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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

For the quarterly period ended March 31, 2007

OR

For the transition period from              to             

Commission File Number 1-3523

WESTAR ENERGY, INC.

(Exact name of registrant as specified in its charter)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer (as defined in Rule 12b-2 of the Act). Check one:

Large accelerated filer  x    Accelerated filer  ¨    Non-accelerated filer  ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.

TABLE OF CONTENTS

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FORWARD-LOOKING STATEMENTS

Certain matters discussed in this Form 10-Q are “forward-looking statements.” The Private Securities Litigation Reform Act of 1995 has established that these statements qualify for safe harbors from liability. Forward-looking statements may include words like we “believe,” “anticipate,” “target,” “expect,” “pro forma,” “estimate,” “intend” and words of similar meaning. Forward-looking statements describe our future plans, objectives, expectations or goals. Such statements address future events and conditions concerning matters such as, but not limited to:

What happens in each case could vary materially from what we expect because of such things as:

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These lists are not all-inclusive because it is not possible to predict all factors. This report should be read in its entirety and in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2006. No one section of this report deals with all aspects of the subject matter and additional information on some matters that could impact our operations and financial results may be included in our Annual Report on Form 10-K for the year ended December 31, 2006. Any forward-looking statement speaks only as of the date such statement was made, and we are not obligated to update any forward-looking statement to reflect events or circumstances after the date on which such statement was made except as required by applicable laws or regulations.

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PART I. FINANCIAL INFORMATION

WESTAR ENERGY, INC.

CONSOLIDATED BALANCE SHEETS

(Dollars in Thousands)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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WESTAR ENERGY, INC.

CONSOLIDATED STATEMENTS OF INCOME

(Dollars in Thousands, Except Per Share Amounts)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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WESTAR ENERGY, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Dollars in Thousands)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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WESTAR ENERGY, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Dollars in Thousands)

(Unaudited)

The accompanying notes are an integral part of these condensed consolidated financial statements.

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WESTAR ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. DESCRIPTION OF BUSINESS

We are the largest electric utility in Kansas. Unless the context otherwise indicates, all references in this quarterly report on Form 10-Q to “the company,” “we,” “us,” “our” and similar words are to Westar Energy, Inc. and its consolidated subsidiaries. The term “Westar Energy” refers to Westar Energy, Inc., a Kansas corporation incorporated in 1924, alone and not together with its consolidated subsidiaries.

We provide electric generation, transmission and distribution services to approximately 672,000 customers in Kansas. Westar Energy provides these services in central and northeastern Kansas, including the cities of Topeka, Lawrence, Manhattan, Salina and Hutchinson. Kansas Gas and Electric Company (KGE), Westar Energy’s wholly owned subsidiary, provides these services in south-central and southeastern Kansas, including the city of Wichita. KGE owns a 47% interest in the Wolf Creek Generating Station (Wolf Creek), a nuclear power plant located near Burlington, Kansas. Both Westar Energy and KGE conduct business using the name Westar Energy.

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

We prepare our condensed consolidated financial statements in accordance with generally accepted accounting principles (GAAP) for the United States of America for interim financial information and in accordance with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, certain information and footnote disclosures normally included in financial statements presented in accordance with GAAP have been condensed or omitted. In our opinion, all adjustments, consisting only of normal recurring adjustments considered necessary for a fair presentation of the financial statements, have been included.

The accompanying condensed consolidated financial statements and notes should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2006 (2006 Form
10-K).

Use of Management’s Estimates

When we prepare our consolidated financial statements, we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosure of contingent assets and liabilities at the date of our consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. We evaluate our estimates on an on-going basis, including those related to bad debts, inventories, valuation of commodity contracts, depreciation, unbilled revenue, investments, valuation of our energy marketing portfolio, intangible assets, fuel costs billed under the terms of our retail energy cost adjustment (RECA), income taxes, pension and other post-retirement and post-employment benefits, our asset retirement obligations including decommissioning of Wolf Creek, environmental issues, contingencies and litigation. Actual results may differ from those estimates under different assumptions or conditions. The results of operations for the three months ended March 31, 2007 are not necessarily indicative of the results to be expected for the full year.

