not have a readily determinable fair value are measured at NAV. These investments do not consider the observability of inputs and, therefore, they are not included within the fair value hierarchy. The Evergy Companies include in this category investments in private equity, real estate and alternative investment funds that do not have a readily determinable fair value. The underlying alternative investments include collateralized debt obligations, mezzanine debt and a variety of other investments.

The Evergy Companies record cash and cash equivalents, accounts receivable and short-term borrowings on their consolidated balance sheets at cost, which approximates fair value due to the short-term nature of these instruments.

Interest Rate Derivatives

The Evergy Companies are exposed to market risks arising from changes in interest rates and may use derivative instruments to manage these risks. From time to time, risk management activities may include entering into interest rate swap agreements to protect against unfavorable interest rate changes relating to forecasted debt transactions. These interest rate swap agreements can be designated as cash flow hedges, in which case gains and losses on the interest rate swaps are deferred in other comprehensive income to be recognized as an adjustment to interest expense over the same period that the hedged interest payments affect earnings. The Evergy Companies classify all cash inflows and outflows for interest rate swap agreements accounted for as cash flow hedges of forecasted debt transactions as financing activities on their consolidated statements of cash flows.

In September 2019, Evergy issued $800.0 million of 2.90% Senior Notes maturing in 2029 and paid $69.8 million to settle an interest rate swap agreement with a notional amount of $500.0 million that was designated as a cash

flow hedge of interest payments on the debt issuance. The $69.8 million pre-tax loss was recorded in accumulated other comprehensive loss on Evergy's consolidated balance sheet and is being reclassified to interest expense over the ten-year term of the debt. For 2020, $7.0 million and $(4.0) million were reclassified from accumulated other comprehensive loss to interest expense and income tax expense, respectively, on Evergy's consolidated statements of comprehensive income. For 2019, $2.0 million and $(0.5) million were reclassified from accumulated other comprehensive loss to interest expense and income tax expense, respectively, on Evergy's consolidated statements of comprehensive income. As of December 31, 2020, Evergy expects to amortize $5.4 million to earnings from accumulated other comprehensive loss over the next twelve months.

Fair Value of Long-Term Debt

The Evergy Companies measure the fair value of long-term debt using Level 2 measurements available as of the measurement date. The book value and fair value of the Evergy Companies' long-term debt and long-term debt of variable interest entities is summarized in the following table.


	December 31
	2020				2019
	Book Value		Fair Value		Book Value		Fair Value
Long-term debt(a)	(millions)
Evergy(b)	$	9,627.3	$	11,274.2	$	8,997.8	$	9,750.2
Evergy Kansas Central	3,931.5		4,801.7		3,686.1		4,078.8
Evergy Metro	2,923.0		3,591.2		2,525.0		2,932.2
Long-term debt of variable interest entities(a)
Evergy	$	18.8	$	19.1	$	51.1	$	51.5
Evergy Kansas Central	18.8		19.1		51.1		51.5

(a) Includes current maturities.

(b) Book value as of December 31, 2020 and 2019, includes $110.4 million and $125.5 million, respectively, of fair value adjustments recorded in connection with purchase accounting for the Great Plains Energy and Evergy Kansas Central merger, which are not part of future principal payments and will amortize over the remaining life of the associated debt instrument.

Recurring Fair Value Measurements

The following tables include the Evergy Companies' balances of financial assets and liabilities measured at fair value on a recurring basis.


Description	December 31, 2020			Level 1		Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust(a)
Domestic equity funds		$	102.7	$	95.1		$	—		$	—		$	7.6
International equity funds		63.8		63.8			—			—			—
Core bond fund		40.6		40.6			—			—			—
High-yield bond fund		25.0		25.0			—			—			—
Emerging markets bond fund		21.0		21.0			—			—			—
Combination debt/equity/other fund		20.1		20.1			—			—			—
Alternative investments fund		23.2		—			—			—			23.2
Real estate securities fund		12.9		—			—			—			12.9
Cash equivalents		0.5		0.5			—			—			—
Total nuclear decommissioning trust		309.8		266.1			—			—			43.7
Rabbi trust
Core bond fund		25.6		—			—			—			25.6
Combination debt/equity/other fund		7.1		—			—			—			7.1

Total rabbi trust		32.7		—			—			—			32.7
Total		$	342.5	$	266.1		$	—		$	—		$	76.4
Evergy Metro
Assets
Nuclear decommissioning trust(a)
Equity securities		$	243.1	$	243.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		47.7		47.7			—			—			—
U.S. Agency		0.5		—			0.5			—			—
State and local obligations		4.1		—			4.1			—			—
Corporate bonds		43.1		—			43.1			—			—
Foreign governments		0.1		—			0.1			—			—
Cash equivalents		3.2		3.2			—			—			—
Other		0.5		0.5			—			—			—
Total nuclear decommissioning trust		342.3		294.5			47.8			—			—
Self-insured health plan trust(b)
Equity securities		1.7		1.7			—			—			—
Debt securities		8.0		2.8			5.2			—			—
Cash and cash equivalents		3.5		3.5			—			—			—
Total self-insured health plan trust		13.2		8.0			5.2			—			—
Total		$	355.5	$	302.5		$	53.0		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.1	$	—		$	—		$	—		$	13.1
Cash and cash equivalents		0.5		0.5			—			—			—
Total rabbi trusts		$	13.6	$	0.5		$	—		$	—		$	13.1



Evergy
Assets
Nuclear decommissioning trust(a)		$	652.1	$	560.6		$	47.8		$	—		$	43.7
Rabbi trusts		46.3		0.5			—			—			45.8
Self-insured health plan trust(b)		13.2		8.0			5.2			—			—
Total		$	711.6	$	569.1		$	53.0		$	—		$	89.5


Description	December 31, 2019			Level 1			Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust(a)
Domestic equity funds		$	86.1		$	78.6		$	—		$	—		$	7.5
International equity funds		52.0			52.0			—			—			—
Core bond fund		39.3			39.3			—			—			—
High-yield bond fund		22.3			22.3			—			—			—
Emerging markets bond fund		19.4			19.4			—			—			—
Combination debt/equity/other fund		16.4			16.4			—			—			—
Alternative investments fund		23.9			—			—			—			23.9
Real estate securities fund		12.6			—			—			—			12.6
Cash equivalents		0.5			0.5			—			—			—
Total nuclear decommissioning trust		272.5			228.5			—			—			44.0
Rabbi trust
Core bond fund		25.3			—			—			—			25.3
Combination debt/equity/other fund		6.3			—			—			—			6.3
Cash equivalents		0.1			0.1			—			—			—
Total rabbi trust		31.7			0.1			—			—			31.6
Total		$	304.2		$	228.6		$	—		$	—		$	75.6
Evergy Metro
Assets
Nuclear decommissioning trust(a)
Equity securities		$	211.1		$	211.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		50.3			50.3			—			—			—
U.S. Agency		0.4			—			0.4			—			—
State and local obligations		2.2			—			2.2			—			—
Corporate bonds		33.2			—			33.2			—			—
Foreign governments		0.1			—			0.1			—			—
Cash equivalents		3.1			3.1			—			—			—
Other		0.3			—			0.3			—			—
Total nuclear decommissioning trust		300.7			264.5			36.2			—			—
Self-insured health plan trust(b)
Equity securities		0.5			0.5			—			—			—
Debt securities		6.7			1.4			5.3			—			—
Cash and cash equivalents		2.7			2.7			—			—			—
Total self-insured health plan trust		9.9			4.6			5.3			—			—
Total		$	310.6		$	269.1		$	41.5		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.3		$	—		$	—		$	—		$	13.3
Cash and cash equivalents		0.5			0.5			—			—			—
Total rabbi trusts		$	13.8		$	0.5		$	—		$	—		$	13.3



Evergy
Assets
Nuclear decommissioning trust(a)		$	573.2		$	493.0		$	36.2		$	—		$	44.0
Rabbi trust		45.5			0.6			—			—			44.9
Self-insured health plan trust(b)		9.9			4.6			5.3			—			—
Total		$	628.6		$	498.2		$	41.5		$	—		$	88.9

(a)Fair value is based on quoted market prices of the investments held by the trust and/or valuation models.

(b)Fair value is based on quoted market prices of the investments held by the trust. Debt securities classified as Level 1 are comprised of U.S. Treasury securities. Debt securities classified as Level 2 are comprised of corporate bonds, U.S. Agency, state and local obligations, and other asset-backed securities.

Certain Evergy and Evergy Kansas Central investments included in the table above are measured at NAV as they do not have readily determinable fair values. In certain situations, these investments may have redemption restrictions.

The following table provides additional information on these Evergy and Evergy Kansas Central investments.


	December 31, 2020				December 31, 2019				December 31, 2020
	Fair		Unfunded		Fair		Unfunded		Redemption	Length of
	Value		Commitments		Value		Commitments		Frequency	Settlement
Evergy Kansas Central
Nuclear decommissioning trust:	(millions)
Domestic equity funds	$	7.6	$	2.2	$	7.5	$	3.3	(a)	(a)
Alternative investments fund(b)	23.2		—		23.9		—		Quarterly	65 days
Real estate securities fund(b)	12.9		—		12.6		—		Quarterly	65 days
Total	$	43.7	$	2.2	$	44.0	$	3.3
Rabbi trust:
Core bond fund	$	25.6	$	—	$	25.3	$	—	(c)	(c)
Combination debt/equity/other fund	7.1		—		6.3		—		(c)	(c)
Total	$	32.7	$	—	$	31.6	$	—
Other Evergy
Rabbi trust:
Fixed income fund	$	13.1	$	—	$	13.3	$	—	(c)	(c)
Total Evergy investments at NAV	$	89.5	$	2.2	$	88.9	$	3.3

(a)This investment is in five long-term private equity funds that do not permit early withdrawal. Investments in these funds cannot be distributed until the underlying investments have been liquidated, which may take years from the date of initial liquidation. Three funds have begun to make distributions. The initial investment in the fourth and fifth funds occurred in 2016 and 2018, respectively. The fourth fund's term is 15 years, subject to the general partner's right to extend the term for up to three additional one-year periods. The fifth fund's term is 15 years, subject to additional extensions approved by a fund advisory committee to provide for an orderly liquidation of fund investments and dissolution of the fund.

(b)There is a holdback on final redemptions.

(c)This investment can be redeemed immediately and is not subject to any restrictions on redemptions.

The Evergy Companies hold equity and debt investments classified as securities in various trusts including for the purposes of funding the decommissioning of Wolf Creek and for the benefit of certain retired executive officers of Evergy Kansas Central. The Evergy Companies record net realized and unrealized gains and losses on the nuclear decommissioning trusts in regulatory liabilities on their consolidated balance sheets and record net realized and unrealized gains and losses on the Evergy Companies' rabbi trusts in the consolidated statements of income and comprehensive income.

The following table summarizes the net unrealized gains (losses) for the Evergy Companies' nuclear decommissioning trusts and rabbi trusts.



	2020		2019		2018
Evergy	(millions)
Nuclear decommissioning trust - equity securities	$	45.5	$	74.0	(54.1)
Nuclear decommissioning trust - debt securities	5.3		5.1		(0.5)
Rabbi trusts - equity securities	(5.6)		3.1		1.0
Total	$	45.2	$	82.2	$	(53.6)
Evergy Kansas Central
Nuclear decommissioning trust - equity securities	$	21.9	$	33.3	(31.8)
Rabbi trust - equity securities	(6.1)		3.2		1.0
Total	$	15.8	$	36.5	$	(30.8)
Evergy Metro(a)
Nuclear decommissioning trust - equity securities	$	23.6	$	40.7	(20.7)
Nuclear decommissioning trust - debt securities	5.3		5.1		(2.5)
Total	$	28.9	$	45.8	$	(23.2)

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

COMMITMENTS AND CONTINGENCIES

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Environmental Matters

Set forth below are descriptions of contingencies related to environmental matters that may impact the Evergy Companies' operations or their financial results. Management's assessment of these contingencies, which are based on federal and state statutes and regulations, and regulatory agency and judicial interpretations and actions, has evolved over time. These laws, regulations, interpretations and actions can also change, restrict or otherwise impact the Evergy Companies' operations or financial results. The failure to comply with these laws, regulations, interpretations and actions could result in the assessment of administrative, civil and criminal penalties and/or the imposition of remedial requirements. The Evergy Companies believe that all of their operations are in substantial compliance with current federal, state and local environmental standards.

There are a variety of final and proposed laws and regulations that could have a material adverse effect on the Evergy Companies' operations and consolidated financial results. Due in part to the complex nature of environmental laws and regulations, the Evergy Companies are unable to assess the impact of potential changes that may develop with respect to the environmental contingencies described below.

Cross-State Air Pollution Update Rule

In September 2016, the Environmental Protection Agency (EPA) finalized the Cross-State Air Pollution (CSAPR) Update Rule. The final rule addresses interstate transport of nitrogen oxides emissions in 22 states including Kansas, Missouri and Oklahoma during the ozone season and the impact from the formation of ozone on downwind states with respect to the 2008 ozone National Ambient Air Quality Standards (NAAQS). In December 2018, the EPA finalized a determination, known as the CSAPR Close-Out Rule, demonstrating the CSAPR Update Rule fully addressed certain upwind states' 2008 ozone NAAQS interstate transport obligations. Various states and others have challenged both the CSAPR Update Rule and the CSAPR Close-Out Rule in the U.S. Court of Appeals for the D.C. Circuit (D.C. Circuit). In the fourth quarter of 2019, the D.C. Circuit granted these petitions and remanded a portion of the CSAPR Update Rule back to the EPA and vacated the CSAPR Close-Out Rule in its entirety.

In response to the remand by the D.C. Circuit, the EPA proposed the Revised Cross-State Air Pollution Rule Update for the 2008 Ozone NAAQS in October 2020. The proposal finds that nine of the states that were subject to the CSAPR Update Rule do not significantly contribute to downwind states' nonattainment and/or maintenance issues during the ozone season, and that these states are therefore currently not subject to this proposed rule. These nine states are Alabama, Arkansas, Iowa, Kansas, Mississippi, Missouri, Oklahoma, Texas and Wisconsin. The Evergy

Companies will continue to monitor this proposed rule as any future changes to their NOx ozone season allowance allocations could be material.

Greenhouse Gases

Burning coal and other fossil fuels releases carbon dioxide (CO2) and other gases referred to as greenhouse gases (GHG). Various regulations under the federal Clean Air Act Amendments of 1990 (CAA) limit CO2 and other GHG emissions, and in addition, other measures are being imposed or offered by individual states, municipalities and regional agreements with the goal of reducing GHG emissions.

In July 2019, the EPA published the final Affordable Clean Energy (ACE) rule in the Federal Register. This rule contained (1) emission guidelines for GHG emissions from existing electric utility generating units (EGUs) and (2) revisions to emission guideline implementing regulations. This rule defined the "best system of emission reduction" (BSER) for GHG emissions from existing coal-fired EGUs as on-site, heat-rate efficiency improvements. The final rule also provided states with a list of candidate technologies that can be used to establish standards of performance and incorporate these performance standards into state plans. In conjunction with the finalization of the ACE rule, the EPA repealed its previously adopted Clean Power Plan (CPP). In January 2021, the D.C. Circuit vacated and remanded the ACE rule back to the EPA. Absent an approved request for rehearing, the mandate becomes effective on March 12, 2021. In February 2021, the D.C. Circuit granted a motion filed by the EPA for a partial stay of its January 2021 vacatur discussed above. The partial stay leaves the vacatur of the ACE rule in place while staying the mandate that vacates the repeal of the CPP. As a result of the partial stay, neither the ACE rule nor the CPP will be in effect while the EPA forms a new rule to regulate greenhouse gas emissions.

Due to uncertainty regarding the future of the CPP or any other GHG regulation, the Evergy Companies cannot determine the impact of the rule on their operations or consolidated financial results, but the cost to comply with the ACE rule, CPP, or other potential GHG rule, could be material.

Water

The Evergy Companies discharge some of the water used in generation and other operations containing substances deemed to be pollutants. A November 2015 EPA rule establishes effluent limitations guidelines (ELG) and standards for wastewater discharges, including limits on the amount of toxic metals and other pollutants that can be discharged. Implementation timelines for this 2015 rule vary from 2018 to 2023. In April 2019, the U.S. Court of Appeals for the 5th Circuit (5th Circuit) issued a ruling that vacates and remands portions of the original ELG rule. Due to this ruling, future ELG modifications for the best available technology economically achievable for the discharge of legacy wastewater and leachate are likely and could be material.

In October 2020, the EPA published the final ELG reconsideration rule. This rule adjusts numeric limits for flue gas desulfurization (FGD) wastewater and adds a 10% volumetric purge limit for bottom ash transport water. The timeline for final FGD wastewater compliance is now as soon as possible on or after one year following publication of the final rule in the Federal Register but no later than December 31, 2025. The Evergy Companies have reviewed the regulation and the costs to comply with these changes are not expected to be material.

Regulation of Coal Combustion Residuals

In the course of operating their coal generation plants, the Evergy Companies produce coal combustion residuals (CCRs), including fly ash, gypsum and bottom ash. The EPA published a rule to regulate CCRs in April 2015 that requires additional CCR handling, processing and storage equipment and closure of certain ash disposal units.

In March 2019, the D.C. Circuit issued a ruling to grant the EPA's request to remand the Phase I, Part I CCR rule in response to a prior court ruling requiring the EPA to address un-lined surface impoundment closure requirements. In August 2020, the EPA published the Part A CCR Rule. This rule reclassified clay-lined surface impoundments from "lined" to "un-lined" and established a deadline of April 11, 2021 to initiate closure. The prior rule included a deadline of October 31, 2020 for un-lined impoundments to initiate closure. In November 2020, the EPA published the final Part B CCR Rule. This rule includes a process to allow un-lined impoundments to continue to operate if a demonstration is made to prove that the un-lined impoundments are not adversely impacting groundwater, human

health or the environment. The Evergy Companies currently plan to initiate closure of all un-lined impoundments by the deadline in the Part A CCR rule and therefore the Part B CCR rule is not expected to have a material impact.

The Evergy Companies have recorded AROs for their current estimates for the closure of ash disposal ponds, but the revision of these AROs may be required in the future due to changes in existing CCR regulations, the results of groundwater monitoring of CCR units or changes in interpretation of existing CCR regulations or changes in the timing or cost to close ash disposal ponds. If revisions to these AROs are necessary, the impact on the Evergy Companies' operations or consolidated financial results could be material.

Storage of Spent Nuclear Fuel

Under the Nuclear Waste Policy Act of 1982, the Department of Energy (DOE) is responsible for the permanent disposal of spent nuclear fuel. In 2010, the DOE filed a motion with the Nuclear Regulatory Commission (NRC) to withdraw its application to construct a national repository for the disposal of spent nuclear fuel and high-level radioactive waste at Yucca Mountain, Nevada. The NRC has not yet issued a final decision on the matter.

Wolf Creek is constructing a dry cask storage facility to expand its existing on-site spent nuclear fuel storage, which is expected to provide additional capacity by the end of 2021. The Evergy Companies expect that the majority of the costs to construct the dry cask storage facility that would not have otherwise been incurred had the DOE begun accepting spent nuclear fuel will be reimbursed by the DOE. The Evergy Companies cannot predict, when, or if, an off-site storage site or alternative disposal site will be available to receive Wolf Creek's spent nuclear fuel and will continue to monitor this activity.

Nuclear Insurance

Nuclear liability, property and accidental outage insurance is maintained for Wolf Creek. These policies contain certain industry standard terms, conditions and exclusions, including, but not limited to, ordinary wear and tear and war. An industry aggregate limit of $3.2 billion for nuclear events ($1.8 billion of non-nuclear events) plus any reinsurance, indemnity or any other source recoverable by Nuclear Electric Insurance Limited (NEIL), provider of property and accidental outage insurance, exists for acts of terrorism affecting Wolf Creek or any other NEIL insured plant within 12 months from the date of the first act. In addition, participation is required in industry-wide retrospect assessment programs as discussed below.

Nuclear Liability Insurance

Pursuant to the Price-Anderson Act, liability insurance includes coverage against public nuclear liability claims resulting from nuclear incidents to the required limit of public liability, which is approximately $13.8 billion. This limit of liability consists of the maximum available commercial insurance of $0.5 billion and the remaining $13.3 billion is provided through mandatory participation in an industry-wide retrospective assessment program. Under this retrospective assessment program, the owners of Wolf Creek are jointly and severally subject to an assessment of up to $137.6 million (Evergy's share is $129.4 million and each of Evergy Kansas Central's and Evergy Metro's is $64.7 million), payable at no more than $20.5 million (Evergy's share is $19.2 million and each of Evergy Kansas Central's and Evergy Metro's is $9.6 million) per incident per year per reactor for any commercial U.S. nuclear reactor qualifying incident. Both the total and yearly assessment is subject to an inflationary adjustment based on the Consumer Price Index and applicable premium taxes. In addition, the U.S. Congress could impose additional revenue-raising measures to pay claims.

Nuclear Property and Accidental Outage Insurance

The owners of Wolf Creek carry decontamination liability, nuclear property damage and premature nuclear decommissioning liability insurance for Wolf Creek totaling approximately $2.8 billion. Insurance coverage for non-nuclear property damage accidents total approximately $2.3 billion. In the event of an extraordinary nuclear accident, insurance proceeds must first be used for reactor stabilization and site decontamination in accordance with a plan mandated by the NRC. The Evergy Companies' share of any remaining proceeds can be used to pay for property damage or, if certain requirements are met, including decommissioning the plant, toward a shortfall in the nuclear decommissioning trust fund. The owners also carry additional insurance with NEIL to help cover costs of replacement power and other extra expenses incurred during a prolonged outage resulting from accidental property damage at Wolf Creek. If significant losses were incurred at any of the nuclear plants insured under the NEIL

policies, the owners of Wolf Creek may be subject to retrospective assessments under the current policies of approximately $33.2 million (Evergy's share is $31.2 million and each of Evergy Kansas Central's and Evergy Metro's is $15.6 million).

Nuclear Insurance Considerations

Although the Evergy Companies maintain various insurance policies to provide coverage for potential losses and liabilities resulting from an accident or an extended outage, the insurance coverage may not be adequate to cover the costs that could result from a catastrophic accident or extended outage at Wolf Creek. Any substantial losses not covered by insurance, to the extent not recoverable in prices, would have a material effect on the Evergy Companies' consolidated financial results.

Contractual Commitments - Fuel, Power and Other

The Evergy Companies' contractual commitments at December 31, 2020, excluding pensions, long-term debt and leases, are detailed in the following tables. See Notes 10, 13 and 21 for information regarding pension, long-term debt and lease commitments, respectively.


Evergy
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	311.2	$	118.3	$	134.6	$	97.6	$	88.4		$	94.0		$	844.1
Power	62.4		62.6		63.2		57.6		58.0			349.7			653.5
Other	135.4		25.7		19.3		23.6		21.9			86.0			311.9
Total contractual commitments	$	509.0	$	206.6	$	217.1	$	178.8	$	168.3		$	529.7		$	1,809.5


Evergy Kansas Central
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	149.3	$	74.9	$	85.5	$	66.8	$	62.3		$	56.0		$	494.8
Power	1.4		0.9		0.9		0.9		0.9			4.4			9.4
Other	66.6		9.1		8.2		4.3		2.9			—			91.1
Total contractual commitments	$	217.3	$	84.9	$	94.6	$	72.0	$	66.1		$	60.4		$	595.3


Evergy Metro
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	142.8	$	38.8	$	46.3	$	27.9	$	23.2		$	38.0		$	317.0
Power	34.9		35.1		35.3		29.2		29.2			196.1			359.8
Other	55.0		15.2		10.1		18.8		18.5			81.4			199.0
Total contractual commitments	$	232.7	$	89.1	$	91.7	$	75.9	$	70.9		$	315.5		$	875.8

Fuel commitments consist of commitments for nuclear fuel, coal and coal transportation. Power commitments consist of certain commitments for renewable energy under power purchase agreements, capacity purchases and firm transmission service. Other represents individual commitments entered into in the ordinary course of business.

GUARANTEES	12 Months Ended
GUARANTEES	Dec. 31, 2020
Guarantees [Abstract]
GUARANTEES	GUARANTEESIn the ordinary course of business, Evergy and certain of its subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include, for example, guarantees and letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiary's intended business purposes. The majority of these agreements guarantee Evergy's own future performance, so a liability for the fair value of the obligation is not recorded. At December 31, 2020, Evergy has provided $140.0 million of credit support for certain of its subsidiaries as follows: •Evergy direct guarantees to Evergy Kansas Central and Evergy Metro counterparties for certain fuel supply contracts totaling $48.0 million, which expire in 2027; and •Evergy's guarantee of Evergy Missouri West long-term debt totaling $92.0 million, which includes debt with maturity dates ranging from 2021 to 2023. Evergy has also guaranteed Evergy Missouri West's commercial paper program. At December 31, 2020, Evergy Missouri West had $65.0 million of commercial paper outstanding. None of the guaranteed obligations are subject to default or prepayment if Evergy Missouri West's credit ratings were downgraded.

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS

12 Months Ended

Dec. 31, 2020

In the normal course of business, Evergy Kansas Central, Evergy Metro and Evergy Missouri West engage in related party transactions with one another. A summary of these transactions and the amounts associated with them is provided below.

Jointly-Owned Plants and Shared Services

Employees of Evergy Kansas Central and Evergy Metro manage Evergy Missouri West's business and operate its facilities at cost, including Evergy Missouri West's 18% ownership interest in Evergy Metro's Iatan Nos. 1 and 2. Employees of Evergy Kansas Central manage Jeffrey Energy Center (JEC) and operate its facilities at cost, including Evergy Missouri West's 8% ownership interest in JEC. Employees of Evergy Metro manage La Cygne Station and operate its facilities at cost, including Evergy Kansas Central's 50% interest in La Cygne Station. Employees of Evergy Metro and Evergy Kansas Central also provide one another with shared service support, including costs related to human resources, information technology, accounting and legal services.

The operating expenses and capital costs billed for jointly-owned plants and shared services are detailed in the following table.



	2020		2019		2018
	(millions)
Evergy Kansas Central billings to Evergy Missouri West(a)	$	37.6	$	24.9	$	12.3
Evergy Metro billings to Evergy Missouri West	168.7		172.8		183.2
Evergy Kansas Central billings to Evergy Metro(a)	34.7		40.6		17.5
Evergy Metro billings to Evergy Kansas Central(a)	130.8		154.9		82.9

(a)Transactions between Evergy Kansas Central and either Evergy Metro or Evergy Missouri West are included from June 4, 2018, the date of

the closing of the merger, and thereafter.

Money Pool

Evergy Metro and Evergy Missouri West are authorized to participate in the Evergy, Inc. money pool, which is an internal financing arrangement in which funds may be lent on a short-term basis to Evergy Metro and Evergy Missouri West from Evergy, Inc. and between Evergy Metro and Evergy Missouri West. At December 31, 2020, Evergy Metro had a $100.0 million outstanding receivable from Evergy Missouri West and no outstanding payables under the money pool. At December 31, 2019, Evergy Metro had no outstanding receivables or payables under the money pool.

Related Party Net Receivables and Payables

The following table summarizes Evergy Kansas Central's and Evergy Metro's related party net receivables and payables.


	December 31

	2020		2019
Evergy Kansas Central	(millions)
Net receivable from Evergy	$	0.1	$	6.9
Net payable to Evergy Metro	(21.7)		(14.9)
Net receivable from Evergy Missouri West	6.6		3.1

Evergy Metro
Net receivable from (payable to) Evergy	$	15.7	$	(4.3)
Net receivable from Evergy Kansas Central	21.7		14.9
Net receivable from Evergy Missouri West	188.1		78.7

Tax Allocation Agreement

Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. The following table summarizes Evergy Kansas Central's and Evergy Metro's income taxes receivable from (payable to) Evergy.


	December 31

	2020		2019
Evergy Kansas Central	(millions)
Income taxes receivable from Evergy	$	25.3	$	37.9

Evergy Metro
Income taxes receivable from (payable to) Evergy	$	3.2	$	(14.1)

Leases

Evergy Metro leases certain transmission equipment from Evergy Kansas Central. This lease was entered into prior to the merger in an arms-length transaction and is accounted for as an operating lease. The right-of-use asset related to this lease is recorded within other long-term assets and the current and long-term lease liabilities are recorded within other current liabilities and other long-term liabilities, respectively, on the consolidated balance sheet. The assets and liabilities related to this lease between Evergy Kansas Central and Evergy Metro are eliminated at consolidated Evergy. The following table summarizes Evergy Metro's right-of-use assets and related liabilities on its consolidated balance sheet.


	December 31

	2020		2019
Evergy Metro	(millions)
Right-of-use asset recorded within other long-term assets	$	28.9	$	29.5
Lease liability recorded in other current liabilities	0.7		0.6
Lease liability recorded in other long-term liabilities	28.2		28.9

SHAREHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY Evergy's authorized capital stock consists of 600 million shares of common stock, without par value, and 12 million shares of Preference Stock, without par value.

Evergy Registration Statements

In November 2018, Evergy filed an automatic shelf registration statement providing for the sale of unlimited amounts of securities with the SEC, which expires in November 2021.

Evergy has registered shares of its common stock with the SEC for its Dividend Reinvestment and Direct Stock Purchase Plan. Shares issued under the plan may be either newly issued shares or shares purchased on the open market.

Evergy has registered shares of its common stock with the SEC for the Evergy, Inc. 401(k) Savings Plan. Shares issued under the plans may be either newly issued shares or shares purchased on the open market.

Securities Purchase Agreement

On February 25, 2021, Evergy entered into a securities purchase agreement, by and between Evergy and an affiliate of Bluescape Energy Partners, LLC (Bluescape). Bluescape has agreed to purchase 2,269,447 shares of Evergy’s common stock for approximately $113.2 million and will receive a warrant to purchase up to 3,950,000 additional shares of Evergy’s common stock, in each case subject to satisfaction of customary closing conditions, including the expiration of the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976. The warrant will have a term of three years and an exercise price equal to $64.70.

Common Stock Repurchase Program

In July 2018, the Evergy Board authorized the repurchase of up to 60 million shares of Evergy's common stock with no expiration date. Following its authorization, Evergy utilized various methods to effectuate the share repurchase program, including the repurchase of shares through accelerated share repurchase (ASR) agreements and open market transactions. In total, Evergy repurchased $2,671.0 million, or 45.2 million shares, of common stock under the repurchase program. Evergy retires repurchased common stock shares in the period the shares are repurchased.

The following table summarizes the ASRs completed as part of Evergy's common stock repurchase program.


Date ASR Entered	Final Settlement Date	Amount		Shares Delivered
		(millions)
August 2018	October/November 2018	$	450.0	7.9
November 2018	February 2019	475.0		8.3
March 2019	June 2019	450.0		7.8
June 2019	September 2019	500.0		8.1
September 2019	November/December 2019	500.0		7.8

Under the ASR agreements entered into with various financial institutions, Evergy was delivered a number of shares of its common stock based on the amount of the ASR agreement and the average daily volume-weighted average price of its common stock during the term of the ASR agreement, less a negotiated discount. Evergy reflects ASRs as a repurchase of common stock in the period the shares are delivered for purposes of calculating earnings per share and as forward contracts indexed to its own common stock. Evergy's ASRs met all of the applicable criteria for equity classification and therefore were not accounted for as derivative instruments.

Dividend Restrictions

Evergy depends on its subsidiaries to pay dividends on its common stock. The Evergy Companies have certain restrictions stemming from statutory requirements, corporate organizational documents, covenants and other conditions that could affect dividend levels or the ability to pay dividends.

The KCC order authorizing the merger transaction requires Evergy to maintain consolidated common equity of at least 35% of total consolidated capitalization.

Under the Federal Power Act, Evergy Kansas Central, Evergy Metro and Evergy Missouri West generally can pay dividends only out of retained earnings. Certain conditions in the MPSC and KCC orders authorizing the merger

transaction also require Evergy Kansas Central and Evergy Metro to maintain consolidated common equity of at least 40% of total capitalization. Other conditions in the MPSC and KCC merger orders require Evergy Kansas Central, Evergy Metro and Evergy Missouri West to maintain credit ratings of at least investment grade. If Evergy Kansas Central's, Evergy Metro's or Evergy Missouri West's credit ratings are downgraded below the investment grade level as a result of their affiliation with Evergy or any of Evergy's affiliates, the impacted utility shall not pay a dividend to Evergy without KCC or MPSC approval or until the impacted utility's investment grade credit rating has been restored.

The master credit facility of Evergy, Evergy Kansas Central, Evergy Metro and Evergy Missouri West and the note purchase agreements for certain Evergy Missouri West senior notes contain covenants requiring the respective company to maintain a consolidated indebtedness to consolidated total capitalization ratio of not more than 0.65 to 1.00 at all times.

As of December 31, 2020, all of Evergy's and Evergy Kansas Central's retained earnings and net income were free of restrictions and Evergy Metro had a retained earnings restriction of $385.6 million. As of December 31, 2020, Evergy's subsidiaries had restricted net assets of approximately $5.7 billion. These restrictions are not expected to affect the Evergy Companies' ability to pay dividends at the current level for the foreseeable future.

VARIABLE INTEREST ENTITIES

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

VARIABLE INTEREST ENTITIES

In determining the primary beneficiary of a VIE, the Evergy Companies assess the entity's purpose and design, including the nature of the entity's activities and the risks that the entity was designed to create and pass through to its variable interest holders. A reporting enterprise is deemed to be the primary beneficiary of a VIE if it has (a) the power to direct the activities of the VIE that most significantly impact the VIE's economic performance and (b) the obligation to absorb losses or right to receive benefits from the VIE that could potentially be significant to the VIE. The primary beneficiary of a VIE is required to consolidate the VIE. The trust holding an 8% interest in JEC was a VIE until the expiration of a purchase option in July 2017 and then became a VIE again during 2019 until the 8% interest was purchased by Evergy Kansas Central in August 2019. The trust holding Evergy Kansas Central's 50% interest in La Cygne Unit 2 is a VIE and Evergy Kansas Central remains the primary beneficiary of the trust.

All involvement with entities by the Evergy Companies is assessed to determine whether such entities are VIEs and, if so, whether or not the Evergy Companies are the primary beneficiaries of the entities. The Evergy Companies also continuously assess whether they are the primary beneficiary of the VIE with which they are involved. Prospective changes in facts and circumstances may cause identification of the primary beneficiary to be reconsidered.

8% Interest in JEC

Under an agreement that expired in August 2019, Evergy Kansas Central leased an 8% interest in JEC from a trust. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 8% interest in JEC and lease it to a third party and did not hold any other assets. Evergy Kansas Central met the requirements to be considered the primary beneficiary of the trust until July 2017, when a contractual option to purchase the 8% interest in the plant covered by the lease expired. Accordingly, Evergy Kansas Central deconsolidated the trust in 2017. Evergy Kansas Central then reconsolidated the trust as a VIE in the first quarter of 2019 following an agreement with the owner to purchase the 8% interest in JEC from the trust in August 2019. Evergy Kansas Central deconsolidated the trust for the final time following the closing of this purchase in August 2019.

50% Interest in La Cygne Unit 2

Under an agreement that expires in September 2029, Evergy Kansas Central entered into a sale-leaseback transaction with a trust under which the trust purchased Evergy Kansas Central's 50% interest in La Cygne Unit 2 and subsequently leased it back to Evergy Kansas Central. The trust was financed with an equity contribution from an owner participant and debt issued by the trust. The trust was created specifically to purchase the 50% interest in La Cygne Unit 2 and lease it back to Evergy Kansas Central and does not hold any other assets. Evergy Kansas Central meets the requirements to be considered the primary beneficiary of the trust. In determining the primary

beneficiary of the trust, Evergy Kansas Central concluded that the activities of the trust that most significantly impact its economic performance and that Evergy Kansas Central has the power to direct include (1) the operation and maintenance of the 50% interest in La Cygne Unit 2 and (2) Evergy Kansas Central's ability to exercise a purchase option at the end of the agreement at the lesser of fair value or a fixed amount. Evergy Kansas Central has the potential to receive benefits from the trust that could potentially be significant if the fair value of the 50% interest in La Cygne Unit 2 at the end of the agreement is greater than the fixed amount.

The following table summarizes the assets and liabilities related to the VIE described above that are recorded on Evergy's and Evergy Kansas Central's consolidated balance sheets.


	December 31
	2020		2019
Assets:	(millions)
Property, plant and equipment of variable interest entities, net	$	154.9	$	162.0
Liabilities:
Current maturities of long-term debt of variable interest entities	$	18.8	$	32.3
Accrued interest(a)	0.1		0.3
Long-term debt of variable interest entities, net	—		18.8

(a)Included in accrued interest on Evergy's and Evergy Kansas Central's consolidated balance sheets.

