View:

Download DOC

Download PDF

Download XLS

Table of Contents

Filed Pursuant to Rule 424(b)(5)
Registration No. 333-202692-01

This preliminary prospectus supplement relates to an effective registration statement under the Securities Act of 1933, as amended, but is not complete and may be changed. This preliminary prospectus supplement and the accompanying prospectus are not offers to sell these securities and are not soliciting an offer to buy these securities in any jurisdiction where the offer or sale is not permitted.

Subject to Completion

Preliminary Prospectus Supplement dated February 26, 2018

PRELIMINARY PROSPECTUS SUPPLEMENT

(To Prospectus dated September 27, 2016)

$                

Kansas City Power & Light Company

% Notes due

Kansas City Power & Light Company is offering $        aggregate principal amount of        % Notes due        (the “Notes”). The per annum interest rate on the Notes will be         %. Interest on the Notes will be payable semi-annually in arrears on          and          of each year, beginning on             , 2018. The Notes will mature on         . The Notes may be redeemed at any time in whole or from time to time in part at the applicable redemption price specified in this prospectus supplement.

The Notes will be issued in minimum denominations of $2,000 and integral multiples of $1,000 in excess thereof.    The Notes will be senior unsecured obligations of Kansas City Power & Light Company exclusively and will rank equally with any existing and future senior unsecured indebtedness of Kansas City Power & Light Company. The Notes will not be listed on any securities exchange or included in any automated dealer quotation system. Currently, there is no public market for the Notes.

Investing in the Notes involves risks that are described in the sections entitled “Risk Factors” beginning on page S-9 of this prospectus supplement and page 5 of the accompanying prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The Notes will be ready for delivery in book-entry form only through the facilities of The Depository Trust Company for the accounts of its participants, including Clearstream Banking, S.A. and Euroclear Bank S.A./N.V., as operator of the Euroclear System, on or about March        , 2018.

Joint Book-Running Managers

Co-Managers

Prospectus Supplement dated February     , 2018

Table of Contents

TABLE OF CONTENTS

Prospectus Supplement

Prospectus

S-i

Table of Contents

ABOUT THIS PROSPECTUS SUPPLEMENT

This document is in two parts. The first part is this prospectus supplement, which describes the terms of this offering. The second part is the accompanying prospectus dated September 27, 2016, which we refer to as the “accompanying prospectus.” The accompanying prospectus contains a description of the securities we may offer under the registration statement of which this prospectus supplement and the accompanying prospectus form a part and gives more general information, some of which may not apply to the Notes offered hereby.

This prospectus supplement, the accompanying prospectus and any free writing prospectus that we file with the Securities and Exchange Commission (the “SEC”) contain and incorporate by reference information that you should consider when making your investment decision. We have not, and the underwriters have not, authorized anyone to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus supplement, the accompanying prospectus and the documents incorporated by reference is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed materially since those dates.

Before you invest in the Notes, you should carefully read the registration statement (including the exhibits thereto) of which this prospectus supplement and the accompanying prospectus form a part, this prospectus supplement, the accompanying prospectus and the documents incorporated by reference into this prospectus supplement and the accompanying prospectus. The incorporated documents are described in this prospectus supplement under “Where You Can Find More Information.”

As described in more detail under “Where You Can Find More Information,” we and our parent company, Great Plains Energy Incorporated (“Great Plains Energy”), separately file combined annual, quarterly and current reports. However, only the information related to KCP&L and its consolidated subsidiaries is incorporated by reference in this prospectus supplement and the accompanying prospectus. You should not rely on any information relating solely to Great Plains Energy or its subsidiaries (other than KCP&L and its consolidated subsidiaries or information provided separately by KCP&L or the subsidiaries of KCP&L) in determining whether to invest in the Notes. The Notes are not guaranteed by Great Plains Energy or any of its or our subsidiaries. None of those entities has any obligation to make any capital contribution or distributions or to advance funds to us for the purpose of paying the principal of, or premium, if any, or interest on, the Notes or any other amount that may be required to be paid under the Indenture (as defined herein) or the Notes, preventing or curing an event of default under the terms of the Indenture, complying with any other obligation under the Indenture or the Notes or otherwise.

Unless the context otherwise requires or as otherwise indicated, when we refer to “Kansas City Power & Light,” “KCP&L,” the “Company,” “we,” “us” or “our” in this prospectus supplement or the accompanying prospectus or when we otherwise refer to ourselves herein or therein, we mean Kansas City Power & Light Company and not any of its subsidiaries or other affiliates, unless the context clearly indicates otherwise.

CAUTIONARY STATEMENTS REGARDING CERTAIN FORWARD-LOOKING INFORMATION

This prospectus supplement, the accompanying prospectus and the documents incorporated or deemed incorporated by reference as described under the heading “Where You Can Find More Information” contain forward-looking statements that are not based on historical facts. In some cases, you can identify forward-looking statements by use of the words “may,” “should,” “expect,” “plan,” “anticipate,” “estimate,” “predict,” “potential” or “continue.” Forward-looking statements include, but are not limited to, statements regarding the outcome of regulatory proceedings, cost estimates of capital projects and other matters affecting future operations. These forward-looking statements are based on assumptions, expectations, and assessments made by our management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. Any forward-looking statements are not guarantees of our future performance and are subject to risks and uncertainties, including those discussed under the heading “Risk Factors” in this prospectus supplement and in our other filings with the SEC. These risks and

S-1

Table of Contents

uncertainties could cause actual results, developments and business decisions to differ materially from those contemplated or implied by forward-looking statements. Consequently, you should recognize these statements for what they are and we caution you not to rely upon them as facts. We claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 for all forward-looking statements. We disclaim any duty to update the forward-looking statements, which apply only as of the date of this prospectus supplement. Some of the factors that may cause actual results, developments and business decisions to differ materially from those contemplated by these forward-looking statements include the following:

S-2

Table of Contents

This list of factors is not all-inclusive because it is not possible to predict all factors.

In addition, actual results may differ materially from those contemplated in any forward-looking statement due to the other risk factors discussed under Item 1A of Part I of our Annual Report on Form 10-K for the year ended December 31, 2017, which is incorporated by reference herein.

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports and other information with the SEC through the SEC’s Electronic Data Gathering, Analysis and Retrieval system and these filings are publicly available through the SEC’s website (http://www.sec.gov). You may read and copy such material at the SEC’s Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. You may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330.

The SEC allows us to “incorporate by reference” into this prospectus supplement the information we file with it. This means that we can disclose important information to you by referring you to the documents containing the information. The information we incorporate by reference is considered to be included in and an important part of this prospectus supplement and should be read with the same care. Information that we file later with the SEC that is incorporated by reference into this prospectus supplement will automatically update and supersede this information. We are incorporating by reference into this prospectus supplement the following documents that we have filed with the SEC and any subsequent filings we make with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) (excluding information deemed to be furnished and not filed with the SEC), until this offering of the Notes is completed:

We and our parent company, Great Plains Energy, separately filed the combined Annual Report on Form 10-K and the Current Reports on Form 8-K listed above. However, the information contained in those combined reports relating solely to our parent and its subsidiaries (other than KCP&L and its consolidated subsidiaries), including KCP&L Greater Missouri Operations Company, was separately filed by Great Plains Energy on its behalf, and the information contained in those combined reports relating solely to KCP&L and its consolidated subsidiaries was separately filed by us. We do not intend to incorporate by reference into this prospectus supplement the information relating to Great Plains Energy and its subsidiaries (other than KCP&L and its consolidated subsidiaries or information provided separately by KCP&L or its consolidated subsidiaries), and we make no representation as to the information relating to Great Plains Energy and its subsidiaries (other than KCP&L and its consolidated subsidiaries) contained in such combined reports. The only information you should rely upon in determining whether to invest in the Notes is the information of KCP&L and its consolidated subsidiaries contained in this prospectus supplement and the accompanying prospectus, the information separately provided by KCP&L and its consolidated subsidiaries in the documents incorporated by reference herein and therein and any free writing prospectus used in connection with the offering of Notes described in this prospectus supplement and the accompanying prospectus.

Our website is www.kcpl.com. Information contained on our website is not incorporated herein. We make available, free of charge, on or through the Investor Relations tab on our website, our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, and amendments to those reports, filed or furnished pursuant to Section 13(a) or 15(d) of the Exchange Act as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. In addition, we make available on or through

S-3

Table of Contents

our website all other reports, notifications and certifications filed electronically with the SEC. You may obtain a free copy of our filings with the SEC by writing or telephoning us at the following address: Kansas City Power & Light Company, 1200 Main Street, Kansas City, Missouri 64105 (Telephone No.: (816) 556-2200), Attention: Corporate Secretary, or by contacting us on our website.

S-4

Table of Contents

S-5

Table of Contents

S-6

Table of Contents

S-7

Table of Contents

S-8

Table of Contents

RISK FACTORS

An investment in the Notes is subject to various risks. These risks should be considered carefully with the information provided elsewhere and incorporated by reference in this prospectus supplement and the accompanying prospectus before deciding to invest in the Notes. In addition to the risk factors set forth below,, please read the information included or incorporated by reference under “Risk Factors” and “Cautionary Statements Regarding Certain Forward-Looking Information” in this prospectus supplement and our Annual Report on Form 10-K for the year ended December 31, 2017 for a description of additional uncertainties associated with our business, results of operations and financial condition and the forward-looking statements included or incorporated by reference in this prospectus supplement and the accompanying prospectus. As used in this section, “we,” “our,” “us” and the “Company” refer to Kansas City Power & Light Company and not to any of its subsidiaries.

Indebtedness — Our indebtedness could adversely affect our ability to fulfill our obligations under the Notes.

Our consolidated indebtedness and debt service obligations are significant. Our consolidated interest expense was $138.8 million for the year ended December 31, 2017. As of December 31, 2017, our total consolidated long-term debt, including current maturities, was $2.6 billion, excluding unused commitments and contractual obligations and other commitments, and our total shareholder’s equity was $2.5 billion. We may incur additional short-term and long-term debt from time to time to finance our construction requirements, pension benefit plan funding requirements, dividends to our parent company, working capital or capital expenditures or for other general corporate purposes, subject to the restrictions contained in the credit agreement that governs our senior unsecured revolving credit facility and in any other agreements under which we incur debt.

The Indenture does not limit the amount of secured or unsecured debt that we may incur. As described more fully under “Description of Notes – Ranking” in the accompanying prospectus, pursuant to insurance policies and related agreements with respect to two series of our tax-exempt bonds, we have agreed with the issuer of such insurance policies to not issue additional mortgage bonds without the insurer’s consent if, after giving effect to such additional mortgage bonds, the proportion of secured debt to total indebtedness exceeded certain thresholds. In September 2015, we repurchased these tax-exempt bonds and they are currently held by us.

The covenants contained in the Indenture do not afford the holders of Notes any protection in the event of a highly leveraged transaction or other transaction involving us that may adversely affect holders.

Our debt could have important consequences to holders of the Notes, including the following:

S-9

Table of Contents

Unsecured Obligations — Because the Notes are not secured and are effectively subordinated to the rights of secured creditors, the Notes will be subject to the prior claims of any secured creditors, and if a default occurs, we may not have sufficient funds to fulfill our obligations under the Notes.

The Notes are senior unsecured obligations and will rank equally with any future unsecured and unsubordinated debt and will be effectively junior to our existing secured debt and any future secured debt we may incur. The Indenture does not limit the amount of unsecured debt that we may incur or restrict us from entering into sale and leaseback transactions. In general, the Indenture also does not limit the amount of secured debt that we may incur. As of December 31, 2017, KCP&L had outstanding $479.5 million of secured indebtedness (which amount does not include certain secured tax-exempt bonds previously issued for our benefit that we repurchased in September 2015 and are currently held by us).