Accounts Receivable

Receivables, which consist primarily of trade accounts receivable, were reduced by allowances for doubtful accounts of $6.7 million at March 31, 2007, and $6.3 million at December 31, 2006.

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Dilutive Shares

We report basic earnings per share applicable to equivalent common stock based on the weighted average number of common shares outstanding and shares issuable in connection with vested restricted share units (RSUs) during the period reported. Diluted earnings per share include the effects of potential issuances of common shares resulting from the assumed vesting of all outstanding RSUs and the exercise of all outstanding stock options issued pursuant to the terms of our stock-based compensation plans. The dilutive effect of shares issuable under our stock-based compensation plans is computed using the treasury stock method.

The following table reconciles the weighted average number of equivalent common shares outstanding used to compute basic and diluted earnings per share.

Supplemental Cash Flow Information

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3. DEBT FINANCINGS

On February 2, 2007, Westar Energy exercised its right to request a one year maturity extension for its revolving credit facility dated March 17, 2006. Effective March 16, 2007, $480.0 million of the revolving credit facility matures on March 17, 2012. The remaining $20.0 million matures on March 17, 2011. So long as there is no default or event of default under the revolving credit facility, Westar Energy may elect to extend the term of the credit facility for up to an additional year, subject to lender participation. The facility allows us to borrow up to an aggregate amount of $500.0 million, including letters of credit up to a maximum aggregate amount of $150.0 million. We may elect, subject to Federal Energy Regulatory Commission (FERC) approval, to increase the aggregate amount of borrowings under the facility to $750.0 million by increasing the commitment of one or more lenders who have agreed to such increase, or by adding one or more new lenders with the consent of the Administrative Agent and any letter of credit issuing bank, which will not be unreasonably withheld, so long as there is no default or event of default under the revolving credit facility.

4. INCOME TAXES AND TAXES OTHER THAN INCOME TAXES

We recorded income tax expense of approximately $12.0 million with an effective income tax rate of 28% for the three months ended March 31, 2007, and $8.7 million with an effective income tax rate of 25% for the same period of 2006. The increase in the effective tax rate is due to decreases in the tax benefits from corporate-owned life insurance (COLI) and decreases in the utilization of previously unrecognized capital loss carryforwards in 2007 when compared to 2006.

We file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. The income tax returns we filed will likely be audited by the Internal Revenue Service (IRS) or other taxing authorities. However, the timing of the resolution of these audits is uncertain.

We adopted the provisions of Financial Accounting Standards Board (FASB) Interpretation No. (FIN) 48, “Accounting for Uncertainty in Income Taxes—an interpretation of FASB Statement No. 109,” as of January 1, 2007. The cumulative effect of adopting FIN 48 was an increase of $10.5 million to the January 1, 2007 retained earnings balance.

At January 1, 2007, the amount of unrecognized tax benefits was $50.2 million. Included in this unrecognized tax benefits balance was $31.8 million (net of tax), which if recognized, would favorably impact our effective income tax rate. There were no significant changes to any of the unrecognized tax benefit balances during the first quarter of 2007 and we do not expect any significant increases or decreases to the total amount of unrecognized tax benefits within the next 12 months.

With the adoption of FIN 48, we changed our practice of including interest related to income tax uncertainties in income tax expense. Effective January 1, 2007, interest is classified as interest expense and accrued interest liability. We had $20.0 million and $18.9 million accrued for interest related to income tax liabilities at March 31, 2007 and January 1, 2007, respectively. There were no penalties accrued at March 31, 2007 or January 1, 2007.

With few exceptions, we are not subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 1995. Our federal income tax returns for the years 1995 though 2002 have been examined by the IRS and the unagreed issues are pending review before the IRS Appeals and the Joint Committee on Taxation. Our 2003 and 2004 federal income tax returns are currently under IRS examination. Our 2005 federal income tax return is subject to audit by the IRS. We have agreed to extend the statue of limitations for tax years 1995 through 2002 until December 31, 2007 and the statute of limitations for tax year 2003 until June 30, 2008. We do not believe that the outcome of any examination will have a material impact on our consolidated financial statements.