All of the liabilities noted in the table above relate to the purchase of the property, plant and equipment of the VIE. The assets of the VIE can be used only to settle obligations of the VIE and the VIE's debt holders have no recourse to the general credit of Evergy and Evergy Kansas Central. Evergy and Evergy Kansas Central have not provided financial or other support to the VIE and are not required to provide such support. Evergy and Evergy Kansas Central did not record any gain or loss upon the initial consolidation of the VIE.

TAXES

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

TAXES

Components of income tax expense are detailed in the following tables.


Evergy	2020		2019		2018
Current income taxes	(millions)
Federal	$	(26.8)	$	(39.5)	$	(67.4)
State	2.1		15.0		2.2
Total	(24.7)		(24.5)		(65.2)
Deferred income taxes
Federal	73.1		93.2		160.1
State	59.8		27.5		(32.3)
Total	132.9		120.7		127.8





Investment tax credit
Deferral	—		5.2		—
Amortization	(6.0)		(4.4)		(3.6)
Total	(6.0)		0.8		(3.6)
Income tax expense	$	102.2	$	97.0	$	59.0


Evergy Kansas Central	2020		2019		2018
Current income taxes	(millions)
Federal	$	14.5	$	37.9	$	(0.3)
State	(5.3)		2.6		(1.8)
Total	9.2		40.5		(2.1)
Deferred income taxes
Federal	(16.7)		(8.9)		43.5
State	168.1		18.4		(42.9)
Total	151.4		9.5		0.6




Investment tax credit
Deferral	—		5.2		—
Amortization	(4.8)		(3.1)		(2.8)
Total	(4.8)		2.1		(2.8)
Income tax expense (benefit)	$	155.8	$	52.1	$	(4.3)


Evergy Metro(a)	2020		2019		2018
Current income taxes	(millions)
Federal	$	(0.2)	$	43.9	$	29.8
State	10.8		22.4		8.9
Total	10.6		66.3		38.7
Deferred income taxes
Federal	29.8		(24.5)		(3.4)
State	(32.2)		(5.0)		53.0
Total	(2.4)		(29.5)		49.6




Investment tax credit

Amortization	(1.1)		(1.1)		(1.0)
Total	(1.1)		(1.1)		(1.0)
Income tax expense	$	7.1	$	35.7	$	87.3

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Effective Income Tax Rates

Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.


Evergy	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(1.6)		(1.8)		(1.9)
State income taxes	4.3		5.0		4.9
Flow through depreciation for plant-related differences	(5.3)		(4.5)		0.8
Federal tax credits	(4.6)		(4.9)		(6.4)
Non-controlling interest	(0.3)		(0.4)		(0.4)
AFUDC equity	(0.5)		(0.1)		(0.1)
Amortization of federal investment tax credits	(0.6)		(0.5)		(0.6)
Changes in uncertain tax positions, net	—		(0.2)		0.1
Federal or state tax rate change	1.9		—		(8.7)
Valuation allowance	(0.2)		(1.0)		0.4
Stock compensation	(0.1)		0.1		(0.4)
Officer compensation limitation	0.2		0.1		1.2
Other	(0.2)		(0.4)		(0.2)
Effective income tax rate	14.0	%	12.4	%	9.7	%


Evergy Kansas Central	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(2.8)		(3.3)		(3.3)
State income taxes	3.8		5.3		5.0
Flow through depreciation for plant-related differences	(0.1)		(0.1)		1.6
Federal tax credits	(7.1)		(7.4)		(10.4)
Non-controlling interest	(0.6)		(0.8)		(0.6)
AFUDC equity	(0.5)		(0.1)		(0.2)
Amortization of federal investment tax credits	(0.7)		(0.7)		(0.8)
Changes in uncertain tax positions, net	—		(0.4)		0.1
Federal or state tax rate change	27.8		—		(15.3)
Valuation allowance	—		(0.4)		0.5
Stock compensation	(0.1)		(0.1)		(0.8)
Officer compensation limitation	—		—		1.8
Other	(0.9)		(0.3)		0.2
Effective income tax rate	39.8	%	12.7	%	(1.2)	%


Evergy Metro(a)	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(0.3)		(0.2)		(0.2)
State income taxes	4.9		4.7		5.5
Flow through depreciation for plant-related differences	(10.0)		(9.4)		(2.5)
Federal tax credits	(1.9)		(2.5)		(2.1)
AFUDC equity	(0.5)		(0.2)		(0.1)
Amortization of federal investment tax credits	(0.4)		(0.4)		(0.4)

Federal or state tax rate change	(10.5)		—		14.1

Stock compensation	(0.4)		—		—
Officer compensation limitation	0.4		0.3		0.6
Other	—		(1.0)		(1.0)
Effective income tax rate	2.3	%	12.3	%	34.9	%

(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Deferred Income Taxes

The tax effects of major temporary differences resulting in deferred income tax assets (liabilities) in the consolidated balance sheets is in the following table.


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Deferred tax assets:	(millions)
Tax credit carryforward	$	379.6	$	176.5	$	195.9	$	548.9	$	337.3	$	204.4
Income taxes refundable to customers, net	418.2		237.5		132.8		466.3		234.3		176.2
Deferred employee benefit costs	227.6		105.4		117.9		197.0		93.4		120.4
Net operating loss carryforward	51.0		—		0.2		163.4		23.1		61.9
Deferred state income taxes	145.9		101.7		37.8		64.4		64.4		—
Alternative minimum tax carryforward	—		—		—		37.9		13.4		—
Accrued liabilities	152.7		61.8		61.0		80.4		14.5		29.1
Other	181.0		91.4		44.8		183.2		99.1		55.1
Total deferred tax assets before valuation allowance	1,556.0		774.3		590.4		1,741.5		879.5		647.1
Valuation allowances	(14.4)		—		—		(17.5)		—		—
Total deferred tax assets, net	1,541.6		774.3		590.4		1,724.0		879.5		647.1
Deferred tax liabilities:
Plant-related	(2,693.7)		(1,341.2)		(972.1)		(3,004.8)		(1,428.3)		(1,143.2)
Deferred employee benefit costs	(171.4)		(75.6)		(76.3)		(173.3)		(93.4)		(79.5)
ARO regulatory assets	(136.7)		(49.9)		(54.3)		(102.3)		(53.4)		(13.8)
Acquisition premium	(46.9)		(46.9)		—		(68.2)		(68.2)		—
Other	(157.7)		(85.2)		(46.5)		(119.8)		(53.9)		(53.4)
Total deferred tax liabilities	(3,206.4)		(1,598.8)		(1,149.2)		(3,468.4)		(1,697.2)		(1,289.9)
Net deferred income tax liabilities	$	(1,664.8)	$	(824.5)	$	(558.8)	$	(1,744.4)	$	(817.7)	$	(642.8)

Tax Credit Carryforwards

At December 31, 2020 and 2019, Evergy had $379.6 million and $379.0 million, respectively, of federal general business income tax credit carryforwards. At December 31, 2020 and 2019, Evergy Kansas Central had $176.5 million and $168.8 million, respectively, of federal general business income tax credit carryforwards. At December 31, 2020 and 2019, Evergy Metro had $195.9 million and $203.2 million, respectively, of federal general business income tax credit carryforwards. The carryforwards for Evergy, Evergy Kansas Central and Evergy Metro relate primarily to wind production tax credits and advanced coal investment tax credits and expire in the years 2020 to 2040. Approximately $0.2 million of Evergy's credits are related to Low Income Housing credits that were acquired in Great Plains Energy's acquisition of Evergy Missouri West. Due to federal limitations on the utilization of income tax attributes acquired in the Evergy Missouri West acquisition, Evergy expects a portion of these credits to expire unutilized and has provided a valuation allowance against $0.2 million of the federal income tax benefit.

The year of origin of Evergy's, Evergy Kansas Central's and Evergy Metro's related tax benefit amounts for federal tax credit carryforwards as of December 31, 2020 are detailed in the following table.


	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)


2003	0.1		—		—
2004	0.1		—		—
2005	0.1		—		—
2006	0.1		—		—
2007	0.1		—		—
2008	27.4		0.5		26.6
2009	47.7		0.2		47.3
2010	18.3		—		18.2
2011	13.3		—		13.2
2012	12.8		2.0		10.7
2013	24.3		11.3		12.9
2014	24.1		10.7		13.0
2015	24.7		10.9		13.2
2016	27.1		11.0		12.4
2017	43.9		35.1		8.2
2018	43.9		36.3		7.5
2019	37.7		30.9		6.7
2020	33.9		27.6		6.0
	$	379.6	$	176.5	$	195.9

At December 31, 2019, Evergy, Evergy Kansas Central and Evergy Metro had $169.9 million, $168.5 million and $1.2 million, respectively, of tax benefits related to state income tax credit carryforwards. The state income tax credits relate primarily to the Kansas high performance incentive program tax credits. As a result of the exemption from Kansas state income tax beginning in 2021, Evergy, Evergy Kansas Central and Evergy Metro wrote down their Kansas state income tax credit carryforwards in 2020, which were primarily offset by a corresponding decrease in unamortized investment tax credit liability.

Net Operating Loss Carryforwards

At December 31, 2020 and 2019, Evergy had $42.2 million and $132.4 million, respectively, of tax benefits related to federal net operating loss (NOL) carryforwards. At December 31, 2019, Evergy Kansas Central and Evergy Metro had $12.3 million and $56.2 million, respectively, of tax benefits related to federal NOL carryforwards. Approximately $7.1 million of Evergy's tax benefits at December 31, 2020 are related to NOLs that were acquired in the Evergy Missouri West acquisition. Due to federal limitations on the utilization of income tax attributes acquired in the Evergy Missouri West acquisition, Evergy expects a portion of these federal NOL carryforwards to expire unutilized and has provided a valuation allowance against $7.1 million of the federal income tax benefit. The federal NOL carryforwards expire in years 2023 to 2024.

The year of origin of Evergy's related tax benefit amounts for federal NOL carryforwards as of December 31, 2020 are detailed in the following table.


Year of Origin	Amount of Benefit
	(millions)




2005	$	10.2
2006	32.0
	$	42.2

In addition, Evergy also had deferred tax benefits of $8.8 million and $31.0 million related to state NOLs as of December 31, 2020 and 2019, respectively. Evergy Kansas Central had deferred tax benefits of $10.8 million related to state NOLs as of December 31, 2019. Evergy Metro had deferred tax benefits of $0.2 million and $5.7 million related to state NOLs as of December 31, 2020 and 2019, respectively. The state NOL carryforwards expire in years 2021 to 2038. Evergy does not expect to utilize $7.1 million of NOLs before the expiration date of the carryforwards of NOLs in certain states. Therefore, a valuation allowance has been provided against $7.1 million of state tax benefits.

Alternative Minimum Tax Carryforwards

At December 31, 2019, Evergy and Evergy Kansas Central had $37.9 million and $13.4 million, respectively, of federal AMT carryforwards.

Valuation Allowances

Evergy is required to assess the ultimate realization of deferred tax assets using a "more likely than not" assessment threshold. This assessment takes into consideration tax planning strategies within Evergy's control. As a result of this assessment, Evergy has established a partial valuation allowance for federal and state tax NOL carryforwards and tax credit carryforwards. During 2020, $3.1 million of tax benefit was recorded in continuing operations primarily related to utilization or expiration of certain state NOL carryforwards.

Kansas Tax Reform

In May 2020, the state of Kansas exempted certain public utilities, including Evergy Kansas Central and Evergy Metro, from Kansas corporate income tax beginning in 2021 and authorized the KCC to approve changes in rates related to increases or decreases in federal or state income tax rates.

As a result of the exemption from Kansas corporate income tax, the Evergy Companies revalued their deferred income tax assets and liabilities in May 2020. Evergy decreased its net deferred income tax liabilities by $233.8 million, primarily consisting of a $400.4 million adjustment for the revaluation of deferred income tax assets and liabilities included in rate base and a $31.7 million tax gross-up adjustment on this amount for ratemaking purposes and $13.8 million of income tax expense primarily related to the revaluation of deferred income taxes that will not be recovered from customers in future rates; partially offset by a decrease to unamortized investment tax credits of $183.6 million due to the revaluation of certain Kansas income tax credits and a $16.9 million tax gross-up adjustment on this amount for ratemaking purposes.

Evergy Kansas Central decreased its net deferred income tax liabilities by $17.6 million, primarily consisting of a $293.7 million adjustment for the revaluation of deferred income tax assets and liabilities included in rate base and a $17.3 million tax gross-up adjustment on this amount for ratemaking purposes; partially offset by a decrease to unamortized investment tax credits of $183.6 million due to the revaluation of certain Kansas income tax credits and a $16.9 million tax gross-up adjustment on this amount for ratemaking purposes and $109.0 million of income tax expense primarily related to the revaluation of deferred income taxes that will not be recovered from customers in future rates.

Evergy Metro decreased its net deferred income tax liabilities by $152.9 million, primarily consisting of a $106.7 million adjustment for the revaluation of deferred income tax assets and liabilities included in rate base and a $14.4

million tax gross-up adjustment on this amount for ratemaking purposes and $32.2 million of income tax benefit primarily related to the revaluation of deferred income taxes that will not be refunded to customers in future rates.

The changes to the Evergy Companies' net deferred income tax liabilities included in rate base were offset by corresponding changes in regulatory liabilities. The net regulatory liabilities will be refunded to customers in future rates by amortizing the amounts related to plant assets over the remaining useful life of the assets, and amortizing the amounts related to other items over a period to be determined in a future rate case. The changes to the Evergy Companies' unamortized investment tax credits were related to the portion of certain Kansas income tax credits that are not expected to be used after December 31, 2020. The amounts of income tax expense (benefit) recognized by the Evergy Companies related to the revaluation of deferred income taxes that will not be recovered from or refunded to customers in future rates primarily pertain to deferred tax adjustments related to the difference between Evergy's consolidated tax rate and the statutory tax rates used for setting rates at Evergy Kansas Central, Evergy Metro and Evergy Missouri West as well as deferred income tax adjustments related to non-regulated operations.

Evergy Kansas Central and Evergy Metro currently recover the cost of Kansas corporate income taxes in rates from their customers at the statutory rate of 7% that will be effective until 2021, when the income tax exemption established by the state of Kansas takes effect. In accordance with the provisions of the income tax exemption, Evergy Metro and Evergy Kansas Central filed a joint application with the KCC in July 2020 to reduce their retail rates to reflect their exemption from Kansas corporate income taxes. In the joint application, Evergy Metro requested to implement its rate reduction in one phase, effective January 1, 2021, and Evergy Kansas Central requested to implement its rate reduction in three phases, effective January 1 in each of 2021, 2022 and 2023. In November 2020, the KCC approved Evergy Kansas Central's and Evergy Metro's joint application.

Missouri Tax Reform

On June 1, 2018, the Missouri governor signed Senate Bill (S.B.) 884 into law. Most notably, S.B. 884 reduces the corporate income tax rate from 6.25% to 4.0% beginning in 2020, provides for the mandatory use of the single sales factor formula and eliminates intercompany transactions between corporations that file a consolidated Missouri income tax return.

As a result of the change in the Missouri corporate income tax rate, Evergy Metro revalued and restated its deferred income tax assets and liabilities as of June 1, 2018. Evergy Metro decreased its net deferred income tax liabilities by $46.6 million, primarily consisting of a $28.8 million adjustment for the revaluation and restatement of deferred income tax assets and liabilities included in Missouri jurisdictional rate base and a $9.9 million tax gross-up adjustment for ratemaking purposes. The decrease to Evergy Metro's net deferred income tax liabilities included in Missouri jurisdictional rate base were offset by a corresponding increase in regulatory liabilities. The net regulatory liabilities will be amortized to customers over a period to be determined in a future rate case.

Evergy Metro recognized $15.5 million of income tax benefit in 2018 primarily related to the difference between Evergy Metro's revaluation of its deferred income tax assets and liabilities for financial reporting purposes and the amount of the revaluation pertaining to Evergy Metro's Missouri jurisdictional rate base.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References + Details

LEASES

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

LEASES

The Evergy Companies lease office buildings, computer equipment, vehicles, rail cars, generating plant and other property and equipment, including rail cars to serve jointly-owned generating units where Evergy Kansas Central or Evergy Metro is the managing partner and is reimbursed by other joint-owners for the other owners' proportionate share of the costs. Under GAAP, a contract is or contains a lease if the contract conveys the right to control the use of identified property, plant or equipment for a period of time in exchange for consideration. The Evergy Companies assess a contract as being or containing a lease if the contract identifies property, plant and equipment, provides the lessee the right to obtain substantially all of the economic benefits from use of the property, plant and equipment and provides the lessee the right to direct the use of the property, plant and equipment.

The Evergy Companies have entered into several agreements to purchase energy through renewable purchase power agreements that are accounted for as leases that commenced prior to the application of Topic 842. Due to the

intermittent nature of renewable generation, these leases have significant variable lease payments not included in the initial and subsequent measurement of the lease liability. Variable lease payments are expensed as incurred. In addition, certain other contracts contain payment for activity that transfers a separate good or service such as utilities or common area maintenance. The Evergy Companies have elected a practical expedient permitted by GAAP to not separate such components of the lease from other lease components for all leases.

The Evergy, Evergy Kansas Central and Evergy Metro leases have remaining terms ranging from 1 to 18 years, 1 to 18 years and 1 to 25 years, respectively. Leases that have original lease terms of twelve months or less are not recognized on the Evergy Companies’ balance sheets. Some leases have options to renew the lease or terminate early at the election of the Evergy Companies. Judgment is applied at lease commencement to determine the reasonably certain lease term based on then-current assumptions about use of the leased asset, market conditions and terms in the contract. The judgment applied to determine the lease term can significantly impact the measurement of the lease liability and right-of-use asset and lease classification.

The Evergy Companies typically discount lease payments over the term of the lease using their incremental borrowing rates at lease commencement to measure its initial and subsequent lease liability. For leases that existed at the initial application of Topic 842, the Evergy Companies used the incremental borrowing rates that corresponded to the remaining lease term as of January 1, 2019.

Leases may be classified as either operating leases or finance leases. The lease classification is based on assumptions of the lease term and discount rate, as discussed above, and the fair market value and economic life of the leased asset. Operating leases recognize a consistent expense each period over the lease term, while finance leases will result in the separate presentation of interest expense on the lease liability and amortization of the right-of-use asset. Finance leases are treated as operating leases for rate-making purposes and as such, the Evergy Companies defer to a regulatory asset or liability any material differences between expense recognition and the timing of payments in order to match what is being recovered in customer rates.

The Evergy Companies’ lease expense is detailed in the following table.


Evergy	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.7	$	5.2
Interest on lease liabilities	3.1		2.9
Operating lease costs	22.9		23.8
Short-term lease costs	2.1		4.0
Variable lease costs for renewable purchase power agreements	296.6		313.0
Total lease costs	$	332.4	$	348.9


Evergy Kansas Central	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.2	$	5.0
Interest on lease liabilities	2.8		2.7
Operating lease costs	11.9		13.2
Short-term lease costs	0.5		1.2
Variable lease costs for renewable purchase power agreements	135.6		130.8
Total lease costs	$	158.0	$	152.9


Evergy Metro	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	0.3	$	0.1
Interest on lease liabilities	0.1		0.1
Operating lease costs	9.3		9.2
Short-term lease costs	1.5		2.6
Variable lease costs for renewable purchase power agreements	112.2		129.2
Total lease costs	$	123.4	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.


Evergy	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	22.2	$	21.7
Operating cash flows from finance leases	2.8		2.8
Financing cash flows from finance leases	5.6		5.0
Right-of-use assets obtained in exchange for new operating lease liabilities	6.9		10.4
Right-of-use assets obtained in exchange for new finance lease liabilities	5.6		8.3


Evergy Kansas Central	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	12.9	$	13.7
Operating cash flows from finance leases	2.5		2.6
Financing cash flows from finance leases	5.1		4.8
Right-of-use assets obtained in exchange for new operating lease liabilities	6.6		6.1
Right-of-use assets obtained in exchange for new finance lease liabilities	4.0		8.3


Evergy Metro	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	10.8	$	9.9
Operating cash flows from finance leases	0.1		0.1
Financing cash flows from finance leases	0.4		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	0.3		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	1.6		—

Finance Leases

Right-of-use assets for finance leases are included in property, plant and equipment on the Evergy Companies’ balance sheets. Lease liabilities for finance leases are included in other current and other long-term liabilities. Payments and other supplemental information for finance leases as of December 31, 2020, are detailed in the following table.


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	8.8		$	8.0		$	0.6
2022	7.3			6.5			0.6
2023	6.6			5.8			0.6
2024	5.3			4.6			0.6
2025	4.6			4.1			0.2
After 2025	42.4			41.2			0.6
Total finance lease payments	75.0			70.2			3.2
Amounts representing imputed interest	(23.7)			(22.7)			(0.6)
Present value of lease payments	51.3			47.5			2.6
Less: current portion	(6.0)			(5.6)			(0.4)
Total long-term obligations under finance leases	$	45.3		$	41.9		$	2.2

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	314.1		$	53.9		$	2.6

Weighted-average remaining lease term (years)	13.5			14.1			5.9
Weighted-average discount rate	5.6		%	5.5		%	4.9		%

Operating Leases

Right-of-use assets for operating leases are included in other long-term assets on the Evergy Companies’ balance sheets. Lease liabilities for operating leases are included in other current and other long-term liabilities. Lease payments and other supplemental information for operating leases as of December 31, 2020, are detailed in the following table.


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	18.5		$	10.1		$	10.1
2022	15.3			7.7			9.3
2023	12.2			5.0			8.8
2024	10.4			3.5			8.5
2025	7.9			1.5			8.3
After 2025	37.3			0.4			74.5
Total operating lease payments	101.6			28.2			119.5
Amounts representing imputed interest	(14.4)			(0.8)			(31.4)
Present value of lease payments	87.2			27.4			88.1
Less: current portion	(14.5)			(8.2)			(6.7)
Total long-term obligations under operating leases	$	72.7		$	19.2		$	81.4

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	93.2		$	34.4		$	71.3

Weighted-average remaining lease term (years)	8.3			3.4			15.3
Weighted-average discount rate	3.7		%	2.9		%	4.1		%

LEASES

The Evergy Companies’ lease expense is detailed in the following table.


Evergy	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.7	$	5.2
Interest on lease liabilities	3.1		2.9
Operating lease costs	22.9		23.8
Short-term lease costs	2.1		4.0
Variable lease costs for renewable purchase power agreements	296.6		313.0
Total lease costs	$	332.4	$	348.9


Evergy Kansas Central	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.2	$	5.0
Interest on lease liabilities	2.8		2.7
Operating lease costs	11.9		13.2
Short-term lease costs	0.5		1.2
Variable lease costs for renewable purchase power agreements	135.6		130.8
Total lease costs	$	158.0	$	152.9


Evergy Metro	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	0.3	$	0.1
Interest on lease liabilities	0.1		0.1
Operating lease costs	9.3		9.2
Short-term lease costs	1.5		2.6
Variable lease costs for renewable purchase power agreements	112.2		129.2
Total lease costs	$	123.4	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.


Evergy	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	22.2	$	21.7
Operating cash flows from finance leases	2.8		2.8
Financing cash flows from finance leases	5.6		5.0
Right-of-use assets obtained in exchange for new operating lease liabilities	6.9		10.4
Right-of-use assets obtained in exchange for new finance lease liabilities	5.6		8.3


Evergy Kansas Central	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	12.9	$	13.7
Operating cash flows from finance leases	2.5		2.6
Financing cash flows from finance leases	5.1		4.8
Right-of-use assets obtained in exchange for new operating lease liabilities	6.6		6.1
Right-of-use assets obtained in exchange for new finance lease liabilities	4.0		8.3


Evergy Metro	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	10.8	$	9.9
Operating cash flows from finance leases	0.1		0.1
Financing cash flows from finance leases	0.4		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	0.3		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	1.6		—

Finance Leases


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	8.8		$	8.0		$	0.6
2022	7.3			6.5			0.6
2023	6.6			5.8			0.6
2024	5.3			4.6			0.6
2025	4.6			4.1			0.2
After 2025	42.4			41.2			0.6
Total finance lease payments	75.0			70.2			3.2
Amounts representing imputed interest	(23.7)			(22.7)			(0.6)
Present value of lease payments	51.3			47.5			2.6
Less: current portion	(6.0)			(5.6)			(0.4)
Total long-term obligations under finance leases	$	45.3		$	41.9		$	2.2

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	314.1		$	53.9		$	2.6

Weighted-average remaining lease term (years)	13.5			14.1			5.9
Weighted-average discount rate	5.6		%	5.5		%	4.9		%

Operating Leases


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	18.5		$	10.1		$	10.1
2022	15.3			7.7			9.3
2023	12.2			5.0			8.8
2024	10.4			3.5			8.5
2025	7.9			1.5			8.3
After 2025	37.3			0.4			74.5
Total operating lease payments	101.6			28.2			119.5
Amounts representing imputed interest	(14.4)			(0.8)			(31.4)
Present value of lease payments	87.2			27.4			88.1
Less: current portion	(14.5)			(8.2)			(6.7)
Total long-term obligations under operating leases	$	72.7		$	19.2		$	81.4

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	93.2		$	34.4		$	71.3

Weighted-average remaining lease term (years)	8.3			3.4			15.3
Weighted-average discount rate	3.7		%	2.9		%	4.1		%

QUARTERLY OPERATING RESULTS (UNAUDITED)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY OPERATING RESULTS (UNAUDITED)


	Quarter
Evergy	1st		2nd		3rd		4th
2020	(millions, except per share amounts)
Operating revenue	$	1,116.7	$	1,184.7	$	1,517.6	$	1,094.4
Operating income	197.5		271.7		521.7		153.0
Net income	72.2		136.3		367.5		54.0
Net income attributable to Evergy, Inc.	69.4		133.4		364.5		51.0
Basic and diluted earnings per common share	0.31		0.59		1.60		0.22

2019
Operating revenue	$	1,216.9	$	1,221.7	$	1,577.6	$	1,131.6
Operating income	209.6		271.7		538.7		165.8
Net income	103.4		144.6		370.9		66.7
Net income attributable to Evergy, Inc.	99.5		139.7		366.8		63.9
Basic and diluted earnings per common share	0.39		0.57		1.56		0.28


	Quarter
Evergy Kansas Central	1st		2nd		3rd		4th
2020	(millions)
Operating revenue	$	560.1	$	570.8	$	733.6	$	553.6
Operating income	114.5		121.2		240.7		90.9
Net income (loss)	55.2		(37.6)		173.1		45.1
Net income (loss) attributable to Evergy Kansas Central, Inc.	52.4		(40.5)		170.1		42.1
2019
Operating revenue	$	596.8	$	585.5	$	749.0	$	576.1
Operating income	124.3		127.6		242.4		102.2
Net income	68.3		67.2		168.2		55.4
Net income attributable to Evergy Kansas Central, Inc.	64.4		62.3		164.1		52.6


	Quarter
Evergy Metro	1st		2nd		3rd		4th
2020	(millions)
Operating revenue	$	375.5	$	424.3	$	528.5	$	377.3
Operating income	63.7		112.5		204.4		53.7
Net income	25.6		102.9		147.7		22.5
2019
Operating revenue	$	425.4	$	437.0	$	568.8	$	375.3
Operating income	56.9		101.9		215.5		52.2
Net income	16.0		59.4		151.9		27.9

Quarterly data is subject to seasonal fluctuations with peak periods occurring in the summer months.

Schedule I Financial Statements of Parent Company

12 Months Ended

Dec. 31, 2020

Condensed Financial Information Disclosure [Abstract]

Condensed Financial Information of Parent Company Only Disclosure


EVERGY, INC.
Statements of Comprehensive Income of Parent Company

	2020		2019		Period from June 4, 2018 through December 31, 2018
OPERATING EXPENSES:	(millions)
Operating and maintenance	$	39.3	$	19.4	$	54.6

Total Operating Expenses	39.3		19.4		54.6
INCOME FROM OPERATIONS	(39.3)		(19.4)		(54.6)
OTHER INCOME (EXPENSE)
Equity in earnings from subsidiaries	683.4		698.2		364.7
Investment earnings	32.1		32.7		26.3

Other expense	(0.1)		(0.1)		(2.6)
Total Other Income, Net	715.4		730.8		388.4
Interest expense	86.3		60.7		19.6
INCOME BEFORE INCOME TAXES	589.8		650.7		314.2
Income tax benefit	(22.7)		(13.7)		(10.7)

NET INCOME	$	612.5	$	664.4	$	324.9
COMPREHENSIVE INCOME
NET INCOME	$	612.5	$	664.4	$	324.9
OTHER COMPREHENSIVE INCOME
Derivative hedging activity
Loss on derivative hedging instruments	—		(64.4)		(5.4)
Income tax benefit	—		16.5		1.4
Net loss on derivative hedging instruments	—		(47.9)		(4.0)
Reclassification to expenses, net of taxes	3.0		1.5		—
Derivative hedging activity, net of tax	3.0		(46.4)		(4.0)
Other comprehensive income (loss) from subsidiaries, net	(2.4)		(0.6)		1.0
Total other comprehensive income (loss)	0.6		(47.0)		(3.0)
COMPREHENSIVE INCOME	$	613.1	$	617.4	$	321.9

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.


EVERGY, INC.
Balance Sheets of Parent Company
	December 31
	2020		2019
ASSETS	(millions, except share amounts)
CURRENT ASSETS:
Cash and cash equivalents	$	11.0		$	11.6
Accounts receivable from subsidiaries	54.1			24.5
Notes receivable from subsidiaries	349.4			2.0
Income taxes receivable	7.4			8.0
Prepaid expenses and other assets	1.9			2.4
Total Current Assets	423.8			48.5
OTHER ASSETS:
Investment in subsidiaries	10,349.2			10,023.1
Note receivable from subsidiaries	287.5			634.9
Deferred income taxes	20.5			34.2
Other	0.5			0.9
Total Other Assets	10,657.7			10,693.1
TOTAL ASSETS	$	11,081.5		$	10,741.6
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Current maturities of long-term debt	$	350.0		$	—
Notes payable	200.0			20.0
Accounts payable to subsidiaries	18.4			13.1
Accrued interest	13.9			14.6
Other	11.0			8.1
Total Current Liabilities	593.3			55.8
LONG-TERM LIABILITIES:
Long-term debt, net	1,875.7			2,223.7
Other	11.7			16.9
Total Long-Term Liabilities	1,887.4			2,240.6
Commitments and Contingencies (Note 15)
EQUITY:
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,836,670 and 226,641,443 shares issued	7,063.2			7,053.7
Retained earnings	1,587.0			1,441.5
Accumulated other comprehensive loss	(49.4)			(50.0)
Total shareholders' equity	8,600.8			8,445.2
TOTAL LIABILITIES AND EQUITY	$	11,081.5		10,741.6

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.


EVERGY, INC.
Statements of Cash Flows of Parent Company

	2020		2019		Period from June 4, 2018 through December 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:	(millions)
Net income	$	612.5	$	664.4	$	324.9
Adjustments to reconcile income to net cash from operating activities:






Non-cash compensation	16.0		16.3		10.0
Net deferred income taxes and credits	9.6		21.4		(6.3)


Equity in earnings from subsidiaries	(683.4)		(698.2)		(364.7)
Other	7.0		2.1		—
Changes in working capital items:
Accounts receivable from subsidiaries	(30.0)		8.9		(8.5)

Income taxes receivable	0.6		(7.8)		(0.2)
Prepaid expenses and other current assets	0.8		(0.1)		(1.0)
Accounts payable to subsidiaries	5.0		(15.0)		4.7
Accrued taxes	—		—		(35.2)
Accrued interest	(0.7)		12.5		(13.6)
Other current liabilities	2.9		1.7		2.4
Cash dividends from subsidiaries	355.0		460.0		236.0
Changes in other assets	0.3		0.2		0.1
Changes in other liabilities	(3.7)		(3.5)		20.0
Cash Flows from Operating Activities	291.9		462.9		168.6
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:

Cash acquired from the merger with Great Plains Energy	—		—		1,142.2




Proceeds from interest rate swap	—		—		140.6

Cash Flows from Investing Activities	—		—		1,282.8
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short term debt, net	180.0		20.0		(56.1)

Proceeds from long-term debt	—		1,585.0		—
Payment for settlement of interest rate swap accounted for as a cash flow hedge	—		(69.8)		—





Cash dividends paid	(465.0)		(462.5)		(245.9)
Repurchase of common stock	—		(1,628.7)		(1,042.3)
Other financing activities	(7.5)		(2.4)		—
Cash Flows used in Financing Activities	(292.5)		(558.4)		(1,344.3)
NET CHANGE IN CASH AND CASH EQUIVALENTS	(0.6)		(95.5)		107.1
CASH AND CASH EQUIVALENTS:
Beginning of period	11.6		107.1		—
End of period	$	11.0	$	11.6	$	107.1

The accompanying Notes to Financial Statements of Parent Company are an integral part of these statements.

1. ORGANIZATION AND BASIS OF PRESENTATION

The Evergy, Inc. Parent Company Financial Statements have been prepared to comply with Rule 12-04 of Regulation S-X.

Evergy, Inc. was incorporated in 2017 as Monarch Energy, a wholly-owned subsidiary of Great Plains Energy. Prior to the closing of the merger transactions, Monarch Energy changed its name to Evergy, Inc. and did not conduct any business activities other than those required for its formation and matters contemplated by the Amended Merger Agreement. On June 4, 2018, in accordance with the Amended Merger Agreement, Great Plains Energy merged into Evergy, Inc., with Evergy, Inc. surviving the merger and King Energy merged into Evergy Kansas Central, with Evergy Kansas Central surviving the merger. These merger transactions resulted in Evergy, Inc. becoming the parent entity of Evergy Kansas Central and the direct subsidiaries of Great Plains Energy, including Evergy Metro and Evergy Missouri West.

See Note 2 to the consolidated financial statements for additional information regarding the merger.

Evergy, Inc. operates primarily through its wholly-owned direct subsidiaries. Evergy, Inc.'s investments in subsidiaries are accounted for using the equity method. Fair value adjustments and goodwill related to the acquired assets and liabilities of Great Plains Energy and its direct subsidiaries are only reflected on Evergy's consolidated financial statements and as such, are not included in Evergy, Inc.'s Parent Company Financial Statements. See Note 1 to the consolidated financial statement for additional information.

2. LONG-TERM DEBT

See Note 13 to the consolidated financial statements for additional information on Evergy, Inc.'s long-term debt.

3. GUARANTEES

See Note 16 to the consolidated financial statements for additional information regarding Evergy, Inc.'s guarantees.

4. DIVIDENDS

Cash dividends paid to Evergy, Inc. by its subsidiaries were $355.0 million for the year ended December 31, 2020, $460.0 million for the year ended December 31, 2019 and $236.0 million for the period from June 4, 2018 through December 31, 2018. See Note 18 to the consolidated financial statements for information regarding the dividend restrictions of Evergy, Inc. and its subsidiaries.

Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II Valuation and Qualifying Accounts


Evergy, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2020, 2019 and 2018

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2020	(millions)
Allowance for uncollectible accounts		$	10.5		$	24.9		$	12.5	(a)		$	28.6	(b)		$	19.3
Tax valuation allowance		17.5			—			—				3.1		(c)		14.4
Year Ended December 31, 2019
Allowance for uncollectible accounts		$	9.2		$	27.2		$	12.4	(a)		$	38.3	(b)		$	10.5
Tax valuation allowance		27.3			0.6			—				10.4		(c)		17.5
Year Ended December 31, 2018
Allowance for uncollectible accounts		$	6.7		$	20.7		$	16.9	(e)		$	35.1	(b)		$	9.2
Tax valuation allowance		—			2.2			26.8		(d)		1.7		(c)		27.3

(a) Recoveries.

(b) Uncollectible accounts charged off.

(d) Primarily represents the addition of Great Plains Energy's allowance as of the date of the merger.

(e) Recoveries and the addition of Great Plains Energy's allowance as of the date of the merger.


Evergy Kansas Central, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2020, 2019 and 2018

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2020	(millions)
Allowance for uncollectible accounts		$	3.8		$	11.1		$	2.6	(a)		$	10.0	(b)		$	7.5

Year Ended December 31, 2019
Allowance for uncollectible accounts		$	3.9		$	7.2		$	3.4	(a)		$	10.7	(b)		$	3.8
Tax valuation allowance		1.7			—			—				1.7		(c)		—
Year Ended December 31, 2018
Allowance for uncollectible accounts		$	6.7		$	9.0		$	7.4	(a)		$	19.2	(b)		$	3.9
Tax valuation allowance		—			1.7			—				—				1.7

(a) Recoveries.