Our assets and those of our subsidiaries which secure our existing or future secured debt will be subject to prior claims by our and their respective secured creditors. In the event of our bankruptcy, insolvency, liquidation, reorganization, dissolution or other winding up, assets that secure debt will be available to pay obligations on the Notes only after all debt secured by those assets has been repaid in full. Holders of the Notes will participate in any remaining assets ratably with all of our unsecured and unsubordinated creditors, including trade creditors. If we incur any additional obligations that rank equally with the Notes, including trade payables, the holders of those obligations will be entitled to share ratably with the holders of the Notes in any proceeds distributed upon our bankruptcy, insolvency, liquidation, reorganization, dissolution or other winding up. This may have the effect of reducing the amount of proceeds paid to holders of the Notes. If there are not sufficient assets remaining to pay all these creditors, all or a portion of the Notes then outstanding would remain unpaid.

No Guarantees — Our parent company is not guaranteeing the Notes and you should not rely upon information relating to our parent company in determining whether to invest in the Notes.

As described in more detail under “Where You Can Find More Information,” we and our parent company, Great Plains Energy, separately file combined annual, quarterly and current reports. However, only the information related to KCP&L and its consolidated subsidiaries is incorporated by reference in this prospectus supplement and the accompanying prospectus. You should not rely on any information relating solely to Great Plains Energy or its subsidiaries (other than KCP&L and its subsidiaries or information provided separately by KCP&L or the subsidiaries of KCP&L) in determining whether to invest in the Notes. The Notes are not guaranteed by Great Plains Energy or any of its or our subsidiaries. None of those entities has any obligation to make any capital contribution or distributions or to advance funds to us for the purpose of paying the principal of, or premium, if any, or interest on, the Notes or any other amount that may be required to be paid under the Indenture or the Notes, preventing or curing an event of default under the terms of the Indenture, complying with any other obligation under the Indenture or the Notes or otherwise.

No Prior Market for the Notes — There is no prior market for the Notes, and if a market develops, it may not be liquid and prices of the Notes may vary.

We do not intend to list the Notes on any securities exchange or seek their quotation on any automated dealer quotation system. We cannot assure holders of the Notes that any liquid market for the Notes will ever develop or be maintained. The underwriters have advised us that they currently intend to make a market in the Notes following this offering. However, the underwriters have no obligation to make a market in the Notes and they may stop at any time. Further, there can be no assurance as to the liquidity of any market that may develop for the Notes, holders’ ability to sell their Notes or the price at which holders will be able to sell their Notes. Future trading prices of the Notes will depend on many factors, including prevailing interest rates, our financial condition and results of operations, the then-current ratings assigned to the Notes and the market for similar securities. Any trading market that develops would be affected by many factors independent of, and in addition to, the foregoing, including:

S-10

Table of Contents

KCP&L and certain of its securities are rated by Moody’s Investors Service, Inc. and S&P Global Ratings. There is no assurance that such credit ratings will be issued or remain in effect for any given period of time or that such ratings will not be decreased, suspended or withdrawn entirely by the rating agencies, if, in each rating agency’s judgment, circumstances so warrant. KCP&L’s credit ratings could decrease as a result of events directly affecting Great Plains Energy and its subsidiaries (other than KCP&L and its subsidiaries), even though Great Plains Energy is not guaranteeing the Notes and is not generally obligated to provide credit support to us. Holders of Notes will have no recourse against us or any other parties in the event of a change in or suspension or withdrawal of such ratings. Any decrease, suspension or withdrawal of such ratings may have an adverse effect on the market price or marketability of debt securities issued by us, including the Notes.

RATIO OF EARNINGS TO FIXED CHARGES

The following table shows our ratio of earnings to fixed charges for the periods indicated:

For purposes of computing the ratio of earnings to fixed charges: (i) earnings consist of income before deducting net provisions for income taxes and fixed charges; and (ii) fixed charges consist of interest on debt amortization of debt discount, premium and expense, and the estimated interest component of lease payments and rentals.

S-11

Table of Contents

USE OF PROCEEDS

The net proceeds from this offering, after deducting the underwriting discount and estimated expenses of this offering, are expected to be approximately $                . We intend to use the net proceeds of this offering to repay at maturity $350 million aggregate principal amount of our outstanding 6.375% Notes due 2018.

S-12

Table of Contents

DESCRIPTION OF THE NOTES

The following description of the particular terms of the Notes supplements and, to the extent inconsistent therewith, replaces the description of the general terms and provisions of the Notes set forth in the accompanying prospectus under “Description of Notes,” to which reference is hereby made. Whenever a defined term is referred to and not herein defined, the definition thereof is contained in the accompanying prospectus or in the Indenture. As used in this section, the terms “we,” “us,” “our” and “KCP&L” refer to Kansas City Power & Light Company only and not to its subsidiaries or other affiliates.

The following description, together with the “Description of Notes” in the accompanying prospectus, is a summary of the material provisions of the Notes and the Indenture and does not purport to be complete. This summary is subject to and is qualified by reference to all the provisions of the Notes and the Indenture, including the definition of certain terms used in the Indenture. We urge you to read the Indenture because it, and not this description, defines your rights as a holder of the Notes.

General

The Notes constitute a single series of debt securities to be issued pursuant to an indenture, dated as of May 1, 2007, between the Company and The Bank of New York Mellon Trust Company, N.A. (formerly The Bank of New York Trust Company, N.A.), as Trustee (the “Trustee”), as to be supplemented by a supplemental indenture establishing the terms of the Notes (as so supplemented, the “Indenture”). The terms of the Notes include those expressly set forth in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended. The Notes will initially be limited to $                  aggregate principal amount and will mature on                 .

The Notes will bear interest at the rate per annum set forth on the cover page of this prospectus supplement from the date of issuance or from the most recent interest payment date to which interest has been paid or provided for, payable semi-annually in arrears on                  and                  of each year, beginning on                 , 2018, to the persons in whose names the Notes are registered at the close of business on the fifteenth calendar day prior to such interest payment date, whether or not such day is a Business Day. Interest will be computed on the basis of a 360-day year comprised of twelve 30-day months (and for any partial periods shall be calculated on the basis of the number of days elapsed in a 360-day year of twelve 30-day months). If any date on which interest is payable on the Notes is not a Business Day, then payment of the interest payable on that date will be made on the next succeeding day which is a Business Day (and without any additional interest or other payment in respect of any delay).

As used in this section, “Business Day” means, with respect to the Notes, any day other than a day on which banking institutions in New York, New York are authorized or required by law to close.

The Notes will be direct unsecured obligations of KCP&L exclusively, and not the obligation of any of our subsidiaries or affiliates. The Notes will (i) rank equally with our existing and future senior unsecured indebtedness, (ii) be effectively subordinated (with respect to underlying collateral) to any secured indebtedness now outstanding or that we may incur in the future, and (iii) be structurally subordinated to all indebtedness of our subsidiaries.

The Notes will be issued only in registered form in minimum denominations of $2,000 and in integral multiples of $1,000 in excess thereof.

We will initially offer $                 aggregate principal amount of the Notes. Subject to the terms of the Indenture, we may, at any time, without consent of the holders of the Notes, issue additional notes ranking equally and ratably with, and having the same interest rate, maturity and other terms (except for the price to public, the issue date and the first interest payment date, as applicable), as the Notes being offered hereby. Any additional notes, together with the Notes offered hereby, will constitute a single series of notes under the Indenture; provided that if any such additional notes are not fungible for U.S. federal income tax purposes with the Notes offered hereby, such additional notes will be issued under a separate CUSIP number.

S-13

Table of Contents

Optional Redemption

We will have the right to redeem the Notes at any time prior to                 (the date that is                  months prior to the maturity date of the Notes (the “Par Call Date”)), in whole or from time to time in part, at our option, at a redemption price equal to the greater of:

plus, in each case, accrued and unpaid interest on the principal amount of the Notes being redeemed to, but excluding, the redemption date. Notwithstanding the foregoing, installments of interest on Notes that are due and payable on interest payment dates falling on or prior to a redemption date will be payable on the interest payment date to the registered holders as of the close of business on the relevant record date according to the Notes and the Indenture.

We will have the right to redeem the Notes, at any time on or after the Par Call Date, in whole or from time to time in part, at our option, at a redemption price equal to 100% of the principal amount of the Notes being redeemed plus accrued and unpaid interest on the principal amount of the Notes being redeemed to, but excluding, the redemption date.

“Comparable Treasury Issue” means the United States Treasury security selected by the Quotation Agent as having a maturity comparable to the remaining term of the Notes to be redeemed (assuming, for this purpose, that the Notes matured on the Par Call Date) that would be utilized, at the time of selection and in accordance with customary financial practice, in pricing new issues of corporate debt securities of comparable maturity to the remaining term of the Notes.

“Comparable Treasury Price” means, with respect to any redemption date:

“Quotation Agent” means the Reference Treasury Dealer appointed by us.

“Reference Treasury Dealer” means:

“Reference Treasury Dealer Quotations” means, with respect to each Reference Treasury Dealer and any redemption date, the average, as determined by the Quotation Agent, of the bid and asked prices for the Comparable Treasury Issue (expressed in each case as a percentage of its principal amount) quoted in writing to the Quotation Agent by such Reference Treasury Dealer at 5:00 p.m., New York City time, on the third Business Day preceding such redemption date.

S-14

Table of Contents

“Treasury Rate” means, with respect to any redemption date, the rate per annum equal to the semi-annual equivalent yield to maturity of the Comparable Treasury Issue, assuming a price for the Comparable Treasury Issue (expressed as a percentage of its principal amount) equal to the Comparable Treasury Price for such redemption date.

Notice of any redemption will be given at least 10 days but not more than 60 days before the redemption date to each holder of the Notes to be redeemed. Unless we default in payment of the redemption price, on and after the redemption date, interest will cease to accrue on the Notes or portions thereof called for redemption. If less than all of the Notes are to be redeemed, the particular Notes or portions of such Notes to be redeemed will be selected by DTC in such manner as it shall determine.

Notwithstanding the foregoing, any notice of redemption at our option may state that such redemption will be conditional upon receipt by the Trustee on or prior to the date fixed for such redemption, of money sufficient to pay the principal of, and premium, if any, and interest on, such Notes and that if such money has not been so received, such notice will be of no force and effect and we will not be required to redeem such Notes.

No Guarantees

The Notes are not guaranteed by our parent company, Great Plains Energy, or any of its or our subsidiaries. None of those entities has any obligation to make any capital contribution or distributions or to advance funds to KCP&L for the purpose of paying the principal of, or premium, if any, or interest on, the Notes or any other amount that may be required to be paid under the Indenture or the Notes, preventing or curing an event of default under the terms of the Indenture or complying with any other obligation under the Indenture or the Notes or otherwise.

Book-Entry System

Upon issuance, the Notes will be represented by one or more global securities deposited with, or on behalf of, DTC, as depositary. The global securities representing the Notes will be registered in the name of the depositary or its nominee. Except under the circumstances described in the accompanying prospectus under “Book-Entry System,” the Notes will not be issuable in definitive form. So long as the Notes are represented by one or more global securities, the depositary or its nominee will be considered the sole owner or holder of such Notes for all purposes under the Indenture, and the beneficial owners of such Notes will be entitled only to those rights and benefits afforded to them in accordance with the depositary’s regular operating procedures. The depositary has confirmed to us, the underwriters and the Trustee that it intends to follow such procedures with respect to the Notes. A further description of the depositary’s procedures with respect to global securities is set forth in the accompanying prospectus under “Book-Entry System.”

Global Clearance and Settlement Procedures

Secondary market trading between Clearstream Banking, S.A. (“Clearstream”) participants and/or Euroclear Bank S.A./N.V., as operator of the Euroclear System (“Euroclear”) participants will occur in the ordinary way in accordance with the applicable rules and operating procedures of Clearstream and Euroclear, as applicable.

Cross-market transfers between persons holding directly or indirectly through DTC on the one hand, and directly or indirectly through Clearstream participants or Euroclear participants on the other, will be effected through DTC in accordance with DTC rules on behalf of the relevant European international clearing system by its U.S. depositary; however, such cross-market transactions will require delivery of instructions to the relevant European international clearing system by the counterparty in such system in accordance with its rules and procedures and within its established deadlines (European time). The relevant European international clearing system will, if the transaction meets its settlement requirements, deliver instructions to its U.S. depositary to take action to effect final settlement on its behalf by delivering or receiving securities in DTC, and making or receiving payment in accordance with normal procedures for same-day funds settlement applicable to DTC. Clearstream participants and Euroclear participants may not deliver instructions directly to their respective U.S. depositaries.