As of March 31, 2007 and December 31, 2006, we also had a reserve of $5.6 million and $6.9 million, respectively, for probable assessments of taxes other than income taxes.

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5. COMMITMENTS AND CONTINGENCIES

Environmental Projects

Kansas City Power & Light Company began updating or installing additional equipment related to emissions controls at La Cygne Generating Station in 2005. We will continue to incur costs through the scheduled completion in 2009. We anticipate that our share of these capital costs will be approximately $232.5 million. Additionally, we have identified the potential for up to $512.4 million of expenditures at other power plants for other environmental projects during approximately the next seven to ten years. This cost could increase depending on the resolution of the Environmental Protection Agency (EPA) New Source Review described below. In addition to the capital investment, were we to install such equipment, we anticipate that we would incur significant annual expense to operate and maintain the equipment and the operation of the equipment would reduce net production from our plants. The environmental cost recovery rider (ECRR) approved in the December 28, 2005 KCC Order allows for the timely inclusion in rates of capital expenditures tied directly to environmental improvements required by the Clean Air Act. However, increased operating and maintenance costs, other than expenses related to production-related consumables, such as limestone, can be recovered only through a change in base rates following a rate review.

The degree to which we will need to reduce emissions and the timing of when such emissions controls may be required is uncertain. Both the timing and the nature of required investments depend on specific outcomes that result from interpretation of regulations, new regulations, legislation, and the resolution of the EPA New Source Review described below. In addition, the availability of equipment and contractors can affect the timing and ultimate cost of the equipment. Whether through base rates or the ECRR, we expect to recover such costs through the rates we charge our customers.

EPA New Source Review

Under Section 114(a) of the Clean Air Act (Section 114), the EPA is conducting investigations nationwide to determine whether modifications at coal-fired power plants are subject to New Source Review requirements or New Source Performance Standards. These investigations focus on whether projects at coal-fired plants were routine maintenance or whether the projects were substantial modifications that could reasonably have been expected to result in a significant net increase in emissions. The Clean Air Act requires companies to obtain permits and, if necessary, install control equipment to remove emissions when making a major modification or a change in operation if either is expected to cause a significant net increase in emissions.

The EPA requested information from us under Section 114 regarding projects and maintenance activities that have been conducted since 1980 at three coal-fired plants we operate. On January 22, 2004, the EPA notified us that certain projects completed at Jeffrey Energy Center violated pre-construction permitting requirements of the Clean Air Act.

We are in discussions with the EPA concerning this matter in an attempt to reach a settlement. We expect that any settlement with the EPA could require us to update or install emissions controls at Jeffrey Energy Center. Additionally, we might be required to update or install emissions controls at our other coal-fired plants, pay fines or penalties, or take other remedial action. Together, these costs could be material. The EPA has informed us that it has referred this matter to the Department of Justice (DOJ) for the DOJ to consider whether to pursue an enforcement action in federal district court. We believe that costs related to updating or installing emissions controls would qualify for recovery through the ECRR. If we were to reach a settlement with the EPA, we may be assessed a penalty. The penalty could be material and may not be recovered in rates. We are not able to estimate the possible loss or range of loss at this time.

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Manufactured Gas Sites

We have been associated with a number of former manufactured gas sites located in Kansas and Missouri. We and the Kansas Department of Health and Environment (KDHE) entered into a consent agreement in 1994 governing all future work at the Kansas sites. Under the terms of the consent agreement, we agreed to investigate and, if necessary, remediate these sites. Pursuant to an environmental indemnity agreement with ONEOK, Inc. (ONEOK), the current owner of some of the sites, our liability for twelve of the sites is limited. Of those twelve sites, ONEOK assumed total liability for remediation of seven sites and we share liability for remediation with ONEOK for five sites. Our total liability for the five shared sites is capped at $3.8 million. We have sole responsibility for remediation with respect to three sites.