(b) Uncollectible accounts charged off.


Evergy Metro, Inc.
Valuation and Qualifying Accounts
Years Ended December 31, 2020, 2019 and 2018

				Additions
				Charged
	Balance At			To Costs			Charged								Balance
	Beginning			And			To Other								At End
Description	Of Period			Expenses			Accounts				Deductions				Of Period
Year Ended December 31, 2020	(millions)
Allowance for uncollectible accounts		$	4.6		$	9.0		$	6.9	(a)		$	12.4	(b)		$	8.1
Year Ended December 31, 2019
Allowance for uncollectible accounts		$	3.8		$	13.7		$	6.3	(a)		$	19.2	(b)		$	4.6

Year Ended December 31, 2018
Allowance for uncollectible accounts		$	2.2		$	13.1		$	4.4	(a)		$	15.9	(b)		$	3.8

(a) Recoveries.

(b) Uncollectible accounts charged off.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Dec. 31, 2020
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation Evergy Kansas Central was determined to be the accounting acquirer in the merger and thus, the predecessor of Evergy. Evergy had separate operations for the period beginning with the quarter ended June 30, 2018, and references to amounts for periods after the closing of the merger relate to Evergy. The results of Great Plains Energy's direct subsidiaries have been included in Evergy's results of operations from the date of the closing of the merger and thereafter. Evergy Metro elected not to apply "push-down accounting" related to the merger, whereby the adjustments of assets and liabilities to fair value and the resulting goodwill would be recorded on the financial statements of the acquired subsidiary. These adjustments for Evergy Metro, as well as those related to the acquired assets and liabilities of Great Plains Energy and its other direct subsidiaries, are only reflected on Evergy's consolidated financial statements. Each of Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated financial statements includes the accounts of their subsidiaries and variable interest entities (VIEs) of which they are the primary beneficiary. Undivided interests in jointly-owned generation facilities are included on a proportionate basis. Intercompany transactions have been eliminated. The Evergy Companies assess financial performance and allocate resources on a consolidated basis (i.e., operate in one segment).
Use of Estimates	Use of Estimates The process of preparing financial statements in conformity with generally accepted accounting principles (GAAP) requires the use of estimates and assumptions that affect the reported amounts of certain types of assets, liabilities, revenues and expenses. Such estimates primarily relate to unsettled transactions and events as of the date of the financial statements. Accordingly, upon settlement, actual results may differ from estimated amounts.
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents consist of highly liquid investments with original maturities of three months or less at acquisition.
Fuel Inventory and Supplies	Fuel Inventory and SuppliesThe Evergy Companies record fuel inventory and supplies at average cost.
Property, Plant and Equipment	Property, Plant and Equipment The Evergy Companies record the value of property, plant and equipment, including that of VIEs, at cost. For plant, cost includes contracted services, direct labor and materials, indirect charges for engineering and supervision and an allowance for funds used during construction (AFUDC). AFUDC represents the allowed cost of capital used to finance utility construction activity. AFUDC equity funds are included as a non-cash item in other income and AFUDC borrowed funds are a reduction of interest expense. AFUDC is computed by applying a composite rate to qualified construction work in progress. The rates used to compute gross AFUDC are compounded semi-annually. When property units are retired or otherwise disposed, the original cost, net of salvage, is charged to accumulated depreciation. Repair of property and replacement of items not considered to be units of property are expensed as incurred, except for planned refueling and maintenance outages at Wolf Creek Generating Station (Wolf Creek). As authorized by regulators, the incremental maintenance cost incurred for such outages is deferred and amortized to expense ratably over the period between planned outages.
Depreciation and Amortization	Depreciation and AmortizationDepreciation and amortization of utility plant other than nuclear fuel is computed using the straight-line method over the estimated lives of depreciable property based on rates approved by state regulatory authorities. Annual depreciation rates average approximately 3%. See Note 8 for more details. Nuclear fuel is amortized to fuel expense based on the quantity of heat produced during the generation of electricity.
Plant to be Retired, Net	Plant to be Retired, Net When the Evergy Companies retire utility plant, the original cost, net of salvage, is charged to accumulated depreciation. However, when it becomes probable an asset will be retired significantly in advance of its original expected useful life and in the near term, the cost of the asset and related accumulated depreciation is recognized as a separate asset and a probable abandonment. If the asset is still in service, the net amount is classified as plant to be retired, net on the consolidated balance sheets. If the asset is no longer in service, the net amount is classified as a regulatory asset on the consolidated balance sheets. The Evergy Companies must also assess the probability of full recovery of the remaining net book value of the abandonment. The net book value that may be retained as an asset on the balance sheet for the abandonment is dependent upon amounts that may be recovered through regulated rates, including any return. An impairment charge, if any, would equal the difference between the remaining net book value of the asset and the present value of the future revenues expected from the asset. Evergy Missouri West has determined that its November 2018 retirement of Sibley No. 3 Unit meets the criteria to be considered an abandonment. As of December 31, 2020, Evergy has classified the remaining Sibley No. 3 Unit net book value of $128.4 million as retired generation facilities within regulatory assets on its consolidated balance sheet. This regulatory asset is reduced by approximately $9 million of annual amortization expense, which is an amount equal to the annual depreciation expense for the asset reflected in retail rates. In October 2019, the Missouri Public Service Commission (MPSC) granted the request of certain intervenors for an Accounting Authority Order (AAO) that requires Evergy Missouri West to record a regulatory liability for all revenues collected from customers for return on investment, non-fuel operations and maintenance costs, taxes including accumulated deferred income taxes and all other costs associated with Sibley Station following the station's retirement in November 2018 for consideration in Evergy Missouri West's next rate case, which is expected to be completed no later than the end of 2022. See Note 5 for additional information regarding the AAO. Evergy Missouri West expects that the MPSC's decision in its next rate case regarding the AAO could impact the valuation of its regulatory asset for retired generation facilities but as of December 31, 2020, has concluded that no impairment is required based on the relevant facts and circumstances.
Nuclear Plant Decommissioning Costs	Nuclear Plant Decommissioning Costs Nuclear plant decommissioning cost estimates are based on either the immediate dismantlement method or the deferred dismantling method as determined by the State Corporation Commission of the State of Kansas (KCC) and MPSC and include the costs of decontamination, dismantlement and site restoration. Based on these cost estimates, Evergy Kansas Central and Evergy Metro each contribute to a tax-qualified trust fund to be used to decommission Wolf Creek. Related liabilities for decommissioning are included on Evergy's, Evergy Kansas Central's and Evergy Metro's consolidated balance sheets in asset retirement obligations (AROs). As a result of the authorized regulatory treatment and related regulatory accounting, differences between the decommissioning trust fund asset and the related ARO are recorded as a regulatory asset or liability.
Regulatory Accounting	Regulatory AccountingAccounting standards are applied that recognize the economic effects of rate regulation. Accordingly, regulatory assets and liabilities have been recorded when required by a regulatory order or based on regulatory precedent.
Cash Surrender Value of Life Insurance	Cash Surrender Value of Life Insurance Amounts related to corporate-owned life insurance (COLI) are recorded on the consolidated balance sheets in other long-terms assets and are detailed in the following table for Evergy. Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity. Increases in cash surrender value and death benefits are recorded in other income in the Evergy Companies' consolidated statements of income and comprehensive income. Interest expense incurred on policy loans is offset against the policy income. Income from death benefits is highly variable from period to period.
Fair Value of Financial Instruments	Fair Value of Financial Instruments The following methods and assumptions were used to estimate the fair value of the following financial instruments for which it was practicable to estimate that value. Nuclear decommissioning trust fund - The Evergy Companies' nuclear decommissioning trust fund assets are recorded at fair value based on quoted market prices of the investments held by the fund and/or valuation models. Pension plans - For financial reporting purposes, the market value of plan assets is the fair value based on quoted market prices of the investments held by the fund and/or valuation models.
Revenue Recognition	Revenue Recognition The Evergy Companies recognize revenue on the sale of electricity to customers over time as the service is provided in the amount they have the right to invoice. Revenues recorded include electric services provided but not yet billed by the Evergy Companies. Unbilled revenues are recorded for kWh usage in the period following the customers' billing cycle to the end of the month. This estimate is based on net system kWh usage less actual billed kWhs. The Evergy Companies' estimated unbilled kWhs are allocated and priced by regulatory jurisdiction across the rate classes based on actual billing rates. The Evergy Companies' unbilled revenue estimate is affected by factors including fluctuations in energy demand, weather, line losses and changes in the composition of customer classes. See Note 4 for the balance of unbilled receivables for each of Evergy, Evergy Kansas Central and Evergy Metro as of December 31, 2020 and 2019. The Evergy Companies also collect sales taxes and franchise fees from customers concurrent with revenue-producing activities that are levied by state and local governments. These items are excluded from revenue, and thus are not reflected on the consolidated statements of income and comprehensive income for Evergy, Evergy Kansas Central and Evergy Metro.
Allowance for Credit Losses	Allowance for Credit Losses Historical loss information generally provides the basis for the Evergy Companies' assessment of expected credit losses. The Evergy Companies use an aging of accounts receivable method to assess historical loss information. When historical experience may not fully reflect the Evergy Companies' expectations about the future, the Evergy Companies will adjust historical loss information, as necessary, to reflect the current conditions and reasonable and supportable forecasts not already reflected in the historical loss information. Receivables are charged off when they are deemed uncollectible, which is based on a number of factors including specific facts surrounding an account and management's judgment.
Property Gains and Losses	Property Gains and LossesNet gains and losses from the sale of assets and businesses and from asset impairments are recorded in operating expenses.
Asset Impairments	Asset Impairments Long-lived assets and finite-lived intangible assets subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If the sum of the undiscounted expected future cash flows from an asset to be held and used is less than the carrying value of the asset, an asset impairment must be recognized in the financial statements. The amount of impairment recognized is the excess of the carrying value of the asset over its fair value. Goodwill and indefinite lived intangible assets are tested for impairment annually and when an event occurs indicating the possibility that an impairment exists. The annual test must be performed at the same time each year. The goodwill impairment test consists of comparing the fair value of a reporting unit to its carrying amount, including goodwill, to identify potential impairment. In the event that the carrying amount exceeds the fair value of the reporting unit, an impairment loss is recognized for the difference between the carrying amount of the reporting unit and its fair value.
Income Taxes	Income Taxes Income taxes are accounted for using the asset/liability approach. Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax bases of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance when, in the opinion of management, it is more likely than not that some portion of the deferred tax assets will not be realized. The Evergy Companies recognize tax benefits based on a "more-likely-than-not" recognition threshold. In addition, the Evergy Companies recognize interest accrued related to unrecognized tax benefits in interest expense and penalties in operating expenses. Evergy files a consolidated federal income tax return as well as unitary and combined income tax returns in several state jurisdictions with Kansas and Missouri being the most significant. Income taxes for consolidated or combined subsidiaries are allocated to the subsidiaries based on separate company computations of income or loss. Evergy Kansas Central's and Evergy Metro's income tax provisions include taxes allocated based on their separate company's income or loss. The Evergy Companies have established a net regulatory liability for future refunds to be made to customers for amounts collected from customers in excess of income taxes in current rates. Tax credits are recognized in the year generated except for certain Evergy Kansas Central, Evergy Metro and Evergy Missouri West investment tax credits that have been deferred and amortized over the remaining service lives of the related properties.
Earnings Per Share	Earnings Per ShareTo compute basic earnings per share (EPS), Evergy divides net income attributable to Evergy, Inc. by the weighted average number of common shares outstanding. Diluted EPS includes the effect of issuable common shares resulting from restricted share units (RSUs), performance shares and restricted stock. Evergy computes the dilutive effects of potential issuances of common shares using the treasury stock method.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards Leases In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases, which requires an entity that is a lessee to record a right-of-use asset and a lease liability for lease payments on the balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the income statement. Lessor accounting remains largely unchanged. In January 2018, the FASB issued ASU No. 2018-01, Leases: Land Easement Practical Expedient for Transition to Topic 842, which permits entities to elect an optional transition practical expedient to not evaluate under Topic 842 land easements that exist or expired before the entity's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. In July 2018, the FASB issued ASU No. 2018-10, Codification Improvements to Topic 842, Leases, which updates narrow aspects of the guidance issued in ASU No. 2016-02. Also in July 2018, the FASB issued ASU No. 2018-11, Leases: Targeted Improvements, which provides an optional transition method that allows entities to initially apply Topic 842 at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption without restating prior periods. In December 2018, the FASB issued ASU No. 2018-20, Leases: Narrow-Scope Improvements for Lessors, which is expected to reduce a lessor's implementation and ongoing costs associated with applying ASU No. 2016-02. In March 2019, the FASB issued ASU No. 2019-01, Leases: Codification Improvements, which clarifies certain lessor accounting and interim reporting requirements. ASU No. 2016-02 and the subsequent amendments are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted, and requires a modified retrospective transition approach with an option to either adjust or not adjust comparative periods. The Evergy Companies adopted the new guidance on January 1, 2019, without adjusting comparative periods for all leases existing as of January 1, 2019, by electing the optional transition method permitted by ASU No. 2018-11. As a result, Evergy, Evergy Kansas Central and Evergy Metro recorded an increase to assets and liabilities of approximately $110 million, $40 million and $80 million, respectively, as of January 1, 2019. Evergy Kansas Central and Evergy Metro have certain lease transactions between them for which the related assets and liabilities are eliminated at consolidated Evergy. The adoption of Topic 842 did not have a material impact on the Evergy Companies consolidated statements of income and comprehensive income and there was no cumulative-effect adjustment recorded to the opening balance of retained earnings. The Evergy Companies also elected a practical expedient to forgo reassessing existing or expired contracts as leases to determine whether each is in scope of Topic 842 and to forgo reassessing lease classification for existing and expired leases.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2020

Accounting Policies [Abstract]

Schedule of Fuel Inventory and Supplies

The following table separately states the balances for fuel inventory and supplies.


	December 31
	2020		2019
Evergy	(millions)
Fuel inventory	$	145.0	$	146.4
Supplies	359.5		335.2
Fuel inventory and supplies	$	504.5	$	481.6
Evergy Kansas Central
Fuel inventory	$	79.3	$	80.2
Supplies	197.1		186.2
Fuel inventory and supplies	$	276.4	$	266.4
Evergy Metro
Fuel inventory	$	44.9	$	46.1
Supplies	125.5		116.9
Fuel inventory and supplies	$	170.4	$	163.0

Schedule of Allowance for Funds used During Construction

The amounts of the Evergy Companies' AFUDC for borrowed and equity funds are detailed in the following table.


	2020		2019		2018
Evergy	(millions)
AFUDC borrowed funds	$	16.5	$	14.5	$	10.4
AFUDC equity funds	17.2		2.2		3.1
Total	$	33.7	$	16.7	$	13.5
Evergy Kansas Central
AFUDC borrowed funds	$	8.5	$	7.5	$	6.6
AFUDC equity funds	9.1		—		2.9
Total	$	17.6	$	7.5	$	9.5
Evergy Metro(a)
AFUDC borrowed funds	$	6.0	$	4.3	$	4.9
AFUDC equity funds	8.0		2.2		1.4
Total	$	14.0	$	6.5	$	6.3

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

The average rates used in the calculation of AFUDC are detailed in the following table.


	2020	2019	2018
Evergy Kansas Central	4.7%	3.0%	3.3%
Evergy Metro	5.2%	4.6%	3.9%
Evergy Missouri West	3.5%	3.7%	2.9%

Schedule pf Depreciable Lives of Property Plant and Equipment

The depreciable lives of Evergy's, Evergy Kansas Central's and Evergy Metro's property, plant and equipment are detailed in the following table.


	Evergy			Evergy Kansas Central				Evergy Metro
	(years)
Generating facilities	8	to	87		8	to	87	20	to	60
Transmission facilities	15	to	94		36	to	94	15	to	70
Distribution facilities	8	to	73		19	to	73	8	to	55
Other	5	to	84		7	to	84	5	to	50

Schedule of Cash Surrender Value of Corporate Owned Life Insurance

Substantially all of Evergy's COLI-related balances relate to Evergy Kansas Central's COLI activity.


	December 31
	2020		2019
Evergy	(millions)
Cash surrender value of policies	$	1,369.6	$	1,370.0
Borrowings against policies	(1,237.6)		(1,237.1)
Corporate-owned life insurance, net	$	132.0	$	132.9

Schedule of Other Income Expense

The table below shows the detail of other expense for each of the Evergy Companies.


	2020		2019		2018
Evergy	(millions)
Non-service cost component of net benefit cost	$	(58.6)	$	(55.6)	$	(47.8)
Other	(19.6)		(21.3)		(30.9)
Other expense	$	(78.2)	$	(76.9)	$	(78.7)
Evergy Kansas Central
Non-service cost component of net benefit cost	$	(21.2)	$	(20.1)	$	(23.5)
Other	(17.7)		(20.0)		(23.3)
Other expense	$	(38.9)	$	(40.1)	$	(46.8)
Evergy Metro(a)
Non-service cost component of net benefit cost	$	(24.2)	$	(20.9)	$	(25.9)
Other	(1.3)		(0.5)		(5.0)
Other expense	$	(25.5)	$	(21.4)	$	(30.9)

(a) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Earnings Per Share, Basic and Diluted

The following table reconciles Evergy's basic and diluted EPS.


	2020		2019		2018
Income	(millions, except per share amounts)
Net income	$	630.0	$	685.6	$	546.0
Less: Net income attributable to noncontrolling interests	11.7		15.7		10.2
Net income attributable to Evergy, Inc.	$	618.3	$	669.9	$	535.8
Common Shares Outstanding
Weighted average number of common shares outstanding - basic	227.2		239.5		213.9
Add: effect of dilutive securities	0.3		0.4		0.2
Diluted average number of common shares outstanding	227.5		239.9		214.1
Basic EPS	$	2.72	$	2.80	$	2.50
Diluted EPS	$	2.72	$	2.79	$	2.50

Supplemental Cash Flow Information


Year Ended December 31	2020		2019		2018
Evergy	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	367.6	$	329.5	$	255.9
Interest of VIEs	0.8		1.6		2.3
Income taxes, net of refunds	(46.5)		(5.2)		(0.9)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	463.3		186.0		(7.8)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	0.9		(0.3)		0.5


Year Ended December 31	2020		2019		2018
Evergy Kansas Central	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	157.5	$	143.0	$	155.3
Interest of VIEs	0.8		1.6		2.3
Income taxes, net of refunds	4.7		29.9		37.5
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	235.4		92.1		(32.5)


Year Ended December 31	2020		2019		2018
Evergy Metro(a)	(millions)
Cash paid for (received from):
Interest, net of amount capitalized	$	109.9	$	118.4	$	129.4
Income taxes, net of refunds	4.8		77.0		31.2
Non-cash investing transactions:
Property, plant and equipment additions	192.5		80.7		19.2

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL (Tables)

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Schedule of Accounting Charges and Deferrals Related to Merger


Description	Income Statement Line Item	Expected Payment Period	Evergy		Evergy Kansas Central		Evergy Metro
			(millions)
One-time bill credits	Operating revenues	2018 - 2019	$	(59.7)	$	(23.1)	$	(22.4)
Annual bill credits	Operating revenues	2019 - 2022	(10.5)		(7.9)		(2.6)
Total impact to operating revenues			$	(70.2)	$	(31.0)	$	(25.0)

Charitable contributions and community support	Operating and maintenance	2018 - 2027	$	24.7	$	—	$	—
Voluntary severance and accelerated equity compensation	Operating and maintenance	2018 - 2019	47.9		44.2		2.6
Other transaction and transition costs	Operating and maintenance	2018	51.0		21.5		2.1
Reallocation and deferral of merger transition costs	Operating and maintenance	n/a	(47.8)		(13.8)		(23.2)
Total impact to operating and maintenance expense			$	75.8	$	51.9	$	(18.5)
Total			$	(146.0)	$	(82.9)	$	(6.5)

Schedule of Business Acquisitions by Acquisition, Equity Interest Issued or Issuable

The total consideration transferred in the merger is based on the closing stock price of Evergy Kansas Central on June 4, 2018, and is calculated as follows.


	(millions, except share amounts)
Great Plains Energy common stock shares outstanding as of June 4, 2018	215,800,074
Great Plains Energy restricted stock awards outstanding as of June 4, 2018	(204,825)
Great Plains Energy shares to be converted to Evergy shares	215,595,249
Exchange ratio	0.5981
Evergy common stock shares issued to Great Plains Energy shareholders	128,947,518
Closing price of Evergy Kansas Central common stock as of June 4, 2018	$	54.00
Fair value of Evergy shares issued to Great Plains Energy shareholders	$	6,963.2
Fair value of Great Plains Energy's equity compensation awards	12.5
Total purchase price	$	6,975.7

Schedule of Purchase Price Allocation

The final purchase price allocation to Great Plains Energy's assets and liabilities as of June 4, 2018, is detailed in the following table.


	(millions)
Current assets	$	2,151.7
Property, plant and equipment, net	9,179.7
Goodwill	2,336.6
Other long-term assets, excluding goodwill	1,235.9
Total assets	$	14,903.9
Current liabilities	1,673.9
Long-term liabilities, excluding long-term debt	2,895.7
Long-term debt, net	3,358.6
Total liabilities	$	7,928.2
Total purchase price	$	6,975.7

Schedule of Unaudited Pro Forma Financial Information



		2018
	(millions, except per share amounts)
Operating revenues		$	5,334.6
Net income attributable to Evergy, Inc.		714.3
Basic earnings per common share		$	2.67
Diluted earnings per common share		$	2.67

REVENUE (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Evergy's, Evergy Kansas Central's and Evergy Metro's revenues disaggregated by customer class are summarized in the following tables.


Evergy	2020		2019		2018
Revenues	(millions)
Residential	$	1,909.2	$	1,908.1	$	1,578.8
Commercial	1,641.7		1,781.6		1,356.4
Industrial	588.7		621.6		527.8
Other retail	38.5		47.1		30.6
Total electric retail	$	4,178.1	$	4,358.4	$	3,493.6
Wholesale	264.0		327.5		404.4
Transmission	318.5		309.2		308.1
Industrial steam and other	21.0		24.5		17.9
Total revenue from contracts with customers	$	4,781.6	$	5,019.6	$	4,224.0
Other	131.8		128.2		51.9
Operating revenues	$	4,913.4	$	5,147.8	$	4,275.9


Evergy Kansas Central	2020		2019		2018
Revenues	(millions)
Residential	$	801.2	$	793.9	$	846.4
Commercial	665.6		709.1		702.8
Industrial	379.9		401.3		396.4
Other retail	17.7		21.0		20.0
Total electric retail	$	1,864.4	$	1,925.3	$	1,965.6
Wholesale	215.4		239.9		346.1
Transmission	287.3		273.3		288.9
Other	2.3		5.8		6.0
Total revenue from contracts with customers	$	2,369.4	$	2,444.3	$	2,606.6
Other	48.7		63.1		8.3
Operating revenues	$	2,418.1	$	2,507.4	$	2,614.9


Evergy Metro(a)	2020		2019		2018
Revenues	(millions)
Residential	$	714.7	$	712.4	$	735.6
Commercial	717.1		786.1		794.8
Industrial	128.8		136.9		138.8
Other retail	11.7		16.3		10.4
Total electric retail	$	1,572.3	$	1,651.7	$	1,679.6
Wholesale	35.0		70.9		53.5
Transmission	13.9		17.5		14.5
Other	2.6		2.8		4.4
Total revenue from contracts with customers	$	1,623.8	$	1,742.9	$	1,752.0
Other	81.8		63.6		71.1
Operating revenues	$	1,705.6	$	1,806.5	$	1,823.1

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

RECEIVABLES (Tables)

12 Months Ended

Dec. 31, 2020

Receivables [Abstract]

Schedule of Receivables

The Evergy Companies' receivables are detailed in the following table.


	December 31
		2020		2019
Evergy		(millions)
Customer accounts receivable - billed		$	5.3	$	7.2
Customer accounts receivable - unbilled		110.0		104.0
Other receivables		177.9		127.8
Allowance for credit losses		(19.3)		(10.5)
Total		$	273.9	$	228.5
Evergy Kansas Central
Customer accounts receivable - billed		$	—	$	—
Customer accounts receivable - unbilled		50.7		49.7
Other receivables		175.7		94.5
Allowance for credit losses		(7.5)		(3.8)
Total		$	218.9	$	140.4
Evergy Metro
Customer accounts receivable - billed		$	3.3	$	3.1
Customer accounts receivable - unbilled		27.9		26.5
Other receivables		21.9		23.1
Allowance for credit losses		(8.1)		(4.6)
Total		$	45.0	$	48.1

The Evergy Companies' other receivables also included receivables from contracts with customers as summarized in the following table.


	December 31
	2020		2019
	(millions)
Evergy	$	57.5	$	42.0
Evergy Kansas Central	49.9		37.7
Evergy Metro	6.9		1.2

The Evergy Companies' accounts receivable pledged as collateral and the corresponding short-term collateralized note payable are summarized in the following table.


	December 31
	2020		2019
	(millions)
Evergy	$	360.0	$	339.0
Evergy Kansas Central	180.0		171.0
Evergy Metro	130.0		118.0

Summary of Bad Debt Expense

The change in the Evergy Companies' allowance for credit losses is summarized in the following table.


	2020		2019
Evergy	(millions)
Beginning balance January 1	$	10.5	$	9.2
Credit loss expense	24.9		27.2
Write-offs	(28.6)		(38.3)
Recoveries of prior write-offs	12.5		12.4
Ending balance December 31	$	19.3	$	10.5
Evergy Kansas Central
Beginning balance January 1	$	3.8	$	3.9
Credit loss expense	11.1		7.2
Write-offs	(10.0)		(10.7)
Recoveries of prior write-offs	2.6		3.4
Ending balance December 31	$	7.5	$	3.8
Evergy Metro
Beginning balance January 1	$	4.6	$	3.8
Credit loss expense	9.0		13.7
Write-offs	(12.4)		(19.2)
Recoveries of prior write-offs	6.9		6.3
Ending balance December 31	$	8.1	$	4.6

RATE MATTERS AND REGULATION (Tables)

12 Months Ended

Dec. 31, 2020

Regulated Operations [Abstract]

Schedule of Regulatory Assets

The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Regulatory Assets	(millions)
Pension and post-retirement costs	$	867.8	$	412.9	$	359.9	$	795.9	$	359.9	$	330.7
Debt reacquisition costs	98.9		91.3		6.8		105.8		97.3		7.5
Debt fair value adjustment	104.0		—		—		112.0		—		—
Asset retirement obligations fair value adjustment	116.2		—		—		114.3		—		—
Depreciation	70.0		52.7		9.4		55.3		55.3		—
Cost of removal	183.4		125.7		57.7		129.3		94.4		34.9
Asset retirement obligations	170.8		55.0		84.0		167.1		52.8		79.4
Analog meter unrecovered investment	24.1		24.1		—		29.9		29.9		—
Treasury yield hedges	21.5		21.5		—		22.6		22.6		—
Iatan No. 1 and common facilities	6.9		—		2.8		7.1		—		2.8
Iatan No. 2 construction accounting costs	25.4		—		12.7		26.1		—		13.1
Kansas property tax surcharge	28.9		23.7		5.2		21.7		18.7		3.0
Disallowed plant costs	14.5		14.5		—		14.8		14.8		—
La Cygne environmental costs	12.4		10.1		2.3		13.7		11.2		2.5
Deferred customer programs	16.3		5.7		8.6		18.0		6.2		8.3
Fuel recovery mechanisms	26.2		1.2		17.7		34.7		—		16.6
Solar rebates	25.9		—		1.5		39.8		—		9.0

Wolf Creek outage	10.0		5.0		5.0		31.0		15.5		15.5
Pension and other post-retirement benefit non-service costs	49.8		12.8		23.4		31.8		7.4		15.6
Retired generation facilities	128.4		—		—		130.5		—		—
Merger transition costs	37.6		18.0		13.9		42.3		20.3		15.6
Other regulatory assets	35.4		22.1		4.6		28.5		17.4		5.3
Total	2,074.4		896.3		615.5		1,972.2		823.7		559.8
Less: current portion	(206.2)		(96.2)		(82.0)		(231.7)		(93.3)		(95.4)
Total noncurrent regulatory assets	$	1,868.2	$	800.1	$	533.5	$	1,740.5	$	730.4	$	464.4

Schedule of Regulatory Liabilities


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Regulatory Liabilities	(millions)
Taxes refundable through future rates	$	2,055.7	$	1,184.5	$	650.2	$	1,656.5	$	856.4	$	568.9
Deferred regulatory gain from sale leaseback	48.1		48.1		—		53.6		53.6		—
Emission allowances	46.1		—		46.1		50.1		—		50.1
Nuclear decommissioning	319.7		138.2		181.5		267.3		116.5		150.8
Pension and post-retirement costs	50.8		31.4		13.1		59.3		31.5		20.3
Jurisdictional allowance for funds used during construction	28.7		27.0		1.7		28.7		28.7		—
La Cygne leasehold dismantling costs	29.6		29.6		—		29.6		29.6		—
Cost of removal	4.4		—		—		49.1		—		—
Kansas tax credits	—		—		—		17.0		17.0		—
Purchase power agreement	6.3		6.3		—		7.4		7.4		—

Fuel recovery mechanisms	1.3		—		—		34.1		30.2		—
Sibley AAO	18.4		—		—		10.2		—		—

Other regulatory liabilities	55.8		7.8		14.8		48.7		3.9		13.5
Total	2,664.9		1,472.9		907.4		2,311.6		1,174.8		803.6
Less: current portion	(26.1)		(11.9)		(8.0)		(63.3)		(42.3)		(11.4)
Total noncurrent regulatory liabilities	$	2,638.8	$	1,461.0	$	899.4	$	2,248.3	$	1,132.5	$	792.2

ASSET RETIREMENT OBLIGATIONS (Tables)

12 Months Ended

Dec. 31, 2020

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Change in Asset Retirement Obligation

The following table summarizes the change in the Evergy Companies' AROs for the periods ending December 31, 2020 and 2019.


	Evergy				Evergy Kansas Central				Evergy Metro
	2020		2019		2020		2019		2020		2019
	(millions)
Beginning balance January 1	$	674.1	$	687.1	$	272.9	$	281.1	$	253.6	$	261.0

Revision in timing and/or estimates	249.3		(22.3)		136.8		(12.4)		118.4		(9.9)
Settlements	(18.4)		(17.8)		(2.2)		(14.8)		(7.5)		(2.5)
Accretion	36.9		27.1		19.7		19.0		14.4		5.0
Ending balance	$	941.9	$	674.1	$	427.2	$	272.9	$	378.9	$	253.6
Less: current portion	(40.2)		(71.3)		(11.2)		(23.3)		(21.2)		(36.1)
Total noncurrent asset retirement obligation	$	901.7	$	602.8	$	416.0	$	249.6	$	357.7	$	217.5

PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2020

Property, Plant and Equipment [Abstract]

Schedule of Public Utility Property, Plant, and Equipment

The following tables summarize the property, plant and equipment of Evergy, Evergy Kansas Central and Evergy Metro.


December 31, 2020	Evergy			Evergy Kansas Central			Evergy Metro
		(millions)
Electric plant in service		$	28,914.8		$	14,095.1		$	11,161.8
Electric plant acquisition adjustment		724.3			724.3			—
Accumulated depreciation		(10,998.4)			(5,293.5)			(4,532.7)
Plant in service		18,640.7			9,525.9			6,629.1
Construction work in progress		1,153.5			589.1			433.9
Nuclear fuel, net		155.9			77.7			78.2
Plant to be retired, net (a)		0.9			0.9			—
Net property, plant and equipment		$	19,951.0		$	10,193.6		$	7,141.2

December 31, 2019	Evergy			Evergy Kansas Central			Evergy Metro
		(millions)
Electric plant in service		$	27,768.8		$	13,538.1		$	10,776.5
Electric plant acquisition adjustment		740.6			740.6			—
Accumulated depreciation		(10,293.7)			(4,951.5)			(4,272.0)
Plant in service		18,215.7			9,327.2			6,504.5
Construction work in progress		839.2			472.8			269.9
Nuclear fuel, net		128.5			63.9			64.6
Plant to be retired, net (a)		1.0			1.0			—
Net property, plant and equipment		$	19,184.4		$	9,864.9		$	6,839.0

(a) As of December 31, 2020 and 2019, represents the planned retirement of Evergy Kansas Central analog meters prior to the end of their remaining useful lives.

The following table summarizes the property, plant and equipment of VIEs for Evergy and Evergy Kansas Central.


		December 31
	2020			2019
		(millions)
Electric plant of VIEs		$	392.1		$	392.1
Accumulated depreciation of VIEs		(237.2)			(230.1)
Net property, plant and equipment of VIEs		$	154.9		$	162.0

The Evergy Companies' depreciation expense is detailed in the following table.


	2020		2019		2018
	(millions)
Evergy (a)	$	804.7	$	786.3	$	567.9
Evergy Kansas Central (a)	435.1		425.8		371.3
Evergy Metro (b)	269.5		262.7		235.3

(a) Approximately $7.1 million of depreciation expense in each of 2020, 2019 and 2018 was attributable to property, plant and equipment of VIEs.

(b) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

JOINTLY-OWNED ELECTRIC UTILITY PLANTS (Tables)

12 Months Ended

Dec. 31, 2020

Jointly Owned Electric Utility Plants [Abstract]

Schedule of Jointly Owned Utility Plants

Evergy's, Evergy Kansas Central's and Evergy Metro's share of jointly-owned electric utility plants at December 31, 2020, are detailed in the following tables.