S-15

Table of Contents

Because of time-zone differences, credits of Notes received in Clearstream or Euroclear as a result of a transaction with a DTC participant will be made during subsequent securities settlement processing and dated the business day following the DTC settlement date. Such credits or any transactions in such Notes settled during such processing will be reported to the relevant Euroclear participant or Clearstream participant on such business day. Cash received in Clearstream or Euroclear as a result of sales of the Notes by or through a Clearstream participant or a Euroclear participant to a DTC participant will be received with value on the DTC settlement date but will be available in the relevant Clearstream or Euroclear cash account only as of the business day following settlement in DTC.

S-16

Table of Contents

MATERIAL U.S. FEDERAL INCOME TAX CONSIDERATIONS

The following discussion summarizes certain material U.S. federal income tax considerations that may be relevant to the purchase, ownership and disposition of the Notes. Because this section is a summary, it does not address all aspects of taxation that may be relevant to a particular holder of the Notes in light of the holder’s personal investment or tax circumstances, or to certain types of holders that are subject to special treatment under the U.S. federal income tax laws, such as:

This summary assumes that the Notes are held as capital assets for U.S. federal income tax purposes, which generally means property held for investment. In addition, except where otherwise provided, this discussion is limited to the U.S. federal income tax consequences to initial investors that purchase the Notes for cash, at their original issue price, and does not discuss the tax consequences for subsequent purchasers of the Notes. It does not consider any tax consequences arising out of U.S. federal gift, generation-skipping and estate tax law or under the tax laws of any foreign, state, local or other jurisdiction.

If a partnership, including any entity or arrangement that is treated as a partnership for U.S. federal income tax purposes, is a beneficial owner of Notes, the treatment of a partner in the partnership will generally depend on the status of the partner and the activities of the partnership. If you are a partnership that is considering purchasing Notes (or a partner in such partnership), you should consult with your tax advisor.

This discussion is based upon the Internal Revenue Code of 1986, as amended (the “Code”), applicable Treasury Regulations promulgated thereunder, judicial authority and administrative interpretations as of the date hereof, all of which are subject to change, possibly with retroactive effect. There can be no assurance that the Internal Revenue Service (the “IRS”) will not challenge one or more of the tax consequences described herein and we have not obtained, nor do we intend to obtain, a ruling from the IRS with respect to the U.S. federal income tax consequences of the purchase, ownership and disposition of the Notes.

We urge you to consult your own tax advisor about the particular U.S. federal, state, local and foreign tax consequences of the purchase, ownership and disposition of the Notes and the application of the U.S. federal income tax laws to your particular situation.

S-17

Table of Contents

U.S. Holders

A “U.S. holder” is a beneficial owner of Notes that, for U.S. federal income tax purposes, is:

Interest

If the Notes are issued at a discount from their stated redemption price at maturity, it is expected, and this discussion assumes, that any such discount will be less than the statutorily defined de minimis amount. Accordingly, stated interest on the Notes generally will be taxable to a U.S. holder as ordinary interest income at the time such interest is received or accrued in accordance with the U.S. holder’s regular method of accounting for U.S. federal income tax purposes.

Sale, Exchange or Other Taxable Disposition of Notes

A U.S. holder will generally recognize taxable gain or loss on the sale, exchange, redemption, retirement or other taxable disposition of a Note. The amount of the U.S. holder’s gain or loss will equal the difference between the amount the U.S. holder receives for the Note (except to the extent such amount represents accrued but unpaid interest, which will be treated as ordinary interest income to the extent the U.S. holder has not previously included the accrued interest in gross income) minus the U.S. holder’s adjusted tax basis in the Note. The U.S. holder’s adjusted tax basis in a Note generally will be the price the U.S. holder paid for the Note. Any such gain or loss on a taxable disposition of a Note, as described above, will generally constitute capital gain or loss and will be long-term capital gain or loss if the U.S. holder has held such Note for more than one year at the time of disposition. Under current U.S. federal income tax law, net long-term capital gains of non-corporate U.S. holders (including individuals) are eligible for taxation at preferential rates. The deductibility of capital losses against ordinary income is subject to limitations.

Net Investment Income Tax

Certain U.S. holders who are individuals, estates or trusts are subject to a 3.8% tax on all or a portion of their “net investment income,” which generally will include interest and gain on a sale in respect of the Notes, subject to certain exceptions. Each U.S. holder is urged to consult its tax advisors regarding the applicability of the net investment income tax to its income and gains in respect of its investment in the Notes.

Information Reporting and Backup Withholding

Payments of principal and interest made by us on, or the proceeds of the sale or other disposition of, the Notes generally will be subject to information reporting unless the U.S. holder is an exempt recipient, such as a corporation, and, if required, demonstrates its status as an exempt recipient. In addition, such payments generally will be subject to U.S. federal backup withholding tax, currently at a rate of 24%, unless the U.S. holder supplies a taxpayer identification number, certified under penalties of perjury, as well as certain other information, or otherwise establishes an exemption from backup withholding. Backup withholding is not an additional tax. The amount of any backup withholding from a payment to a U.S. holder will be allowed as a credit against the U.S. holder’s U.S. federal income tax liability and may entitle the U.S. holder to a refund, provided that the required information is timely furnished to the IRS.

Non-U.S. Holders

A “Non-U.S. holder” is a beneficial owner of Notes that is neither a partnership nor other pass-through entity or arrangement that is treated as a partnership for U.S. federal income tax purposes (which, as indicated above, we do not address herein) or a U.S. holder.

S-18

Table of Contents

Payments on the Notes

Subject to the discussions below concerning backup withholding and FATCA withholding, payments of interest on a Note to any Non-U.S. holder will generally not be subject to U.S. federal withholding tax, provided that the interest is not effectively connected with a U.S. trade or business conducted by the Non-U.S. holder and:

we, or our paying agent, receive:

Special rules may apply to holders who hold Notes through “qualified intermediaries” within the meaning of U.S. federal income tax laws.

If interest on a Note is effectively connected with the conduct by a Non-U.S. holder of a trade or business in the United States and, if the Non-U.S. holder is entitled to the benefits under an applicable tax treaty, is attributable to a permanent establishment or a fixed base in the United States, then such income generally will be subject to U.S. federal income tax on a net basis at the rates applicable to U.S. persons generally (and, if realized by corporate Non-U.S. holders, may also be subject to a branch profits tax at 30% or such lower rate as may be available pursuant to an applicable income tax treaty). If interest is subject to U.S. federal income tax on a net basis in accordance with the rules described in the preceding sentence, payments of such interest will not be subject to U.S. federal withholding tax so long as the holder provides us or the paying agent with a properly completed IRS Form W-8ECI.

A Non-U.S. holder that does not qualify for an exemption from withholding under the preceding paragraphs generally will be subject to withholding of U.S. federal income tax at the rate of 30% (or lower, including a 0%, applicable treaty rate if the Non-U.S. holder qualifies for such applicable treaty benefit and certifies such qualification via a Form W-8BEN or W-8BEN-E) on payments of interest on the Notes. We will not be obligated to make any “gross up” or additional payments in respect of amounts withheld on the Notes if we determine that we must so withhold in respect of the amounts described above.

Non-U.S. holders may be required to periodically update their IRS forms.

Non-U.S. holders should consult their tax advisors concerning certification requirements and about any applicable income tax treaties, which may provide for an exemption from or a lower rate of withholding tax, exemption from or reduction of branch profits tax, or other rules different from those described above.

S-19

Table of Contents

Sale, Exchange or Other Taxable Disposition of Notes

Subject to the discussions of backup withholding and FATCA withholding below, any gain realized by a Non-U.S. holder on the sale, exchange, redemption, retirement or other disposition of a Note generally will not be subject to U.S. federal income tax, unless:

If the first bullet point applies, the Non-U.S. holder generally will be subject to U.S. federal income tax with respect to such gain in the same manner as U.S. holders, as described above, unless an applicable income tax treaty provides otherwise. In addition, if such Non-U.S. holder is a corporation, such Non-U.S. holder may also be subject to the branch profits tax described above. If the second bullet point applies, the Non-U.S. holder generally will be subject to U.S. federal income tax at a rate of 30% (or at a reduced rate under an applicable income tax treaty) on the amount by which capital gains from U.S. sources (including gains from the sale, exchange, redemption, retirement or other disposition of the Notes) exceed capital losses allocable to U.S. sources.

Gain realized on a disposition of a Note will not include amounts that represent accrued but unpaid interest, which will be treated as described under “—Payments on the Notes.”

Information Reporting and Backup Withholding

Payments of interest to a Non-U.S. holder generally will be reported to the IRS and to the Non-U.S. holder. Copies of applicable IRS information returns may be made available under the provisions of a specific tax treaty or agreement to the tax authorities of the country in which the Non-U.S. holder resides. Non-U.S. holders are generally exempt from backup withholding, currently at a rate of 24%, and additional information reporting on payments of principal, premium (if any), or interest on a Note and the payment of proceeds from the sale of a Note, provided that the Non-U.S. holder (a) certifies its nonresident status on the appropriate IRS form (or a suitable substitute form) and certain other conditions are met or (b) otherwise establishes an exemption. Backup withholding is not an additional tax. Any backup withholding generally will be allowed as a credit or refund against the Non-U.S. holder’s U.S. federal income tax liability provided that the required information is timely furnished to the IRS.

FATCA Withholding

Under the Foreign Account Tax Compliance Act provisions of the Code and related U.S. Treasury guidance (“FATCA”), a U.S. federal withholding tax of 30% will be imposed in certain circumstances on payments of (i) interest on the Notes and (ii) the gross proceeds (including the return of principal) from the disposition, including a redemption or retirement, of the Notes occurring on or after January 1, 2019. In the case of payments made to a “foreign financial institution” (such as a bank, a broker, an investment fund or, in certain cases, a holding company), as a beneficial owner or as an intermediary, this tax generally will be imposed, subject to certain exceptions, unless such institution (i) has agreed to (and does) comply with the requirements of an agreement with the United States (an “FFI Agreement”) or (ii) is required by (and does comply with) applicable foreign law enacted in connection with an intergovernmental agreement between the United States and a foreign jurisdiction (an “IGA”) to, among other things, collect and provide to the U.S. tax authorities or other relevant tax authorities certain information regarding U.S. account holders of such institution and, in either case, such institution provides the withholding agent with a certification as to its FATCA status. In the case of payments made to a foreign entity that is not a financial institution (as a beneficial owner), the tax generally will be imposed, subject to certain exceptions, unless such entity provides the withholding agent with a certification as to its FATCA status and, in certain cases, identifies any “substantial” U.S. owner (generally, any specified U.S. person that directly or indirectly owns more than a specified percentage of such entity). If a Note is held through

S-20

Table of Contents

a foreign financial institution that has agreed to comply with the requirements of an FFI Agreement or is subject to similar requirements under applicable foreign law enacted in connection with an IGA, such foreign financial institution (or, in certain cases, a person paying amounts to such foreign financial institution) generally will be required, subject to certain exceptions, to withhold tax on payments made to (i) a person (including an individual) that fails to provide any required information or documentation or (ii) a foreign financial institution that has not agreed to comply with the requirements of an FFI Agreement and is not subject to similar requirements under applicable foreign law enacted in connection with an IGA. We will not be obligated to make any “gross up” or additional payments in respect of amounts withheld on the Notes if we determine that we must so withhold in order to comply with FATCA in respect of the amounts described above. Prospective purchasers of the Notes should consult their own tax advisors regarding the application of FATCA to the purchase, ownership and disposition of Notes in their particular circumstances.

S-21

Table of Contents

UNDERWRITING

Subject to the terms and conditions contained in an underwriting agreement, dated the date of this prospectus supplement between us and the underwriters named below, for whom J.P. Morgan Securities LLC, Merrill Lynch, Pierce, Fenner & Smith Incorporated, MUFG Securities Americas Inc. and Wells Fargo Securities, LLC are acting as representatives, we have agreed to sell to each underwriter, and each underwriter has severally agreed to purchase from us, the principal amount of Notes that appears opposite its name in the table below:

The underwriters are offering the Notes subject to their acceptance of the Notes from us and subject to prior sale. The underwriting agreement provides that the obligations of the several underwriters to pay for and accept delivery of the Notes offered hereby are subject to certain conditions. The underwriting agreement provides that the underwriters are obligated to purchase all of the Notes, if any are purchased.