Our liability for our former manufactured gas sites in Missouri is limited by an environmental indemnity agreement with Southern Union Company, which bought all of the Missouri manufactured gas sites. According to the terms of the agreement, our future liability for these sites is capped at $7.5 million.

6. LEGAL PROCEEDINGS

On June 13, 2003, we filed a demand for arbitration with the American Arbitration Association asserting claims against David C. Wittig, our former president, chief executive officer and chairman, and Douglas T. Lake, our former executive vice president, chief strategic officer and member of the board, arising out of their previous employment with us. Mr. Wittig and Mr. Lake have filed counterclaims against us in the arbitration alleging substantial damages related to the termination of their employment and the publication of the report of the special committee of our board of directors. We intend to vigorously defend against these claims. The arbitration has been stayed pending final resolution of the criminal charges filed by the United States Attorney’s Office against Mr. Wittig and Mr. Lake in U.S. District Court in the District of Kansas. On September 12, 2005, the jury convicted Mr. Wittig and Mr. Lake on the charges relevant to each of them. On January 5, 2007, these convictions were overturned by U.S. Tenth Circuit Court of Appeals following appeals by Mr. Wittig and Mr. Lake. On April 30, 2007, the government announced that it had decided to retry certain charges against Mr. Wittig and Mr. Lake. The arbitration remains stayed. We are unable to predict the ultimate impact of this matter on our consolidated financial statements.

We and our subsidiaries are involved in various other legal, environmental and regulatory proceedings. We believe that adequate provisions have been made and accordingly believe that the ultimate disposition of such matters will not have a material adverse effect on our consolidated financial statements.

See also Note 5 for discussion of alleged violations of the Clean Air Act, Note 7 for ongoing investigations and Note 8 for discussion regarding potential liabilities to Mr. Wittig and Mr. Lake.

7. ONGOING INVESTIGATIONS

Grand Jury Subpoena

On September 17, 2002, we were served with a federal grand jury subpoena by the United States Attorney’s Office in Topeka, Kansas, requesting information concerning the use of aircraft and our annual shareholder meetings. Subsequently, the United States Attorney’s Office served additional subpoenas on us and certain of our employees requesting further information concerning the use of our aircraft; executive compensation arrangements with Mr. Wittig, Mr. Lake and other former and present officers; the proposed rights offering of Westar Industries, Inc. stock that was abandoned; and the company in general. We provided information in response to these requests and we cooperated fully in the investigation. We have not been informed that we are a target of the investigation. On December 4, 2003, Mr. Wittig and Mr. Lake were indicted by the federal grand jury on conspiracy, fraud and other criminal charges related to their actions while serving as our officers. For additional information regarding the jury trial of Mr. Wittig and Mr. Lake, see Note 8, “Potential Liabilities to David C. Wittig and Douglas T. Lake.”

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Department of Labor Investigation

On February 1, 2005, we received a subpoena from the Department of Labor seeking documents related to our Employees’

401(k) Savings Plan and our defined pension benefit plan. We have provided information to the Department of Labor pursuant to the subpoena and subsequent inquiries. At this time, we do not know the specific purpose of the investigation and we are unable to predict the ultimate outcome of the investigation or its impact on us.

8. POTENTIAL LIABILITIES TO DAVID C. WITTIG AND DOUGLAS T. LAKE

David C. Wittig, our former chairman of the board, president and chief executive officer, resigned from all of his positions with us and our affiliates on November 22, 2002. On May 7, 2003, our board of directors determined that the employment of Mr. Wittig was terminated as of November 22, 2002 for cause. Douglas T. Lake, our former executive vice president, chief strategic officer and member of the board, was placed on administrative leave from all of his positions with us and our affiliates on December 6, 2002. On June 12, 2003, our board of directors terminated the employment of Mr. Lake for cause.