Evergy
	Wolf Creek Unit			La Cygne Units (a)			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common			Jeffrey Energy Center			State Line
	(millions, except MW amounts)
Evergy's share		94%			100%			88%			73%			79%			100%			40%

Electric plant in service		$	4,059.1		$	2,207.6		$	773.3		$	1,404.3		$	499.7		$	2,435.4		$	115.0
Accumulated depreciation		1,970.3			779.4			265.7			459.3			127.8			984.1			80.6
Nuclear fuel, net		155.9			—			—			—			—			—			—
Construction work in progress		183.5			27.7			10.3			10.7			4.4			84.1			12.9
2021 accredited capacity-MWs		1,108			1,426			618			640			n/a			2,012			200


Evergy Kansas Central
	Wolf Creek Unit			La Cygne Units (a)			Jeffrey Energy Center		State Line
	(millions, except MW amounts)
Evergy Kansas Central's share		47%			50%		92%			40%

Electric plant in service		$	1,995.2		$	1,046.5	$	2,229.5		$	115.0
Accumulated depreciation		956.6			446.2		895.3			80.6
Nuclear fuel, net		77.7			—		—			—
Construction work in progress		77.2			10.6		77.3			12.9
2021 accredited capacity-MWs		554			713		1,837			200


Evergy Metro
	Wolf Creek Unit			La Cygne Units			Iatan No. 1 Unit			Iatan No. 2 Unit			Iatan Common
	(millions, except MW amounts)
Evergy Metro's share		47%			50%			70%			55%			61%

Electric plant in service		$	2,063.9		$	1,161.1		$	600.2		$	1,065.3		$	396.5
Accumulated depreciation		1,013.7			333.2			204.7			397.4			110.5
Nuclear fuel, net		78.2			—			—			—			—
Construction work in progress		106.3			17.1			8.3			8.0			3.1
2021 accredited capacity-MWs		554			713			492			482			n/a

PENSION PLANS AND POST-RETIREMENT BENEFITS (Tables)

12 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of Net Funded Status

Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2020	$	2,718.2	$	1,323.4	$	1,371.4	$	264.3	$	138.7	$	125.6
Service cost	78.9		27.1		51.8		2.7		1.1		1.6
Interest cost	96.8		47.0		49.1		9.2		4.8		4.4
Contribution by participants	—		—		—		9.3		1.8		7.5
Plan amendments	4.2		8.1		(3.9)		1.0		0.5		0.5
Actuarial loss	273.9		127.0		144.8		19.6		11.0		8.6
Benefits paid	(202.5)		(102.3)		(99.0)		(25.7)		(11.1)		(14.6)
Settlements	(62.9)		—		(62.9)		—		—		—
Other	(5.5)		(0.7)		(4.8)		—		—		—
PBO at December 31, 2020	$	2,901.1	$	1,429.6	$	1,446.5	$	280.4	$	146.8	$	133.6
Change in plan assets
Fair value of plan assets at January 1, 2020	$	1,732.8	$	842.1	$	890.7	$	239.9	$	120.5	$	119.4
Actual return on plan assets	209.9		99.7		110.2		20.7		13.7		7.0
Contributions by employer and participants	123.4		45.8		77.6		11.7		2.1		9.6
Benefits paid	(198.6)		(99.9)		(98.7)		(24.0)		(10.5)		(13.5)
Settlements	(62.9)		—		(62.9)		—		—		—
Other	(5.5)		(0.7)		(4.8)		—		—		—
Fair value of plan assets at December 31, 2020	$	1,799.1	$	887.0	$	912.1	$	248.3	$	125.8	$	122.5
Funded status at December 31, 2020	$	(1,102.0)	$	(542.6)	$	(534.4)	$	(32.1)	$	(21.0)	$	(11.1)


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Change in projected benefit obligation (PBO)	(millions)
PBO at January 1, 2019	$	2,553.4	$	1,258.9	$	1,272.4	$	249.3	$	133.6	$	115.7
Service cost	79.1		29.0		50.1		2.5		1.1		1.4
Interest cost	108.0		53.7		53.3		10.5		5.6		4.9
Contribution by participants	—		—		—		8.8		1.9		6.9

Actuarial loss	262.4		120.3		140.5		20.9		9.5		11.4
Benefits paid	(180.5)		(136.9)		(42.3)		(27.7)		(13.0)		(14.7)
Settlements	(96.6)		—		(96.6)		—		—		—
Other	(7.6)		(1.6)		(6.0)		—		—		—
PBO at December 31, 2019	$	2,718.2	$	1,323.4	$	1,371.4	$	264.3	$	138.7	$	125.6
Change in plan assets
Fair value of plan assets at January 1, 2019	$	1,603.4	$	804.6	$	798.8	$	223.3	$	109.7	$	113.6
Actual return on plan assets	284.0		130.5		153.5		30.0		20.0		10.0
Contributions by employer and participants	125.2		43.0		82.2		13.2		3.5		9.7
Benefits paid	(175.6)		(134.4)		(41.2)		(26.6)		(12.7)		(13.9)
Settlements	(96.6)		—		(96.6)		—		—		—
Other	(7.6)		(1.6)		(6.0)		—		—		—
Fair value of plan assets at December 31, 2019	$	1,732.8	$	842.1	$	890.7	$	239.9	$	120.5	$	119.4
Funded status at December 31, 2019	$	(985.4)	$	(481.3)	$	(480.7)	$	(24.4)	$	(18.2)	$	(6.2)

Schedule of Amounts Recognized in Balance Sheet


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Amounts recognized in the consolidated balance sheets					(millions)
Non-current asset	$	—	$	—	$	—	$	21.3	$	—	$	21.3
Current pension and other post-retirement liability	(4.4)		(2.5)		(0.8)		(1.6)		(0.8)		(0.9)
Noncurrent pension liability and other post-retirement liability	(1,097.6)		(540.1)		(533.6)		(51.8)		(20.2)		(31.5)
Net amount recognized before regulatory treatment	(1,102.0)		(542.6)		(534.4)		(32.1)		(21.0)		(11.1)
Accumulated OCI or regulatory asset/liability	566.9		408.0		216.9		4.0		1.0		(7.7)
Net amount recognized at December 31, 2020	$	(535.1)	$	(134.6)	$	(317.5)	$	(28.1)	$	(20.0)	$	(18.8)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	551.8	$	388.9	$	218.6	$	2.2	$	(0.3)	$	—
Prior service cost	15.1		19.1		(1.7)		1.8		1.3		(7.7)
Net amount recognized at December 31, 2020	$	566.9	$	408.0	$	216.9	$	4.0	$	1.0	$	(7.7)


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Amounts recognized in the consolidated balance sheets					(millions)
Non-current asset	$	—	$	—	$	—	$	15.0	$	—	$	15.0
Current pension and other post-retirement liability	(5.6)		(3.0)		(1.3)		(1.9)		(1.0)		(0.9)
Noncurrent pension liability and other post- retirement liability	(979.8)		(478.3)		(479.4)		(37.5)		(17.2)		(20.3)
Net amount recognized before regulatory treatment	(985.4)		(481.3)		(480.7)		(24.4)		(18.2)		(6.2)
Accumulated OCI or regulatory asset/liability	454.1		354.9		192.3		(4.4)		(2.9)		(13.0)
Net amount recognized at December 31, 2019	$	(531.3)	$	(126.4)	$	(288.4)	$	(28.8)	$	(21.1)	$	(19.2)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	$	439.7	$	342.3	$	189.4	$	(5.7)	$	(4.2)	$	(4.9)
Prior service cost	14.4		12.6		2.9		1.3		1.3		(8.1)
Net amount recognized at December 31, 2019	$	454.1	$	354.9	$	192.3	$	(4.4)	$	(2.9)	$	(13.0)

Schedule of Net Benefit Costs

The assets in the aforementioned trusts are not included in the table above. See Note 14 for more information on these amounts.


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	78.9	$	27.1	$	51.8	$	2.7	$	1.1	$	1.6
Interest cost	96.8		47.0		49.1		9.2		4.8		4.4
Expected return on plan assets	(105.6)		(53.1)		(54.7)		(9.3)		(6.6)		(2.7)
Prior service cost	1.8		1.6		0.8		0.5		0.5		—
Recognized net actuarial (gain) loss	46.4		33.9		45.7		0.2		—		(0.6)
Settlement and special termination benefits	11.2		—		14.3		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	129.5		56.5		107.0		3.3		(0.2)		2.7
Regulatory adjustment	29.6		5.9		(11.6)		(4.0)		(3.0)		(0.2)
Intercompany allocations	n/a		(0.2)		(22.6)		n/a		0.1		(0.3)
Net periodic benefit costs (income)	159.1		62.2		72.8		(0.7)		(3.1)		2.2
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net loss	169.7		80.4		89.3		8.2		3.9		4.3
Amortization of gain (loss)	(59.2)		(33.8)		(60.0)		(0.2)		—		0.6
Prior service cost	4.1		8.1		(3.9)		0.9		0.5		0.4
Amortization of prior service cost	(1.8)		(1.6)		(0.8)		(0.5)		(0.5)		—
Total recognized in OCI or regulatory asset/liability	112.8		53.1		24.6		8.4		3.9		5.3
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	271.9	$	115.3	$	97.4	$	7.7	$	0.8	$	7.5


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	79.1	$	29.0	$	50.1	$	2.5	$	1.1	$	1.4
Interest cost	108.0		53.7		53.3		10.5		5.6		4.9
Expected return on plan assets	(106.3)		(54.8)		(48.9)		(10.0)		(6.7)		(3.3)
Prior service cost	1.9		1.7		0.9		0.5		0.5		—
Recognized net actuarial (gain) loss	33.0		25.5		49.8		(1.2)		(0.6)		(1.4)
Settlement and special termination benefits	15.6		—		23.0		—		—		—
Net periodic benefit costs before regulatory adjustment and intercompany allocations	131.3		55.1		128.2		2.3		(0.1)		1.6
Regulatory adjustment	37.4		3.0		(19.2)		(3.4)		(3.0)		0.4
Intercompany allocations	n/a		—		(34.4)		n/a		—		(0.4)
Net periodic benefit costs (income)	168.7		58.1		74.6		(1.1)		(3.1)		1.6
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	84.7		44.6		35.9		0.9		(3.8)		4.7
Amortization of gain (loss)	(48.6)		(25.5)		(72.8)		1.2		0.6		1.4

Amortization of prior service cost	(1.9)		(1.7)		(0.9)		(0.5)		(0.5)		—
Total recognized in OCI or regulatory asset/liability	34.2		17.4		(37.8)		1.6		(3.7)		6.1
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	202.9	$	75.5	$	36.8	$	0.5	$	(6.8)	$	7.7


	Pension Benefits						Post-Retirement Benefits
Year Ended December 31, 2018	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Components of net periodic benefit costs	(millions)
Service cost	$	60.7	$	32.2	$	48.6	$	2.3	$	1.3	$	2.0
Interest cost	82.5		50.7		49.9		8.0		5.0		4.8
Expected return on plan assets	(86.4)		(55.9)		(55.5)		(8.8)		(7.0)		(2.8)
Prior service cost	0.7		0.7		0.7		0.5		0.5		0.1
Recognized net actuarial (gain) loss	32.6		32.6		45.1		(0.6)		(0.6)		(0.2)

Net periodic benefit costs before regulatory adjustment and intercompany allocations	90.1		60.3		88.8		1.4		(0.8)		3.9
Regulatory adjustment	8.3		8.8		0.7		(1.7)		(2.0)		(0.1)
Intercompany allocations	n/a		—		(21.6)		n/a		—		(1.1)
Net periodic benefit costs (income)	98.4		69.1		67.9		(0.3)		(2.8)		2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Current year net (gain) loss	67.2		(13.2)		25.9		4.9		11.7		(14.0)
Amortization of gain (loss)	(32.6)		(32.6)		(45.1)		0.6		0.6		0.2
Prior service cost	13.4		11.4		2.0		—		—		—
Amortization of prior service cost	(0.7)		(0.7)		(0.7)		(0.5)		(0.5)		(0.1)
Total recognized in OCI or regulatory asset/liability	47.3		(35.1)		(17.9)		5.0		11.8		(13.9)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	$	145.7	$	34.0	$	50.0	$	4.7	$	9.0	$	(11.2)

Schedule of Defined Benefit Plan, Plan with Projected Benefit Obligation in Excess of Plan Assets


December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,534.1	$	1,281.6	$	1,227.4
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,901.1	$	1,429.6	$	1,446.5
Fair value of plan assets	1,799.1		887.0		912.1
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,534.1	$	1,281.6	$	1,227.4
Fair value of plan assets	1,799.1		887.0		912.1
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	280.4	$	146.8	$	133.6
Fair value of plan assets	248.3		125.8		122.5


December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
ABO for all defined benefit pension plans	$	2,390.5	$	1,196.8	$	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	$	2,718.2	$	1,323.4	$	1,371.4
Fair value of plan assets	1,732.8		842.1		890.7
Pension plans with the ABO in excess of plan assets
Accumulated benefit obligation	$	2,390.5	$	1,196.8	$	1,170.2
Fair value of plan assets	1,732.8		842.1		890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated other post-retirement benefit obligation	$	264.3	$	138.7	$	125.6
Fair value of plan assets	239.9		120.5		119.4

Schedule of Defined Benefit Plan, Assumptions

The following tables provide the weighted-average assumptions used to determine benefit obligations and net costs for the Evergy Companies' pension and post-retirement benefit plans.


Weighted-average assumptions used to determine the benefit obligation at December 31, 2020	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	2.95	%	2.93	%	2.97	%	2.84	%	2.80	%	2.88	%
Rate of compensation increase	3.71	%	3.76	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.12	%	4.00	%	4.46	%	n/a		n/a		n/a

Weighted-average assumptions used to determine the benefit obligation at December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Rate of compensation increase	3.74	%	3.78	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a


Weighted-average assumptions used to determine net costs for the year ended December 31, 2020	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	3.62	%	3.61	%	3.64	%	3.56	%	3.54	%	3.58	%
Expected long-term return on plan assets	6.63	%	6.70	%	6.56	%	4.19	%	6.00	%	2.37	%
Rate of compensation increase	3.74	%	3.75	%	3.71	%	3.75	%	n/a		3.75	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a

Weighted-average assumptions used to determine net costs for the year ended December 31, 2019	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Discount rate	4.35	%	4.35	%	4.36	%	4.33	%	4.33	%	4.33	%
Expected long-term return on plan assets	6.61	%	6.75	%	6.47	%	4.44	%	6.00	%	2.94	%
Rate of compensation increase	3.76	%	4.03	%	3.64	%	3.50	%	n/a		3.50	%
Interest crediting rate for cash balance plans	4.32	%	4.21	%	4.50	%	n/a		n/a		n/a

Schedule of Expected Benefit Payments

The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid through 2030.


	Pension Benefits						Post-Retirement Benefits
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
	(millions)
2021	$	187.6	$	96.2	$	90.2	$	16.7	$	9.5	$	7.2
2022	189.6		95.5		92.8		16.4		9.3		7.1
2023	192.6		95.7		95.6		16.1		9.1		6.9
2024	193.2		95.2		96.7		15.7		8.8		6.9
2025	195.5		94.5		99.4		15.3		8.6		6.8
2026-2030	957.0		442.8		506.5		73.1		39.8		33.3

Schedule of Allocation of Plan Assets

The following table provides the target asset allocations by asset class for the Evergy Kansas Central and Evergy Metro pension and other post-retirement plan assets. [to be updated]


	Pension Benefits		Post-Retirement Benefits
	Evergy Kansas Central	Evergy Metro	Evergy Kansas Central	Evergy Metro
Domestic equities	29%	30%	33%	3%
International equities	20%	24%	22%	—%
Bonds	36%	33%	45%	85%
Mortgage & asset backed securities	—%	—%	—%	4%
Real estate investments	4%	5%	—%	—%
Other investments	11%	9%	—%	7%

The fair values of the Evergy Companies' pension plan assets at December 31, 2020 and 2019, by asset category are in the following tables.


				Fair Value Measurements Using
Description	December 31 2020			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	248.5		$	151.3		$	—		$	—		$	97.2
International equities		171.2			103.8			—			—			67.4
Bond funds		281.2			230.7			—			—			50.5



Real estate investments		46.7			—			—			—			46.7
Combination debt/equity/other fund		30.4			30.4			—			—			—
Alternative investment funds		83.6			—			—			—			83.6
Short-term investments		25.4			—			—			—			25.4


Total		$	887.0		$	516.2		$	—		$	—		$	370.8

Evergy Metro Pension Plans
Domestic equities		$	247.4		$	191.9		$	—		$	—		$	55.5
International equities		220.8			153.4			—			—			67.4
Bond funds		78.1			21.1			—			—			57.0
Corporate bonds		133.6			—			133.6			—			—
U.S. Treasury and agency bonds		73.8			61.5			12.3			—			—
Mortgage and asset backed securities		5.0			—			5.0			—			—
Real estate investments		40.2			1.6			—			—			38.6
Combination debt/equity/other fund		15.6			15.6			—			—			—
Alternative investment funds		39.7			—			—			—			39.7
Cash and cash equivalents		57.3			57.3			—			—			—
Short-term investments		1.4			—			—			—			1.4
Other		(0.8)			—			(0.8)			—			—
Total		$	912.1		$	502.4		$	150.1		$	—		$	259.6


				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Pension Plans
Domestic equities		$	233.8		$	150.6		$	—		$	—		$	83.2
International equities		162.4			101.5			—			—			60.9
Bond funds		281.7			233.0			—			—			48.7
Real estate investments		46.5			—			—			—			46.5
Combination debt/equity/other fund		30.1			30.1			—			—			—
Alternative investment funds		78.5			—			—			—			78.5
Short-term investments		9.1			—			—			—			9.1

Total		$	842.1		$	515.2		$	—		$	—		$	326.9

Evergy Metro Pension Plans
Domestic equities		$	244.8		$	195.3		$	—		$	—		$	49.5
International equities		178.7			117.7			—			—			61.0
Bond funds		71.0			15.6			—			—			55.4
Corporate bonds		123.9			—			123.9			—			—
U.S. Treasury and agency bonds		70.9			53.5			17.4			—			—
Mortgage and asset backed securities		5.7			—			5.7			—			—
Real estate investments		50.8			12.8			—			—			38.0
Combination debt/equity/other fund		11.9			11.9			—			—			—
Alternative investment funds		36.6			—			—			—			36.6
Cash and cash equivalents		92.9			92.9			—			—			—
Short-term investments		1.0			—			—			—			1.0
Other		2.5			—			2.5			—			—
Total		$	890.7		$	499.7		$	149.5		$	—		$	241.5

The fair values of the Evergy Companies' post-retirement plan assets at December 31, 2020 and 2019, by asset category are in the following tables.


				Fair Value Measurements Using
Description	December 31 2020			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	41.9		$	—		$	—		$	—		$	41.9
International equities		27.7			—			—			—			27.7
Bond funds		55.5			—			—			—			55.5







Cash and cash equivalents		0.7			0.7			—			—			—

Total		$	125.8		$	0.7		$	—		$	—		$	125.1

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	4.6		$	4.6		$	—		$	—		$	—
International equities		1.2			1.2			—			—			—
Bond funds		79.0			0.2			—			—			78.8
Corporate bonds		17.9			—			17.9			—			—
U.S. Treasury and agency bonds		13.6			5.7			7.9			—			—
Mortgage and asset backed securities		0.5			—			0.5			—			—



Cash and cash equivalents		5.4			5.4			—			—			—
Other		0.3			—			0.3			—			—
Total		$	122.5		$	17.1		$	26.6		$	—		$	78.8


				Fair Value Measurements Using
Description	December 31 2019			Level 1			Level 2			Level 3			Assets measured at NAV
		(millions)
Evergy Kansas Central Post-Retirement Benefit Plans
Domestic equities		$	40.5		$	—		$	—		$	—		$	40.5
International equities		26.0			—			—			—			26.0
Bond funds		52.9			—			—			—			52.9
Cash and cash equivalents		1.1			1.1			—			—			—
Total		$	120.5		$	1.1		$	—		$	—		$	119.4

Evergy Metro Post-Retirement Benefit Plans
Domestic equities		$	3.2		$	3.2		$	—		$	—		$	—
International equities		1.1			1.1			—			—			—
Bond funds		77.5			0.1			—			—			77.4
Corporate bonds		17.8			—			17.8			—			—
U.S. Treasury and agency bonds		11.5			4.1			7.4			—			—
Mortgage and asset backed securities		1.3			—			1.3			—			—
Cash and cash equivalents		6.7			6.7			—			—			—
Other		0.3			—			0.3			—			—
Total		$	119.4		$	15.2		$	26.8		$	—		$	77.4

Schedule of Health Care Cost Trend Rates

The cost trend assumptions are detailed in the following tables.


Assumed annual health care cost growth rates as of December 31, 2020	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.0	%	6.0	%	6.0	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Assumed annual health care cost growth rates as of December 31, 2019	Evergy		Evergy Kansas Central		Evergy Metro
Health care cost trend rate assumed for next year	6.3	%	6.3	%	6.3	%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.5	%	4.5	%	4.5	%
Year that rate reaches ultimate trend	2027		2027		2027

Schedule of Costs of Retirement Plans


	2020		2019		2018
	(millions)
Evergy	$	17.4	$	17.6	$	16.3
Evergy Kansas Central	9.6		9.6		9.9
Evergy Metro	7.8		8.0		8.3

EQUITY COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Schedule of Equity Compensation Expense and Associated Income Tax Benefits

The following table summarizes the Evergy Companies' equity compensation expense and the associated income tax benefit.


	2020		2019		2018
Evergy	(millions)
Equity compensation expense	$	15.5	$	15.5	$	30.7
Income tax benefit	2.2		3.0		1.4
Evergy Kansas Central
Equity compensation expense	7.6		6.7		24.8
Income tax benefit	1.6		1.9		1.4
Evergy Metro(a)
Equity compensation expense	5.7		5.7		6.5
Income tax benefit	0.2		0.3		0.1

(a) Evergy Metro amounts are only included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Restricted Stock Unit Activity

RSU activity for awards with performance measures for 2020 is summarized in the following table.


	Nonvested Restricted Share Units		Grant Date Fair Value*
Beginning balance January 1, 2020		197,250		$	37.87
Granted		175,991		87.98

Forfeited		(25,277)		60.55
Ending balance December 31, 2020		347,964		61.57

* weighted-average

RSU activity for awards with only service requirements for 2020 is summarized in the following table.


	Nonvested Restricted Share Units		Grant Date Fair Value*
Beginning balance January 1, 2020		233,350		$	54.16
Granted		59,539		68.92
Vested		(120,536)		53.94
Forfeited		(11,611)		59.27
Ending balance December 31, 2020		160,742		59.42

* weighted-average

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Short-term Debt

The following table summarizes the committed credit facilities (excluding receivable sale facilities discussed in Note 4) available to the Evergy Companies as of December 31, 2020 and 2019.


			Amounts Drawn
	Master Credit Facility		Commercial Paper		Letters of Credit		Cash Borrowings		Available Borrowings		Weighted Average Interest Rate on Short-Term Borrowings
December 31, 2020	(millions)
Evergy, Inc.	$	450.0	n/a		$	0.7	$	200.0	$	249.3	1.40%
Evergy Kansas Central	1,000.0		50.0		17.0		—		933.0		0.23%
Evergy Metro	600.0		—		—		—		600.0		—%
Evergy Missouri West	450.0		65.0		2.0		—		383.0		0.36%
Evergy	$	2,500.0	$	115.0	$	19.7	$	200.0	$	2,165.3

December 31, 2019
Evergy, Inc.	$	450.0	n/a		$	0.7	$	20.0	$	429.3	2.99%
Evergy Kansas Central	1,000.0		249.2		14.2		—		736.6		2.07%
Evergy Metro	600.0		199.3		—		—		400.7		2.02%
Evergy Missouri West	450.0		93.4		2.1		—		354.5		2.02%
Evergy	$	2,500.0	$	541.9	$	17.0	$	20.0	$	1,921.1

LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Debt

The Evergy Companies' long-term debt is detailed in the following tables.


December 31, 2020	Issuing Entity	Year Due	Evergy		Evergy Kansas Central		Evergy Metro
Mortgage Bonds			(millions)
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0		250.0		—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0		350.0		—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0		300.0		—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0		550.0		—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0		430.0		—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0		250.0		—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0		300.0		—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0		300.0
3.45% Series	Evergy Kansas Central, Inc.	2050	500.0		500.0		—
6.15% Series	Evergy Kansas South, Inc.	2023	50.0		50.0		—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0		175.0		—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0		100.0		—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0		250.0		—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5		—		79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0		—		400.0
2.25% Series	Evergy Metro, Inc.	2030	400.0		—		400.0
9.44% Series	Evergy Missouri West, Inc.	2021	1.1		—		—
Pollution Control Bonds
0.18% Series(b)	Evergy Kansas Central, Inc.	2032	45.0		45.0		—
0.18% Series(b)	Evergy Kansas Central, Inc.	2032	30.5		30.5		—
0.18% Series(b)	Evergy Kansas South, Inc.	2027	21.9		21.9		—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0		50.0		—
0.18% Series(b)	Evergy Kansas South, Inc.	2032	14.5		14.5		—
0.18% Series(b)	Evergy Kansas South, Inc.	2032	10.0		10.0		—
0.20% Series 2007A and 2007B(b)	Evergy Metro, Inc.	2035	146.5		—		146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4		—		23.4
Senior Notes
3.15% Series(g)	Evergy Metro, Inc.	2023	300.0		—		300.0
3.65% Series(g)	Evergy Metro, Inc.	2025	350.0		—		350.0
6.05% Series (5.78% rate)(a)(g)	Evergy Metro, Inc.	2035	250.0		—		250.0
5.30% Series(g)	Evergy Metro, Inc.	2041	400.0		—		400.0
4.20% Series(g)	Evergy Metro, Inc.	2047	300.0		—		300.0
4.20% Series(g)	Evergy Metro, Inc.	2048	300.0		—		300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9		—		—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0		—		—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0		—		—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0		—		—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0		—		—
4.85% Series	Evergy, Inc.(f)	2021	350.0		—		—
5.292% Series	Evergy, Inc.(f)	2022	287.5		—		—
2.45% Series	Evergy, Inc.	2024	800.0		—		—
2.90% Series (3.77% rate)(a)	Evergy, Inc.	2029	800.0		—		—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0		—		—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0		—		—
Fair value adjustment(e)			110.4		—		—
Current maturities(c)			(436.4)		—		—
Unamortized debt discount and debt issuance costs			(84.9)		(45.4)		(26.4)
Total excluding current maturities(d)			$	9,190.9	$	3,931.5	$	2,923.0


December 31, 2019	Issuing Entity	Year Due	Evergy		Evergy Kansas Central		Evergy Metro
Mortgage Bonds			(millions)
5.10% Series	Evergy Kansas Central, Inc.	2020	$	250.0	$	250.0	$	—
3.25% Series	Evergy Kansas Central, Inc.	2025	250.0		250.0		—
2.55% Series	Evergy Kansas Central, Inc.	2026	350.0		350.0		—
3.10% Series	Evergy Kansas Central, Inc.	2027	300.0		300.0		—
4.125% Series	Evergy Kansas Central, Inc.	2042	550.0		550.0		—
4.10% Series	Evergy Kansas Central, Inc.	2043	430.0		430.0		—
4.625% Series	Evergy Kansas Central, Inc.	2043	250.0		250.0		—
4.25% Series	Evergy Kansas Central, Inc.	2045	300.0		300.0		—
3.25% Series	Evergy Kansas Central, Inc.	2049	300.0		300.0
6.15% Series	Evergy Kansas South, Inc.	2023	50.0		50.0		—
6.53% Series	Evergy Kansas South, Inc.	2037	175.0		175.0		—
6.64% Series	Evergy Kansas South, Inc.	2038	100.0		100.0		—
4.30% Series	Evergy Kansas South, Inc.	2044	250.0		250.0		—
2.95% EIRR bonds	Evergy Metro, Inc.	2023	79.5		—		79.5
4.125% Series	Evergy Metro, Inc.	2049	400.0		—		400.0
9.44% Series	Evergy Missouri West, Inc.	2020-2021	2.3		—		—
Pollution Control Bonds
1.39% Series(b)	Evergy Kansas Central, Inc.	2032	45.0		45.0		—
1.39% Series(b)	Evergy Kansas Central, Inc.	2032	30.5		30.5		—
1.39% Series(b)	Evergy Kansas South, Inc.	2027	21.9		21.9		—
2.50% Series	Evergy Kansas South, Inc.	2031	50.0		50.0		—
1.39% Series(b)	Evergy Kansas South, Inc.	2032	14.5		14.5		—
1.39% Series(b)	Evergy Kansas South, Inc.	2032	10.0		10.0		—
1.432% Series 2007A and 2007B(b)	Evergy Metro, Inc.	2035	146.5		—		146.5
2.75% Series 2008	Evergy Metro, Inc.	2038	23.4		—		23.4
Senior Notes
3.15% Series(g)	Evergy Metro, Inc.	2023	300.0		—		300.0
3.65% Series(g)	Evergy Metro, Inc.	2025	350.0		—		350.0
6.05% Series (5.78% rate)(a)(g)	Evergy Metro, Inc.	2035	250.0		—		250.0
5.30% Series(g)	Evergy Metro, Inc.	2041	400.0		—		400.0
4.20% Series(g)	Evergy Metro, Inc.	2047	300.0		—		300.0
4.20% Series(g)	Evergy Metro, Inc.	2048	300.0		—		300.0
8.27% Series	Evergy Missouri West, Inc.	2021	80.9		—		—
3.49% Series A	Evergy Missouri West, Inc.	2025	36.0		—		—
4.06% Series B	Evergy Missouri West, Inc.	2033	60.0		—		—
4.74% Series C	Evergy Missouri West, Inc.	2043	150.0		—		—
3.74% Series	Evergy Missouri West, Inc.	2022	100.0		—		—
4.85% Series	Evergy, Inc.(f)	2021	350.0		—		—
5.292% Series	Evergy, Inc.(f)	2022	287.5		—		—
2.45% Series	Evergy, Inc.	2024	800.0		—		—
2.90% Series (3.77% rate)(a)	Evergy, Inc.	2029	800.0		—		—
Medium Term Notes
7.33% Series	Evergy Missouri West, Inc.	2023	3.0		—		—
7.17% Series	Evergy Missouri West, Inc.	2023	7.0		—		—
Fair value adjustment(e)			125.5		—		—
Current maturities(c)			(251.1)		(250.0)		—
Unamortized debt discount and debt issuance costs			(80.7)		(40.8)		(24.4)
Total excluding current maturities(d)			$	8,746.7	$	3,436.1	$	2,525.0

(a)Rate after amortizing gains/losses recognized in OCI on settlements of interest rate hedging instruments.

(b)Variable rate.

(f)Originally issued by Great Plains Energy but assumed by Evergy, Inc. as part of the merger transaction.

The following table summarizes Evergy's and Evergy Kansas Central's long-term debt of VIEs.


		December 31
	2020			2019
		(millions)
2.398% due 2021		$	18.8		$	51.1
Current maturities		(18.8)			(32.3)

Total excluding current maturities		$	—		$	18.8

Schedule of Maturities of Long-Term Debt

Evergy's, Evergy Kansas Central's and Evergy Metro's long-term debt maturities and the long-term debt maturities of VIEs for the next five years are detailed in the following table.


	2021		2022		2023		2024		2025
	(millions)
Evergy(a)	$	432.0	$	387.5	$	439.5	$	800.0	$	636.0
Evergy Kansas Central(a)	—		—		50.0		—		250.0
Evergy Metro	—		—		379.5		—		350.0
VIEs	18.8		—		—		—		—

(a) Excludes long-term debt maturities of VIEs.

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Carrying Value and Fair Value of Debt Instruments

The book value and fair value of the Evergy Companies' long-term debt and long-term debt of variable interest entities is summarized in the following table.


	December 31
	2020				2019
	Book Value		Fair Value		Book Value		Fair Value
Long-term debt(a)	(millions)
Evergy(b)	$	9,627.3	$	11,274.2	$	8,997.8	$	9,750.2
Evergy Kansas Central	3,931.5		4,801.7		3,686.1		4,078.8
Evergy Metro	2,923.0		3,591.2		2,525.0		2,932.2
Long-term debt of variable interest entities(a)
Evergy	$	18.8	$	19.1	$	51.1	$	51.5
Evergy Kansas Central	18.8		19.1		51.1		51.5

(a) Includes current maturities.

Schedule of Fair Value of Assets and Liabilities

The following tables include the Evergy Companies' balances of financial assets and liabilities measured at fair value on a recurring basis.


Description	December 31, 2020			Level 1		Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust(a)
Domestic equity funds		$	102.7	$	95.1		$	—		$	—		$	7.6
International equity funds		63.8		63.8			—			—			—
Core bond fund		40.6		40.6			—			—			—
High-yield bond fund		25.0		25.0			—			—			—
Emerging markets bond fund		21.0		21.0			—			—			—
Combination debt/equity/other fund		20.1		20.1			—			—			—
Alternative investments fund		23.2		—			—			—			23.2
Real estate securities fund		12.9		—			—			—			12.9
Cash equivalents		0.5		0.5			—			—			—
Total nuclear decommissioning trust		309.8		266.1			—			—			43.7
Rabbi trust
Core bond fund		25.6		—			—			—			25.6
Combination debt/equity/other fund		7.1		—			—			—			7.1

Total rabbi trust		32.7		—			—			—			32.7
Total		$	342.5	$	266.1		$	—		$	—		$	76.4
Evergy Metro
Assets
Nuclear decommissioning trust(a)
Equity securities		$	243.1	$	243.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		47.7		47.7			—			—			—
U.S. Agency		0.5		—			0.5			—			—
State and local obligations		4.1		—			4.1			—			—
Corporate bonds		43.1		—			43.1			—			—
Foreign governments		0.1		—			0.1			—			—
Cash equivalents		3.2		3.2			—			—			—
Other		0.5		0.5			—			—			—
Total nuclear decommissioning trust		342.3		294.5			47.8			—			—
Self-insured health plan trust(b)
Equity securities		1.7		1.7			—			—			—
Debt securities		8.0		2.8			5.2			—			—
Cash and cash equivalents		3.5		3.5			—			—			—
Total self-insured health plan trust		13.2		8.0			5.2			—			—
Total		$	355.5	$	302.5		$	53.0		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.1	$	—		$	—		$	—		$	13.1
Cash and cash equivalents		0.5		0.5			—			—			—
Total rabbi trusts		$	13.6	$	0.5		$	—		$	—		$	13.1



Evergy
Assets
Nuclear decommissioning trust(a)		$	652.1	$	560.6		$	47.8		$	—		$	43.7
Rabbi trusts		46.3		0.5			—			—			45.8
Self-insured health plan trust(b)		13.2		8.0			5.2			—			—
Total		$	711.6	$	569.1		$	53.0		$	—		$	89.5


Description	December 31, 2019			Level 1			Level 2			Level 3			NAV
Evergy Kansas Central		(millions)
Assets
Nuclear decommissioning trust(a)
Domestic equity funds		$	86.1		$	78.6		$	—		$	—		$	7.5
International equity funds		52.0			52.0			—			—			—
Core bond fund		39.3			39.3			—			—			—
High-yield bond fund		22.3			22.3			—			—			—
Emerging markets bond fund		19.4			19.4			—			—			—
Combination debt/equity/other fund		16.4			16.4			—			—			—
Alternative investments fund		23.9			—			—			—			23.9
Real estate securities fund		12.6			—			—			—			12.6
Cash equivalents		0.5			0.5			—			—			—
Total nuclear decommissioning trust		272.5			228.5			—			—			44.0
Rabbi trust
Core bond fund		25.3			—			—			—			25.3
Combination debt/equity/other fund		6.3			—			—			—			6.3
Cash equivalents		0.1			0.1			—			—			—
Total rabbi trust		31.7			0.1			—			—			31.6
Total		$	304.2		$	228.6		$	—		$	—		$	75.6
Evergy Metro
Assets
Nuclear decommissioning trust(a)
Equity securities		$	211.1		$	211.1		$	—		$	—		$	—
Debt securities
U.S. Treasury		50.3			50.3			—			—			—
U.S. Agency		0.4			—			0.4			—			—
State and local obligations		2.2			—			2.2			—			—
Corporate bonds		33.2			—			33.2			—			—
Foreign governments		0.1			—			0.1			—			—
Cash equivalents		3.1			3.1			—			—			—
Other		0.3			—			0.3			—			—
Total nuclear decommissioning trust		300.7			264.5			36.2			—			—
Self-insured health plan trust(b)
Equity securities		0.5			0.5			—			—			—
Debt securities		6.7			1.4			5.3			—			—
Cash and cash equivalents		2.7			2.7			—			—			—
Total self-insured health plan trust		9.9			4.6			5.3			—			—
Total		$	310.6		$	269.1		$	41.5		$	—		$	—
Other Evergy
Assets
Rabbi trusts
Fixed income fund		$	13.3		$	—		$	—		$	—		$	13.3
Cash and cash equivalents		0.5			0.5			—			—			—
Total rabbi trusts		$	13.8		$	0.5		$	—		$	—		$	13.3



Evergy
Assets
Nuclear decommissioning trust(a)		$	573.2		$	493.0		$	36.2		$	—		$	44.0
Rabbi trust		45.5			0.6			—			—			44.9
Self-insured health plan trust(b)		9.9			4.6			5.3			—			—
Total		$	628.6		$	498.2		$	41.5		$	—		$	88.9

(a)Fair value is based on quoted market prices of the investments held by the trust and/or valuation models.

Schedule of Fair Value Investments, Entities that Calculate NAV

The following table provides additional information on these Evergy and Evergy Kansas Central investments.


	December 31, 2020				December 31, 2019				December 31, 2020
	Fair		Unfunded		Fair		Unfunded		Redemption	Length of
	Value		Commitments		Value		Commitments		Frequency	Settlement
Evergy Kansas Central
Nuclear decommissioning trust:	(millions)
Domestic equity funds	$	7.6	$	2.2	$	7.5	$	3.3	(a)	(a)
Alternative investments fund(b)	23.2		—		23.9		—		Quarterly	65 days
Real estate securities fund(b)	12.9		—		12.6		—		Quarterly	65 days
Total	$	43.7	$	2.2	$	44.0	$	3.3
Rabbi trust:
Core bond fund	$	25.6	$	—	$	25.3	$	—	(c)	(c)
Combination debt/equity/other fund	7.1		—		6.3		—		(c)	(c)
Total	$	32.7	$	—	$	31.6	$	—
Other Evergy
Rabbi trust:
Fixed income fund	$	13.1	$	—	$	13.3	$	—	(c)	(c)
Total Evergy investments at NAV	$	89.5	$	2.2	$	88.9	$	3.3

(b)There is a holdback on final redemptions.

(c)This investment can be redeemed immediately and is not subject to any restrictions on redemptions.

Schedule of Fair Value Recurring Gain (Loss) Included in Earnings

The following table summarizes the net unrealized gains (losses) for the Evergy Companies' nuclear decommissioning trusts and rabbi trusts.