The Notes sold by the underwriters to the public will initially be offered at the initial price to the public set forth on the cover page of this prospectus supplement and may be offered to certain dealers at this price less a concession not in excess of                % of the aggregate principal amount of the Notes. The underwriters may allow, and those dealers may reallow, a discount not in excess of                % of the aggregate principal amount of the Notes to certain other dealers. If the Notes are not sold at the initial price to the public, the underwriters may change the price to the public and the other selling terms. The underwriters may offer and sell Notes through certain of their affiliates.

The following table shows the underwriting discount that we will pay to the underwriters in connection with the offering of the Notes:

Expenses associated with this offering to be paid by us, other than the underwriting discount, are estimated to be approximately $                     .

We have also agreed to indemnify the several underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended, or to contribute to payments which the underwriters may be required to make in respect of any such liabilities.

The Notes are a new issue of securities with no established trading market. We do not intend to list the Notes on any securities exchange or seek their quotation on any automated dealer quotation system. The underwriters have advised us that they intend to make a market in the Notes, but they are not obligated to do so. At their sole discretion, the underwriters may discontinue any market making in the Notes at any time without notice. Accordingly, we cannot assure you that a liquid trading market will develop for the Notes, that you will be able to sell your Notes at a particular time or that the price you receive when you sell will be favorable.

In connection with the offering of the Notes, the underwriters may engage in transactions that stabilize, maintain or otherwise affect the prices of the Notes. Specifically, the underwriters may overallot in connection

S-22

Table of Contents

with the offering of the Notes, creating syndicate short positions. In addition, the underwriters may bid for and purchase Notes in the open market to cover syndicate short positions or to stabilize the price of the Notes. Finally, the underwriting syndicate may reclaim selling concessions allowed for distributing the Notes in this offering if the syndicate repurchases previously distributed Notes in syndicate covering transactions, stabilization transactions or otherwise. Any of these activities may stabilize or maintain the market prices of the Notes above independent market levels. The underwriters are not required to engage in any of these activities, and may end any of them at any time without notice.

Other Relationships

The underwriters and their respective affiliates are full service financial institutions engaged in various activities, which may include securities trading, commercial and investment banking, financial advisory, corporate trust, investment management, investment research, principal investment, hedging, financing and brokerage activities.

Certain of the underwriters and their affiliates have provided and in the future may continue to provide investment banking, commercial banking and other financial services, including the provision of credit facilities, to us and our affiliates in the ordinary course of business for which they have received and will receive customary compensation. Affiliates of certain of the underwriters are lenders under revolving credit agreements entered into separately with Great Plains Energy, KCP&L and GMO. In connection with these arrangements, affiliates of certain of the underwriters act as lenders. In the ordinary course of their various business activities, the underwriters and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers, and such investment and securities activities may involve our securities and/or instruments. If any of the underwriters or their affiliates has a lending relationship with us, certain of these underwriters or their affiliates routinely hedge, and certain other of these underwriters or their affiliates may hedge, their credit exposure to us consistent with their customary risk management policies. Typically, such underwriters and their affiliates would hedge such exposure by entering into transactions which consist of either the purchase of credit default swaps or the creation of short positions in our securities, including potentially the Notes offered hereby. Any such credit default swaps or short positions could adversely affect future trading prices of the Notes offered hereby. The underwriters and their respective affiliates may also make investment recommendations and/or publish or express independent research views in respect of such securities or instruments and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

T+3 Settlement Cycle

We expect that delivery of the Notes will be made against payment therefor on the third business day after the date specified on the cover page of this prospectus supplement (such settlement being referred to as ‘‘T+3’’). Pursuant to Rule 15c6-1 under the Exchange Act, trades in the secondary market generally are required to settle in two business days unless the parties to any such trade expressly agree otherwise. Accordingly, purchasers who wish to trade the Notes on the date of this prospectus supplement will be required, by virtue of the fact that the Notes initially will settle in T+3, to specify an alternative settlement cycle at the time of any such trade to prevent failed settlement. Purchasers of the Notes who wish to trade the Notes on the date of this prospectus supplement should consult their own advisors.

Selling Restrictions

Notice to Prospective Investors in Canada

The Notes may be sold only to purchasers purchasing, or deemed to be purchasing, as principal that are accredited investors, as defined in National Instrument 45-106 Prospectus Exemptions or subsection 73.3(1) of the Securities Act (Ontario), and are permitted clients, as defined in National Instrument 31-103 Registration Requirements, Exemptions and Ongoing Registrant Obligations. Any resale of the Notes must be made in accordance with an exemption from, or in a transaction not subject to, the prospectus requirements of applicable securities laws.

S-23

Table of Contents

Securities legislation in certain provinces or territories of Canada may provide a purchaser with remedies for rescission or damages if this prospectus supplement or the accompanying prospectus (including any amendment thereto) contains a misrepresentation, provided that the remedies for rescission or damages are exercised by the purchaser within the time limit prescribed by the securities legislation of the purchaser’s province or territory. The purchaser should refer to any applicable provisions of the securities legislation of the purchaser’s province or territory for particulars of these rights or consult with a legal advisor.

Pursuant to section 3A.3 of National Instrument 33-105 Underwriting Conflicts (NI 33-105), the underwriters are not required to comply with the disclosure requirements of NI 33-105 regarding underwriter conflicts of interest in connection with this offering.

Notice to Prospective Investors in the European Economic Area

The Notes are not intended to be offered, sold or otherwise made available to and should not be offered, sold or otherwise made available to any retail investor in the European Economic Area (“EEA”). For these purposes, a retail investor means a person who is one (or more) of: (i) a retail client as defined in point (11) of Article 4(1) of Directive 2014/65/EU (as amended, “MiFID II”); (ii) a customer within the meaning of Directive 2002/92/EC, where that customer would not qualify as a professional client as defined in point (10) of Article 4(1) of MiFID II; or (iii) not a qualified investor as defined in Directive 2003/71/EC (as amended, the “Prospectus Directive”). Consequently no key information document required by Regulation (EU) No 1286/2014 (as amended, the “PRIIPs Regulation”) for offering or selling the Notes or otherwise making them available to retail investors in the EEA has been prepared, and therefore offering or selling the Notes or otherwise making them available to any retail investor in the EEA may be unlawful under the PRIIPs Regulation. This prospectus supplement and the accompanying prospectus have been prepared on the basis that any offer of Notes in any Member State of the EEA will be made pursuant to an exemption under the Prospectus Directive from the requirement to publish a prospectus for offers of Notes. This prospectus supplement and the accompanying prospectus are not a prospectus for the purposes of the Prospectus Directive.

Notice to Prospective Investors in the United Kingdom

In the United Kingdom, this prospectus supplement and the accompanying prospectus is being distributed only to, and is directed only at, and any offer subsequently made may only be directed at, persons who are “qualified investors” (as defined in the Prospectus Directive) (i) who have professional experience in matters relating to investments falling within Article 19 (5) of the Financial Services and Markets Act 2000 (Financial Promotion) Order 2005, as amended (the “Order”) and/or (ii) who are high net worth companies (or persons to whom it may otherwise be lawfully communicated) falling within Article 49(2)(a) to (d) of the Order (all such persons together being referred to as “relevant persons”). This prospectus supplement and the accompanying prospectus must not be acted on or relied on in the United Kingdom by persons who are not relevant persons. In the United Kingdom, any investment or investment activity to which this prospectus supplement and the accompanying prospectus relate is only available to, and will be engaged in with, relevant persons.

Notice to Prospective Investors in Hong Kong

The Notes may not be offered or sold by means of any document other than (i) in circumstances which do not constitute an offer to the public within the meaning of the Companies Ordinance (Cap.32, Laws of Hong Kong), or (ii) to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap.571, Laws of Hong Kong) and any rules made thereunder, or (iii) in other circumstances which do not result in the document being a “prospectus” within the meaning of the Companies Ordinance (Cap.32, Laws of Hong Kong), and no advertisement, invitation or document relating to the Notes may be issued or may be in the possession of any person for the purpose of issue (in each case whether in Hong Kong or elsewhere), which is directed at, or the contents of which are likely to be accessed or read by, the public in Hong Kong (except if permitted to do so under the laws of Hong Kong) other than with respect to Notes which are or are intended to be disposed of only to persons outside Hong Kong or only to “professional investors” within the meaning of the Securities and Futures Ordinance (Cap. 571, Laws of Hong Kong) and any rules made thereunder.

S-24

Table of Contents

Notice to Prospective Investors in Japan

The Notes have not been and will not be registered under the Financial Instruments and Exchange Law of Japan (the Financial Instruments and Exchange Law) and each underwriter has agreed that it will not offer or sell any securities, directly or indirectly, in Japan or to, or for the benefit of, any resident of Japan (which term as used herein means any person resident in Japan, including any corporation or other entity organized under the laws of Japan), or to others for re-offering or resale, directly or indirectly, in Japan or to a resident of Japan, except pursuant to an exemption from the registration requirements of, and otherwise in compliance with, the Financial Instruments and Exchange Law and any other applicable laws, regulations and ministerial guidelines of Japan.

Notice to Prospective Investors in Singapore

This prospectus supplement has not been registered as a prospectus with the Monetary Authority of Singapore. Accordingly, this prospectus supplement and any other document or material in connection with the offer or sale, or invitation for subscription or purchase, of the Notes may not be circulated or distributed, nor may the Notes be offered or sold, or be made the subject of an invitation for subscription or purchase, whether directly or indirectly, to persons in Singapore other than (i) to an institutional investor under Section 274 of the Securities and Futures Act, Chapter 289 of Singapore (the “SFA”), (ii) to a relevant person, or any person pursuant to Section 275(1A), and in accordance with the conditions, specified in Section 275 of the SFA or (iii) otherwise pursuant to, and in accordance with the conditions of, any other applicable provision of the SFA.

Where the Notes are subscribed or purchased under Section 275 by a relevant person which is: (a) a corporation (which is not an accredited investor) the sole business of which is to hold investments and the entire share capital of which is owned by one or more individuals, each of whom is an accredited investor; or (b) a trust (where the trustee is not an accredited investor) whose sole purpose is to hold investments and each beneficiary is an accredited investor, shares, debentures and units of shares and debentures of that corporation or the beneficiaries’ rights and interest in that trust shall not be transferable for 6 months after that corporation or that trust has acquired the Notes under Section 275 except: (1) to an institutional investor under Section 274 of the SFA or to a relevant person, or any person pursuant to Section 275(1A), and in accordance with the conditions, specified in Section 275 of the SFA; (2) where no consideration is given for the transfer; or (3) by operation of law.

Notice to Prospective Investors in Taiwan

The Notes have not been and will not be registered with the Financial Supervisory Commission of Taiwan pursuant to relevant securities laws and regulations and may not be sold, issued or offered within Taiwan through a public offering or in circumstances which constitutes an offer within the meaning of the Securities and Exchange Act of Taiwan that requires a registration or approval of the Financial Supervisory Commission of Taiwan. No person or entity in Taiwan has been authorized to offer, sell, give advice regarding or otherwise intermediate the offering and sale of the Notes in Taiwan.

Notice to Prospective Investors in Switzerland

The Notes may not be publicly offered in Switzerland and will not be listed on the SIX Swiss Exchange (“SIX”) or on any other stock exchange or regulated trading facility in Switzerland. Accordingly, this prospectus supplement and the accompanying prospectus do not constitute a prospectus within the meaning of, and have been prepared without regard to the disclosure standards for issuance prospectuses under article 652a or article 1156 of the Swiss Code of Obligations or the disclosure standards for listing prospectuses under article 27 ff. of the SIX Listing Rules or the listing rules of any other stock exchange or regulated trading facility in Switzerland. Each underwriter has represented and agreed not to publicly distribute or otherwise make publicly available in Switzerland this prospectus supplement or any other offering or marketing material relating to the Notes.