On June 13, 2003, we filed a demand for arbitration with the American Arbitration Association asserting claims against Mr. Wittig and Mr. Lake arising out of their previous employment with us. Mr. Wittig and Mr. Lake have filed counterclaims against us in the arbitration alleging substantial damages related to the termination of their employment and the publication of the report of the special committee of our board of directors. We intend to vigorously defend against these claims. The arbitration has been stayed pending final resolution of criminal charges filed by the United States Attorney’s Office against Mr. Wittig and Mr. Lake in U.S. District Court in the District of Kansas. On September 12, 2005, the jury convicted Mr. Wittig and Mr. Lake on the charges relevant to each of them. On January 5, 2007, these convictions were overturned by U.S. Tenth Circuit Court of Appeals following appeals by Mr. Wittig and Mr. Lake. On April 30, 2007, the government announced that it had decided to retry certain charges against Mr. Wittig and Mr. Lake. The arbitration remains stayed. We are unable to predict the ultimate impact of this matter on our consolidated financial statements.

As of March 31, 2007, we had accrued liabilities totaling approximately $75.4 million for compensation not yet paid to Mr. Wittig and Mr. Lake under various agreements and plans. The compensation includes RSU awards, deferred vested shares, deferred RSU awards, deferred vested stock for compensation, executive salary continuation plan benefits, potential obligations related to the cash received for Guardian International, Inc. (Guardian) preferred stock, and, in the case of Mr. Wittig, benefits arising from a split dollar life insurance agreement. The amount of our obligation to Mr. Wittig related to a split dollar life insurance agreement is subject to adjustment at the end of each quarter based on the total return to our shareholders from the date of that agreement. The total return considers the change in stock price and accumulated dividends. These compensation-related accruals are included in long-term liabilities on the consolidated balance sheets with a portion recorded as a component of paid in capital. The amount accrued will increase annually as it relates to future dividends on deferred RSU awards and increases in amounts that may be due under the executive salary continuation plan.

In addition, through March 31, 2007 we have accrued $10.0 million for legal fees and expenses incurred by Mr. Wittig and Mr. Lake that are recorded in accounts payable on our consolidated balance sheets. These legal fees and expenses were incurred by Mr. Wittig and Mr. Lake in the defense of the criminal charges filed by the United States Attorney’s Office and the subsequent appeal of convictions on these charges. On January 5, 2007, the convictions were overturned by the U.S. Tenth Circuit Court of Appeals. We may incur substantial additional expenses for legal fees and expenses incurred by Mr. Wittig and Mr. Lake as a result of the decision by the United States Attorney’s Office to retry certain charges against Mr. Wittig and Mr. Lake and developments in the arbitration. We have filed lawsuits against Mr. Wittig and Mr. Lake claiming that the legal fees and expenses they have incurred, which we have advanced or for which they seek advancement in the defense of the criminal charges, are unreasonable and excessive. We have asked the court to determine the amount of the legal fees and expenses that were reasonably incurred and which we have an obligation to advance. We are unable to estimate the amount of the legal fees and expenses that will be incurred by Mr. Wittig and Mr. Lake for which we may be ultimately responsible.

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The jury in the trial of Mr. Wittig and Mr. Lake also determined that Mr. Wittig and Mr. Lake should forfeit to the United States certain property that it determined was derived from their criminal conduct. We subsequently filed petitions asserting a superior interest in certain forfeited property. The court subsequently entered final orders of forfeiture awarding us certain property forfeited by Mr. Wittig and Mr. Lake. The property awarded to us consists substantially of compensation and benefits that we were seeking to avoid paying in the arbitration proceeding referenced above. Following appeal, the Tenth Circuit Court of Appeals also overturned the forfeiture orders.

9. INTERIM PENSION AND POST-RETIREMENT BENEFIT DISCLOSURE

The following table summarizes the net periodic costs for our pension and post-retirement benefit plans.

10. WOLF CREEK INTERIM PENSION AND POST-RETIREMENT BENEFIT DISCLOSURE

As a co-owner of Wolf Creek, KGE is indirectly responsible for 47% of the liabilities and expenses associated with the Wolf Creek pension and post-retirement plans. The following table summarizes the net periodic costs for KGE’s 47% share of the Wolf Creek pension and post-retirement benefit plans.