	2020		2019		2018
Evergy	(millions)
Nuclear decommissioning trust - equity securities	$	45.5	$	74.0	(54.1)
Nuclear decommissioning trust - debt securities	5.3		5.1		(0.5)
Rabbi trusts - equity securities	(5.6)		3.1		1.0
Total	$	45.2	$	82.2	$	(53.6)
Evergy Kansas Central
Nuclear decommissioning trust - equity securities	$	21.9	$	33.3	(31.8)
Rabbi trust - equity securities	(6.1)		3.2		1.0
Total	$	15.8	$	36.5	$	(30.8)
Evergy Metro(a)
Nuclear decommissioning trust - equity securities	$	23.6	$	40.7	(20.7)
Nuclear decommissioning trust - debt securities	5.3		5.1		(2.5)
Total	$	28.9	$	45.8	$	(23.2)

COMMITMENTS AND CONTINGENCIES (Tables)

12 Months Ended

Dec. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Obligation


Evergy
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	311.2	$	118.3	$	134.6	$	97.6	$	88.4		$	94.0		$	844.1
Power	62.4		62.6		63.2		57.6		58.0			349.7			653.5
Other	135.4		25.7		19.3		23.6		21.9			86.0			311.9
Total contractual commitments	$	509.0	$	206.6	$	217.1	$	178.8	$	168.3		$	529.7		$	1,809.5


Evergy Kansas Central
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	149.3	$	74.9	$	85.5	$	66.8	$	62.3		$	56.0		$	494.8
Power	1.4		0.9		0.9		0.9		0.9			4.4			9.4
Other	66.6		9.1		8.2		4.3		2.9			—			91.1
Total contractual commitments	$	217.3	$	84.9	$	94.6	$	72.0	$	66.1		$	60.4		$	595.3


Evergy Metro
	2021		2022		2023		2024		2025		After 2025			Total
Purchase commitments	(millions)
Fuel	$	142.8	$	38.8	$	46.3	$	27.9	$	23.2		$	38.0		$	317.0
Power	34.9		35.1		35.3		29.2		29.2			196.1			359.8
Other	55.0		15.2		10.1		18.8		18.5			81.4			199.0
Total contractual commitments	$	232.7	$	89.1	$	91.7	$	75.9	$	70.9		$	315.5		$	875.8

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Tables)

12 Months Ended

Dec. 31, 2020

The operating expenses and capital costs billed for jointly-owned plants and shared services are detailed in the following table.



	2020		2019		2018
	(millions)
Evergy Kansas Central billings to Evergy Missouri West(a)	$	37.6	$	24.9	$	12.3
Evergy Metro billings to Evergy Missouri West	168.7		172.8		183.2
Evergy Kansas Central billings to Evergy Metro(a)	34.7		40.6		17.5
Evergy Metro billings to Evergy Kansas Central(a)	130.8		154.9		82.9

The following table summarizes Evergy Kansas Central's and Evergy Metro's related party net receivables and payables.


	December 31

	2020		2019
Evergy Kansas Central	(millions)
Net receivable from Evergy	$	0.1	$	6.9
Net payable to Evergy Metro	(21.7)		(14.9)
Net receivable from Evergy Missouri West	6.6		3.1

Evergy Metro
Net receivable from (payable to) Evergy	$	15.7	$	(4.3)
Net receivable from Evergy Kansas Central	21.7		14.9
Net receivable from Evergy Missouri West	188.1		78.7

The following table summarizes Evergy Kansas Central's and Evergy Metro's income taxes receivable from (payable to) Evergy.


	December 31

	2020		2019
Evergy Kansas Central	(millions)
Income taxes receivable from Evergy	$	25.3	$	37.9

Evergy Metro
Income taxes receivable from (payable to) Evergy	$	3.2	$	(14.1)

The following table summarizes Evergy Metro's right-of-use assets and related liabilities on its consolidated balance sheet.


	December 31

	2020		2019
Evergy Metro	(millions)
Right-of-use asset recorded within other long-term assets	$	28.9	$	29.5
Lease liability recorded in other current liabilities	0.7		0.6
Lease liability recorded in other long-term liabilities	28.2		28.9

SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule of Common Stock Repurchase Program

The following table summarizes the ASRs completed as part of Evergy's common stock repurchase program.


Date ASR Entered	Final Settlement Date	Amount		Shares Delivered
		(millions)
August 2018	October/November 2018	$	450.0	7.9
November 2018	February 2019	475.0		8.3
March 2019	June 2019	450.0		7.8
June 2019	September 2019	500.0		8.1
September 2019	November/December 2019	500.0		7.8

VARIABLE INTEREST ENTITIES (Tables)

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

The following table summarizes the assets and liabilities related to the VIE described above that are recorded on Evergy's and Evergy Kansas Central's consolidated balance sheets.


	December 31
	2020		2019
Assets:	(millions)
Property, plant and equipment of variable interest entities, net	$	154.9	$	162.0
Liabilities:
Current maturities of long-term debt of variable interest entities	$	18.8	$	32.3
Accrued interest(a)	0.1		0.3
Long-term debt of variable interest entities, net	—		18.8

(a)Included in accrued interest on Evergy's and Evergy Kansas Central's consolidated balance sheets.

- Definition

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

+ References + Details

TAXES (Tables)

12 Months Ended

Dec. 31, 2020

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

Components of income tax expense are detailed in the following tables.


Evergy	2020		2019		2018
Current income taxes	(millions)
Federal	$	(26.8)	$	(39.5)	$	(67.4)
State	2.1		15.0		2.2
Total	(24.7)		(24.5)		(65.2)
Deferred income taxes
Federal	73.1		93.2		160.1
State	59.8		27.5		(32.3)
Total	132.9		120.7		127.8





Investment tax credit
Deferral	—		5.2		—
Amortization	(6.0)		(4.4)		(3.6)
Total	(6.0)		0.8		(3.6)
Income tax expense	$	102.2	$	97.0	$	59.0


Evergy Kansas Central	2020		2019		2018
Current income taxes	(millions)
Federal	$	14.5	$	37.9	$	(0.3)
State	(5.3)		2.6		(1.8)
Total	9.2		40.5		(2.1)
Deferred income taxes
Federal	(16.7)		(8.9)		43.5
State	168.1		18.4		(42.9)
Total	151.4		9.5		0.6




Investment tax credit
Deferral	—		5.2		—
Amortization	(4.8)		(3.1)		(2.8)
Total	(4.8)		2.1		(2.8)
Income tax expense (benefit)	$	155.8	$	52.1	$	(4.3)


Evergy Metro(a)	2020		2019		2018
Current income taxes	(millions)
Federal	$	(0.2)	$	43.9	$	29.8
State	10.8		22.4		8.9
Total	10.6		66.3		38.7
Deferred income taxes
Federal	29.8		(24.5)		(3.4)
State	(32.2)		(5.0)		53.0
Total	(2.4)		(29.5)		49.6




Investment tax credit

Amortization	(1.1)		(1.1)		(1.0)
Total	(1.1)		(1.1)		(1.0)
Income tax expense	$	7.1	$	35.7	$	87.3

(a) Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Effective Income Tax Rate Reconciliation

Effective income tax rates reflected in the financial statements and the reasons for their differences from the statutory federal rates are detailed in the following tables.


Evergy	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(1.6)		(1.8)		(1.9)
State income taxes	4.3		5.0		4.9
Flow through depreciation for plant-related differences	(5.3)		(4.5)		0.8
Federal tax credits	(4.6)		(4.9)		(6.4)
Non-controlling interest	(0.3)		(0.4)		(0.4)
AFUDC equity	(0.5)		(0.1)		(0.1)
Amortization of federal investment tax credits	(0.6)		(0.5)		(0.6)
Changes in uncertain tax positions, net	—		(0.2)		0.1
Federal or state tax rate change	1.9		—		(8.7)
Valuation allowance	(0.2)		(1.0)		0.4
Stock compensation	(0.1)		0.1		(0.4)
Officer compensation limitation	0.2		0.1		1.2
Other	(0.2)		(0.4)		(0.2)
Effective income tax rate	14.0	%	12.4	%	9.7	%


Evergy Kansas Central	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(2.8)		(3.3)		(3.3)
State income taxes	3.8		5.3		5.0
Flow through depreciation for plant-related differences	(0.1)		(0.1)		1.6
Federal tax credits	(7.1)		(7.4)		(10.4)
Non-controlling interest	(0.6)		(0.8)		(0.6)
AFUDC equity	(0.5)		(0.1)		(0.2)
Amortization of federal investment tax credits	(0.7)		(0.7)		(0.8)
Changes in uncertain tax positions, net	—		(0.4)		0.1
Federal or state tax rate change	27.8		—		(15.3)
Valuation allowance	—		(0.4)		0.5
Stock compensation	(0.1)		(0.1)		(0.8)
Officer compensation limitation	—		—		1.8
Other	(0.9)		(0.3)		0.2
Effective income tax rate	39.8	%	12.7	%	(1.2)	%


Evergy Metro(a)	2020		2019		2018
Federal statutory income tax	21.0	%	21.0	%	21.0	%
COLI policies	(0.3)		(0.2)		(0.2)
State income taxes	4.9		4.7		5.5
Flow through depreciation for plant-related differences	(10.0)		(9.4)		(2.5)
Federal tax credits	(1.9)		(2.5)		(2.1)
AFUDC equity	(0.5)		(0.2)		(0.1)
Amortization of federal investment tax credits	(0.4)		(0.4)		(0.4)

Federal or state tax rate change	(10.5)		—		14.1

Stock compensation	(0.4)		—		—
Officer compensation limitation	0.4		0.3		0.6
Other	—		(1.0)		(1.0)
Effective income tax rate	2.3	%	12.3	%	34.9	%

(a)Evergy Metro amounts are included in consolidated Evergy from June 4, 2018, the date of the closing of the merger, and thereafter.

Schedule of Deferred Income Tax Assets and Liabilities

The tax effects of major temporary differences resulting in deferred income tax assets (liabilities) in the consolidated balance sheets is in the following table.


	December 31
	2020						2019
	Evergy		Evergy Kansas Central		Evergy Metro		Evergy		Evergy Kansas Central		Evergy Metro
Deferred tax assets:	(millions)
Tax credit carryforward	$	379.6	$	176.5	$	195.9	$	548.9	$	337.3	$	204.4
Income taxes refundable to customers, net	418.2		237.5		132.8		466.3		234.3		176.2
Deferred employee benefit costs	227.6		105.4		117.9		197.0		93.4		120.4
Net operating loss carryforward	51.0		—		0.2		163.4		23.1		61.9
Deferred state income taxes	145.9		101.7		37.8		64.4		64.4		—
Alternative minimum tax carryforward	—		—		—		37.9		13.4		—
Accrued liabilities	152.7		61.8		61.0		80.4		14.5		29.1
Other	181.0		91.4		44.8		183.2		99.1		55.1
Total deferred tax assets before valuation allowance	1,556.0		774.3		590.4		1,741.5		879.5		647.1
Valuation allowances	(14.4)		—		—		(17.5)		—		—
Total deferred tax assets, net	1,541.6		774.3		590.4		1,724.0		879.5		647.1
Deferred tax liabilities:
Plant-related	(2,693.7)		(1,341.2)		(972.1)		(3,004.8)		(1,428.3)		(1,143.2)
Deferred employee benefit costs	(171.4)		(75.6)		(76.3)		(173.3)		(93.4)		(79.5)
ARO regulatory assets	(136.7)		(49.9)		(54.3)		(102.3)		(53.4)		(13.8)
Acquisition premium	(46.9)		(46.9)		—		(68.2)		(68.2)		—
Other	(157.7)		(85.2)		(46.5)		(119.8)		(53.9)		(53.4)
Total deferred tax liabilities	(3,206.4)		(1,598.8)		(1,149.2)		(3,468.4)		(1,697.2)		(1,289.9)
Net deferred income tax liabilities	$	(1,664.8)	$	(824.5)	$	(558.8)	$	(1,744.4)	$	(817.7)	$	(642.8)

Summary of Related Tax Benefit Amounts


	Amount of Benefit
Year of Origin	Evergy		Evergy Kansas Central		Evergy Metro
	(millions)


2003	0.1		—		—
2004	0.1		—		—
2005	0.1		—		—
2006	0.1		—		—
2007	0.1		—		—
2008	27.4		0.5		26.6
2009	47.7		0.2		47.3
2010	18.3		—		18.2
2011	13.3		—		13.2
2012	12.8		2.0		10.7
2013	24.3		11.3		12.9
2014	24.1		10.7		13.0
2015	24.7		10.9		13.2
2016	27.1		11.0		12.4
2017	43.9		35.1		8.2
2018	43.9		36.3		7.5
2019	37.7		30.9		6.7
2020	33.9		27.6		6.0
	$	379.6	$	176.5	$	195.9

Summary of Operating Loss Carryforwards

The year of origin of Evergy's related tax benefit amounts for federal NOL carryforwards as of December 31, 2020 are detailed in the following table.


Year of Origin	Amount of Benefit
	(millions)




2005	$	10.2
2006	32.0
	$	42.2

LEASES (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Schedule of Lease Expense

The Evergy Companies’ lease expense is detailed in the following table.


Evergy	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.7	$	5.2
Interest on lease liabilities	3.1		2.9
Operating lease costs	22.9		23.8
Short-term lease costs	2.1		4.0
Variable lease costs for renewable purchase power agreements	296.6		313.0
Total lease costs	$	332.4	$	348.9


Evergy Kansas Central	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	7.2	$	5.0
Interest on lease liabilities	2.8		2.7
Operating lease costs	11.9		13.2
Short-term lease costs	0.5		1.2
Variable lease costs for renewable purchase power agreements	135.6		130.8
Total lease costs	$	158.0	$	152.9


Evergy Metro	2020		2019
Finance lease costs	(millions)
Amortization of right-of-use assets	$	0.3	$	0.1
Interest on lease liabilities	0.1		0.1
Operating lease costs	9.3		9.2
Short-term lease costs	1.5		2.6
Variable lease costs for renewable purchase power agreements	112.2		129.2
Total lease costs	$	123.4	$	141.2

Supplemental cash flow information related to the Evergy Companies' leases is detailed in the following table.


Evergy	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	22.2	$	21.7
Operating cash flows from finance leases	2.8		2.8
Financing cash flows from finance leases	5.6		5.0
Right-of-use assets obtained in exchange for new operating lease liabilities	6.9		10.4
Right-of-use assets obtained in exchange for new finance lease liabilities	5.6		8.3


Evergy Kansas Central	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	12.9	$	13.7
Operating cash flows from finance leases	2.5		2.6
Financing cash flows from finance leases	5.1		4.8
Right-of-use assets obtained in exchange for new operating lease liabilities	6.6		6.1
Right-of-use assets obtained in exchange for new finance lease liabilities	4.0		8.3


Evergy Metro	2020		2019
Cash paid for amounts included in the measurement of lease liabilities:	(millions)
Operating cash flows from operating leases	$	10.8	$	9.9
Operating cash flows from finance leases	0.1		0.1
Financing cash flows from finance leases	0.4		0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	0.3		2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	1.6		—

Schedule of Payments for Finance Leases

Payments and other supplemental information for finance leases as of December 31, 2020, are detailed in the following table.


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	8.8		$	8.0		$	0.6
2022	7.3			6.5			0.6
2023	6.6			5.8			0.6
2024	5.3			4.6			0.6
2025	4.6			4.1			0.2
After 2025	42.4			41.2			0.6
Total finance lease payments	75.0			70.2			3.2
Amounts representing imputed interest	(23.7)			(22.7)			(0.6)
Present value of lease payments	51.3			47.5			2.6
Less: current portion	(6.0)			(5.6)			(0.4)
Total long-term obligations under finance leases	$	45.3		$	41.9		$	2.2

Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$	314.1		$	53.9		$	2.6

Weighted-average remaining lease term (years)	13.5			14.1			5.9
Weighted-average discount rate	5.6		%	5.5		%	4.9		%

Schedule of Lease Payments for Operating Leases

Lease payments and other supplemental information for operating leases as of December 31, 2020, are detailed in the following table.


	Evergy			Evergy Kansas Central			Evergy Metro
	(millions)
2021	$	18.5		$	10.1		$	10.1
2022	15.3			7.7			9.3
2023	12.2			5.0			8.8
2024	10.4			3.5			8.5
2025	7.9			1.5			8.3
After 2025	37.3			0.4			74.5
Total operating lease payments	101.6			28.2			119.5
Amounts representing imputed interest	(14.4)			(0.8)			(31.4)
Present value of lease payments	87.2			27.4			88.1
Less: current portion	(14.5)			(8.2)			(6.7)
Total long-term obligations under operating leases	$	72.7		$	19.2		$	81.4

Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$	93.2		$	34.4		$	71.3

Weighted-average remaining lease term (years)	8.3			3.4			15.3
Weighted-average discount rate	3.7		%	2.9		%	4.1		%

QUARTERLY OPERATING RESULTS (UNAUDITED) (Tables)

12 Months Ended

Dec. 31, 2020

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information


	Quarter
Evergy	1st		2nd		3rd		4th
2020	(millions, except per share amounts)
Operating revenue	$	1,116.7	$	1,184.7	$	1,517.6	$	1,094.4
Operating income	197.5		271.7		521.7		153.0
Net income	72.2		136.3		367.5		54.0
Net income attributable to Evergy, Inc.	69.4		133.4		364.5		51.0
Basic and diluted earnings per common share	0.31		0.59		1.60		0.22

2019
Operating revenue	$	1,216.9	$	1,221.7	$	1,577.6	$	1,131.6
Operating income	209.6		271.7		538.7		165.8
Net income	103.4		144.6		370.9		66.7
Net income attributable to Evergy, Inc.	99.5		139.7		366.8		63.9
Basic and diluted earnings per common share	0.39		0.57		1.56		0.28


	Quarter
Evergy Kansas Central	1st		2nd		3rd		4th
2020	(millions)
Operating revenue	$	560.1	$	570.8	$	733.6	$	553.6
Operating income	114.5		121.2		240.7		90.9
Net income (loss)	55.2		(37.6)		173.1		45.1
Net income (loss) attributable to Evergy Kansas Central, Inc.	52.4		(40.5)		170.1		42.1
2019
Operating revenue	$	596.8	$	585.5	$	749.0	$	576.1
Operating income	124.3		127.6		242.4		102.2
Net income	68.3		67.2		168.2		55.4
Net income attributable to Evergy Kansas Central, Inc.	64.4		62.3		164.1		52.6


	Quarter
Evergy Metro	1st		2nd		3rd		4th
2020	(millions)
Operating revenue	$	375.5	$	424.3	$	528.5	$	377.3
Operating income	63.7		112.5		204.4		53.7
Net income	25.6		102.9		147.7		22.5
2019
Operating revenue	$	425.4	$	437.0	$	568.8	$	375.3
Operating income	56.9		101.9		215.5		52.2
Net income	16.0		59.4		151.9		27.9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Organization (Details) customer in Millions	12 Months Ended
	Dec. 31, 2020 subsidiary kilovolt_line customer mi MW
Summary Of Accounting Policies [Line Items]
Owned generating capacity and renewable purchased power \| MW	15,400
Number of customers served \| customer	1.6
Prairie Wind Transmission, LLC
Summary Of Accounting Policies [Line Items]
Transmission line length \| mi	108
Transmission line electrical potential \| kilovolt_line	345
Transource Energy, LLC \| Evergy Transmission Company LLC
Summary Of Accounting Policies [Line Items]
Ownership percentage	13.50%
Prairie Wind Transmission, LLC \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Ownership percentage	50.00%
Evergy Kansas South Inc \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Number of active wholly owned subsidiaries \| subsidiary	1
AEP Transmission Holding Company, LLC \| Transource Energy, LLC
Summary Of Accounting Policies [Line Items]
Ownership interest	86.50%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Fuel Inventory and Supplies (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Inventory [Line Items]
Fuel inventory	$ 145.0	$ 146.4
Supplies	359.5	335.2
Fuel inventory and supplies	504.5	481.6
Evergy Kansas Central
Inventory [Line Items]
Fuel inventory	79.3	80.2
Supplies	197.1	186.2
Fuel inventory and supplies	276.4	266.4
Evergy Metro
Inventory [Line Items]
Fuel inventory	44.9	46.1
Supplies	125.5	116.9
Fuel inventory and supplies	$ 170.4	$ 163.0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance For Funds Used During Construction (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 16.5	$ 14.5	$ 10.4
AFUDC equity funds	17.2	2.2	3.1
Total	33.7	16.7	13.5
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	8.5	7.5	6.6
AFUDC equity funds	9.1	0.0	2.9
Total	$ 17.6	$ 7.5	$ 9.5
Public utilities, allowance for funds used during construction, rate	4.70%	3.00%	3.30%
Evergy Metro
Property, Plant and Equipment [Line Items]
AFUDC borrowed funds	$ 6.0	$ 4.3	$ 4.9
AFUDC equity funds	8.0	2.2	1.4
Total	$ 14.0	$ 6.5	$ 6.3
Public utilities, allowance for funds used during construction, rate	5.20%	4.60%	3.90%
Evergy Missouri West
Property, Plant and Equipment [Line Items]
Public utilities, allowance for funds used during construction, rate	3.50%	3.70%	2.90%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation rates average	3.00%
Regulatory assets	$ 2,074.4	$ 1,972.2
Depreciation expense reflected in retail rates	$ 9.0
Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	8 years
Transmission facilities	15 years
Distribution facilities	8 years
Other	5 years
Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	87 years
Transmission facilities	94 years
Distribution facilities	73 years
Other	84 years
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 896.3	823.7
Evergy Kansas Central \| Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	8 years
Transmission facilities	36 years
Distribution facilities	19 years
Other	7 years
Evergy Kansas Central \| Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	87 years
Transmission facilities	94 years
Distribution facilities	73 years
Other	84 years
Evergy Metro
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 615.5	559.8
Evergy Metro \| Minimum
Property, Plant and Equipment [Line Items]
Generating facilities	20 years
Transmission facilities	15 years
Distribution facilities	8 years
Other	5 years
Evergy Metro \| Maximum
Property, Plant and Equipment [Line Items]
Generating facilities	60 years
Transmission facilities	70 years
Distribution facilities	55 years
Other	50 years
Retired Generation Facilities
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 128.4	130.5
Retired Generation Facilities \| Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Regulatory assets	0.0	0.0
Retired Generation Facilities \| Evergy Metro
Property, Plant and Equipment [Line Items]
Regulatory assets	$ 0.0	$ 0.0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Corporate-Owned Life Insurance (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Cash surrender value of policies	$ 1,369.6	$ 1,370.0
Borrowings against policies	(1,237.6)	(1,237.1)
Corporate-owned life insurance, net	$ 132.0	$ 132.9

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Income (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	$ (58.6)	$ (55.6)	$ (47.8)
Other	(19.6)	(21.3)	(30.9)
Other expense	(78.2)	(76.9)	(78.7)
Evergy Kansas Central
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(21.2)	(20.1)	(23.5)
Other	(17.7)	(20.0)	(23.3)
Other expense	(38.9)	(40.1)	(46.8)
Evergy Metro
Other Income Expense Net [Line Items]
Non-service cost component of net benefit cost	(24.2)	(20.9)	(25.9)
Other	(1.3)	(0.5)	(5.0)
Other expense	$ (25.5)	$ (21.4)	$ (30.9)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Net income	$ 54.0	$ 367.5	$ 136.3	$ 72.2	$ 66.7	$ 370.9	$ 144.6	$ 103.4	$ 630.0	$ 685.6	$ 546.0
Less: Net income attributable to noncontrolling interests									11.7	15.7	10.2
Net income attributable to Evergy, Inc.	$ 51.0	$ 364.5	$ 133.4	$ 69.4	$ 63.9	$ 366.8	$ 139.7	$ 99.5	$ 618.3	$ 669.9	$ 535.8
Common Shares Outstanding
Weighted average number of common shares outstanding - basic (in shares)									227.2	239.5	213.9
Add: effect of dilutive securities (in shares)									0.3	0.4	0.2
Diluted average number of common shares outstanding (in shares)									227.5	239.9	214.1
Basic earnings per common share (in dollars per share)									$ 2.72	$ 2.80	$ 2.50
Diluted EPS (in dollars per share)									$ 2.72	$ 2.79	$ 2.50

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Antidilutive Securities (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	127,884	785	0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash paid for (received from):
Interest, net of amount capitalized	$ 367.6	$ 329.5	$ 255.9
Income taxes, net of refunds	(46.5)	(5.2)	(0.9)
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	463.3	186.0	(7.8)
Non-cash financing transactions:
Issuance of stock for compensation and reinvested dividends	0.9	(0.3)	0.5
Variable Interest Entities
Cash paid for (received from):
Interest of VIEs	0.8	1.6	2.3
Evergy Kansas Central
Cash paid for (received from):
Interest, net of amount capitalized	157.5	143.0	155.3
Income taxes, net of refunds	4.7	29.9	37.5
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	235.4	92.1	(32.5)
Evergy Kansas Central \| Variable Interest Entities
Cash paid for (received from):
Interest of VIEs	0.8	1.6	2.3
Evergy Metro
Cash paid for (received from):
Interest, net of amount capitalized	109.9	118.4	129.4
Income taxes, net of refunds	4.8	77.0	31.2
Non-cash investing transactions:
Property, plant and equipment additions (reductions)	$ 192.5	$ 80.7	$ 19.2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Dividends Declared (Details) - $ / shares	1 Months Ended	12 Months Ended
	Feb. 25, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)		$ 2.05	$ 1.93	$ 1.735
Common Stock \| Subsequent Event
Dividends Payable [Line Items]
Dividends declared on common stock (in dollars per share)	$ 0.535

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Details) - ASU 2016-02 $ in Millions	Jan. 01, 2019 USD ($)
Summary Of Accounting Policies [Line Items]
Lease asset	$ 110
Lease liability	110
Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Lease asset	40
Lease liability	40
Evergy Metro
Summary Of Accounting Policies [Line Items]
Lease asset	80
Lease liability	$ 80

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Narrative (Details) $ in Millions		12 Months Ended
	Jun. 04, 2018	Dec. 31, 2018 USD ($)
Evergy Kansas Central
Anticipated Merger With Westar Energy, Inc. [Line Items]
Conversion ratio	1
Great Plains Energy
Anticipated Merger With Westar Energy, Inc. [Line Items]
Conversion ratio	0.5981
Revenue of acquiree since acquisition		$ 1,661.1
Earnings or loss of acquiree since acquisition date, actual		236.2
Merger-related costs		$ 148.0

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Schedule of Pre-tax Costs and Deferrals (Details) - Great Plains Energy $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Business Acquisition [Line Items]
One-time bill credits	$ (59.7)
Annual bill credits	(10.5)
Total impact to operating revenues	(70.2)
Charitable contributions and community support	24.7
Voluntary severance and accelerated equity compensation	47.9
Other transaction and transition costs	51.0
Reallocation and deferral of merger transition costs	(47.8)
Total impact to operating and maintenance expense	75.8
Total	(146.0)
Evergy Kansas Central
Business Acquisition [Line Items]
One-time bill credits	(23.1)
Annual bill credits	(7.9)
Total impact to operating revenues	(31.0)
Charitable contributions and community support	0.0
Voluntary severance and accelerated equity compensation	44.2
Other transaction and transition costs	21.5
Reallocation and deferral of merger transition costs	(13.8)
Total impact to operating and maintenance expense	51.9
Total	(82.9)
Evergy Metro
Business Acquisition [Line Items]
One-time bill credits	(22.4)
Annual bill credits	(2.6)
Total impact to operating revenues	(25.0)
Charitable contributions and community support	0.0
Voluntary severance and accelerated equity compensation	2.6
Other transaction and transition costs	2.1
Reallocation and deferral of merger transition costs	(23.2)
Total impact to operating and maintenance expense	(18.5)
Total	$ (6.5)

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Purchase Price Allocation (Details) $ / shares in Units, $ in Millions	Jun. 04, 2018 USD ($) $ / shares shares
Business Acquisition [Line Items]
Common stock outstanding (in shares)	215,800,074
Awards outstanding (in shares)	(204,825)
Great Plains Energy shares to be converted to Evergy shares (in shares)	215,595,249
Great Plains Energy
Business Acquisition [Line Items]
Exchange ratio	0.5981
Number of shares issued (in shares)	128,947,518
Closing price (in dollars per share) \| $ / shares	$ 54.00
Total purchase price \| $	$ 6,975.7
Common Stock \| Great Plains Energy
Business Acquisition [Line Items]
Fair value of shares issued \| $	6,963.2
Share-based Payment Arrangement \| Great Plains Energy
Business Acquisition [Line Items]
Fair value of shares issued \| $	$ 12.5

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Schedule Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Jun. 04, 2018
Business Acquisition [Line Items]
Goodwill	$ 2,336.6	$ 2,336.6
Great Plains Energy
Business Acquisition [Line Items]
Current assets			$ 2,151.7
Property, plant and equipment, net			9,179.7
Goodwill			2,336.6
Other long-term assets, excluding goodwill			1,235.9
Total assets			14,903.9
Current liabilities			1,673.9
Long-term liabilities, excluding long-term debt			2,895.7
Long-term debt, net			3,358.6
Total liabilities			7,928.2
Total purchase price			$ 6,975.7

MERGER OF GREAT PLAINS ENERGY AND EVERGY KANSAS CENTRAL - Unaudited Pro Forma Financial Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Diluted earnings per common share (in dollars per share) \| $ / shares	$ 2.67
Great Plains Energy
Business Acquisition [Line Items]
Operating revenues	$ 5,334.6
Net income attributable to Evergy, Inc.	$ 714.3
Basic earnings per common share (in dollars per share) \| $ / shares	$ 2.67
Acquisition-related Costs
Business Acquisition [Line Items]
Merger-related, after tax costs	$ 74.7
Merger-related, reductions of revenues for customer bill credits	44.4
Merger contingent, after-tax mark-to-market interest rate swap gains	$ 36.6

REVENUE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
REVENUE (Details) - USD ($) $ in Millions	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									$ 4,781.6	$ 5,019.6	$ 4,224.0
Other									131.8	128.2	51.9
Operating revenues	$ 1,094.4	$ 1,517.6	$ 1,184.7	$ 1,116.7	$ 1,131.6	$ 1,577.6	$ 1,221.7	$ 1,216.9	4,913.4	5,147.8	4,275.9
Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									2,369.4	2,444.3	2,606.6
Other									48.7	63.1	8.3
Operating revenues	553.6	733.6	570.8	560.1	576.1	749.0	585.5	596.8	2,418.1	2,507.4	2,614.9
Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,623.8	1,742.9	1,752.0
Other									81.8	63.6	71.1
Operating revenues	$ 377.3	$ 528.5	$ 424.3	$ 375.5	$ 375.3	$ 568.8	$ 437.0	$ 425.4	1,705.6	1,806.5	1,823.1
Residential
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,909.2	1,908.1	1,578.8
Residential \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									801.2	793.9	846.4
Residential \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									714.7	712.4	735.6
Commercial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,641.7	1,781.6	1,356.4
Commercial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									665.6	709.1	702.8
Commercial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									717.1	786.1	794.8
Industrial
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									588.7	621.6	527.8
Industrial \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									379.9	401.3	396.4
Industrial \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									128.8	136.9	138.8
Other retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									38.5	47.1	30.6
Other retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									17.7	21.0	20.0
Other retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									11.7	16.3	10.4
Total electric retail
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									4,178.1	4,358.4	3,493.6
Total electric retail \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,864.4	1,925.3	1,965.6
Total electric retail \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									1,572.3	1,651.7	1,679.6
Wholesale
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									264.0	327.5	404.4
Wholesale \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									215.4	239.9	346.1
Wholesale \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									35.0	70.9	53.5
Transmission
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									318.5	309.2	308.1
Transmission \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									287.3	273.3	288.9
Transmission \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									13.9	17.5	14.5
Industrial steam and other
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									21.0	24.5	17.9
Industrial steam and other \| Evergy Kansas Central
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									2.3	5.8	6.0
Industrial steam and other \| Evergy Metro
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers									$ 2.6	$ 2.8	$ 4.4

RECEIVABLES (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	$ 177.9	$ 127.8
Allowance for credit losses	(19.3)	(10.5)
Total	273.9	228.5
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	175.7	94.5
Allowance for credit losses	(7.5)	(3.8)
Total	218.9	140.4
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables	21.9	23.1
Allowance for credit losses	(8.1)	(4.6)
Total	45.0	48.1
Customer accounts receivable \| Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	5.3	7.2
Customer accounts receivable \| Billed \| Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	0.0	0.0
Customer accounts receivable \| Billed \| Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	3.3	3.1
Customer accounts receivable \| Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	110.0	104.0
Customer accounts receivable \| Unbilled \| Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	50.7	49.7
Customer accounts receivable \| Unbilled \| Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customer accounts receivable	$ 27.9	$ 26.5

RECEIVABLES - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Entity Information [Line Items]
Other receivables, contracts with customers	$ 57.5	$ 42.0
Accounts receivable pledged as collateral	360.0	339.0
Evergy Kansas Central
Entity Information [Line Items]
Other receivables, contracts with customers	49.9	37.7
Accounts receivable pledged as collateral	180.0	171.0
Evergy Metro
Entity Information [Line Items]
Other receivables, contracts with customers	6.9	1.2
Accounts receivable pledged as collateral	130.0	$ 118.0
Maximum amount of outstanding principal under receivables agreement	130.0
Borrowings From Mid October Through Mid June \| Evergy Kansas Central
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	185.0
Borrowing From Mid June Through Expiration \| Evergy Kansas Central
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	200.0
Borrowing From Mid June Through Expiration \| Evergy Missouri West
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	65.0
Borrowings From Mid-November Through Mid-June \| Evergy Missouri West
Entity Information [Line Items]
Maximum amount of outstanding principal under receivables agreement	$ 50.0

RECEIVABLES - Allowance for Credit Loses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance January 1	$ 10.5	$ 9.2
Credit loss expense	24.9	27.2
Write-offs	(28.6)	(38.3)
Recoveries of prior write-offs	12.5	12.4
Ending balance December 31	19.3	10.5
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance January 1	3.8	3.9
Credit loss expense	11.1	7.2
Write-offs	(10.0)	(10.7)
Recoveries of prior write-offs	2.6	3.4
Ending balance December 31	7.5	3.8
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance January 1	4.6	3.8
Credit loss expense	9.0	13.7
Write-offs	(12.4)	(19.2)
Recoveries of prior write-offs	6.9	6.3
Ending balance December 31	$ 8.1	$ 4.6

RECEIVABLES - Other Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	$ 57.5	$ 42.0
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	49.9	37.7
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other receivables, contracts with customers	$ 6.9	$ 1.2

RECEIVABLES - Pledged as Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 360.0	$ 339.0
Evergy Kansas Central
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	180.0	171.0
Evergy Metro
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable pledged as collateral	$ 130.0	$ 118.0

RATE MATTERS AND REGULATION - Narrative (Details) $ in Millions	1 Months Ended		12 Months Ended
	May 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 2,664.9	$ 2,311.6
Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			806.3
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking			250.1
Analog meter unrecovered investment
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			$ 15.8
Regulatory Asset, Amortization Period			5 years
Deferred Customer Programs [Member]
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			$ 10.6
Kansas property tax surcharge
Regulatory Proceedings [Line Items]
Regulatory Asset, Amortization Period			1 year
Fuel recovery mechanisms
Regulatory Proceedings [Line Items]
Regulatory Asset, Amortization Period			1 year
Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 1,472.9	1,174.8
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			412.9
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking			(27.5)
Evergy Kansas Central \| Analog meter unrecovered investment
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			$ 15.8
Regulatory Asset, Amortization Period			5 years
Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 907.4	803.6
Evergy Metro \| Pension and post-retirement costs
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			333.6
Regulatory asset representing differences between pension and post retirement costs for GAAP and for ratemaking			137.6
Evergy Metro \| Deferred Customer Programs [Member]
Regulatory Proceedings [Line Items]
Remaining Amounts of Regulatory Assets for which No Return on Investment During Recovery Period is Provided			8.6
Revenues Probable Of Refund
Regulatory Proceedings [Line Items]
Regulatory liabilities			18.4	10.2
Revenues Probable Of Refund \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities			0.0	0.0
Revenues Probable Of Refund \| Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities			0.0	0.0
Purchase power agreement
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 6.3	7.4
Regulatory Liability, Amortization Period			5 years
Purchase power agreement \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 6.3	7.4
Purchase power agreement \| Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities			0.0	0.0
Fuel recovery mechanisms
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 1.3	34.1
Regulatory Liability, Amortization Period			1 year
Fuel recovery mechanisms \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 0.0	30.2
Fuel recovery mechanisms \| Evergy Metro
Regulatory Proceedings [Line Items]
Regulatory liabilities			$ 0.0	$ 0.0
La Cygne Station \| Evergy Kansas South Inc
Regulatory Proceedings [Line Items]
VIE ownership percentage			50.00%
Transmission delivery charge \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue increase (decrease) approved		$ 3.5
Transmission delivery charge \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue increase (decrease) approved	$ (2.7)
2018 Rate Case Proceedings \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity			0.50
Approved return on equity, percentage			9.30%
2018 Rate Case Proceedings \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity			0.50
Approved return on equity, percentage			9.30%
2018 MPSC OPC MECG Petition
Regulatory Proceedings [Line Items]
Annual estimated loss contingency portion not accrued (up to)			$ 12.0
2018 MPSC OPC MECG Petition \| Revenues Probable Of Refund
Regulatory Proceedings [Line Items]
Regulatory liabilities			18.4
FERC 2021 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			32.4
FERC 2021 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			(3.9)
FERC 2020 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			6.8
FERC 2020 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			(1.7)
FERC 2019 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			(11.2)
FERC 2019 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year			$ (2.8)