Neither this prospectus supplement nor any other offering or marketing material relating to the offering, the Company or the Notes have been or will be filed with or approved by any Swiss regulatory authority. In particular, this prospectus supplement will not be filed with, and the offer of Notes will not be supervised by, the

S-25

Table of Contents

Swiss Financial Market Supervisory Authority, and the offer of Notes has not been and will not be authorized under the Swiss Federal Act on Collective Investment Schemes (the “CISA”). The investor protection afforded to acquirers of interests in collective investment schemes under the CISA does not extend to acquirers of the Notes.

Notice to Prospective Investors in the United Arab Emirates

The offering of the Notes has not been approved or licensed by the UAE Central Bank, the UAE Securities and Commodities Authority (“SCA”), the Dubai Financial Services Authority (“DFSA”) or any other relevant licensing authorities in the UAE, and the Notes may not be offered to the public in the UAE (including the DIFC). This prospectus supplement is being issued to a limited number of institutional and individual investors: (a) who meet the criteria of a “Qualified Investor” as defined in the SCA Board of Directors Decision No. 3 R.M. of 2017 (but excluding subparagraph 1(d) in the “Qualified Investor” definition relating to natural persons); (b) upon their request and confirmation that they understand that the Notes have not been approved or licensed by or registered with the UAE Central Bank, the SCA, DFSA or any other relevant licensing authorities or governmental agencies in the UAE; and (c) upon their confirmation that they understand that the prospectus supplement must not be provided to any person other than the original recipient, and may not be reproduced or used for any other purpose.

LEGAL MATTERS

Certain legal matters in connection with the offering of the Notes will be passed upon for us by Heather A. Humphrey, our General Counsel and Senior Vice President — Corporate Services, and Hunton & Williams LLP, New York, New York. Certain legal matters will be passed upon for the underwriters by Pillsbury Winthrop Shaw Pittman LLP, New York, New York. From time to time, Pillsbury Winthrop Shaw Pittman LLP acts as counsel for us and our affiliates for various matters.

At February 20, 2018, Ms. Humphrey owned beneficially a number of shares of Great Plains Energy’s common stock, including restricted stock, and performance shares which may be paid in shares of Great Plains Energy common stock at a later date based on Great Plains Energy’s performance, which represented less than 0.1% of the total outstanding common stock of Great Plains Energy.

EXPERTS

The consolidated financial statements, and the related financial statement schedule, incorporated in this prospectus supplement by reference from the Annual Report on Form 10-K of Kansas City Power & Light Company and subsidiaries for the year ended December 31, 2017, and the effectiveness of Kansas City Power & Light Company and subsidiaries’ internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such consolidated financial statements and financial statement schedule have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

S-26

Table of Contents

PROSPECTUS

KANSAS CITY POWER & LIGHT COMPANY

Notes

General Mortgage Bonds

These securities are not obligations of, nor guaranteed by, Great Plains Energy Incorporated, our corporate parent.

Kansas City Power & Light Company (“KCP&L”) may offer and sell, from time to time, notes and general mortgage bonds in one or more offerings. We may offer the securities simultaneously or at different times, in one or more separate series, in amounts, at prices and on terms to be determined at or prior to the time or times of sale.

This prospectus provides you with a general description of these securities. We will provide specific information about the offering and the terms of these securities in one or more supplements to this prospectus. The supplements may also add, update or change information contained in this prospectus. This prospectus may not be used to offer and sell our securities unless accompanied by a prospectus supplement. You should read this prospectus and the related prospectus supplements before you invest in these securities.

Our principal executive offices are located at 1200 Main Street, Kansas City, Missouri 64105 and our telephone number is (816) 556-2200.

Investing in these securities involves risks. You should carefully consider the information referred to under the heading “Risk Factors” beginning on page 5 of this prospectus.

We may offer and sell these securities through one or more underwriters, dealers or agents or directly to purchasers, on a continuous or delayed basis. We will set forth in the related prospectus supplement the specific terms of the plan of distribution, including the name of the underwriters, dealers or agents, the discount or commission received by them from us as compensation, our other expenses for the offering and sale of these securities and the net proceeds we receive from the sale. See “Plan of Distribution.”

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The date of this prospectus is September 27, 2016.

Table of Contents

TABLE OF CONTENTS

i

Table of Contents

ABOUT THIS PROSPECTUS

This prospectus is part of a registration statement we have filed with the Securities and Exchange Commission, or the SEC, under the Securities Act of 1933, as amended, utilizing a “shelf” registration process. By using this process, we may, from time to time, sell any combination of the securities described in this prospectus in one or more offerings.

This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide you with a supplement to this prospectus that will describe the specific terms of that offering. The prospectus supplement may also add, update or change the information contained in this prospectus, including information about us. If there is any inconsistency between the information in this prospectus and the prospectus supplement, you should rely on the information in the prospectus supplement. The registration statement we filed with the SEC includes exhibits that provide more detail on descriptions of the matters discussed in this prospectus. Therefore, for a complete understanding of our securities being offered, we urge you to read carefully the registration statement (including the exhibits thereto), this prospectus and any prospectus supplement accompanying this prospectus, together with the information incorporated herein by reference under “Where You Can Find More Information”, before deciding whether to invest in any of our securities being offered.

You should rely only on the information contained or incorporated by reference in this prospectus and in any prospectus supplement, or in any free writing prospectus. We have not, and the underwriters have not, authorized anyone to provide you with different information and neither we nor the underwriters of any offering of securities will authorize anyone else to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the underwriters are not, making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information appearing in this prospectus, any prospectus supplement and the documents incorporated by reference is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed materially since those dates.

As described in more detail below under “Where You Can Find More Information,” we and Great Plains Energy Incorporated (“Great Plains Energy”), our parent company, separately file combined annual, quarterly and current reports. However, only the information related to KCP&L and its consolidated subsidiaries is incorporated by reference in this prospectus. You should not rely on any information relating solely to Great Plains Energy or its subsidiaries (other than the information provided separately by KCP&L or the subsidiaries of KCP&L) in determining whether to invest in any securities offered hereby. The securities are not guaranteed by Great Plains Energy or any of its or our subsidiaries. None of those entities has any obligation to make any capital contribution or to advance funds to us for the purpose of paying the principal of, or premium, if any, and interest on the securities or any other amount that may be required to be paid under any indenture, preventing or curing an event of default under the terms of any indenture, complying with any other obligation under any indenture or the securities or otherwise.

Unless the context otherwise requires or as otherwise indicated, when we refer to “Kansas City Power & Light,” “KCP&L,” the “Company,” “we,” “us” or “our” in this prospectus or when we otherwise refer to ourselves in this prospectus, we mean Kansas City Power & Light Company and, except as expressly stated or if the context requires otherwise, not any of its subsidiaries.

1

Table of Contents

CAUTIONARY STATEMENTS REGARDING

CERTAIN FORWARD-LOOKING INFORMATION

This prospectus and the documents incorporated or deemed incorporated by reference as described under the heading “Where You Can Find More Information” contain forward-looking statements that are not based on historical facts. In some cases, you can identify forward-looking statements by use of the words “may,” “should,” “expect,” “plan,” “anticipate,” “estimate,” “predict,” “potential,” or “continue.” Forward-looking statements include, but are not limited to, statements regarding the outcome of regulatory proceedings, cost estimates of capital projects and other matters affecting future operations. These forward-looking statements are based on assumptions, expectations, and assessments made by our management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. Any forward-looking statements are not guarantees of our future performance and are subject to risks and uncertainties, including those described or referred to under the heading “Risk Factors” in this prospectus, in any prospectus supplement, and in our other SEC filings. These risks and uncertainties could cause actual results, developments and business decisions to differ materially from those contemplated or implied by forward-looking statements. Consequently, you should recognize these statements for what they are and we caution you not to rely upon them as facts. We claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 for all forward-looking statements. We disclaim any duty to update the forward-looking statements, which apply only as of the date of this prospectus. Some of the factors that may cause actual results, developments and business decisions to differ materially from those contemplated by these forward-looking statements include the following:

2

Table of Contents

This list of factors is not all-inclusive because it is not possible to predict all factors. You should also carefully consider the information contained under the heading “Risk Factors” in this prospectus, any prospectus supplement and in our other SEC filings.

3

Table of Contents

KANSAS CITY POWER & LIGHT COMPANY

Kansas City Power & Light Company (“KCP&L”) is an integrated, regulated electric utility, headquartered in Kansas City, Missouri, that engages in the generation, transmission, distribution and sale of electricity. As of December 31, 2014, we served approximately 520,700 customers located in western Missouri and eastern Kansas. Our customers included approximately 459,000 residences, 59,600 commercial firms, and 2,100 industrials, municipalities and other electric utilities as of December 31, 2014. Our retail revenues averaged approximately 87% of our total operating revenues over the last three years. Wholesale firm power, bulk power sales and miscellaneous electric revenues accounted for the remainder of our revenues. We are significantly impacted by seasonality with approximately one-third of our retail revenues recorded in the third quarter.

4

Table of Contents

RISK FACTORS

Investing in our securities involves risks. Our business is influenced by many factors that are difficult to predict, involve uncertainties that may materially affect actual results and are often beyond our control. You should carefully consider the information under the heading “Risk Factors” in:

5

Table of Contents

RATIO OF EARNINGS TO FIXED CHARGES

The following table shows our ratio of earnings to fixed charges for the periods indicated:

For purposes of computing the ratios of earnings to fixed charges: (i) earnings consist of income before deducting net provisions for income taxes and fixed charges; and (ii) fixed charges consist of interest on debt, amortization of debt discount, premium and expense, and the estimated interest component of lease payments and rentals.

6

Table of Contents

USE OF PROCEEDS

Unless we inform you otherwise in a supplement to this prospectus, we anticipate using any net proceeds received by us from the issuance of any of the offered securities for general corporate purposes, including, among others:

Pending such uses, we may also invest the proceeds in certificates of deposit, United States government securities or certain other short-term interest-bearing securities. If we decide to use the net proceeds from a particular offering of securities for a specific purpose, we will describe that in the related prospectus supplement.

7

Table of Contents

DESCRIPTION OF NOTES

General

The notes will represent unsecured obligations of the Company. We will issue each series of notes under the Indenture, dated as of May 1, 2007, between the Company and The Bank of New York Mellon Trust Company, N.A., as trustee. We refer to this Indenture in this prospectus as the “Indenture” and to The Bank of New York Mellon Trust Company, N.A. as the “trustee.” If at any time there is more than one trustee under the Indenture, the term “trustee” as used in this section with respect to the notes of any series means the trustee with respect to the notes of that series.

We have summarized selected provisions of the Indenture below. However, the following statements are summaries only, do not purport to be complete and are subject to, and qualified in their entirety by, all of the provisions of the Indenture, which is incorporated by reference herein. Certain of the terms used below are used herein with the meanings ascribed to such terms by the Indenture. You should carefully read the summary below and the provisions of the Indenture that may be important to you before investing. The Indenture, and not the description contained herein, defines the rights of the holders of the notes. Copies of the Indenture will be available at the offices of the trustee at 2 North LaSalle Street, Suite 1020, Chicago, Illinois 60602.

The following sets forth certain general terms and provisions of the notes. The particular terms of the series of notes offered by any prospectus supplement will be described in that prospectus supplement. The Indenture provides that the notes may be issued in one or more series, may be issued at various times, may have differing maturity dates, may bear interest at differing rates and may have other differing terms and conditions, as described below. We need not issue all notes of one series at the same time and, unless otherwise provided, we may reopen a series, without the consent of the holder of the notes of that series for issuances of additional notes. One or more series of the notes may be issued with the same or various maturities at par, above par or at a discount. Notes bearing no interest or interest at a rate which, at the time of issuance, is below the market rate (“Original Issue Discount Securities”) will be sold at a discount (which may be substantial) below their stated principal amount. Federal income tax consequences and other special considerations applicable to any such Original Issue Discount Securities will be described in the prospectus supplement relating to those securities. Unless otherwise described in the applicable prospectus supplement, the Indenture does not limit the aggregate amount of debt, including secured debt, that we or our subsidiaries may incur. There is no limitation of the amount of debt we may issue under the Indenture. The Indenture also permits us to merge or consolidate or to transfer or lease our assets, subject to certain conditions (see “—Consolidation, Merger and Sale or Disposition of Assets” below).