In January 2007 Wolf Creek Nuclear Operating Corporation (WCNOC) offered a selective retirement incentive to 141 employees of whom 61 accepted. The incentive increased the pension benefit for eligible employees. This resulted in $1.5 million in additional pension benefits and $0.3 million in additional post-retirement benefits for the three months ended March 31, 2007.

11. SUBSEQUENT EVENTS

Common Stock Offering

On April 12, 2007, we entered into a Sales Agency Financing Agreement with BNY Capital Markets, Inc. (BNYCMI). Under the terms of the agreement, we may offer and sell shares of our common stock from time to time through BNYCMI, as agent for the offer and sale of shares, up to an aggregate of $100,000,000, for a period of no more than three years.

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The common stock may be offered in one or more selling periods, none of which will exceed 20 trading days. We specify to BNYCMI the aggregate selling price of common stock to be sold during each selling period, which may not exceed $50,000,000 without BNYCMI’s prior written consent. We also specify a minimum selling price. We will pay BNYCMI a commission equal to 1% of the sales price of all shares it sells under the agreement.

We will issue the common stock pursuant to a registration statement previously filed with the Securities and Exchange Commission (SEC) on Form S-3. As of May 3, 2007, we sold 1,568,767 shares for $43.5 million, net of fees, which have been used to reduce borrowings under the revolving credit facility or for other working capital needs.

Purchase of Leasehold Interest in Jeffrey Energy Center

On April 1, 2007, we completed the purchase of Aquila, Inc.’s 8% leasehold interest in Jeffrey Energy Center for $22.3 million and assumed their related lease obligations of $98.5 million through January 3, 2019. Included in this purchase were Aquila’s materials and supplies, inventory and leasehold improvements related to its 8% interest in the plant. Related to this transaction, we entered into a long-term sale agreement with Mid-Kansas Electric Company, LLC (MKEC) pursuant to which we provide MKEC with the capacity and energy from the 8% leasehold interest in Jeffrey Energy Center through January 3, 2019.

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INTRODUCTION

We are the largest electric utility in Kansas. We produce, transmit and sell electricity at retail in Kansas and at wholesale in a multi-state region in the central United States under the regulation of the Kansas Corporation Commission (KCC) and the FERC.

In Management’s Discussion and Analysis, we discuss our general financial condition, significant changes that occurred during 2007, and our operating results for the three months ended March 31, 2007 and 2006. As you read Management’s Discussion and Analysis, please refer to our condensed consolidated financial statements and the accompanying notes, which contain our operating results.

CRITICAL ACCOUNTING ESTIMATES

Our discussion and analysis of financial condition and results of operations are based on our consolidated financial statements, which have been prepared in conformity with GAAP. Note 2 of the Notes to Condensed Consolidated Financial Statements, “Summary of Significant Accounting Policies,” contains a summary of our significant accounting policies, many of which require the use of estimates and assumptions by management. The policies highlighted in our 2006 Form 10-K have an impact on our reported results that may be material due to the levels of judgment and subjectivity necessary to account for uncertain matters or their susceptibility to change.

There have been no material changes to our critical accounting estimates from the information provided in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, included in our 2006 Form 10-K, except as follows:

Uncertainty in Income Taxes

We account for uncertainty in income taxes in accordance with FIN 48 as of January 1, 2007. The application of income tax law is inherently complex. Laws and regulations in this area are voluminous and are often ambiguous. As such, we are required to make many subjective assumptions and judgments regarding our income tax exposures. Interpretations of and guidance surrounding income tax laws and regulations change over time. As such, changes in our subjective assumptions and judgments can materially affect amounts recognized in the consolidated financial statements. See Note 4 of the Notes to Condensed Consolidated Financial Statements, “Income Taxes and Taxes Other Than Income Taxes,” for additional detail of our uncertainty in income taxes.

OPERATING RESULTS

We evaluate overall operating results principally based on earnings per share. We have various classifications of sales, defined as follows:

Retail: Sales of energy made to residential, commercial and industrial customers.

Other retail: Sales of energy for lighting public streets and highways, net of revenue subject to refund.

Tariff-based wholesale: Sales of energy to electric cooperatives, municipalities and other electric utilities, the rates for which are generally based on cost as prescribed by FERC tariffs. This category also includes changes in valuations of contracts that have yet to settle.