RATE MATTERS AND REGULATION - Regulatory Matters Asset (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Assets [Line Items]
Regulatory Assets	$ 2,074.4	$ 1,972.2
Less: current portion	(206.2)	(231.7)
Total noncurrent regulatory assets	1,868.2	1,740.5
Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	867.8	795.9
Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	98.9	105.8
Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	104.0	112.0
Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	116.2	114.3
Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	70.0	55.3
Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	183.4	129.3
Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	170.8	167.1
Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	24.1	29.9
Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	21.5	22.6
Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	6.9	7.1
Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	25.4	26.1
Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	28.9	21.7
Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.5	14.8
La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	12.4	13.7
Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	16.3	18.0
Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	26.2	34.7
Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	25.9	39.8
Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	10.0	31.0
Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	49.8	31.8
Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	128.4	130.5
Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	37.6	42.3
Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	35.4	28.5
Evergy Kansas Central
Regulatory Assets [Line Items]
Regulatory Assets	896.3	823.7
Less: current portion	(96.2)	(93.3)
Total noncurrent regulatory assets	800.1	730.4
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	412.9	359.9
Evergy Kansas Central \| Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	91.3	97.3
Evergy Kansas Central \| Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	52.7	55.3
Evergy Kansas Central \| Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	125.7	94.4
Evergy Kansas Central \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	55.0	52.8
Evergy Kansas Central \| Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	24.1	29.9
Evergy Kansas Central \| Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	21.5	22.6
Evergy Kansas Central \| Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	23.7	18.7
Evergy Kansas Central \| Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	14.5	14.8
Evergy Kansas Central \| La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	10.1	11.2
Evergy Kansas Central \| Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	5.7	6.2
Evergy Kansas Central \| Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	1.2	0.0
Evergy Kansas Central \| Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	5.0	15.5
Evergy Kansas Central \| Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	12.8	7.4
Evergy Kansas Central \| Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Kansas Central \| Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	18.0	20.3
Evergy Kansas Central \| Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	22.1	17.4
Evergy Metro
Regulatory Assets [Line Items]
Regulatory Assets	615.5	559.8
Less: current portion	(82.0)	(95.4)
Total noncurrent regulatory assets	533.5	464.4
Evergy Metro \| Pension and post-retirement costs
Regulatory Assets [Line Items]
Regulatory Assets	359.9	330.7
Evergy Metro \| Debt reacquisition costs
Regulatory Assets [Line Items]
Regulatory Assets	6.8	7.5
Evergy Metro \| Debt fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Asset retirement obligations fair value adjustment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Depreciation
Regulatory Assets [Line Items]
Regulatory Assets	9.4	0.0
Evergy Metro \| Cost of removal
Regulatory Assets [Line Items]
Regulatory Assets	57.7	34.9
Evergy Metro \| Asset retirement obligations
Regulatory Assets [Line Items]
Regulatory Assets	84.0	79.4
Evergy Metro \| Analog meter unrecovered investment
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Treasury yield hedges
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Iatan No. 1 and common facilities
Regulatory Assets [Line Items]
Regulatory Assets	2.8	2.8
Evergy Metro \| Iatan No. 2 construction accounting costs
Regulatory Assets [Line Items]
Regulatory Assets	12.7	13.1
Evergy Metro \| Kansas property tax surcharge
Regulatory Assets [Line Items]
Regulatory Assets	5.2	3.0
Evergy Metro \| Disallowed plant costs
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| La Cygne environmental costs
Regulatory Assets [Line Items]
Regulatory Assets	2.3	2.5
Evergy Metro \| Deferred customer programs
Regulatory Assets [Line Items]
Regulatory Assets	8.6	8.3
Evergy Metro \| Fuel recovery mechanisms
Regulatory Assets [Line Items]
Regulatory Assets	17.7	16.6
Evergy Metro \| Solar rebates
Regulatory Assets [Line Items]
Regulatory Assets	1.5	9.0
Evergy Metro \| Wolf Creek outage
Regulatory Assets [Line Items]
Regulatory Assets	5.0	15.5
Evergy Metro \| Pension and other post-retirement benefit non-service costs
Regulatory Assets [Line Items]
Regulatory Assets	23.4	15.6
Evergy Metro \| Retired generation facilities
Regulatory Assets [Line Items]
Regulatory Assets	0.0	0.0
Evergy Metro \| Merger transition costs
Regulatory Assets [Line Items]
Regulatory Assets	13.9	15.6
Evergy Metro \| Other regulatory liabilities
Regulatory Assets [Line Items]
Regulatory Assets	$ 4.6	$ 5.3

RATE MATTERS AND REGULATION - Regulatory Matters Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 2,664.9	$ 2,311.6
Less: current portion	(26.1)	(63.3)
Total noncurrent regulatory liabilities	2,638.8	2,248.3
Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	2,055.7	1,656.5
Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	48.1	53.6
Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	46.1	50.1
Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	319.7	267.3
Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	50.8	59.3
Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	28.7	28.7
La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	4.4	49.1
Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	17.0
Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	6.3	7.4
Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	1.3	34.1
Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	18.4	10.2
Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	55.8	48.7
Evergy Kansas Central
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,472.9	1,174.8
Less: current portion	(11.9)	(42.3)
Total noncurrent regulatory liabilities	1,461.0	1,132.5
Evergy Kansas Central \| Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	1,184.5	856.4
Evergy Kansas Central \| Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	48.1	53.6
Evergy Kansas Central \| Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	138.2	116.5
Evergy Kansas Central \| Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	31.4	31.5
Evergy Kansas Central \| Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	27.0	28.7
Evergy Kansas Central \| La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	29.6	29.6
Evergy Kansas Central \| Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	17.0
Evergy Kansas Central \| Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	6.3	7.4
Evergy Kansas Central \| Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	30.2
Evergy Kansas Central \| Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Kansas Central \| Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	7.8	3.9
Evergy Metro
Regulatory Liabilities [Line Items]
Regulatory liabilities	907.4	803.6
Less: current portion	(8.0)	(11.4)
Total noncurrent regulatory liabilities	899.4	792.2
Evergy Metro \| Taxes refundable through future rates
Regulatory Liabilities [Line Items]
Regulatory liabilities	650.2	568.9
Evergy Metro \| Deferred regulatory gain from sale leaseback
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Emission allowances
Regulatory Liabilities [Line Items]
Regulatory liabilities	46.1	50.1
Evergy Metro \| Nuclear decommissioning
Regulatory Liabilities [Line Items]
Regulatory liabilities	181.5	150.8
Evergy Metro \| Pension and post-retirement costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	13.1	20.3
Evergy Metro \| Jurisdictional allowance for funds used during construction
Regulatory Liabilities [Line Items]
Regulatory liabilities	1.7	0.0
Evergy Metro \| La Cygne leasehold dismantling costs
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Cost of removal
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Kansas tax credits
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Purchase power agreement
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Fuel recovery mechanisms
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Sibley AAO
Regulatory Liabilities [Line Items]
Regulatory liabilities	0.0	0.0
Evergy Metro \| Other regulatory liabilities
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 14.8	$ 13.5

GOODWILL (Details) $ in Millions	12 Months Ended
GOODWILL (Details) $ in Millions	Dec. 31, 2020 USD ($) reporting_unit	Dec. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill \| $	$ 2,336.6	$ 2,336.6
Number of reporting units \| reporting_unit	1

ASSET RETIREMENT OBLIGATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	$ 674.1	$ 687.1
Revision in timing and/or estimates	249.3	(22.3)
Settlements	(18.4)	(17.8)
Accretion	36.9	27.1
Ending balance	941.9	674.1
Less: current portion	(40.2)	(71.3)
Asset retirement obligations	901.7	602.8
Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	272.9	281.1
Revision in timing and/or estimates	136.8	(12.4)
Settlements	(2.2)	(14.8)
Accretion	19.7	19.0
Ending balance	427.2	272.9
Less: current portion	(11.2)	(23.3)
Asset retirement obligations	416.0	249.6
Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance January 1	253.6	261.0
Revision in timing and/or estimates	118.4	(9.9)
Settlements	(7.5)	(2.5)
Accretion	14.4	5.0
Ending balance	378.9	253.6
Less: current portion	(21.2)	(36.1)
Asset retirement obligations	$ 357.7	$ 217.5
Wolf Creek Unit
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			94.00%	94.00%
Wolf Creek Unit \| Evergy Kansas Central
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share				47.00%
Wolf Creek Unit \| Evergy Metro
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Jointly owned utility plant, proportionate ownership share			47.00%	47.00%

ASSET RETIREMENT OBLIGATIONS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Increase to ARO to decommission Wolf Creek resulting from study	$ 259.1
Evergy Kansas Central
Jointly Owned Utility Plant Interests [Line Items]
Increase to ARO to decommission Wolf Creek resulting from study	140.7
Evergy Metro
Jointly Owned Utility Plant Interests [Line Items]
Increase to ARO to decommission Wolf Creek resulting from study	$ 118.4

PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Electric plant in service	$ 28,914.8	$ 27,768.8
Electric plant acquisition adjustment	724.3	740.6
Accumulated depreciation	(10,998.4)	(10,293.7)
Plant in service	18,640.7	18,215.7
Construction work in progress	1,153.5	839.2
Nuclear fuel, net	155.9	128.5
Plant to be retired, net	0.9	1.0
Property, plant and equipment, net	19,951.0	19,184.4
Variable Interest Entities
Property, Plant and Equipment [Line Items]
Electric plant in service	392.1	392.1
Accumulated depreciation	(237.2)	(230.1)
Property, plant and equipment, net	154.9	162.0
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Electric plant in service	14,095.1	13,538.1
Electric plant acquisition adjustment	724.3	740.6
Accumulated depreciation	(5,293.5)	(4,951.5)
Plant in service	9,525.9	9,327.2
Construction work in progress	589.1	472.8
Nuclear fuel, net	77.7	63.9
Plant to be retired, net	0.9	1.0
Property, plant and equipment, net	10,193.6	9,864.9
Evergy Kansas Central \| Variable Interest Entities
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	154.9	162.0
Evergy Metro
Property, Plant and Equipment [Line Items]
Electric plant in service	11,161.8	10,776.5
Electric plant acquisition adjustment	0.0	0.0
Accumulated depreciation	(4,532.7)	(4,272.0)
Plant in service	6,629.1	6,504.5
Construction work in progress	433.9	269.9
Nuclear fuel, net	78.2	64.6
Plant to be retired, net	0.0	0.0
Property, plant and equipment, net	$ 7,141.2	$ 6,839.0

PROPERTY, PLANT AND EQUIPMENT - Depreciation Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 804.7	$ 786.3	$ 567.9
Variable Interest Entities
Property, Plant and Equipment [Line Items]
Depreciation expense	7.1	7.1	7.1
Evergy Kansas Central
Property, Plant and Equipment [Line Items]
Depreciation expense	435.1	425.8	371.3
Evergy Metro
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 269.5	$ 262.7	$ 235.3

JOINTLY-OWNED ELECTRIC UTILITY PLANTS (Details) $ in Millions	Dec. 31, 2020 USD ($)	Dec. 31, 2020	Dec. 31, 2020 MW	Dec. 31, 2020 Rate	Dec. 31, 2019 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	$ 155.9				$ 128.5
Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share		94.00%		94.00%
Electric plant in service	4,059.1
Accumulated depreciation	1,970.3
Nuclear fuel, net	155.9
Construction work in progress	183.5
Accredited capacity \| MW			1,108
La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				100.00%
Electric plant in service	2,207.6
Accumulated depreciation	779.4
Nuclear fuel, net	0.0
Construction work in progress	27.7
Accredited capacity \| MW			1,426
Iatan No. 1 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				88.00%
Electric plant in service	773.3
Accumulated depreciation	265.7
Nuclear fuel, net	0.0
Construction work in progress	10.3
Accredited capacity \| MW			618
Iatan No. 2 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				73.00%
Electric plant in service	1,404.3
Accumulated depreciation	459.3
Nuclear fuel, net	0.0
Construction work in progress	10.7
Accredited capacity \| MW			640
Iatan Common
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				79.00%
Electric plant in service	499.7
Accumulated depreciation	127.8
Nuclear fuel, net	0.0
Construction work in progress	4.4
Jeffrey Energy Center
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				100.00%
Electric plant in service	2,435.4
Accumulated depreciation	984.1
Nuclear fuel, net	0.0
Construction work in progress	84.1
Accredited capacity \| MW			2,012
State Line
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				40.00%
Electric plant in service	115.0
Accumulated depreciation	80.6
Nuclear fuel, net	0.0
Construction work in progress	12.9
Accredited capacity \| MW			200
Evergy Kansas Central
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	77.7				63.9
Evergy Kansas Central \| Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				47.00%
Electric plant in service	1,995.2
Accumulated depreciation	956.6
Nuclear fuel, net	77.7
Construction work in progress	77.2
Accredited capacity \| MW			554
Evergy Kansas Central \| La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				50.00%
Electric plant in service	1,046.5
Accumulated depreciation	446.2
Nuclear fuel, net	0.0
Construction work in progress	10.6
Accredited capacity \| MW			713
Evergy Kansas Central \| Jeffrey Energy Center
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				92.00%
Electric plant in service	2,229.5
Accumulated depreciation	895.3
Nuclear fuel, net	0.0
Construction work in progress	77.3
Accredited capacity \| MW			1,837
Evergy Kansas Central \| State Line
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				40.00%
Electric plant in service	115.0
Accumulated depreciation	80.6
Nuclear fuel, net	0.0
Construction work in progress	12.9
Accredited capacity \| MW			200
Evergy Metro
Jointly Owned Utility Plant Interests [Line Items]
Nuclear fuel, net	78.2				$ 64.6
Evergy Metro \| Wolf Creek Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share		47.00%		47.00%
Electric plant in service	2,063.9
Accumulated depreciation	1,013.7
Nuclear fuel, net	78.2
Construction work in progress	106.3
Accredited capacity \| MW			554
Evergy Metro \| La Cygne Units
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				50.00%
Electric plant in service	1,161.1
Accumulated depreciation	333.2
Nuclear fuel, net	0.0
Construction work in progress	17.1
Accredited capacity \| MW			713
Evergy Metro \| Iatan No. 1 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				70.00%
Electric plant in service	600.2
Accumulated depreciation	204.7
Nuclear fuel, net	0.0
Construction work in progress	8.3
Accredited capacity \| MW			492
Evergy Metro \| Iatan No. 2 Unit
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				55.00%
Electric plant in service	1,065.3
Accumulated depreciation	397.4
Nuclear fuel, net	0.0
Construction work in progress	8.0
Accredited capacity \| MW			482
Evergy Metro \| Iatan Common
Jointly Owned Utility Plant Interests [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				61.00%
Electric plant in service	396.5
Accumulated depreciation	110.5
Nuclear fuel, net	0.0
Construction work in progress	$ 3.1
Subsidiaries \| La Cygne Unit 2
Jointly Owned Utility Plant Interests [Line Items]
Leasehold interest percentage		50.00%
Subsidiaries \| Evergy Kansas Central \| La Cygne Unit 2
Jointly Owned Utility Plant Interests [Line Items]
Leasehold interest percentage		50.00%

PENSION PLANS AND POST-RETIREMENT BENEFITS - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020	Dec. 31, 2020 Rate
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ 11.2	$ 15.6
Non-qualified benefit obligations	52.1	49.4
Funded by trusts containing assets	46.3	$ 45.5
Contributions to plans in next year	$ 131.6
Defined benefit plan basis point change in discount rate	70	70
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ 0.0	$ 0.0
Contributions to plans in next year	4.1
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	0.0	0.0
Non-qualified benefit obligations	27.0	26.0
Funded by trusts containing assets	32.7	$ 31.7
Contributions to plans in next year	$ 41.2
Defined benefit plan basis point change in discount rate	70	70
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ 0.0	$ 0.0
Contributions to plans in next year	0.6
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	14.3	$ 23.0
Contributions to plans in next year	$ 90.4
Defined benefit plan basis point change in discount rate	70	70
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Settlement and special termination benefits	$ 0.0	$ 0.0
Contributions to plans in next year	$ 3.5
Wolf Creek
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			94.00%	94.00%
Wolf Creek \| Evergy Kansas South Inc
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			47.00%
Wolf Creek \| Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share \| Rate				47.00%
Wolf Creek \| Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Jointly owned utility plant, proportionate ownership share			47.00%	47.00%

PENSION PLANS AND POST-RETIREMENT BENEFITS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	$ 2,718.2	$ 2,553.4
Service cost	78.9	79.1	$ 60.7
Interest cost	96.8	108.0	82.5
Contribution by participants	0.0	0.0
Plan amendments	4.2
Actuarial gain (loss)	273.9	262.4
Benefits paid	(202.5)	(180.5)
Settlements	(62.9)	96.6
Other	(5.5)	(7.6)
Defined benefit plan, benefit obligation, end of the year	2,901.1	2,718.2	2,553.4
Change in plan assets
Fair value of plan assets, beginning of the year	1,732.8	1,603.4
Actual return on plan assets	209.9	284.0
Contributions by employer and participants	123.4	125.2
Benefits paid	(198.6)	(175.6)
Settlements	(62.9)	(96.6)
Other	(5.5)	(7.6)
Fair value of plan assets, end of the year	1,799.1	1,732.8	1,603.4
Funded status at end of year	(1,102.0)	(985.4)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(4.4)	(5.6)
Noncurrent pension liability and other post-retirement liability	(1,097.6)	(979.8)
Net amount recognized before regulatory treatment	(1,102.0)	(985.4)
Accumulated OCI or regulatory asset/liability	566.9	454.1
Net amount recognized at December 31, 2020	(535.1)	(531.3)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	566.9	454.1
Pension Benefits \| Evergy Kansas Central
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	1,323.4	1,258.9
Service cost	27.1	29.0	32.2
Interest cost	47.0	53.7	50.7
Contribution by participants	0.0	0.0
Plan amendments	8.1
Actuarial gain (loss)	127.0	120.3
Benefits paid	(102.3)	(136.9)
Settlements	0.0	0.0
Other	(0.7)	(1.6)
Defined benefit plan, benefit obligation, end of the year	1,429.6	1,323.4	1,258.9
Change in plan assets
Fair value of plan assets, beginning of the year	842.1	804.6
Actual return on plan assets	99.7	130.5
Contributions by employer and participants	45.8	43.0
Benefits paid	(99.9)	(134.4)
Settlements	0.0	0.0
Other	(0.7)	(1.6)
Fair value of plan assets, end of the year	887.0	842.1	804.6
Funded status at end of year	(542.6)	(481.3)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(2.5)	(3.0)
Noncurrent pension liability and other post-retirement liability	(540.1)	(478.3)
Net amount recognized before regulatory treatment	(542.6)	(481.3)
Accumulated OCI or regulatory asset/liability	408.0	354.9
Net amount recognized at December 31, 2020	(134.6)	(126.4)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	408.0	354.9
Pension Benefits \| Evergy Metro
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	1,371.4	1,272.4
Service cost	51.8	50.1	48.6
Interest cost	49.1	53.3	49.9
Contribution by participants	0.0	0.0
Plan amendments	(3.9)
Actuarial gain (loss)	144.8	140.5
Benefits paid	(99.0)	(42.3)
Settlements	(62.9)	96.6
Other	(4.8)	(6.0)
Defined benefit plan, benefit obligation, end of the year	1,446.5	1,371.4	1,272.4
Change in plan assets
Fair value of plan assets, beginning of the year	890.7	798.8
Actual return on plan assets	110.2	153.5
Contributions by employer and participants	77.6	82.2
Benefits paid	(98.7)	(41.2)
Settlements	(62.9)	(96.6)
Other	(4.8)	(6.0)
Fair value of plan assets, end of the year	912.1	890.7	798.8
Funded status at end of year	(534.4)	(480.7)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(0.8)	(1.3)
Noncurrent pension liability and other post-retirement liability	(533.6)	(479.4)
Net amount recognized before regulatory treatment	(534.4)	(480.7)
Accumulated OCI or regulatory asset/liability	216.9	192.3
Net amount recognized at December 31, 2020	(317.5)	(288.4)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	216.9	192.3
Post-Retirement Benefits
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	264.3	249.3
Service cost	2.7	2.5	2.3
Interest cost	9.2	10.5	8.0
Contribution by participants	9.3	8.8
Plan amendments	1.0
Actuarial gain (loss)	19.6	20.9
Benefits paid	(25.7)	(27.7)
Settlements	0.0	0.0
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	280.4	264.3	249.3
Change in plan assets
Fair value of plan assets, beginning of the year	239.9	223.3
Actual return on plan assets	20.7	30.0
Contributions by employer and participants	11.7	13.2
Benefits paid	(24.0)	(26.6)
Settlements	0.0	0.0
Other	0.0	0.0
Fair value of plan assets, end of the year	248.3	239.9	223.3
Funded status at end of year	(32.1)	(24.4)
Amounts recognized in the consolidated balance sheets
Non-current asset	21.3	15.0
Current pension and other post-retirement liability	(1.6)	(1.9)
Noncurrent pension liability and other post-retirement liability	(51.8)	(37.5)
Net amount recognized before regulatory treatment	(32.1)	(24.4)
Accumulated OCI or regulatory asset/liability	4.0	(4.4)
Net amount recognized at December 31, 2020	(28.1)	(28.8)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	4.0	(4.4)
Post-Retirement Benefits \| Evergy Kansas Central
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	138.7	133.6
Service cost	1.1	1.1	1.3
Interest cost	4.8	5.6	5.0
Contribution by participants	1.8	1.9
Plan amendments	0.5
Actuarial gain (loss)	11.0	9.5
Benefits paid	(11.1)	(13.0)
Settlements	0.0	0.0
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	146.8	138.7	133.6
Change in plan assets
Fair value of plan assets, beginning of the year	120.5	109.7
Actual return on plan assets	13.7	20.0
Contributions by employer and participants	2.1	3.5
Benefits paid	(10.5)	(12.7)
Settlements	0.0	0.0
Other	0.0	0.0
Fair value of plan assets, end of the year	125.8	120.5	109.7
Funded status at end of year	(21.0)	(18.2)
Amounts recognized in the consolidated balance sheets
Non-current asset	0.0	0.0
Current pension and other post-retirement liability	(0.8)	(1.0)
Noncurrent pension liability and other post-retirement liability	(20.2)	(17.2)
Net amount recognized before regulatory treatment	(21.0)	(18.2)
Accumulated OCI or regulatory asset/liability	1.0	(2.9)
Net amount recognized at December 31, 2020	(20.0)	(21.1)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	1.0	(2.9)
Post-Retirement Benefits \| Evergy Metro
Components of net periodic benefit costs
Defined benefit plan, benefit obligation, beginning of the year	125.6	115.7
Service cost	1.6	1.4	2.0
Interest cost	4.4	4.9	4.8
Contribution by participants	7.5	6.9
Plan amendments	0.5
Actuarial gain (loss)	8.6	11.4
Benefits paid	(14.6)	(14.7)
Settlements	0.0	0.0
Other	0.0	0.0
Defined benefit plan, benefit obligation, end of the year	133.6	125.6	115.7
Change in plan assets
Fair value of plan assets, beginning of the year	119.4	113.6
Actual return on plan assets	7.0	10.0
Contributions by employer and participants	9.6	9.7
Benefits paid	(13.5)	(13.9)
Settlements	0.0	0.0
Other	0.0	0.0
Fair value of plan assets, end of the year	122.5	119.4	$ 113.6
Funded status at end of year	(11.1)	(6.2)
Amounts recognized in the consolidated balance sheets
Non-current asset	21.3	15.0
Current pension and other post-retirement liability	(0.9)	(0.9)
Noncurrent pension liability and other post-retirement liability	(31.5)	(20.3)
Net amount recognized before regulatory treatment	(11.1)	(6.2)
Accumulated OCI or regulatory asset/liability	(7.7)	(13.0)
Net amount recognized at December 31, 2020	(18.8)	(19.2)
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Accumulated OCI or regulatory asset/liability	(7.7)	(13.0)
Actuarial (gain) loss \| Pension Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	551.8	439.7
Actuarial (gain) loss \| Pension Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	388.9	342.3
Actuarial (gain) loss \| Pension Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	218.6	189.4
Actuarial (gain) loss \| Post-Retirement Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	2.2	(5.7)
Actuarial (gain) loss \| Post-Retirement Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	(0.3)	(4.2)
Actuarial (gain) loss \| Post-Retirement Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Actuarial (gain) loss	0.0	(4.9)
Prior service cost \| Pension Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	15.1	14.4
Prior service cost \| Pension Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	19.1	12.6
Prior service cost \| Pension Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	(1.7)	2.9
Prior service cost \| Post-Retirement Benefits
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	1.8	1.3
Prior service cost \| Post-Retirement Benefits \| Evergy Kansas Central
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	1.3	1.3
Prior service cost \| Post-Retirement Benefits \| Evergy Metro
Amounts in accumulated OCI or regulatory asset/liability not yet recognized as a component of net periodic benefit cost:
Prior service cost	$ (7.7)	$ (8.1)

PENSION PLANS AND POST-RETIREMENT BENEFITS PENSION PLANS AND POST-RETIREMENT BENEFITS - Schedule of Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	$ (0.6)	$ 47.0	$ 3.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	78.9	79.1	60.7
Interest cost	96.8	108.0	82.5
Expected return on plan assets	(105.6)	(106.3)	(86.4)
Prior service cost	1.8	1.9	0.7
Recognized net actuarial (gain) loss	46.4	33.0	32.6
Settlement and special termination benefits	11.2	15.6
Net periodic benefit costs before regulatory adjustment and intercompany allocations	129.5	131.3	90.1
Regulatory adjustment	29.6	37.4	8.3
Net periodic benefit costs (income)	159.1	168.7	98.4
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	112.8	34.2	47.3
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	271.9	202.9	145.7
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.7	2.5	2.3
Interest cost	9.2	10.5	8.0
Expected return on plan assets	(9.3)	(10.0)	(8.8)
Prior service cost	0.5	0.5	0.5
Recognized net actuarial (gain) loss	0.2	(1.2)	(0.6)
Settlement and special termination benefits	0.0	0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	3.3	2.3	1.4
Regulatory adjustment	(4.0)	(3.4)	(1.7)
Net periodic benefit costs (income)	(0.7)	(1.1)	(0.3)
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	8.4	1.6	5.0
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	7.7	0.5	4.7
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	27.1	29.0	32.2
Interest cost	47.0	53.7	50.7
Expected return on plan assets	(53.1)	(54.8)	(55.9)
Prior service cost	1.6	1.7	0.7
Recognized net actuarial (gain) loss	33.9	25.5	32.6
Settlement and special termination benefits	0.0	0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	56.5	55.1	60.3
Regulatory adjustment	5.9	3.0	8.8
Intercompany allocations	(0.2)	0.0	0.0
Net periodic benefit costs (income)	62.2	58.1	69.1
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	53.1	17.4	(35.1)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	115.3	75.5	34.0
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.1	1.1	1.3
Interest cost	4.8	5.6	5.0
Expected return on plan assets	(6.6)	(6.7)	(7.0)
Prior service cost	0.5	0.5	0.5
Recognized net actuarial (gain) loss	0.0	(0.6)	(0.6)
Settlement and special termination benefits	0.0	0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	(0.2)	(0.1)	(0.8)
Regulatory adjustment	(3.0)	(3.0)	(2.0)
Intercompany allocations	0.1	0.0	0.0
Net periodic benefit costs (income)	(3.1)	(3.1)	(2.8)
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	3.9	(3.7)	11.8
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	0.8	(6.8)	9.0
Evergy Metro
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	0.2	(0.7)	(3.7)
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	51.8	50.1	48.6
Interest cost	49.1	53.3	49.9
Expected return on plan assets	(54.7)	(48.9)	(55.5)
Prior service cost	0.8	0.9	0.7
Recognized net actuarial (gain) loss	45.7	49.8	45.1
Settlement and special termination benefits	14.3	23.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	107.0	128.2	88.8
Regulatory adjustment	(11.6)	(19.2)	0.7
Intercompany allocations	(22.6)	(34.4)	(21.6)
Net periodic benefit costs (income)	72.8	74.6	67.9
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	24.6	(37.8)	(17.9)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	97.4	36.8	50.0
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	1.6	1.4	2.0
Interest cost	4.4	4.9	4.8
Expected return on plan assets	(2.7)	(3.3)	(2.8)
Prior service cost	0.0	0.0	0.1
Recognized net actuarial (gain) loss	(0.6)	(1.4)	(0.2)
Settlement and special termination benefits	0.0	0.0
Net periodic benefit costs before regulatory adjustment and intercompany allocations	2.7	1.6	3.9
Regulatory adjustment	(0.2)	0.4	(0.1)
Intercompany allocations	(0.3)	(0.4)	(1.1)
Net periodic benefit costs (income)	2.2	1.6	2.7
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Total recognized in OCI or regulatory asset/liability	5.3	6.1	(13.9)
Total recognized in net periodic benefit costs and OCI or regulatory asset/liability	7.5	7.7	(11.2)
Actuarial (gain) loss \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	169.7	84.7	67.2
Amounts reclassified from accumulated other comprehensive loss	(59.2)	(48.6)	(32.6)
Actuarial (gain) loss \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	8.2	0.9	4.9
Amounts reclassified from accumulated other comprehensive loss	(0.2)	1.2	0.6
Actuarial (gain) loss \| Evergy Kansas Central \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	80.4	44.6	(13.2)
Amounts reclassified from accumulated other comprehensive loss	(33.8)	(25.5)	(32.6)
Actuarial (gain) loss \| Evergy Kansas Central \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3.9	(3.8)	11.7
Amounts reclassified from accumulated other comprehensive loss	0.0	0.6	0.6
Actuarial (gain) loss \| Evergy Metro \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	89.3	35.9	25.9
Amounts reclassified from accumulated other comprehensive loss	(60.0)	(72.8)	(45.1)
Actuarial (gain) loss \| Evergy Metro \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4.3	4.7	(14.0)
Amounts reclassified from accumulated other comprehensive loss	0.6	1.4	0.2
Prior service cost \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(4.1)		13.4
Amounts reclassified from accumulated other comprehensive loss	(1.8)	(1.9)	(0.7)
Prior service cost \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(0.9)		0.0
Amounts reclassified from accumulated other comprehensive loss	(0.5)	(0.5)	(0.5)
Prior service cost \| Evergy Kansas Central \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(8.1)		11.4
Amounts reclassified from accumulated other comprehensive loss	(1.6)	(1.7)	(0.7)
Prior service cost \| Evergy Kansas Central \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(0.5)		0.0
Amounts reclassified from accumulated other comprehensive loss	(0.5)	(0.5)	(0.5)
Prior service cost \| Evergy Metro \| Pension Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3.9		2.0
Amounts reclassified from accumulated other comprehensive loss	(0.8)	(0.9)	(0.7)
Prior service cost \| Evergy Metro \| Post-Retirement Benefits
Other changes in plan assets and benefit obligations recognized in OCI or regulatory assets/liabilities
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(0.4)		0.0
Amounts reclassified from accumulated other comprehensive loss	$ 0.0	$ 0.0	$ (0.1)

PENSION PLANS AND POST-RETIREMENT BENEFITS - APBO (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	$ 2,534.1	$ 2,390.5
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	2,901.1	2,718.2
Fair value of plan assets	1,799.1	1,732.8
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	2,534.1	2,390.5
Fair value of plan assets	1,799.1	1,732.8
Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	280.4	264.3
Fair value of plan assets	248.3	239.9
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	1,227.4	1,170.2
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	1,446.5	1,371.4
Fair value of plan assets	912.1	890.7
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	1,227.4	1,170.2
Fair value of plan assets	912.1	890.7
Evergy Metro \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	133.6	125.6
Fair value of plan assets	122.5	119.4
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
ABO for all defined benefit pension plans	1,281.6	1,196.8
Pension plans with the PBO in excess of plan assets
Projected benefit obligation	1,429.6	1,323.4
Fair value of plan assets	887.0	842.1
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	1,281.6	1,196.8
Fair value of plan assets	887.0	842.1
Evergy Kansas Central \| Post-Retirement Benefits
Other post-retirement benefit plans with the APBO in excess of plan assets
Accumulated benefit obligation	146.8	138.7
Fair value of plan assets	$ 125.8	$ 120.5

PENSION PLANS AND POST-RETIREMENT BENEFITS - Weighted-Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.95%	3.62%
Rate of compensation increase	3.71%	3.74%
Interest crediting rate for cash balance plans	4.12%	4.32%
Weighted-average assumptions used to determine net costs
Discount rate	3.62%	4.35%
Expected long-term return on plan assets	6.63%	6.61%
Rate of compensation increase	3.74%	3.76%
Interest crediting rate for cash balance plans	4.32%	4.32%
Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.84%	3.56%
Rate of compensation increase	3.75%	3.75%
Weighted-average assumptions used to determine net costs
Discount rate	3.56%	4.33%
Expected long-term return on plan assets	4.19%	4.44%
Rate of compensation increase	3.75%	3.50%
Evergy Kansas Central \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.93%	3.61%
Rate of compensation increase	3.76%	3.78%
Interest crediting rate for cash balance plans	4.00%	4.21%
Weighted-average assumptions used to determine net costs
Discount rate	3.61%	4.35%
Expected long-term return on plan assets	6.70%	6.75%
Rate of compensation increase	3.75%	4.03%
Interest crediting rate for cash balance plans	4.21%	4.21%
Evergy Kansas Central \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.80%	3.54%
Weighted-average assumptions used to determine net costs
Discount rate	3.54%	4.33%
Expected long-term return on plan assets	6.00%	6.00%
Evergy Metro \| Pension Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.97%	3.64%
Rate of compensation increase	3.71%	3.71%
Interest crediting rate for cash balance plans	4.46%	4.50%
Weighted-average assumptions used to determine net costs
Discount rate	3.64%	4.36%
Expected long-term return on plan assets	6.56%	6.47%
Rate of compensation increase	3.71%	3.64%
Interest crediting rate for cash balance plans	4.50%	4.50%
Evergy Metro \| Post-Retirement Benefits
Weighted-average assumptions used to determine the benefit obligation
Discount rate	2.88%	3.58%
Rate of compensation increase	3.75%	3.75%
Weighted-average assumptions used to determine net costs
Discount rate	3.58%	4.33%
Expected long-term return on plan assets	2.37%	2.94%
Rate of compensation increase	3.75%	3.50%

PENSION PLANS AND POST-RETIREMENT BENEFITS - Expected Future Services (Details) $ in Millions	Dec. 31, 2020 USD ($)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	$ 187.6
2022	189.6
2023	192.6
2024	193.2
2025	195.5
2026-2030	957.0
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	16.7
2022	16.4
2023	16.1
2024	15.7
2025	15.3
2026-2030	73.1
Evergy Kansas Central \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	96.2
2022	95.5
2023	95.7
2024	95.2
2025	94.5
2026-2030	442.8
Evergy Kansas Central \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	9.5
2022	9.3
2023	9.1
2024	8.8
2025	8.6
2026-2030	39.8
Evergy Metro \| Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	90.2
2022	92.8
2023	95.6
2024	96.7
2025	99.4
2026-2030	506.5
Evergy Metro \| Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2021	7.2
2022	7.1
2023	6.9
2024	6.9
2025	6.8
2026-2030	$ 33.3

PENSION PLANS AND POST-RETIREMENT BENEFITS - Cost Trend Assumptions (Details) - Post-Retirement Benefits	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.00%	6.30%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year that rate reaches ultimate trend	2027	2027
Evergy Metro
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.00%	6.30%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year that rate reaches ultimate trend	2027	2027
Evergy Kansas Central
Assumed annual health care cost growth rates
Health care cost trend rate assumed for next year	6.00%	6.30%
Rate to which the cost trend is assumed to decline (the ultimate trend rate)	4.50%	4.50%
Year that rate reaches ultimate trend	2027	2027