Ranking

Each series of notes will be our direct unsecured general obligations and will rank equally with all of our other unsecured and unsubordinated debt. As of December 31, 2014, our aggregate outstanding debt that would have ranked equally with the notes was approximately $2,078.2 million.

Unless otherwise provided in a prospectus supplement, the notes will effectively rank junior to our mortgage bonds which were issued under our Mortgage Indenture. The Mortgage Indenture constitutes a mortgage lien upon substantially all of our fixed property and franchises, except property that has been, or may in the future be, released from the lien of the Mortgage Indenture. At December 31, 2014, there was approximately $596.4 million aggregate principal amount of mortgage bonds outstanding. We have agreed with the issuer of certain bond insurance policies to not issue additional mortgage bonds without the insurer’s consent if, after giving effect to such additional mortgage bonds, the proportion of secured debt to total indebtedness exceeded 75%. Additionally, if the long term rating for such mortgage bonds by Standard & Poor’s or Moody’s Investors Service would be at or below A- or A3, respectively, such agreements would prohibit us from issuing additional mortgage bonds if, after giving effect to such additional mortgage bonds, the proportion of secured debt to total indebtedness exceeded 50%. At December 31, 2014, the proportion of secured debt to total indebtedness was approximately 22%.

8

Table of Contents

Provisions of a Particular Series

The prospectus supplement applicable to each issuance of notes will specify, among other things:

Registration, Transfer and Exchange

Unless otherwise indicated in the applicable prospectus supplement, each series of notes will initially be issued in the form of one or more global securities, in registered form, without coupons, as described under “Book-Entry System.” The global securities will be registered in the name of a depository, or its nominee, and deposited with, or on behalf of, the depository. Except in the circumstances described under “Book-Entry System,” owners of beneficial interests in a global security will not be entitled to have notes registered in their names, will not receive or be entitled to receive physical delivery of any notes and will not be considered the registered holders thereof under the Indenture.

9

Table of Contents

Notes of any series will be exchangeable for other notes of the same series of any authorized denominations and of a like aggregate principal amount and tenor. Subject to the terms of the Indenture and the limitations applicable to global securities, notes may be presented for exchange or registration of transfer—duly endorsed or accompanied by a duly executed instrument of transfer—at the office of any transfer agent we may designate for such purpose, without service charge but upon payment of any taxes and other governmental charges, and upon satisfaction of such other reasonable requirements as are described in the Indenture.

Unless otherwise indicated in the applicable prospectus supplement, the transfer agent will be the trustee under the Indenture. We may at any time designate additional transfer agents or rescind the designation of any transfer agent or approve a change in the office through which any transfer agent acts, except that we will be required to maintain a transfer agent in each place of payment for the notes of each series.

Payment and Paying Agents

Principal of and interest and premium, if any, on notes issued in the form of global securities will be paid in the manner described under “Book-Entry System” or as otherwise set forth in the applicable prospectus supplement.

Unless otherwise indicated in the applicable prospectus supplement, the principal of and any premium and interest on notes of a particular series in the form of certificated securities will be payable at the office of the trustee or at the authorized office of any paying agent or paying agents upon presentation and surrender of such notes. We may at any time designate additional paying agents or rescind the designation of any paying agent or approve a change in the office through which any paying agent acts, except that we will be required to maintain a paying agent in each place of payment for the notes of a particular series. Unless otherwise indicated in the applicable prospectus supplement, interest on the notes of a particular series, other than interest at maturity, that are in the form of certificated securities will be paid by check payable in clearinghouse funds mailed to the person entitled thereto at such person’s address as it appears on the register for such notes maintained by the trustee.

All monies we pay to the trustee or a paying agent for the payment of the principal of, and premium or interest, if any, on, any note which remain unclaimed at the end of two years after such principal, premium or interest shall have become due and payable will be repaid to us, and the holder of such note thereafter may look only to us for payment thereof. However, any such payment shall be subject to escheat pursuant to state abandoned property laws.

Redemption

Any terms for the optional or mandatory redemption of the notes will be set forth in the applicable prospectus supplement. Unless otherwise indicated in the applicable prospectus supplement, notes will be redeemable by us only upon notice by mail not less than 30 nor more than 60 days prior to the date fixed for redemption, and, if less than all the notes of a series are to be redeemed, the particular notes to be redeemed will be selected by such method as shall be provided for any particular series, or in the absence of any such provision, by the trustee in such manner as it shall deem fair and appropriate.

Any notice of redemption at our option may state that such redemption will be conditional upon receipt by the trustee or the paying agent or agents, on or prior to the date fixed for such redemption, of money sufficient to pay the principal of and premium, if any, and interest on such notes and that if such money has not been so received, such notice will be of no force and effect and we will not be required to redeem such notes.

10

Table of Contents

Consolidation, Merger and Sale or Disposition of Assets

We may not, without the consent of the holders of any notes, consolidate with or merge into any other corporation or sell, transfer, lease or otherwise dispose of our properties as or substantially as an entirety to any person, unless:

Upon any such consolidation, merger, sale, transfer, lease or other disposition of our properties as or substantially as an entirety, the successor corporation formed by such consolidation or into which we are merged or the person to whom such sale, transfer, lease or other disposition is made, shall succeed to, and be substituted for, and may exercise every right and power of, us under the Indenture with the same effect as if such successor corporation or person had been named as us therein, and we will be released from all obligations under the Indenture.

Modification

Without the consent of any holder of notes, the trustee for such notes and we may enter into one or more supplemental indentures for any of the following purposes:

11

Table of Contents

Except as provided above, and except as otherwise provided in the applicable prospectus supplement, the consent of the holders of a majority in aggregate principal amount of the notes of all series then outstanding, considered as one class, is required for the purpose of adding any provisions to, or changing in any manner, or eliminating any of the provisions of, the Indenture pursuant to one or more supplemental indentures or of modifying or waiving in any manner the rights of the holders of the notes; provided, however, that if less than all of the series of notes outstanding are directly affected by a proposed supplemental indenture, then the consent only of the holders of a majority in aggregate principal amount of the outstanding applicable notes of all series so directly affected, considered as one class, will be required.

Notwithstanding the foregoing, no such amendment or modification may, without the consent of each holder of outstanding notes affected thereby:

A supplemental indenture which changes or eliminates any covenant or other provision of the Indenture which has expressly been included solely for the benefit of one or more series of notes, or which modifies the rights of the holders of notes of such series with respect to such covenant or provision, will be deemed not to affect the rights under the Indenture of the holders of the notes of any other series.

Events of Default

Unless specifically deleted in a supplemental indenture or Board of Directors resolution under which a series of notes is issued, or modified in any such supplemental indenture or resolution, each of the following will constitute an event of default under the Indenture with respect to notes of any series:

12

Table of Contents

Additional events of default with respect to a particular series of notes may be specified in a supplemental indenture or resolution of the Board of Directors establishing that series.

No event of default with respect to the notes of a particular series necessarily constitutes an event of default with respect to the notes of any other series issued under the Indenture.

If an event of default with respect to any series of notes occurs and is continuing, then either the trustee for such series or the holders of a majority in aggregate principal amount of the outstanding notes of such series, by notice in writing, may declare the principal amount of and interest on all of the notes of such series to be due and payable immediately; provided, however, that if an event of default occurs and is continuing with respect to more than one series of notes under the Indenture, the trustee for such series or the holders of a majority in aggregate principal amount of the outstanding notes of all such series, considered as one class, may make such declaration of acceleration and not the holders of the notes of any one of such series.

At any time after an acceleration with respect to the notes of any series has been declared, but before a judgment or decree for the payment of the money due has been obtained, the event or events of default giving rise to such acceleration will be waived, and the acceleration will be rescinded and annulled, if:

However, no such waiver or rescission and annulment shall extend to or shall affect any subsequent default or impair any related right.

Subject to the provisions of the Indenture relating to the duties of the trustee in case an event of default shall occur and be continuing, the trustee generally will be under no obligation to exercise any of its rights or powers under the Indenture at the request or direction of any of the holders unless such holders have offered to the trustee reasonable security or indemnity satisfactory to it. Subject to such provisions for the indemnification of the trustee and certain other limitations contained in the Indenture, the holders of a majority in aggregate principal amount of the outstanding notes of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or of exercising any trust or power conferred on the trustee, with respect to the notes of that series; provided, however, that if an event of default occurs and is continuing with respect to more than one series of notes, the holders of a majority in aggregate principal amount of the outstanding notes of all those series, considered as one class, will have the right to make such direction, and not the holders of the notes of any one series. Any direction provided by the holders shall not be in conflict with any rule of law or with the Indenture and will not involve the trustee in personal liability in circumstances where reasonable indemnity would not, in the trustee’s sole discretion, be adequate and the trustee may take any other action it deems proper that is not inconsistent with such direction.

The holders of a majority in aggregate principal amount of the outstanding notes of any series may waive any past default or event of default under the Indenture on behalf of all holders of notes of that series with respect to the notes of that series, except a default in the payment of principal of or any premium or interest on such notes. No holder of notes of any series may institute any proceeding with respect to the Indenture, or for the appointment of a receiver or a trustee, or for any other remedy, unless such holder has previously given to the trustee for such series written notice of a continuing event of default with respect to the notes of such series, the holders of a majority in aggregate principal amount of the outstanding notes of all series in respect of which an

13

Table of Contents

event of default has occurred and is continuing, considered as one class, have made written request to the trustee for such series to institute such proceeding and have offered such reasonable indemnity as the trustee may require, and the trustee for such series has failed to institute such proceeding within 60 days after such notice, request and offer. Furthermore, no holder of notes of any series will be entitled to institute any such action if and to the extent that such action would disturb or prejudice the rights of other holders of those notes.

Notwithstanding the foregoing, each holder of notes of any series has the right, which is absolute and unconditional, to receive payment of the principal of and premium, if any, and interest on such notes when due and to institute suit for the enforcement of any such payment, and such rights may not be impaired without the consent of that holder of notes.

The trustee, within 90 days after it receives notice of the occurrence of a default with respect to the notes of any series, is required to give the holders of the notes of that series notice of such default, unless cured or waived, but, except in the case of default in the payment of principal of, or premium, if any, or interest on, the notes of that series, the trustee may withhold such notice if it determines in good faith that it is in the interest of such holders to do so. We will be required to deliver to the trustees for the notes each year a certificate as to whether or not, to the knowledge of the officers signing such certificate, we are in compliance with all conditions and covenants under the Indenture, determined without regard to any period of grace or requirement of notice under the Indenture.

Defeasance

Unless the applicable prospectus supplement states otherwise, we may elect either:

In the case of either (1) or (2), the following conditions, among others, must be met:

14

Table of Contents

We may exercise our defeasance option under paragraph (1) with respect to notes of any series notwithstanding our prior exercise of our covenant defeasance option under paragraph (2). If we exercise our defeasance option under paragraph (1) for notes of any series, payment of the notes of such series may not be accelerated because of a subsequent event of default. If we exercise our covenant defeasance option for notes of any series, payment of the notes of such series may not be accelerated by reference to a subsequent breach of any of the covenants noted under paragraph (2) above. In the event we fail to comply with our remaining obligations with respect to the notes of any series under the Indenture after exercising our covenant defeasance option and the notes of such series are declared due and payable because of the subsequent occurrence of any event of default, the amount of money and U.S. government obligations on deposit with the trustee may be insufficient to pay amounts due on the notes of such series at the time of the acceleration resulting from that event of default. However, we will remain liable for those payments.