PENSION PLANS AND POST-RETIREMENT BENEFITS - Employee Savings Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 17.4	$ 17.6	$ 16.3
Evergy Kansas Central
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	9.6	9.6	9.9
Evergy Metro
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost	$ 7.8	$ 8.0	$ 8.3

EQUITY COMPENSATION - Narrative (Details) $ in Millions		12 Months Ended
EQUITY COMPENSATION - Narrative (Details) $ in Millions	Jun. 04, 2018 USD ($)	Dec. 31, 2020	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 14.6
Expected volatility, maximum		17.00%
Expected dividend yield		2.93%
Risk-free interest rate, maximum		0.72%
Evergy Kansas Central
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense			$ 14.6
Great Plains Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exchange ratio	0.5981
Share-based Payment Arrangement \| Great Plains Energy
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares issued	$ 12.5

EQUITY COMPENSATION - Income Tax Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	$ 15.5	$ 15.5	$ 30.7
Income tax benefit	2.2	3.0	1.4
Evergy Kansas Central
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	7.6	6.7	24.8
Income tax benefit	1.6	1.9	1.4
Evergy Metro
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity compensation expense	5.7	5.7	6.5
Income tax benefit	$ 0.2	$ 0.3	$ 0.1

EQUITY COMPENSATION - RSUs (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
RSU With Performance Measures
Nonvested Restricted Share Units
Beginning balance (in shares)	197,250
Granted (in shares)	175,991
Forfeited (in shares)	(25,277)
Ending balance (in shares)	347,964	197,250
Grant Date Fair Value*
Weighted average beginning balance (in dollars per share)	$ 37.87
Weighted average granted (in dollars per share)	87.98	$ 37.87
Weighted average, forfeited (in dollars per share)	60.55
Weighted average ending balance (in dollars per share)	$ 61.57	$ 37.87
Remaining weighted-average contractual term (in years)	1 year 8 months 12 days
Total unrecognized compensation expense,	$ 17.5
Vested (in shares)	0	0
RSUs
Nonvested Restricted Share Units
Beginning balance (in shares)	233,350
Granted (in shares)	59,539
Forfeited (in shares)	(11,611)
Ending balance (in shares)	160,742	233,350
Grant Date Fair Value*
Weighted average beginning balance (in dollars per share)	$ 54.16
Weighted average granted (in dollars per share)	68.92	$ 54.47	$ 52.16
Weighted average, vested (in dollars per share)	53.94
Weighted average, forfeited (in dollars per share)	59.27
Weighted average ending balance (in dollars per share)	$ 59.42	$ 54.16
Remaining weighted-average contractual term (in years)	1 year 3 months 18 days
Total unrecognized compensation expense,	$ 3.5
Vested (in shares)	120,536
Total fair value of shares	$ 6.5	$ 2.6	$ 16.0

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Narrative (Details) - Cash Borrowings	Dec. 31, 2020 USD ($)
Short-term Debt [Line Items]
Line of credit, maximum borrowing capacity	$ 2,500,000,000
Debt instrument, debt default, threshold	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Evergy Kansas Central
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Evergy Metro
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%
Evergy Missouri West
Short-term Debt [Line Items]
Debt instrument, debt default, threshold	$ 100,000,000.0
Debt Instrument, debt to capitalization ratio (no more than)	65.00%

SHORT-TERM BORROWINGS AND SHORT-TERM BANK LINES OF CREDIT - Schedule of Short Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Master Credit Facility	$ 2,500.0	$ 2,500.0
Available Borrowings	2,165.3	1,921.1
Evergy, Inc.
Short-term Debt [Line Items]
Master Credit Facility	450.0	450.0
Available Borrowings	$ 249.3	$ 429.3
Weighted Average Interest Rate on Short-Term Borrowings	1.40%	2.99%
Evergy Kansas Central
Short-term Debt [Line Items]
Master Credit Facility	$ 1,000.0	$ 1,000.0
Available Borrowings	$ 933.0	$ 736.6
Weighted Average Interest Rate on Short-Term Borrowings	0.23%	2.07%
Evergy Metro
Short-term Debt [Line Items]
Master Credit Facility	$ 600.0	$ 600.0
Available Borrowings	$ 600.0	$ 400.7
Weighted Average Interest Rate on Short-Term Borrowings	0.00%	2.02%
Evergy Missouri West
Short-term Debt [Line Items]
Master Credit Facility	$ 450.0	$ 450.0
Available Borrowings	$ 383.0	$ 354.5
Weighted Average Interest Rate on Short-Term Borrowings	0.36%	2.02%
Commercial Paper
Short-term Debt [Line Items]
Long-term line of credit	$ 115.0	$ 541.9
Commercial Paper \| Evergy Kansas Central
Short-term Debt [Line Items]
Long-term line of credit	50.0	249.2
Commercial Paper \| Evergy Metro
Short-term Debt [Line Items]
Long-term line of credit	0.0	199.3
Commercial Paper \| Evergy Missouri West
Short-term Debt [Line Items]
Long-term line of credit	65.0	93.4
Letters of Credit
Short-term Debt [Line Items]
Letters of Credit	19.7	17.0
Letters of Credit \| Evergy, Inc.
Short-term Debt [Line Items]
Letters of Credit	0.7	0.7
Letters of Credit \| Evergy Kansas Central
Short-term Debt [Line Items]
Letters of Credit	17.0	14.2
Letters of Credit \| Evergy Metro
Short-term Debt [Line Items]
Letters of Credit	0.0	0.0
Letters of Credit \| Evergy Missouri West
Short-term Debt [Line Items]
Letters of Credit	2.0	2.1
Cash Borrowings
Short-term Debt [Line Items]
Long-term line of credit	200.0	20.0
Cash Borrowings \| Evergy, Inc.
Short-term Debt [Line Items]
Long-term line of credit	200.0	20.0
Cash Borrowings \| Evergy Kansas Central
Short-term Debt [Line Items]
Long-term line of credit	0.0	0.0
Cash Borrowings \| Evergy Metro
Short-term Debt [Line Items]
Long-term line of credit	0.0	0.0
Cash Borrowings \| Evergy Missouri West
Short-term Debt [Line Items]
Long-term line of credit	$ 0.0	$ 0.0

LONG-TERM DEBT (Details) - USD ($) $ in Millions	Dec. 31, 2020	May 31, 2020	Apr. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	$ (436.4)			$ (251.1)
Unamortized debt discount and debt issuance costs	(84.9)			(80.7)
Total excluding current maturities	9,190.9			8,746.7
Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	110.4			125.5
Long-term Debt, Current Maturities	$ (4.4)			$ (4.3)
Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate				5.10%
Long-term debt gross				$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Interest rate	3.25%			3.25%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Interest rate	2.55%			2.55%
Long-term debt gross	$ 350.0			$ 350.0
Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Interest rate	3.10%			3.10%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Interest rate	4.125%			4.125%
Long-term debt gross	$ 550.0			$ 550.0
Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.10%			4.10%
Long-term debt gross	$ 430.0			$ 430.0
Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Interest rate	4.625%			4.625%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Interest rate	4.25%			4.25%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Interest rate	3.25%			3.25%
Long-term debt gross	$ 300.0			$ 300.0
Mortgage Bonds \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate	3.45%
Long-term debt gross	$ 500.0
Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Interest rate	6.15%			6.15%
Long-term debt gross	$ 50.0			$ 50.0
Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Interest rate	6.53%			6.53%
Long-term debt gross	$ 175.0			$ 175.0
Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Interest rate	6.64%			6.64%
Long-term debt gross	$ 100.0			$ 100.0
Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Interest rate	4.30%			4.30%
Long-term debt gross	$ 250.0			$ 250.0
Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Interest rate	2.95%			2.95%
Long-term debt gross	$ 79.5			$ 79.5
Mortgage Bonds \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate	2.25%
Long-term debt gross	$ 400.0
Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Interest rate	4.125%			4.125%
Long-term debt gross	$ 400.0			$ 400.0
Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Interest rate	9.44%			9.44%
Long-term debt gross	$ 1.1			$ 2.3
Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 45.0			$ 45.0
Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 30.5			$ 30.5
Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 21.9			$ 21.9
Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Interest rate	2.50%			2.50%
Long-term debt gross	$ 50.0			$ 50.0
Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Interest rate	0.18%			1.39%
Long-term debt gross	$ 14.5			$ 14.5
Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Interest rate	1.39%			1.39%
Long-term debt gross	$ 10.0			$ 10.0
Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Interest rate	1.432%			1.432%
Long-term debt gross	$ 146.5			$ 146.5
Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Interest rate	2.75%			2.75%
Long-term debt gross	$ 23.4			$ 23.4
Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Interest rate	3.15%			3.15%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Interest rate	3.65%			3.65%
Long-term debt gross	$ 350.0			$ 350.0
Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Interest rate	6.05%			6.05%
Long-term debt gross	$ 250.0			$ 250.0
Senior Notes \| Senior Notes Due 2035A EM
Debt Instrument [Line Items]
Interest rate	5.78%			5.78%
Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Interest rate	5.30%			5.30%
Long-term debt gross	$ 400.0			$ 400.0
Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Interest rate	4.20%			4.20%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Interest rate	4.20%			4.20%
Long-term debt gross	$ 300.0			$ 300.0
Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Interest rate	8.27%			8.27%
Long-term debt gross	$ 80.9			$ 80.9
Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Interest rate	3.49%			3.49%
Long-term debt gross	$ 36.0			$ 36.0
Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Interest rate	4.06%			4.06%
Long-term debt gross	$ 60.0			$ 60.0
Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Interest rate	4.74%			4.74%
Long-term debt gross	$ 150.0			$ 150.0
Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Interest rate	3.74%			3.74%
Long-term debt gross	$ 100.0			$ 100.0
Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Interest rate	4.85%			4.85%
Long-term debt gross	$ 350.0			$ 350.0
Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Interest rate	5.292%			5.292%
Long-term debt gross	$ 287.5			$ 287.5
Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Interest rate	2.45%			2.45%
Long-term debt gross	$ 800.0			$ 800.0
Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Interest rate	2.90%			2.90%
Long-term debt gross	$ 800.0			$ 800.0
Senior Notes \| Senior Notes Due 2029A
Debt Instrument [Line Items]
Interest rate	3.77%			3.77%
Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.33%			7.33%
Long-term debt gross	$ 3.0			$ 3.0
Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Interest rate	7.17%			7.17%
Long-term debt gross	$ 7.0			$ 7.0
Evergy Kansas Central
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0.0			(250.0)
Unamortized debt discount and debt issuance costs	(45.4)			(40.8)
Total excluding current maturities	3,931.5			3,436.1
Evergy Kansas Central \| Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate			5.10%
Long-term debt gross			$ 250.0	250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	350.0			350.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	550.0			550.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	430.0			430.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate			3.45%
Long-term debt gross	500.0		$ 500.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0			50.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	175.0			175.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	100.0			100.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	45.0			45.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	30.5			30.5
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	21.9			21.9
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	50.0			50.0
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	14.5			14.5
Evergy Kansas Central \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	10.0			10.0
Evergy Kansas Central \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Kansas Central \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	0.0			0.0
Unamortized debt discount and debt issuance costs	(26.4)			(24.4)
Total excluding current maturities	2,923.0			2,525.0
Evergy Metro \| Fair Value adjustment
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Long-term debt gross				0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2025 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2026 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2027 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2042 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2043 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2045 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2049 EKC
Debt Instrument [Line Items]
Long-term debt gross
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2023 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2037 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2038 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2044 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	79.5			79.5
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate		2.25%
Long-term debt gross	400.0	$ 400.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due 2049 EM
Debt Instrument [Line Items]
Long-term debt gross	400.0			400.0
Evergy Metro \| Mortgage Bonds \| Mortgage Bonds Due Through 2021-2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Mortgage Bonds \| General Mortgage Bonds EIRR Series 2005
Debt Instrument [Line Items]
Long-term debt gross	50.0			21.9
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKC
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2027 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2031 EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2032A EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| Pollution Control Bonds Due 2032B EKS
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	146.5			146.5
Evergy Metro \| Pollution Control Bonds \| EIRR Bonds Series 2007A and 2007B due 2038 EM
Debt Instrument [Line Items]
Long-term debt gross	23.4			23.4
Evergy Metro \| Senior Notes \| Series Notes Due 2023 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2025 EM
Debt Instrument [Line Items]
Long-term debt gross	350.0			350.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2035 EM
Debt Instrument [Line Items]
Long-term debt gross	250.0			250.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2041 EM
Debt Instrument [Line Items]
Long-term debt gross	400.0			400.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2047 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2048 EM
Debt Instrument [Line Items]
Long-term debt gross	300.0			300.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2021 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2025 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2033 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2043 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Series Due 2022 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2021
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Senior Notes \| Senior Notes Due 2029
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Evergy Metro \| Medium Term Notes \| Medium Term Notes Due 2023 EMW
Debt Instrument [Line Items]
Long-term debt gross	0.0			0.0
Variable Interest Entities
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	0.0			18.8
Variable Interest Entities \| Unsecured Debt \| Unsecured Debt Due 2021 VIEs
Debt Instrument [Line Items]
Long-term debt gross	18.8			51.1
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	0.0			18.8
Variable Interest Entities \| Evergy Kansas Central
Debt Instrument [Line Items]
Long-term Debt, Current Maturities	(18.8)			(32.3)
Total excluding current maturities	$ 0.0			$ 18.8

LONG-TERM DEBT - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	May 31, 2020	Apr. 30, 2020	Dec. 31, 2019
Secured Debt \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate	3.45%
Long-term debt gross	$ 500.0
Secured Debt \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate				5.10%
Long-term debt gross				$ 250.0
Secured Debt \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate	2.25%
Long-term debt gross	$ 400.0
Evergy Kansas Central
Debt Instrument [Line Items]
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued	780.6
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Interest rate			3.45%
Long-term debt gross	500.0		$ 500.0
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Interest rate			5.10%
Long-term debt gross			$ 250.0	250.0
Evergy Kansas Central \| Secured Debt \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Long-term debt gross	0.0
Evergy Metro
Debt Instrument [Line Items]
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued	$ 4,733.1
Percentage of Bondable Property Allowed	75.00%
Evergy Metro \| Secured Debt \| Mortgage Bonds Due 2050 EKC
Debt Instrument [Line Items]
Long-term debt gross	$ 0.0
Evergy Metro \| Secured Debt \| Mortgage Bonds Due 2020 EKC
Debt Instrument [Line Items]
Long-term debt gross				$ 0.0
Evergy Metro \| Secured Debt \| Mortgage Bonds Due 2030 EM
Debt Instrument [Line Items]
Interest rate		2.25%
Long-term debt gross	400.0	$ 400.0
Evergy Kansas South Inc
Debt Instrument [Line Items]
Maximum Amount Of First Mortgage Bonds Authorized	3,500.0
AdditionalPrincipalFirstMortgageBondsAvailableToBeIssued	$ 2,828.6

LONG-TERM DEBT - Scheduled Maturities (Details) $ in Millions	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
2021	$ 432.0
2022	387.5
2023	439.5
2024	800.0
2025	636.0
Variable Interest Entities
Debt Instrument [Line Items]
2021	18.8
2022	0.0
2023	0.0
2024	0.0
2025	0.0
Evergy Kansas Central
Debt Instrument [Line Items]
2021	0.0
2022	0.0
2023	50.0
2024	0.0
2025	250.0
Evergy Metro
Debt Instrument [Line Items]
2021	0.0
2022	0.0
2023	379.5
2024	0.0
2025	$ 350.0

FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	10 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payment for settlement of interest rate swap accounted for as a cash flow hedge	$ 69.8		$ 0.0	$ 69.8	$ 0.0
Notional amount	500.0	$ 500.0
Other comprehensive loss		69.8	0.0	64.4	5.4
Interest expense			(383.9)	(374.0)	(279.6)
Income tax benefit			(102.2)	(97.0)	$ (59.0)
Accumulated other comprehensive loss over the next twelve months			5.4
Senior Notes Due 2029 Evergy \| Senior Notes
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Debt issued	$ 800.0	$ 800.0
Interest rate	2.90%	2.90%
Debt instrument, term		10 years
Reclassification out of Accumulated Other Comprehensive Income \| Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Interest expense			7.0	2.0
Income tax benefit			$ (4.0)	$ (0.5)

FAIR VALUE MEASUREMENTS - Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	$ 652.1	$ 573.2
Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	47.8	36.2
Fair Value, Measurements, Recurring \| NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	43.7	44.0
Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	9,627.3	8,997.8
Book Value \| Fair Value, Measurements, Recurring \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	18.8	51.1
Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	11,274.2	9,750.2
Fair Value \| Fair Value, Measurements, Recurring \| Level 2 \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	19.1	51.5
Evergy Kansas Central \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	309.8	272.5
Evergy Kansas Central \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Fair Value, Measurements, Recurring \| NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	43.7	44.0
Evergy Kansas Central \| Fair Value, Measurements, Recurring \| NAV \| Nuclear decommissioning trust:
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	43.7	44.0
Evergy Kansas Central \| Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	3,931.5	3,686.1
Evergy Kansas Central \| Book Value \| Fair Value, Measurements, Recurring \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	18.8	51.1
Evergy Kansas Central \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	4,801.7	4,078.8
Evergy Kansas Central \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2 \| Variable Interest Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	19.1	51.5
Evergy Metro \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	342.3	300.7
Evergy Metro \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	47.8	36.2
Evergy Metro \| Fair Value, Measurements, Recurring \| NAV
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Book Value \| Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	2,923.0	2,525.0
Evergy Metro \| Fair Value \| Fair Value, Measurements, Recurring \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	3,591.2	2,932.2
Long-Term debt fair value adjustment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	110.4	125.5
Long-Term debt fair value adjustment \| Evergy Kansas Central
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	0.0	0.0
Long-Term debt fair value adjustment \| Evergy Metro
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt gross	$ 0.0	$ 0.0

FAIR VALUE MEASUREMENTS - NAV (Details) $ in Millions	12 Months Ended
FAIR VALUE MEASUREMENTS - NAV (Details) $ in Millions	Dec. 31, 2020 USD ($) fund extension	Dec. 31, 2019 USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 2.2	$ 3.3
Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Nuclear decommissioning trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	2.2	3.3
Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Evergy Kansas Central \| Rabbi trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0.0	0.0
Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	$ 2.2	3.3
NAV, number of funds \| fund	5
NAV, number of funds making distributions \| fund	3
Domestic \| Evergy Kansas Central \| Equity Securities - Fourth Fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Length of settlement	15 years
NAV, number of extensions \| extension	3
NAV, extension term	1 year
Domestic \| Evergy Kansas Central \| Equity Securities - Fifth Fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Length of settlement	15 years
Fair Value, Measurements, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 652.1	573.2
Total rabbi trust	46.3	45.5
Total Assets	711.6	628.6
Fair Value, Measurements, Recurring \| Evergy Kansas Central
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	309.8	272.5
Total rabbi trust	32.7	31.7
Total Assets	342.5	304.2
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	23.2	23.9
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	12.9	12.6
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	40.6	39.3
Total rabbi trust	25.6	25.3
Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	20.1	16.4
Total rabbi trust	7.1	6.3
Fair Value, Measurements, Recurring \| Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	13.6	13.8
Fair Value, Measurements, Recurring \| Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	102.7	86.1
NAV \| Fair Value, Measurements, Recurring
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	43.7	44.0
Total rabbi trust	45.8	44.9
Total Assets	89.5	88.9
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	43.7	44.0
Total rabbi trust	32.7	31.6
Total Assets	76.4	75.6
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Alternative investments fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 23.2	23.9
Length of Settlement	65 days
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Real estate securities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 12.9	12.6
Length of Settlement	65 days
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Nuclear decommissioning trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 43.7	44.0
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Core bond fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	25.6	25.3
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Combination debt/equity/other fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	7.1	6.3
NAV \| Fair Value, Measurements, Recurring \| Evergy Kansas Central \| Rabbi trust:
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	32.7	31.6
NAV \| Fair Value, Measurements, Recurring \| Other Evergy
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total rabbi trust	13.1	13.3
NAV \| Fair Value, Measurements, Recurring \| Domestic \| Evergy Kansas Central \| Equity securities
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Total nuclear decommissioning trust	$ 7.6	$ 7.5

FAIR VALUE MEASUREMENTS - Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	$ 45.2	$ 82.2	$ (53.6)
Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	45.5	74.0	(54.1)
Nuclear decommissioning trust - debt securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	5.3	5.1	(0.5)
Rabbi trusts - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	(5.6)	3.1	1.0
Evergy Kansas Central
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	15.8	36.5	(30.8)
Evergy Kansas Central \| Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	21.9	33.3	(31.8)
Evergy Kansas Central \| Rabbi trusts - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	(6.1)	3.2	1.0
Evergy Metro
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	28.9	45.8	(23.2)
Evergy Metro \| Nuclear decommissioning trust - equity securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	23.6	40.7	(20.7)
Evergy Metro \| Nuclear decommissioning trust - debt securities
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Line Items]
Unrealized gain (losses)	$ 5.3	$ 5.1	$ (2.5)

COMMITMENTS AND CONTINGENCIES - Narrative (Details) $ in Millions	Dec. 31, 2020 USD ($)
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Industry aggregate limit for nuclear insurance	$ 3,200.0
Industry aggregate limit for non nuclear insurance	1,800.0
Nuclear liability insurance, full limit of public liability	13,800.0
Nuclear liability insurance, maximum available commercial insurance	500.0
Nuclear liability insurance, industry wide retrospective assessment program	13,300.0
Nuclear liability insurance, owners insurance amount, maximum	137.6
Nuclear liability insurance, owners insurance, amount per incident	20.5
Nuclear liability insurance, owners property insurance, maximum	2,800.0
Nuclear liability insurance, owners nonnuclear property insurance, maximum	2,300.0
Nuclear liability insurance, owners property insurance assessment, maximum	33.2
Evergy
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Nuclear liability insurance, owners insurance amount, maximum	129.4
Nuclear liability insurance, owners insurance, amount per incident	19.2
Nuclear liability insurance, owners property insurance assessment, maximum	31.2
Evergy Kansas Central
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Nuclear liability insurance, owners insurance amount, maximum	64.7
Nuclear liability insurance, owners insurance, amount per incident	9.6
Nuclear liability insurance, owners property insurance assessment, maximum	15.6
Evergy Metro
Estimates Of Environmental Financial Impact And Related Issues [Line Items]
Nuclear liability insurance, owners insurance amount, maximum	64.7
Nuclear liability insurance, owners insurance, amount per incident	9.6
Nuclear liability insurance, owners property insurance assessment, maximum	$ 15.6

COMMITMENTS AND CONTINGENCIES - Contractual Commitments (Details) $ in Millions	Dec. 31, 2020 USD ($)
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	$ 509.0
2022	206.6
2023	217.1
2024	178.8
2025	168.3
After 2025	529.7
Total	1,809.5
Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	311.2
2022	118.3
2023	134.6
2024	97.6
2025	88.4
After 2025	94.0
Total	844.1
Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	62.4
2022	62.6
2023	63.2
2024	57.6
2025	58.0
After 2025	349.7
Total	653.5
Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	135.4
2022	25.7
2023	19.3
2024	23.6
2025	21.9
After 2025	86.0
Total	311.9
Evergy Kansas Central
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	217.3
2022	84.9
2023	94.6
2024	72.0
2025	66.1
After 2025	60.4
Total	595.3
Evergy Kansas Central \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	149.3
2022	74.9
2023	85.5
2024	66.8
2025	62.3
After 2025	56.0
Total	494.8
Evergy Kansas Central \| Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	1.4
2022	0.9
2023	0.9
2024	0.9
2025	0.9
After 2025	4.4
Total	9.4
Evergy Kansas Central \| Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	66.6
2022	9.1
2023	8.2
2024	4.3
2025	2.9
After 2025	0.0
Total	91.1
Evergy Metro
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	232.7
2022	89.1
2023	91.7
2024	75.9
2025	70.9
After 2025	315.5
Total	875.8
Evergy Metro \| Fuel
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	142.8
2022	38.8
2023	46.3
2024	27.9
2025	23.2
After 2025	38.0
Total	317.0
Evergy Metro \| Power
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	34.9
2022	35.1
2023	35.3
2024	29.2
2025	29.2
After 2025	196.1
Total	359.8
Evergy Metro \| Other
Unrecorded Unconditional Purchase Obligations and Lease Commitments [Line Items]
2021	55.0
2022	15.2
2023	10.1
2024	18.8
2025	18.5
After 2025	81.4
Total	$ 199.0

GUARANTEES (Details) $ in Millions	Dec. 31, 2020 USD ($)
Guarantor Obligations [Line Items]
Maximum exposure	$ 140.0
Commercial Paper \| Evergy Missouri West
Guarantor Obligations [Line Items]
Maximum exposure	65.0
Guarantee \| Evergy Kansas Central
Guarantor Obligations [Line Items]
Maximum exposure	48.0
Guarantee \| Evergy Metro
Guarantor Obligations [Line Items]
Maximum exposure	48.0
Guarantee of Indebtedness of Others \| Evergy Missouri West
Guarantor Obligations [Line Items]
Maximum exposure	$ 92.0

RELATED PARTY TRANSACTIONS AND RELATIONSHIPS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	$ 93.2
Evergy Metro
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	71.3
Evergy Metro \| Evergy Inc Money Pool
Related Party Transaction [Line Items]
Due from Related Parties, Current	100.0
Due to Related Parties, Current	0.0
Due from (to) related parties		$ 0.0
Evergy Metro \| Evergy Missouri West
Related Party Transaction [Line Items]
Due from (to) related parties	188.1	78.7
Evergy Metro \| Evergy Missouri West \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	168.7	172.8	$ 183.2
Evergy Metro \| Evergy Kansas Central
Related Party Transaction [Line Items]
Due from (to) related parties	21.7	14.9
Evergy Metro \| Evergy Kansas Central \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	130.8	154.9	82.9
Evergy Metro \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	15.7	(4.3)
Evergy Metro \| Evergy \| Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	3.2
Evergy Metro \| Evergy \| Income Taxes Payable
Related Party Transaction [Line Items]
Due from (to) related parties		14.1
Evergy Kansas Central
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	34.4
Evergy Kansas Central \| Evergy Missouri West
Related Party Transaction [Line Items]
Due from (to) related parties	6.6	3.1
Evergy Kansas Central \| Evergy Missouri West \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	37.6	24.9	12.3
Evergy Kansas Central \| Evergy Metro
Related Party Transaction [Line Items]
Due from (to) related parties	(21.7)	(14.9)
Evergy Kansas Central \| Evergy Metro \| Operating Expenses and Capital Costs Billed
Related Party Transaction [Line Items]
Related party transaction	34.7	40.6	$ 17.5
Evergy Kansas Central \| Evergy
Related Party Transaction [Line Items]
Due from (to) related parties	0.1	6.9
Evergy Kansas Central \| Evergy \| Income Tax Receivable
Related Party Transaction [Line Items]
Due from (to) related parties	25.3	37.9
Evergy Kansas Central \| Evergy Metro \| Subsidiary of Common Parent
Related Party Transaction [Line Items]
Right-of-use assets under operating leases	28.9	29.5
Lease liability recorded in other current liabilities	0.7	0.6
Total long-term obligations under operating leases	$ 28.2	$ 28.9
Jointly Owned Electricity Generation Plant Iatan No 1 And 2 \| Evergy Missouri West
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	18.00%
Jeffrey Energy Center \| Evergy Missouri West
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	8.00%
La Cygne Station \| Evergy Kansas Central
Related Party Transaction [Line Items]
Jointly owned utility plant, proportionate ownership share	50.00%

SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	17 Months Ended
	Dec. 31, 2019	Feb. 25, 2021	Dec. 31, 2020	Jul. 31, 2018
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	600,000,000		600,000,000
Preferred stock, shares authorized (in shares)			12,000,000
Number of shares authorized to be repurchased (in shares)				60,000,000
Stock repurchased and retired during period under repurchase plan, value	$ 2,671.0
Stock repurchased and retired during period (in shares)	45,200,000
Restriction on payment of dividends (at least)			35.00%
Restricted net assets of subsidiaries			$ 5,700.0
Subsequent Event
Line of Credit Facility [Line Items]
Stock to be Sold and Issued Under Securities Purchase Agreement, Shares		2,269,447
Stock to be Sold and Issued Under Securities Purchase Agreement, Value		$ 113.2
Warrant to be Issued Under Securities Purchase Agreement for Potential Shares, Maximum		3,950,000
Warrants and Rights Outstanding, Term		3 years
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 64.70
Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)			65.00%
Evergy Kansas Central
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	1,000		1,000
Restriction on payment of dividends (at least)			40.00%
Evergy Kansas Central \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)			65.00%
Evergy Metro
Line of Credit Facility [Line Items]
Common stock, shares authorized (in shares)	1,000		1,000
Restriction on payment of dividends (at least)			40.00%
Retained earnings restrictions			$ 385.6
Evergy Metro \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)			65.00%
Evergy Missouri West \| Cash Borrowings
Line of Credit Facility [Line Items]
Debt instrument, debt to capitalization ratio (no more than)			65.00%

SHAREHOLDERS' EQUITY - Common Stock Repurchase Program (Details) shares in Millions	Dec. 31, 2020 USD ($) shares
August 2018 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 450,000,000.0
Shares Delivered (in shares) \| shares	7.9
November 2018 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 475,000,000.0
Shares Delivered (in shares) \| shares	8.3
March 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 450,000,000.0
Shares Delivered (in shares) \| shares	7.8
June 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 500,000,000.0
Shares Delivered (in shares) \| shares	8.1
September 2019 ASR Agreement
Line of Credit Facility [Line Items]
Stock repurchase program, authorized amount \| $	$ 500,000,000.0
Shares Delivered (in shares) \| shares	7.8

VARIABLE INTEREST ENTITIES - Narrative (Details)	1 Months Ended		3 Months Ended	12 Months Ended
VARIABLE INTEREST ENTITIES - Narrative (Details)	Aug. 31, 2019	Jul. 31, 2017	Mar. 31, 2019	Dec. 31, 2020
Jeffrey Energy Center
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%	8.00%	8.00%	8.00%
La Cygne Unit 2 [Member]
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%
Evergy Kansas Central \| Jeffrey Energy Center
Variable Interest Entity [Line Items]
VIE ownership percentage	8.00%
Evergy Kansas Central \| La Cygne Unit 2 [Member]
Variable Interest Entity [Line Items]
VIE ownership percentage				50.00%

VARIABLE INTEREST ENTITIES - Assets and Liabilities Related to VIE (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets:
Property, plant and equipment of variable interest entities, net	$ 19,951.0	$ 19,184.4
Liabilities:
Current maturities of long-term debt of variable interest entities	436.4	251.1
Accrued interest	123.4	122.3
Long-term debt, net	9,190.9	8,746.7
Variable Interest Entities
Assets:
Property, plant and equipment of variable interest entities, net	154.9	162.0
Liabilities:
Current maturities of long-term debt of variable interest entities	18.8	32.3
Accrued interest	0.1	0.3
Long-term debt, net	0.0	18.8
Evergy Kansas Central
Assets:
Property, plant and equipment of variable interest entities, net	10,193.6	9,864.9
Liabilities:
Current maturities of long-term debt of variable interest entities	0.0	250.0
Accrued interest	72.8	74.2
Long-term debt, net	3,931.5	3,436.1
Evergy Kansas Central \| Variable Interest Entities
Assets:
Property, plant and equipment of variable interest entities, net	154.9	162.0
Liabilities:
Current maturities of long-term debt of variable interest entities	18.8	32.3
Long-term debt, net	$ 0.0	$ 18.8

TAXES - Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income taxes
Federal	$ (26.8)	$ (39.5)	$ (67.4)
State	2.1	15.0	2.2
Total	(24.7)	(24.5)	(65.2)
Deferred income taxes
Federal	73.1	93.2	160.1
State	59.8	27.5	(32.3)
Total	132.9	120.7	127.8
Investment Tax Credits
Amortization	(6.0)	(4.4)	(3.6)
Deferral	0.0	5.2	0.0
Total	(6.0)	0.8	(3.6)
Income tax expense	$ 102.2	$ 97.0	$ 59.0
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%
Effect of:
COLI policies	(1.60%)	(1.80%)	(1.90%)
State income taxes	4.30%	5.00%	4.90%
Flow through depreciation for plant-related differences	(5.30%)	(4.50%)	0.80%
Federal tax credits	(4.60%)	(4.90%)	(6.40%)
Non-controlling interest	(0.30%)	(0.40%)	(0.40%)
AFUDC equity	(0.50%)	(0.10%)	(0.10%)
Amortization of federal investment tax credits	(0.60%)	(0.50%)	(0.60%)
Changes In Uncertain Tax Positions, Net	0.00%	(0.20%)	0.10%
Federal or state tax rate change	1.90%	0.00%	(8.70%)
Valuation allowance	(0.20%)	(1.00%)	0.40%
Stock compensation	(0.10%)	0.10%	(0.40%)
Officer compensation limitation	0.20%	0.10%	1.20%
Other	(0.20%)	(0.40%)	(0.20%)
Effective income tax rate	14.00%	12.40%	9.70%
Evergy Kansas Central
Current income taxes
Federal	$ 14.5	$ 37.9	$ (0.3)
State	(5.3)	2.6	(1.8)
Total	9.2	40.5	(2.1)
Deferred income taxes
Federal	(16.7)	(8.9)	43.5
State	168.1	18.4	(42.9)
Total	151.4	9.5	0.6
Investment Tax Credits
Amortization	(4.8)	(3.1)	(2.8)
Deferral	0.0	5.2	0.0
Total	(4.8)	2.1	(2.8)
Income tax expense	$ 155.8	$ 52.1	$ (4.3)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%
Effect of:
COLI policies	(2.80%)	(3.30%)	(3.30%)
State income taxes	3.80%	5.30%	5.00%
Flow through depreciation for plant-related differences	(0.10%)	(0.10%)	1.60%
Federal tax credits	(7.10%)	(7.40%)	(10.40%)
Non-controlling interest	(0.60%)	(0.80%)	(0.60%)
AFUDC equity	(0.50%)	(0.10%)	(0.20%)
Amortization of federal investment tax credits	(0.70%)	(0.70%)	(0.80%)
Changes In Uncertain Tax Positions, Net	0.00%	(0.40%)	0.10%
Federal or state tax rate change	27.80%	0.00%	(15.30%)
Valuation allowance	0.00%	(0.40%)	0.50%
Stock compensation	(0.10%)	(0.10%)	(0.80%)
Officer compensation limitation	0.00%	0.00%	1.80%
Other	(0.90%)	(0.30%)	0.20%
Effective income tax rate	39.80%	12.70%	(1.20%)
Evergy Metro
Current income taxes
Federal	$ (0.2)	$ 43.9	$ 29.8
State	10.8	22.4	8.9
Total	10.6	66.3	38.7
Deferred income taxes
Federal	29.8	(24.5)	(3.4)
State	(32.2)	(5.0)	53.0
Total	(2.4)	(29.5)	49.6
Investment Tax Credits
Amortization	(1.1)	(1.1)	(1.0)
Total	(1.1)	(1.1)	(1.0)
Income tax expense	$ 7.1	$ 35.7	$ 87.3
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%
Effect of:
COLI policies	(0.30%)	(0.20%)	(0.20%)
State income taxes	4.90%	4.70%	5.50%
Flow through depreciation for plant-related differences	(10.00%)	(9.40%)	(2.50%)
Federal tax credits	(1.90%)	(2.50%)	(2.10%)
AFUDC equity	(0.50%)	(0.20%)	(0.10%)
Amortization of federal investment tax credits	(0.40%)	(0.40%)	(0.40%)
Federal or state tax rate change	(10.50%)	0.00%	14.10%
Stock compensation	(0.40%)	0.00%	0.00%
Officer compensation limitation	0.40%	0.30%	0.60%
Other	0.00%	(1.00%)	(1.00%)
Effective income tax rate	2.30%	12.30%	34.90%

TAXES - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Tax credit carryforward	$ 379.6	$ 548.9
Income taxes refundable to customers, net	418.2	466.3
Deferred employee benefit costs	227.6	197.0
Net operating loss carryforward	51.0	163.4
Deferred state income taxes	145.9	64.4
Alternative minimum tax carryforward	0.0	37.9
Accrued liabilities	152.7	80.4
Other	181.0	183.2
Total deferred tax assets before valuation allowance	1,556.0	1,741.5
Valuation allowances	(14.4)	(17.5)
Total deferred tax assets, net	1,541.6	1,724.0
Deferred tax liabilities:
Plant-related	(2,693.7)	(3,004.8)
Deferred employee benefit costs	(171.4)	(173.3)
ARO regulatory assets	(136.7)	(102.3)
Acquisition premium	(46.9)	(68.2)
Other	(157.7)	(119.8)
Total deferred tax liabilities	(3,206.4)	(3,468.4)
Net deferred income tax liabilities	(1,664.8)	(1,744.4)
Evergy Kansas Central
Deferred tax assets:
Tax credit carryforward	176.5	337.3
Income taxes refundable to customers, net	237.5	234.3
Deferred employee benefit costs	105.4	93.4
Net operating loss carryforward	0.0	23.1
Deferred state income taxes	101.7	64.4
Alternative minimum tax carryforward	0.0	13.4
Accrued liabilities	61.8	14.5
Other	91.4	99.1
Total deferred tax assets before valuation allowance	774.3	879.5
Valuation allowances	0.0	0.0
Total deferred tax assets, net	774.3	879.5
Deferred tax liabilities:
Plant-related	(1,341.2)	(1,428.3)
Deferred employee benefit costs	(75.6)	(93.4)
ARO regulatory assets	(49.9)	(53.4)
Acquisition premium	(46.9)	(68.2)
Other	(85.2)	(53.9)
Total deferred tax liabilities	(1,598.8)	(1,697.2)
Net deferred income tax liabilities	(824.5)	(817.7)
Evergy Metro
Deferred tax assets:
Tax credit carryforward	195.9	204.4
Income taxes refundable to customers, net	132.8	176.2
Deferred employee benefit costs	117.9	120.4
Net operating loss carryforward	0.2	61.9
Deferred state income taxes	37.8	0.0
Alternative minimum tax carryforward	0.0	0.0
Accrued liabilities	61.0	29.1
Other	44.8	55.1
Total deferred tax assets before valuation allowance	590.4	647.1
Valuation allowances	0.0	0.0
Total deferred tax assets, net	590.4	647.1
Deferred tax liabilities:
Plant-related	(972.1)	(1,143.2)
Deferred employee benefit costs	(76.3)	(79.5)
ARO regulatory assets	(54.3)	(13.8)
Acquisition premium	0.0	0.0
Other	(46.5)	(53.4)
Total deferred tax liabilities	(1,149.2)	(1,289.9)
Net deferred income tax liabilities	$ (558.8)	$ (642.8)

TAXES - Net Operating Loss Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	$ 42.2	$ 132.4
Operating loss carryforwards of federal income tax benefit	7.1
Tax credit carryforward, amount	379.6
Federal Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount		37.9
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Tax benefits related to NOLs	7.1
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	8.8	31.0
Operating loss carryforwards of federal income tax benefit	7.1
Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	176.5
Evergy Kansas Central \| Federal Alternative Minimum Tax Credit Carryforward
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount		13.4
Evergy Kansas Central \| Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Deferred tax benefits		12.3
Evergy Kansas Central \| State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits		10.8
Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	195.9
Evergy Metro \| Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Deferred tax benefits		56.2
Evergy Metro \| State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	0.2	$ 5.7
2005
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	10.2
Tax credit carryforward, amount	0.1
2005 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	0.0
2005 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	0.0
2006
Operating Loss Carryforwards [Line Items]
Deferred tax benefits	32.0
Tax credit carryforward, amount	0.1
2006 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	0.0
2006 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	0.0
2014
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	24.1
2014 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	10.7
2014 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	13.0
2015
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	24.7
2015 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	10.9
2015 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	13.2
2016
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	27.1
2016 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	11.0
2016 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	12.4
2017
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	43.9
2017 \| Evergy Kansas Central
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	35.1
2017 \| Evergy Metro
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	$ 8.2

TAXES - Valuation Allowance (Details) $ in Millions	12 Months Ended
TAXES - Valuation Allowance (Details) $ in Millions	Dec. 31, 2020 USD ($)
Income Tax Disclosure [Abstract]
Tax benefit	$ 3.1

TAXES - State Tax Reform (Details) - USD ($) $ in Millions			12 Months Ended
TAXES - State Tax Reform (Details) - USD ($) $ in Millions	May 01, 2020	Jun. 01, 2018	Dec. 31, 2020
State Tax Reform [Line Items]
Decrease in net deferred income tax liabilities due to tax reform	$ 233.8
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base	400.4
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform	31.7
Decrease in unamortized investment tax credits	183.6
Decrease in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes	16.9
Income tax expense from tax reform	13.8
Kansas state statutory income tax rate thru 2020			7.00%
Evergy Kansas Central
State Tax Reform [Line Items]
Decrease in net deferred income tax liabilities due to tax reform	17.6
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base	293.7
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform	17.3
Decrease in unamortized investment tax credits	183.6
Decrease in unamortized investment tax credits for tax gross up adjustment for ratemaking purposes	16.9
Income tax expense from tax reform	109.0
Evergy Metro
State Tax Reform [Line Items]
Decrease in net deferred income tax liabilities due to tax reform	152.9	$ 46.6
Decrease in net deferred income tax liabilities for revaluation of deferred income tax assets and liabilities in rate base	106.7	28.8
Decrease in net deferred income tax liabilities for tax gross-up adjustment for ratemaking purposes due to tax reform	14.4	9.9
Income tax expense from tax reform	$ 32.2	$ 15.5

LEASES - Narrative (Details)	12 Months Ended
LEASES - Narrative (Details)	Dec. 31, 2020
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum \| Evergy Kansas Central
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Minimum \| Evergy Metro
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	18 years
Maximum \| Evergy Kansas Central
Lessee, Lease, Description [Line Items]
Remaining lease term	18 years
Maximum \| Evergy Metro
Lessee, Lease, Description [Line Items]
Remaining lease term	25 years

LEASES - Schedule of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finance lease costs
Amortization of right-of-use assets	$ 7.7	$ 5.2
Interest on lease liabilities	3.1	2.9
Operating lease costs	22.9	23.8
Short-term lease costs	2.1	4.0
Variable lease costs for renewable purchase power agreements	296.6	313.0
Total lease costs	332.4	348.9
Evergy Kansas Central
Finance lease costs
Amortization of right-of-use assets	7.2	5.0
Interest on lease liabilities	2.8	2.7
Operating lease costs	11.9	13.2
Short-term lease costs	0.5	1.2
Variable lease costs for renewable purchase power agreements	135.6	130.8
Total lease costs	158.0	152.9
Evergy Metro
Finance lease costs
Amortization of right-of-use assets	0.3	0.1
Interest on lease liabilities	0.1	0.1
Operating lease costs	9.3	9.2
Short-term lease costs	1.5	2.6
Variable lease costs for renewable purchase power agreements	112.2	129.2
Total lease costs	$ 123.4	$ 141.2

LEASES - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 22.2	$ 21.7
Operating cash flows from finance leases	2.8	2.8
Financing cash flows from finance leases	5.6	5.0
Right-of-use assets obtained in exchange for new operating lease liabilities	6.9	10.4
Right-of-use assets obtained in exchange for new finance lease liabilities	5.6	8.3
Evergy Kansas Central
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	12.9	13.7
Operating cash flows from finance leases	2.5	2.6
Financing cash flows from finance leases	5.1	4.8
Right-of-use assets obtained in exchange for new operating lease liabilities	6.6	6.1
Right-of-use assets obtained in exchange for new finance lease liabilities	4.0	8.3
Evergy Metro
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	10.8	9.9
Operating cash flows from finance leases	0.1	0.1
Financing cash flows from finance leases	0.4	0.1
Right-of-use assets obtained in exchange for new operating lease liabilities	0.3	2.4
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 1.6	$ 0.0

LEASES - Schedule of Future Payments for Finance Leases (Details) $ in Millions	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
2021	$ 8.8
2022	7.3
2023	6.6
2024	5.3
2025	4.6
After 2025	42.4
Total finance lease payments	75.0
Amounts representing imputed interest	(23.7)
Present value of lease payments	51.3
Less: current portion	(6.0)
Total long-term obligations under finance leases	45.3
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 314.1
Weighted-average remaining lease term (years)	13 years 6 months
Weighted-average discount rate	5.60%
Evergy Kansas Central
Lessee, Lease, Description [Line Items]
2021	$ 8.0
2022	6.5
2023	5.8
2024	4.6
2025	4.1
After 2025	41.2
Total finance lease payments	70.2
Amounts representing imputed interest	(22.7)
Present value of lease payments	47.5
Less: current portion	(5.6)
Total long-term obligations under finance leases	41.9
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 53.9
Weighted-average remaining lease term (years)	14 years 1 month 6 days
Weighted-average discount rate	5.50%
Evergy Metro
Lessee, Lease, Description [Line Items]
2021	$ 0.6
2022	0.6
2023	0.6
2024	0.6
2025	0.2
After 2025	0.6
Total finance lease payments	3.2
Amounts representing imputed interest	(0.6)
Present value of lease payments	2.6
Less: current portion	(0.4)
Total long-term obligations under finance leases	2.2
Right-of-use assets under finance leases included in property, plant and equipment, net on the consolidated balance sheets	$ 2.6
Weighted-average remaining lease term (years)	5 years 10 months 24 days
Weighted-average discount rate	4.90%

LEASES - Schedule of Future Payments for Operating Leases (Details) $ in Millions	Dec. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
2021	$ 18.5
2022	15.3
2023	12.2
2024	10.4
2025	7.9
After 2025	37.3
Total operating lease payments	101.6
Amounts representing imputed interest	(14.4)
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 93.2
Weighted-average remaining lease term (years)	8 years 3 months 18 days
Weighted-average discount rate	3.70%
Other Liabilities
Lessee, Lease, Description [Line Items]
Present value of lease payments	$ 87.2
Other Current Liabilities
Lessee, Lease, Description [Line Items]
Less: current portion	(14.5)
Other Noncurrent Liabilities
Lessee, Lease, Description [Line Items]
Total long-term obligations under operating leases	72.7
Evergy Kansas Central
Lessee, Lease, Description [Line Items]
2021	10.1
2022	7.7
2023	5.0
2024	3.5
2025	1.5
After 2025	0.4
Total operating lease payments	28.2
Amounts representing imputed interest	(0.8)
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 34.4
Weighted-average remaining lease term (years)	3 years 4 months 24 days
Weighted-average discount rate	2.90%
Evergy Kansas Central \| Other Liabilities
Lessee, Lease, Description [Line Items]
Present value of lease payments	$ 27.4
Evergy Kansas Central \| Other Current Liabilities
Lessee, Lease, Description [Line Items]
Less: current portion	(8.2)
Evergy Kansas Central \| Other Noncurrent Liabilities
Lessee, Lease, Description [Line Items]
Total long-term obligations under operating leases	19.2
Evergy Metro
Lessee, Lease, Description [Line Items]
2021	10.1
2022	9.3
2023	8.8
2024	8.5
2025	8.3
After 2025	74.5
Total operating lease payments	119.5
Amounts representing imputed interest	(31.4)
Right-of-use assets under operating leases included in other assets on the consolidated balance sheets	$ 71.3
Weighted-average remaining lease term (years)	15 years 3 months 18 days
Weighted-average discount rate	4.10%
Evergy Metro \| Other Liabilities
Lessee, Lease, Description [Line Items]
Present value of lease payments	$ 88.1
Evergy Metro \| Other Current Liabilities
Lessee, Lease, Description [Line Items]
Less: current portion	(6.7)
Evergy Metro \| Other Noncurrent Liabilities
Lessee, Lease, Description [Line Items]
Total long-term obligations under operating leases	$ 81.4

QUARTERLY OPERATING RESULTS (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating revenue	$ 1,094.4	$ 1,517.6	$ 1,184.7	$ 1,116.7	$ 1,131.6	$ 1,577.6	$ 1,221.7	$ 1,216.9	$ 4,913.4	$ 5,147.8	$ 4,275.9
Operating Income	153.0	521.7	271.7	197.5	165.8	538.7	271.7	209.6	1,143.9	1,185.8	933.6
Net income	54.0	367.5	136.3	72.2	66.7	370.9	144.6	103.4	630.0	685.6	546.0
Net income attributable to Evergy, Inc.	$ 51.0	$ 364.5	$ 133.4	$ 69.4	$ 63.9	$ 366.8	$ 139.7	$ 99.5	618.3	669.9	535.8
Basic and diluted earnings per common share (in dollars per share)	$ 0.22	$ 1.60	$ 0.59	$ 0.31	$ 0.28	$ 1.56	$ 0.57	$ 0.39
Evergy Kansas Central
Operating revenue	$ 553.6	$ 733.6	$ 570.8	$ 560.1	$ 576.1	$ 749.0	$ 585.5	$ 596.8	2,418.1	2,507.4	2,614.9
Operating Income	90.9	240.7	121.2	114.5	102.2	242.4	127.6	124.3	567.3	596.5	550.5
Net income	45.1	173.1	(37.6)	55.2	55.4	168.2	67.2	68.3	235.8	359.1	349.1
Net income attributable to Evergy, Inc.	42.1	170.1	(40.5)	52.4	52.6	164.1	62.3	64.4	224.1	343.4	338.9
Evergy Metro
Operating revenue	377.3	528.5	424.3	375.5	375.3	568.8	437.0	425.4	1,705.6	1,806.5	1,823.1
Operating Income	53.7	204.4	112.5	63.7	52.2	215.5	101.9	56.9	434.3	426.5	409.8
Net income	$ 22.5	$ 147.7	$ 102.9	$ 25.6	$ 27.9	$ 151.9	$ 59.4	$ 16.0	298.7	255.2	162.9
Net income attributable to Evergy, Inc.									$ 298.7	$ 255.2	$ 162.9

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669619-108580

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8924-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 11
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(22))
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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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+ Details

Schedule I Financial Statements of Parent Company Statements of Income (Details) - USD ($) $ in Millions	3 Months Ended								7 Months Ended	10 Months Ended	12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
OPERATING EXPENSES:
Operating and maintenance											$ 1,163.0	$ 1,218.5	$ 1,115.8
Total Operating Expenses											3,769.5	3,962.0	3,342.3
INCOME FROM OPERATIONS	$ 153.0	$ 521.7	$ 271.7	$ 197.5	$ 165.8	$ 538.7	$ 271.7	$ 209.6			1,143.9	1,185.8	933.6
OTHER INCOME (EXPENSE):
Equity in earnings from subsidiaries											8.3	9.8	5.4
Other expense											(78.2)	(76.9)	(78.7)
Total Other Expense, Net											(36.1)	(39.0)	(54.4)
Interest expense											383.9	374.0	279.6
INCOME BEFORE INCOME TAXES											723.9	772.8	599.6
Income tax expense (benefit)											102.2	97.0	59.0
Net income attributable to Evergy, Inc.	51.0	364.5	133.4	69.4	63.9	366.8	139.7	99.5			618.3	669.9	535.8
COMPREHENSIVE INCOME
NET INCOME	$ 54.0	$ 367.5	$ 136.3	$ 72.2	$ 66.7	$ 370.9	$ 144.6	$ 103.4			630.0	685.6	546.0
Derivative hedging activity
Loss on derivative hedging instruments										$ (69.8)	0.0	(64.4)	(5.4)
Income tax benefit											0.0	16.5	1.4
Net loss on derivative hedging instruments											0.0	(47.9)	(4.0)
Reclassification to expenses, net of taxes											(3.0)	(1.5)	0.0
Derivative hedging activity, net of tax											3.0	(46.4)	(4.0)
Total other comprehensive income (loss)											0.6	(47.0)	(3.0)
COMPREHENSIVE INCOME											618.9	622.9	$ 532.8
Parent
OPERATING EXPENSES:
Operating and maintenance									$ 54.6		39.3	19.4
Total Operating Expenses									54.6		39.3	19.4
INCOME FROM OPERATIONS									(54.6)		(39.3)	(19.4)
OTHER INCOME (EXPENSE):
Equity in earnings from subsidiaries									364.7		683.4	698.2
Investment earnings									26.3		32.1	32.7
Other expense									(2.6)		(0.1)	(0.1)
Total Other Expense, Net									388.4		715.4	730.8
Interest expense									19.6		86.3	60.7
INCOME BEFORE INCOME TAXES									314.2		589.8	650.7
Income tax expense (benefit)									(10.7)		(22.7)	(13.7)
Net income attributable to Evergy, Inc.									324.9		612.5	664.4
Derivative hedging activity
Loss on derivative hedging instruments									(5.4)		0.0	(64.4)
Income tax benefit									1.4		0.0	16.5
Net loss on derivative hedging instruments									(4.0)		0.0	(47.9)
Reclassification to expenses, net of taxes									0.0		3.0	1.5
Derivative hedging activity, net of tax									(4.0)		3.0	(46.4)
Other comprehensive income (loss) from subsidiaries, net									1.0		(2.4)	(0.6)
Total other comprehensive income (loss)									(3.0)		0.6	(47.0)
COMPREHENSIVE INCOME									$ 321.9		$ 613.1	$ 617.4

Schedule I Financial Statements of Parent Company Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 144.9	$ 23.2
Income taxes receivable	62.9	85.5
Prepaid expenses and other assets	71.9	78.2
Total Current Assets	1,624.3	1,467.7
OTHER ASSETS:
Other	527.7	511.5
TOTAL ASSETS	27,114.8	25,975.9
CURRENT LIABILITIES:
Current maturities of long-term debt	436.4	251.1
Accrued interest	123.4	122.3
Other	182.6	161.6
Total Current Liabilities	2,355.8	2,335.9
LONG-TERM LIABILITIES:
Long-term debt, net	9,190.9	8,746.7
Other	308.2	340.7
Total Long-Term Liabilities	16,040.5	15,094.7
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,836,670 and 226,641,443 shares issued	7,080.0	7,070.4
Retained earnings	1,702.8	1,551.5
Accumulated other comprehensive loss	(49.4)	(50.0)
Total Evergy, Inc. Shareholders' Equity	8,733.4	8,571.9
TOTAL LIABILITIES AND EQUITY	27,114.8	25,975.9
Parent
CURRENT ASSETS:
Cash and cash equivalents	11.0	11.6
Accounts receivable from subsidiaries	54.1	24.5
Notes receivable from subsidiaries	349.4	2.0
Income taxes receivable	7.4	8.0
Prepaid expenses and other assets	1.9	2.4
Total Current Assets	423.8	48.5
OTHER ASSETS:
Investment in subsidiaries	10,349.2	10,023.1
Note receivable from subsidiaries	287.5	634.9
Deferred income taxes	20.5	34.2
Other	0.5	0.9
Total Other Assets	10,657.7	10,693.1
TOTAL ASSETS	11,081.5	10,741.6
CURRENT LIABILITIES:
Current maturities of long-term debt	350.0	0.0
Notes payable	200.0	20.0
Related party payables	18.4	13.1
Accrued interest	13.9	14.6
Other	11.0	8.1
Total Current Liabilities	593.3	55.8
LONG-TERM LIABILITIES:
Long-term debt, net	1,875.7	2,223.7
Other	11.7	16.9
Total Long-Term Liabilities	1,887.4	2,240.6
Commitments and Contingencies (Note 15)
Evergy, Inc. Shareholders' Equity:
Common stock - 600,000,000 shares authorized, without par value, 226,836,670 and 226,641,443 shares issued	7,063.2	7,053.7
Retained earnings	1,587.0	1,441.5
Accumulated other comprehensive loss	(49.4)	(50.0)
Total Evergy, Inc. Shareholders' Equity	8,600.8	8,445.2
TOTAL LIABILITIES AND EQUITY	$ 11,081.5	$ 10,741.6

Schedule I Financial Statements of Parent Company Balance Sheet Parenthetical (Details) - shares	Dec. 31, 2020	Dec. 31, 2019
Condensed Balance Sheet Statements, Captions [Line Items]
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	226,836,670	226,641,443
Parent
Condensed Balance Sheet Statements, Captions [Line Items]
Common stock, shares authorized (in shares)	600,000,000	600,000,000
Common stock, shares issued (in shares)	226,836,670	226,641,443

Schedule I Financial Statements of Parent Company Statement of Cash Flows (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended								7 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income attributable to Evergy, Inc.		$ 51.0	$ 364.5	$ 133.4	$ 69.4	$ 63.9	$ 366.8	$ 139.7	$ 99.5		$ 618.3	$ 669.9	$ 535.8
Adjustments to reconcile income to net cash from operating activities:
Non-cash compensation											16.0	16.3	29.9
Net deferred income taxes and credits											126.9	121.5	124.2
Equity in earnings from subsidiaries											(8.3)	(9.8)	(5.4)
Other											0.8	(3.2)	(5.2)
Changes in working capital items:
Prepaid expenses and other current assets											16.9	43.4	(128.1)
Accrued taxes											6.7	(8.2)	(76.4)
Other current liabilities											(98.9)	(59.4)	92.0
Changes in other assets											119.5	79.8	66.8
Cash Flows from Operating Activities											1,753.8	1,749.0	1,497.8
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Cash acquired from the merger with Great Plains Energy											0.0	0.0	1,154.2
Proceeds from settlement of interest rate swap											0.0	0.0	140.6
Cash Flows from (used in) Investing Activities											(1,533.7)	(1,080.3)	197.4
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net											(246.9)	(176.7)	(104.0)
Proceeds from long-term debt											888.8	2,372.7	290.9
Payment for settlement of interest rate swap accounted for as a cash flow hedge	$ (69.8)										0.0	(69.8)	0.0
Cash dividends paid											(465.0)	(462.5)	(475.0)
Repurchase of common stock											0.0	(1,628.7)	(1,042.3)
Other financing activities											(13.6)	(6.7)	(21.3)
Cash Flows from (used in) Financing Activities											(98.4)	(805.8)	(1,538.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH											121.7	(137.1)	156.8
Beginning of period					23.2				160.3		23.2	160.3	3.5
End of period		144.9				23.2				$ 160.3	144.9	23.2	160.3
Parent
CASH FLOWS FROM (USED IN) OPERATING ACTIVITIES:
Net income attributable to Evergy, Inc.										324.9	612.5	664.4
Adjustments to reconcile income to net cash from operating activities:
Non-cash compensation										10.0	16.0	16.3
Net deferred income taxes and credits										(6.3)	9.6	21.4
Equity in earnings from subsidiaries										(364.7)	(683.4)	(698.2)
Other										0.0	7.0	2.1
Changes in working capital items:
Accounts receivable from subsidiaries										(8.5)	(30.0)	8.9
Income taxes receivable										(0.2)	0.6	(7.8)
Prepaid expenses and other current assets										(1.0)	0.8	(0.1)
Accounts payable to subsidiaries										4.7	5.0	(15.0)
Accrued taxes										(35.2)	0.0	0.0
Accrued interest										(13.6)	(0.7)	12.5
Other current liabilities										2.4	2.9	1.7
Cash dividends from subsidiaries										236.0	355.0	460.0
Changes in other assets										0.1	0.3	0.2
Changes in other liabilities										20.0	(3.7)	(3.5)
Cash Flows from Operating Activities										168.6	291.9	462.9
CASH FLOWS FROM (USED IN) INVESTING ACTIVITIES:
Cash acquired from the merger with Great Plains Energy										1,142.2	0.0	0.0
Proceeds from settlement of interest rate swap										140.6	0.0	0.0
Cash Flows from (used in) Investing Activities										1,282.8	0.0	0.0
CASH FLOWS FROM (USED IN) FINANCING ACTIVITIES:
Short-term debt, net										(56.1)	180.0	20.0
Proceeds from long-term debt										0.0	0.0	1,585.0
Payment for settlement of interest rate swap accounted for as a cash flow hedge										0.0	0.0	(69.8)
Cash dividends paid										(245.9)	(465.0)	(462.5)
Repurchase of common stock										(1,042.3)	0.0	(1,628.7)
Other financing activities										0.0	(7.5)	(2.4)
Cash Flows from (used in) Financing Activities										(1,344.3)	(292.5)	(558.4)
NET CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH										107.1	(0.6)	(95.5)
Beginning of period					$ 11.6				$ 107.1	0.0	11.6	107.1
End of period		$ 11.0				$ 11.6				$ 107.1	$ 11.0	$ 11.6	$ 107.1

Schedule I Financial Statements of Parent Company Schedule I Financial Statements of Parent Company - Dividends (Details) - USD ($) $ in Millions	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Parent
Condensed Financial Statements, Captions [Line Items]
Cash dividends from subsidiaries	$ 236.0	$ 355.0	$ 460.0

Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for uncollectible accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	$ 10.5	$ 9.2	$ 6.7
Additions Charged To Costs And Expenses	24.9	27.2	20.7
Additions Charged To Other Accounts	12.5	12.4	16.9
Deductions	28.6	38.3	35.1
Balance At End Of Period	19.3	10.5	9.2
Allowance for uncollectible accounts \| Evergy Kansas Central
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	3.8	3.9	6.7
Additions Charged To Costs And Expenses	11.1	7.2	9.0
Additions Charged To Other Accounts	2.6	3.4	7.4
Deductions	10.0	10.7	19.2
Balance At End Of Period	7.5	3.8	3.9
Allowance for uncollectible accounts \| Evergy Metro
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	4.6	3.8	2.2
Additions Charged To Costs And Expenses	9.0	13.7	13.1
Additions Charged To Other Accounts	6.9	6.3	4.4
Deductions	12.4	19.2	15.9
Balance At End Of Period	8.1	4.6	3.8
Tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	17.5	27.3	0.0
Additions Charged To Costs And Expenses	0.0	0.6	2.2
Additions Charged To Other Accounts	0.0	0.0	26.8
Deductions	3.1	10.4	1.7
Balance At End Of Period	14.4	17.5	27.3
Tax valuation allowance \| Evergy Kansas Central
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance At Beginning Of Period	$ 0.0	1.7	0.0
Additions Charged To Costs And Expenses		0.0	1.7
Additions Charged To Other Accounts		0.0	0.0
Deductions		1.7	0.0
Balance At End Of Period		$ 0.0	$ 1.7

PENSION PLANS AND POST-RETIREMENT BENEFITS - Target Asset Allocations (Details)	Dec. 31, 2020
Evergy Kansas Central \| Pension Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	29.00%
Evergy Kansas Central \| Pension Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	20.00%
Evergy Kansas Central \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	36.00%
Evergy Kansas Central \| Pension Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Pension Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	4.00%
Evergy Kansas Central \| Pension Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	11.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	33.00%
Evergy Kansas Central \| Post-Retirement Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	22.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	45.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Kansas Central \| Post-Retirement Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro \| Pension Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	30.00%
Evergy Metro \| Pension Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	24.00%
Evergy Metro \| Pension Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	33.00%
Evergy Metro \| Pension Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro \| Pension Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	5.00%
Evergy Metro \| Pension Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	9.00%
Evergy Metro \| Post-Retirement Benefits \| Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	3.00%
Evergy Metro \| Post-Retirement Benefits \| International equities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro \| Post-Retirement Benefits \| Bonds
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	85.00%
Evergy Metro \| Post-Retirement Benefits \| Mortgage & asset backed securities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	4.00%
Evergy Metro \| Post-Retirement Benefits \| Real estate investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	0.00%
Evergy Metro \| Post-Retirement Benefits \| Other investments
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan assets, target allocation, percentage	7.00%

FAIR VALUE MEASUREMENTS - Recurring (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Assets
Total nuclear decommissioning trust	$ 652.1	$ 573.2
Total rabbi trust	46.3	45.5
Total self-insured health plan trust	13.2	9.9
Total Assets	711.6	628.6
Level 1
Assets
Total nuclear decommissioning trust	560.6	493.0
Total rabbi trust	0.5	0.6
Total self-insured health plan trust	8.0	4.6
Total Assets	569.1	498.2
Level 2
Assets
Total nuclear decommissioning trust	47.8	36.2
Total rabbi trust	0.0	0.0
Total self-insured health plan trust	5.2	5.3
Total Assets	53.0	41.5
Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
NAV
Assets
Total nuclear decommissioning trust	43.7	44.0
Total rabbi trust	45.8	44.9
Total self-insured health plan trust	0.0	0.0
Total Assets	89.5	88.9
Evergy Kansas Central
Assets
Total nuclear decommissioning trust	309.8	272.5
Total rabbi trust	32.7	31.7
Total Assets	342.5	304.2
Evergy Kansas Central \| Core bond fund
Assets
Total nuclear decommissioning trust	40.6	39.3
Total rabbi trust	25.6	25.3
Evergy Kansas Central \| High-yield bond fund
Assets
Total nuclear decommissioning trust	25.0	22.3
Evergy Kansas Central \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	21.0	19.4
Evergy Kansas Central \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	20.1	16.4
Total rabbi trust	7.1	6.3
Evergy Kansas Central \| Alternative investments fund
Assets
Total nuclear decommissioning trust	23.2	23.9
Evergy Kansas Central \| Real estate securities fund
Assets
Total nuclear decommissioning trust	12.9	12.6
Evergy Kansas Central \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.5	0.5
Total rabbi trust		0.1
Evergy Kansas Central \| Level 1
Assets
Total nuclear decommissioning trust	266.1	228.5
Total rabbi trust	0.0	0.1
Total Assets	266.1	228.6
Evergy Kansas Central \| Level 1 \| Core bond fund
Assets
Total nuclear decommissioning trust	40.6	39.3
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	25.0	22.3
Evergy Kansas Central \| Level 1 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	21.0	19.4
Evergy Kansas Central \| Level 1 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	20.1	16.4
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 1 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.5	0.5
Total rabbi trust		0.1
Evergy Kansas Central \| Level 2
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Kansas Central \| Level 2 \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 2 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust		0.0
Evergy Kansas Central \| Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Kansas Central \| Level 3 \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Alternative investments fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Real estate securities fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Level 3 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust		0.0
Evergy Kansas Central \| NAV
Assets
Total nuclear decommissioning trust	43.7	44.0
Total rabbi trust	32.7	31.6
Total Assets	76.4	75.6
Evergy Kansas Central \| NAV \| Core bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	25.6	25.3
Evergy Kansas Central \| NAV \| High-yield bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| NAV \| Emerging markets bond fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| NAV \| Combination debt/equity/other fund
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust	7.1	6.3
Evergy Kansas Central \| NAV \| Alternative investments fund
Assets
Total nuclear decommissioning trust	23.2	23.9
Evergy Kansas Central \| NAV \| Real estate securities fund
Assets
Total nuclear decommissioning trust	12.9	12.6
Evergy Kansas Central \| NAV \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Total rabbi trust		0.0
Evergy Kansas Central \| Domestic \| Equity securities
Assets
Total nuclear decommissioning trust	102.7	86.1
Evergy Kansas Central \| Domestic \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	95.1	78.6
Evergy Kansas Central \| Domestic \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Domestic \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| Domestic \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	7.6	7.5
Evergy Kansas Central \| International \| Equity securities
Assets
Total nuclear decommissioning trust	63.8	52.0
Evergy Kansas Central \| International \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	63.8	52.0
Evergy Kansas Central \| International \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| International \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Kansas Central \| International \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro
Assets
Total nuclear decommissioning trust	342.3	300.7
Total self-insured health plan trust	13.2	9.9
Total Assets	355.5	310.6
Evergy Metro \| Equity securities
Assets
Total nuclear decommissioning trust	243.1	211.1
Total self-insured health plan trust	1.7	0.5
Evergy Metro \| Cash equivalents
Assets
Total nuclear decommissioning trust	3.2	3.1
Evergy Metro \| U.S. Treasury
Assets
Total nuclear decommissioning trust	47.7	50.3
Evergy Metro \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.5	0.4
Evergy Metro \| State and local obligations
Assets
Total nuclear decommissioning trust	4.1	2.2
Evergy Metro \| Corporate bonds
Assets
Total nuclear decommissioning trust	43.1	33.2
Evergy Metro \| Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro \| Other
Assets
Total nuclear decommissioning trust	0.5	0.3
Evergy Metro \| Debt securities
Assets
Total self-insured health plan trust	8.0	6.7
Evergy Metro \| Cash and cash equivalents
Assets
Total self-insured health plan trust	3.5	2.7
Evergy Metro \| Level 1
Assets
Total nuclear decommissioning trust	294.5	264.5
Total self-insured health plan trust	8.0	4.6
Total Assets	302.5	269.1
Evergy Metro \| Level 1 \| Equity securities
Assets
Total nuclear decommissioning trust	243.1	211.1
Total self-insured health plan trust	1.7	0.5
Evergy Metro \| Level 1 \| Cash equivalents
Assets
Total nuclear decommissioning trust	3.2	3.1
Evergy Metro \| Level 1 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	47.7	50.3
Evergy Metro \| Level 1 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 1 \| Other
Assets
Total nuclear decommissioning trust	0.5	0.0
Evergy Metro \| Level 1 \| Debt securities
Assets
Total self-insured health plan trust	2.8	1.4
Evergy Metro \| Level 1 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	3.5	2.7
Evergy Metro \| Level 2
Assets
Total nuclear decommissioning trust	47.8	36.2
Total self-insured health plan trust	5.2	5.3
Total Assets	53.0	41.5
Evergy Metro \| Level 2 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 2 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 2 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 2 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.5	0.4
Evergy Metro \| Level 2 \| State and local obligations
Assets
Total nuclear decommissioning trust	4.1	2.2
Evergy Metro \| Level 2 \| Corporate bonds
Assets
Total nuclear decommissioning trust	43.1	33.2
Evergy Metro \| Level 2 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.1	0.1
Evergy Metro \| Level 2 \| Other
Assets
Total nuclear decommissioning trust	0.0	0.3
Evergy Metro \| Level 2 \| Debt securities
Assets
Total self-insured health plan trust	5.2	5.3
Evergy Metro \| Level 2 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Metro \| Level 3 \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3 \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Other
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| Level 3 \| Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| Level 3 \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Total Assets	0.0	0.0
Evergy Metro \| NAV \| Equity securities
Assets
Total nuclear decommissioning trust	0.0	0.0
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV \| Cash equivalents
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| U.S. Treasury
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| U.S. Agency
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| State and local obligations
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Corporate bonds
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Foreign governments
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Other
Assets
Total nuclear decommissioning trust	0.0	0.0
Evergy Metro \| NAV \| Debt securities
Assets
Total self-insured health plan trust	0.0	0.0
Evergy Metro \| NAV \| Cash and cash equivalents
Assets
Total self-insured health plan trust	0.0	0.0
Other Evergy
Assets
Total rabbi trust	13.6	13.8
Other Evergy \| Fixed income fund
Assets
Total rabbi trust	13.1	13.3
Other Evergy \| Cash and cash equivalents
Assets
Total rabbi trust	0.5	0.5
Other Evergy \| Level 1
Assets
Total rabbi trust	0.5	0.5
Other Evergy \| Level 1 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 1 \| Cash and cash equivalents
Assets
Total rabbi trust	0.5	0.5
Other Evergy \| Level 2
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 2 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 2 \| Cash and cash equivalents
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 3
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 3 \| Fixed income fund
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| Level 3 \| Cash and cash equivalents
Assets
Total rabbi trust	0.0	0.0
Other Evergy \| NAV
Assets
Total rabbi trust	13.1	13.3
Other Evergy \| NAV \| Fixed income fund
Assets
Total rabbi trust	13.1	13.3
Other Evergy \| NAV \| Cash and cash equivalents
Assets
Total rabbi trust	$ 0.0	$ 0.0

TAXES - Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 379.6
Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	176.5
Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	195.9
General Business Tax Credit Carryforward
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	379.6	$ 379.0
Amount of tax credit acquired in business combination	0.2
Valuation allowance	0.2
General Business Tax Credit Carryforward \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	176.5	168.8
General Business Tax Credit Carryforward \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	195.9	203.2
State and Local Jurisdiction
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount		169.9
State and Local Jurisdiction \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount		168.5
State and Local Jurisdiction \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount		1.2
Federal Alternative Minimum Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount		37.9
Federal Alternative Minimum Tax Credit Carryforward [Member] \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount		$ 13.4
2003
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.1
2003 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2003 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2004
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.1
2004 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2004 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2005
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.1
2005 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2005 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2006
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.1
2006 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2006 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2007
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.1
2007 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2007 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2008
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	27.4
2008 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.5
2008 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	26.6
2009
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	47.7
2009 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.2
2009 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	47.3
2010
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	18.3
2010 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2010 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	18.2
2011
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.3
2011 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	0.0
2011 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.2
2012
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	12.8
2012 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	2.0
2012 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.7
2013
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.3
2013 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	11.3
2013 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	12.9
2014
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.1
2014 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.7
2014 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.0
2015
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	24.7
2015 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	10.9
2015 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	13.2
2016
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	27.1
2016 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	11.0
2016 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	12.4
2017
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	43.9
2017 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	35.1
2017 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	8.2
2018
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	43.9
2018 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	36.3
2018 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	7.5
2019
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	37.7
2019 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	30.9
2019 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	6.7
2020
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	33.9
2020 \| Evergy Kansas Central
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	27.6
2020 \| Evergy Metro
Tax Credit Carryforward [Line Items]
Tax credit carryforward, amount	$ 6.0