Resignation or Removal of Trustee

The trustee may resign at any time upon written notice to us specifying the day upon which the resignation is to take effect and such resignation will take effect immediately upon the later of the appointment of a successor trustee and such specified day. The trustee may be removed at any time with respect to notes of any series by an instrument or concurrent instruments in writing filed with the trustee and signed by the holders, or their attorneys-in-fact, of a majority in aggregate principal amount of that series of notes then outstanding. In addition, so long as no event of default or event which, with the giving of notice or lapse of time or both, would become an event of default has occurred and is continuing, we may remove the trustee upon notice to the holder of each note outstanding and the trustee, and appoint a successor trustee.

Concerning the Trustee

As of December 31, 2014, The Bank of New York Mellon Trust Company, N.A., which is the trustee under the Indenture, and its affiliates were the trustees for $1,916.3 million of our secured and unsecured debt (including Environmental Improvement Revenue debt and Environmental Improvement Revenue Refunding debt issued by certain governmental entities) and $737.5 million of the unsecured debt of Great Plains Energy Incorporated under several separate indentures. In addition, an affiliate of The Bank of New York Mellon Trust Company, N.A. is one of the lenders under separate credit agreements with us, our parent and an affiliate and is the trustee under our nuclear decommissioning fund trust. Affiliates of The Bank of New York Mellon Trust Company, N.A. also perform other services for, and transact other banking business with, our affiliates and us in the normal course and may do so in the future. The Indenture provides that our obligations to compensate the trustee and reimburse the trustee for expenses, disbursements and advances will be secured by a lien prior to that of the notes upon the property and funds held or collected by the trustee as such, except funds held in trust for the benefit of the holders of particular notes.

Governing Law

The Indenture is, and the related notes will be, governed by New York law.

15

Table of Contents

DESCRIPTION OF GENERAL MORTGAGE BONDS

We will issue each series of general mortgage bonds under the General Mortgage Indenture and Deed of Trust, dated as of December 1, 1986, as supplemented from time to time, executed by the Company to UMB Bank, N.A. (formerly United Missouri Bank of Kansas City, N.A.), as trustee. We refer in this prospectus to the general mortgage bonds as the “mortgage bonds,” to the mortgage as the “Mortgage Indenture” and to UMB Bank, N.A. as the “Mortgage Trustee.”

We have summarized selected provisions of the Mortgage Indenture below. However, the following statements are an outline only, do not purport to be complete, and are qualified in their entirety by reference to the Mortgage Indenture, which is incorporated by reference as an exhibit to the registration statement of which this prospectus is a part. Certain of the terms used below are used in this prospectus with the meanings ascribed to such terms by the Mortgage Indenture.

The following sets forth certain general terms and provisions of the mortgage bonds. The particular terms of the series of mortgage bonds offered by any prospectus supplement will be described in that prospectus supplement. Any terms of the mortgage bonds that are not summarized herein will be described in the applicable prospectus supplement.

Security and Priority

The Company’s principal plants and properties, insofar as they constitute real estate, are owned; certain other facilities of the Company are located on premises held by the Company under leases, permits or easements; and the Company’s electric transmission and distribution lines and systems (which constitute a substantial portion of the Company’s investment in physical property) are for the most part located over or under highways, streets, other public places or property owned by others for which permits, grants, easements, licenses or franchises (deemed satisfactory but without examination of underlying land titles) have been obtained.

The Mortgage Indenture constitutes a mortgage lien upon substantially all of the fixed property and franchises of the Company (except property that has been, or may in the future be, released from the lien of the Mortgage Indenture, as described below), consisting principally of electric generating plants, electric transmission and distribution lines and systems, and buildings, subject to encumbrances permitted under the Mortgage Indenture. (Mortgage Indenture Section 1.03(ff).) The Mortgage Indenture subjects to the lien thereof property, of the character initially mortgaged, which is acquired by the Company subsequent to December 1, 1986. Such after-acquired property may be subject to prior liens which secure debt outstanding at the time of such acquisition in an amount not in excess of 75% of the cost or fair value, whichever is less, of such after-acquired property at such time. (Mortgage Indenture Section 1.03(ff)(xv).)

The property excepted from the lien of the Mortgage Indenture consists principally of: cash and securities (unless deposited with the Mortgage Trustee); accounts receivable; contracts and operating agreements not pledged or required to be pledged with the Mortgage Trustee; equipment, spare parts, tools, materials, supplies and fuel held for sale or lease in the ordinary course of business or for use or consumption in, or the operation of, any properties of, or for the benefit of, the Company, or held in advance of use thereof for maintenance or fixed capital purposes; electricity, gas, steam, water, ice and other materials, products or services for sale, distribution or use; vehicles; leasehold interests and leasehold improvements; minerals and mineral rights; nuclear fuel, cores and materials; communications equipment, computers and office furniture; and other real and personal property which is not an integral part of the electric and any steam generating, transmission and distribution operations of the Company. (Mortgage Indenture Section 1.03(s).)

The mortgage bonds will rank equally and ratably (except as to sinking funds and other analogous funds established for the exclusive benefit of a particular series) with all mortgage bonds, regardless of series, from time to time issued and outstanding under the Mortgage Indenture.

16

Table of Contents

The Mortgage Indenture provides that the Mortgage Trustee shall have a lien on the mortgaged property, prior to the mortgage bonds, for the payment of its reasonable compensation and expenses and for indemnity against certain liabilities. (Mortgage Indenture Section 14.09.)

Issuance of Additional Mortgage Bonds. The maximum principal amount of mortgage bonds which may be issued under the Mortgage Indenture is not limited. Mortgage bonds of any series may be issued from time to time in principal amounts:

(Mortgage Indenture Articles III, IV, V and VI.)

“Bondable property” includes: the Company’s electric and any steam generating, transmission and distribution properties; construction work in progress; property in the process of purchase to which the Company has legal title; fractional and undivided interests of the Company in certain property owned jointly or in common with other persons; engineering, financial, economic, environmental, geological and legal or other surveys, data processing equipment and software associated with the acquisition or construction of property; paving, grading and other improvements to property owned by others but used by the Company; and certain property owned by the Company located on property owned by others, including governments. (Mortgage Indenture Section 1.03(h).)

“Prior lien bonds” means any indebtedness secured by liens either (i) existing both at and immediately prior to the acquisition of the property by the Company, or (ii) created as purchase money mortgages at the time the Company acquires the property, and in each case ranking prior to, or on a parity with, the lien of the Mortgage Indenture. (Mortgage Indenture Sections 1.03(hh) and 1.03(ii).)

The amount of bondable property is the lesser of its cost or fair value determined in accordance with generally accepted accounting principles in effect at December 1, 1986 or, at the option of the Company, at the date of their determination, minus 133 1/3% of the principal amount of all prior lien bonds which are (a) outstanding and secured by a prior lien on bondable property owned by the Company at December 1, 1986, and (b) outstanding and secured by a prior lien, other than due solely to an after-acquired property clause, on bondable property at the date of its acquisition by the Company after such date. (Mortgage Indenture Section 1.03(h).) In determining generally accepted accounting principles, the Company may conform to accounting orders from any governmental regulatory commission. (Mortgage Indenture Section 1.03(u).)

Withdrawal of Certain Cash

Cash deposited with the Mortgage Trustee as a basis for the issue of additional mortgage bonds may be withdrawn by the Company in the amount of 75% of the lesser of the cost or fair value of unbonded bondable property that is bonded, after deducting 133 1/3% of the principal amount of all prior lien bonds which are (a) outstanding and secured by a prior lien on such bondable property owned by the Company at December 1, 1986, and (b) outstanding and secured by a prior lien, other than due solely to an after-acquired property clause, on bondable property at the date of its acquisition by the Company after such date.

Any other cash deposited with the Mortgage Trustee may be withdrawn by the Company in the amount of:

17

Table of Contents

(Mortgage Indenture Article XI.)

Release and Substitution of Property

Mortgaged property may be released from the lien of the Mortgage Indenture:

(Mortgage Indenture Article X.)

Events of Default

The Mortgage Indenture provides generally that a default occurs upon:

In case of default, the Mortgage Trustee or the holders of a majority in principal amount of the outstanding mortgage bonds may declare the principal of and interest on all mortgage bonds to be immediately due and payable, but the holders of a majority in principal amount of the outstanding mortgage bonds may rescind such declaration if such default has been cured. (Mortgage Indenture Sections 12.02 and 12.04.)

The Company is required to file with the Mortgage Trustee such information, documents and reports with respect to compliance by the Company with the conditions and covenants of the Mortgage Indenture as may be required by the rules and regulations of the SEC. (Mortgage Indenture Section 17.02.) The Company is not required to furnish any statement as to the absence of any default.

18

Table of Contents

Modification of the Mortgage Indenture

In general, modifications or alterations of the Mortgage Indenture and any applicable supplemental indenture and of the rights or obligations of the Company and of the bondholders, as well as waivers of compliance with the Mortgage Indenture (including any applicable supplemental indenture) may be made, with the consent of the holders of a majority in principal amount of the outstanding mortgage bonds affected by the proposed action, if approved by the Company. Provisions relating to such modifications or alterations and waivers of compliance are subject to certain restrictions designed to safeguard the positions of the bondholders and the Mortgage Trustee with respect to certain matters of basic importance, including payment of principal of and interest and premium (if any) on mortgage bonds and creation of liens ranking prior to or on a parity with the lien of the Mortgage Indenture as to any mortgaged property. (Mortgage Indenture Section 12.24 and Article XV.)

Concerning the Mortgage Trustee

As of December 31, 2014, the Mortgage Trustee was the trustee for $400.0 million of mortgage bonds issued under the Mortgage Indenture. In addition, the Company and its affiliates maintain general banking accounts with the Mortgage Trustee. The Mortgage Trustee is also one of the lenders under separate credit agreements with us, our parent and one of our affiliates.

The Mortgage Indenture provides that the holders of a majority in principal amount of the outstanding mortgage bonds have the right to require the Mortgage Trustee to take certain action on behalf of the bondholders, but under certain circumstances the Mortgage Trustee may decline to follow such directions or to exercise certain of its powers. (Mortgage Indenture Section 12.05.) Prior to taking any such action the Mortgage Trustee is entitled to indemnity satisfactory to the Mortgage Trustee against costs, expenses and liabilities which may be incurred in the course of such action. (Mortgage Indenture Section 12.16.) This right does not, however, impair the absolute right of any holder of mortgage bonds to enforce payment of the principal of, or premium, if any, and interest on such mortgage bonds when due. (Mortgage Indenture Section 12.23.) The Company has the right to remove the Mortgage Trustee and appoint a successor Mortgage Trustee not more frequently than once in any ten-year period. (Mortgage Indenture Section 14.18.)

19

Table of Contents

BOOK-ENTRY SYSTEM

Unless otherwise indicated in the applicable prospectus supplement, each series of notes or general mortgage bonds will initially be issued in the form of one or more global securities, in registered form, without coupons. The global securities will be deposited with, or on behalf of, the depository, and registered in the name of the depository or a nominee of the depository. Unless otherwise indicated in the applicable prospectus supplement, the depository for any global securities will be The Depository Trust Company, or DTC.

So long as the depository, or its nominee, is the registered owner of a global security, such depository or such nominee, as the case may be, will be considered the owner of such global security for all purposes under the applicable indenture, including for any notices and voting. Except in limited circumstances, the owners of beneficial interests in a global security will not be entitled to have securities registered in their names, will not receive or be entitled to receive physical delivery of any such securities and will not be considered the registered holder thereof under the applicable indenture. Accordingly, each person holding a beneficial interest in a global security must rely on the procedures of the depository and, if such person is not a direct participant, on procedures of the direct participant through which such person holds its interest, to exercise any of the rights of a registered owner of such security.

Except as otherwise provided in any applicable prospectus supplement, global securities may be exchanged in whole for certificated securities only if the depository notifies us that it is unwilling or unable to continue as depository for the global securities or the depository has ceased to be a clearing agency registered under the Exchange Act and, in either case, we thereupon fail to appoint a successor depository within 90 days. We may decide to discontinue use of the system of book-entry-only transfers through DTC (or a successor securities depository), subject to DTC’s or such successor’s procedures, as the case may be.

In any such case, we have agreed to notify the applicable trustee in writing that, upon surrender by the direct participants and indirect participants of their interest in such global securities, certificated securities representing the applicable securities will be issued to each person that such direct participants and indirect participants and the depository identify as being the beneficial owner of such securities.

The following is based solely on information furnished by DTC:

DTC will act as depository for the global securities. The global securities will be issued as fully-registered securities registered in the name of Cede & Co. (DTC’s partnership nominee) or such other name as may be requested by an authorized representative of DTC. One fully-registered global security certificate will be issued for each issue of the global securities, each in the aggregate principal amount of such issue, and will be deposited with DTC. If, however, the aggregate principal amount of any issue of a series of debt securities exceeds $500 million, one certificate will be issued with respect to each $500 million of principal amount, and an additional certificate will be issued with respect to any remaining principal amount of such series. DTC is a limited-purpose trust company organized under the New York Banking Law, a “banking organization” within the meaning of the New York Banking Law, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the New York Uniform Commercial Code, and a “clearing agency” registered pursuant to the provisions of Section 17A of the Securities Exchange Act of 1934. DTC holds and provides asset servicing for securities that its direct participants deposit with DTC. DTC also facilitates the post-trade settlement among direct participants of sales and other securities transactions in deposited securities, through electronic computerized book-entry transfers and pledges between direct participants’ accounts. This eliminates the need for physical movement of securities certificates.

Direct participants include both U.S. and non-U.S. securities brokers and dealers, banks, trust companies, clearing corporations and certain other organizations. DTC is a wholly-owned subsidiary of The Depository Trust & Clearing Corporation (“DTCC”). DTCC is the holding company for DTC, National Securities Clearing Corporation and Fixed Income Clearing Corporation, all of which are registered clearing agencies. DTCC is

20

Table of Contents

owned by the users of its regulated subsidiaries. Access to the DTC system is also available to others such as both U.S. and non-U.S. securities brokers and dealers, banks, trust companies and clearing corporations that clear through or maintain a custodial relationship with a direct participant, either directly or indirectly, which are referred to as indirect participants and, together with the direct participants, the participants. The DTC rules applicable its participants are on file with the SEC. More information about DTC can be found at www.dtcc.com. The contents of such website do not constitute part of this prospectus.

Purchases of global securities under the DTC system must be made by or through direct participants, who will receive a credit for the global securities on DTC’s records. The ownership interest of each actual purchaser of each global security, or beneficial owner, is in turn to be recorded on the direct and indirect participants’ records. Beneficial owners will not receive written confirmation from DTC of their purchase. Beneficial owners, however, are expected to receive written confirmations providing details of the transaction, as well as periodic statements of their holdings, from the direct or indirect participant through which the beneficial owner entered into the transaction. Transfers of ownership interests in the global securities are to be accomplished by entries made on the books of direct and indirect participants acting on behalf of beneficial owners. Beneficial owners will not receive certificates representing their ownership interests in the global securities, except in the event that use of the book-entry system for the global securities is discontinued.

To facilitate subsequent transfers, all global securities deposited by direct participants with DTC are registered in the name of DTC’s partnership nominee, Cede & Co., or such other name as may be requested by an authorized representative of DTC. The deposit of global securities with DTC and their registration in the name of Cede & Co. or such other DTC nominee do not effect any change in beneficial ownership. DTC has no knowledge of the actual beneficial owners of the global securities; DTC’s records reflect only the identity of the direct participants to whose accounts such global securities are credited, which may or may not be the beneficial owners. The direct and indirect participants will remain responsible for keeping account of their holdings on behalf of their customers.

Conveyance of notices and other communications by DTC to direct participants, by direct participants to indirect participants, and by direct participants and indirect participants to beneficial owners will be governed by arrangements among them, subject to any statutory or regulatory requirements as may be in effect from time to time. Beneficial owners of global securities may wish to take certain steps to augment the transmission to them of notices of significant events with respect to the global securities, such as redemptions, tenders, defaults, and proposed amendments to the security documents. For example, beneficial owners of global securities may wish to ascertain that the nominee holding the global securities for their benefit has agreed to obtain and transmit notices to beneficial owners. In the alternative, beneficial owners may wish to provide their names and addresses to the registrar and request that copies of the notices be provided directly to them.

If the global securities are redeemable, redemption notices shall be sent to DTC. If less than all of the global securities are being redeemed, DTC’s practice is to determine by lot the amount of the interest of each direct participant in such issue to be redeemed.

Neither DTC nor Cede & Co. (nor any other DTC nominee) will consent or vote with respect to the global securities unless authorized by a direct participant in accordance with DTC’s procedures. Under its usual procedures, DTC mails an omnibus proxy to us as soon as possible after the record date. The omnibus proxy assigns Cede & Co.’s consenting or voting rights to those direct participants to whose accounts the global securities are credited on the record date, identified in a listing attached to the omnibus proxy.

Principal, distributions, interest and premium payments, if any, on the global securities will be made to Cede & Co., or such other nominee as may be requested by an authorized representative of DTC. DTC’s practice is to credit direct participants’ accounts upon DTC’s receipt of funds and corresponding detail information from us or the trustee for such securities, on the payable date in accordance with their respective holdings shown on DTC’s records. Payments by participants to beneficial owners will be governed by standing instructions and

21

Table of Contents

customary practices, as is the case with securities held for the accounts of customers in bearer form or registered in “street name,” and will be the responsibility of such participant and not of DTC, the trustee for such securities, or us, subject to any statutory or regulatory requirements as may be in effect from time to time. Payment of principal, distributions, interest and premium, if any, on any of the aforementioned securities represented by global securities to Cede & Co. (or such other nominee as may be requested by an authorized representative of DTC) is the responsibility of the appropriate trustee and us. Disbursement of such payments to direct participants shall be the responsibility of DTC, and disbursement of such payments to the beneficial owners shall be the responsibility of the participants.

DTC may discontinue providing its services as depository with respect to the global securities at any time by giving reasonable notice to us or the applicable trustee. Under such circumstances, in the event that a successor depository is not obtained, securities certificates will be required to be printed and delivered to the holders of record. Additionally, we may decide to discontinue use of the system of book-entry transfers through DTC (or a successor securities depository) with respect to the global securities.

The information in this section concerning DTC and DTC’s book-entry system has been obtained from sources, including DTC, that we believe to be reliable, but we take no responsibility for the accuracy thereof.

The underwriters, dealers or agents of any of the securities may be direct participants of DTC.

None of the trustees, us or any agent for payment on or registration of transfer or exchange of any global security will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial interests in such global security or for maintaining, supervising or reviewing any records relating to such beneficial interests.

22

Table of Contents

PLAN OF DISTRIBUTION

We may sell the securities in one or more of the following ways from time to time: (i) to underwriters for resale to the public or to institutional investors; (ii) directly to institutional investors; or (iii) through dealers or agents to the public or to institutional investors. The prospectus supplement with respect to each series of securities will set forth the terms of the offering of such securities, including the name or names of any underwriters, dealers or agents, the purchase price of such securities, and the proceeds to us from such sale, any underwriting discounts or agency fees and other items constituting underwriters’, dealers’ or agents’ compensation, any initial public offering price, any discounts or concessions allowed or reallowed or paid to dealers and any securities exchange on which such securities may be listed.

If underwriters participate in the sale, such securities will be acquired by the underwriters for their own account and may be resold from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price or at varying prices determined at the time of sale. The securities may be offered to the public either through underwriting syndicates represented by one or more managing underwriters or directly by one or more of those firms. The specific managing underwriter or underwriters, if any, will be named in the prospectus supplement relating to the particular securities together with the members of the underwriting syndicate, if any.

Unless otherwise set forth in the applicable prospectus supplement, the obligations of the underwriters to purchase any series of securities will be subject to certain conditions precedent and the underwriters will be obligated to purchase all of such securities being offered, if any are purchased.

We may sell the securities directly or through agents we designate from time to time. The applicable prospectus supplement will set forth the name of any agent involved in the offer or sale of the securities in respect of which such prospectus supplement is delivered and any commissions payable by us to such agent. Unless otherwise indicated in the applicable prospectus supplement, any agent will be acting on a best efforts basis for the period of its appointment.

Underwriters and agents may be entitled under agreements entered into with us to indemnification against certain civil liabilities, including liabilities under the Securities Act of 1933, as amended. Underwriters and agents may engage in transactions with, or perform services for, us in the ordinary course of business.

Each series of securities will be a new issue of securities and will have no established trading market. Any underwriters to whom securities are sold for public offering and sale may make a market in such securities, but such underwriters will not be obligated to do so and may discontinue any market making at any time without notice. The securities may or may not be listed on a national securities exchange.

23

Table of Contents

LEGAL MATTERS

Legal matters with respect to the securities offered under this prospectus will be passed upon for us by Jaileah X. Huddleston, Assistant Secretary and Corporate Counsel—Securities and Finance and Hunton & Williams LLP. Davis Polk & Wardwell LLP will pass on certain matters for the underwriters, dealers, purchasers, or agents. At February 13, 2015, Ms. Huddleston owned beneficially a number of shares of common stock of Great Plains Energy Incorporated, including restricted stock, and performance shares which may be paid in shares of common stock at a later date based on Great Plains Energy Incorporated’s performance, which represented less than 0.1% of the total outstanding common stock of Great Plains Energy Incorporated.

EXPERTS

The consolidated financial statements, and the related financial statement schedule, incorporated in this prospectus by reference from Kansas City Power & Light Company’s Annual Report on Form 10-K for the year ended December 31, 2014, and the effectiveness of Kansas City Power & Light Company and subsidiaries’ internal control over financial reporting, have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports which are incorporated herein by reference. Such financial statements and financial statement schedule have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

24

Table of Contents

WHERE YOU CAN FIND MORE INFORMATION

We file annual, quarterly and current reports and other information with the SEC through the SEC’s Electronic Data Gathering, Analysis and Retrieval system and these filings are publicly available through the SEC’s website (http://www.sec.gov). You may read and copy such material at the Public Reference Room of the SEC at 100 F Street, N.E., Washington, D.C. 20549. You may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330.

The SEC allows us to “incorporate by reference” into this prospectus the information we file with them. This means that we can disclose important information to you by referring you to the documents containing the information. The information we incorporate by reference is considered to be included in and an important part of this prospectus and should be read with the same care. Information that we file later with the SEC that is incorporated by reference into this prospectus will automatically update and supersede this information. We are incorporating by reference into this prospectus the following documents that we have filed with the SEC and any subsequent filings we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended (excluding information deemed to be furnished and not filed with the SEC) until the offering of the securities described in this prospectus is completed:

We and our parent company, Great Plains Energy Incorporated, separately filed the combined Annual Report on Form 10-K and the Current Reports on Form 8-K listed above. However, the information contained in those combined reports relating solely to our parent and its subsidiaries (other than KCP&L and its consolidated subsidiaries) was separately filed by Great Plains Energy Incorporated on its behalf, and the information contained in those combined reports relating solely to KCP&L and its consolidated subsidiaries was separately filed by us. We do not intend to incorporate by reference into this prospectus the information relating to Great Plains Energy Incorporated and its subsidiaries (other than KCP&L and its consolidated subsidiaries), and we make no representation as to the information relating to Great Plains Energy Incorporated and its subsidiaries (other than KCP&L and its consolidated subsidiaries) contained in such combined reports. The only information you should rely upon in determining whether to invest in the securities offered hereby is the information of KCP&L and its consolidated subsidiaries contained in this prospectus and any prospectus supplement, the information separately provided by KCP&L and its consolidated subsidiaries in the documents incorporated by reference herein and therein and any free writing prospectus used in connection with the offering of securities described in this prospectus.

Our website is www.kcpl.com. Information contained on our website is not incorporated herein. We make available, free of charge, on or through our website, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. In addition, we make available on or through our website all other reports, notifications and certifications filed electronically with the SEC. You may obtain a free copy of our filings with the SEC by writing or telephoning us at the following address: Kansas City Power & Light Company, 1200 Main Street, Kansas City, Missouri 64105 (Telephone No.: 816-556-2200), Attention: Corporate Secretary, or by contacting us on our website.

25

Table of Contents

$                

Kansas City Power & Light Company

% Notes due

PROSPECTUS   SUPPLEMENT

February     , 2018

Joint Book-Running Managers

Co-Managers