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Market-based wholesale: Sales of energy to wholesale customers, the rates for which are generally based on prevailing market prices as allowed by our FERC approved market-based tariff, or where not permitted, pricing is based on incremental cost plus a permitted margin.

Energy marketing: Includes: (i) transactions based on market prices with volumes not related to the production of our generating assets or the demand of our retail customers; (ii) financially settled products and physical transactions sourced outside our control area; (iii) fees we earn for marketing services that we provide for third parties; and (iv) changes in valuations for contracts that have yet to settle that are not recorded in tariff- or market-based wholesale revenues.

Transmission: Reflects transmission revenues, including those based on a tariff with the Southwest Power Pool (SPP).

Other: Miscellaneous electric revenues including ancillary service revenues and rent from electric property leased to others.

Regulated retail electric utility sales are significantly impacted by such things as rate regulation, customer demand, the economy of our service area and competitive forces. Our wholesale sales are impacted by, among other factors, demand, cost and availability of fuel and purchased power, price volatility, available generation capacity and transmission availability. Changing weather affects the amount of electricity our customers use. Hot summer temperatures and cold winter temperatures prompt more demand, especially among our residential customers. Mild weather serves to reduce customer demand.

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Three Months Ended March 31, 2007 Compared to Three Months Ended March 31, 2006

Below we discuss our operating results for the three months ended March 31, 2007 compared to the results for the three months ended March 31, 2006. Changes in results of operations are as follows.

The following table reflects changes in electric sales volumes, as measured by thousands of megawatt hours (MWh) of electricity. No sales volumes are shown for energy marketing, transmission or other. Energy marketing activities are unrelated to electricity we generate.

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Retail sales were higher for the three months ended March 31, 2007 due principally to colder weather, which stimulates the demand for electricity. When measured by heating degree days, the weather during the three months ended March 31, 2007 was 15% colder than the same period last year. We measure heating degree days at weather stations we believe to be generally reflective of conditions in our service territory. The change in other retail sales reflects an $11.1 million increase in RECA related revenues, offset by a $7.4 million decrease that resulted primarily from refund obligations related to the remand of the December 28, 2005 KCC Order and decreases in the estimated property tax surcharge revenue.

Market-based wholesale sales and sales volumes were higher than last year, due principally to coal conservation efforts that occurred last year that did not occur this year. The average price per MWh for these sales, however, was about 20% lower than the same period last year.

The decrease in energy marketing is a result of a decrease in valuations of contracts receiving mark to market treatment in 2007, as compared to an increase in 2006. Additionally less favorable market conditions relative to the same period last year reduced profit opportunities.

The change in fuel and purchased power expense resulted from a number of factors, including: the volumes of power we produced and purchased, prevailing market prices and contract provisions that allow for price changes. We used approximately 23% more fuel in our generating plants this year than during the three months ended March 31, 2006, due primarily to our not having coal conservation efforts in place as we did last year. This resulted in $20.0 million higher fuel expense during the three months ended March 31, 2007 as compared with the same period in 2006. Partially offsetting the increase in fuel expense was a $9.9 million decrease in purchased power expense. As we produced more energy from our own plants this year, it also meant that we relied on wholesale purchases to a lesser extent. Our purchased volumes were down 32% when compared with the same period in 2006.

Operating and maintenance expense decreased $2.9 million when compared to last year. This was due primarily to major maintenance at one of our power plants last year, that we did not repeat this year.

The change in selling, general and administrative expense was due primarily to a $3.8 million increase in pension and benefit costs. The largest component of this increase was $1.8 million of expense associated with a retirement incentive program offered to WCNOC employees. Partially offsetting the increase were reduced legal fees associated with matters having to deal with former management.

Other income decreased compared to last year. This was due primarily to our having received $9.6 million in proceeds from COLI last year.

The effective income tax rate was 28% for the three months ended March 31, 2007 and 25% for the same period of 2006. The increase in the effective tax rate is due to decreases in the tax benefits from COLI and decreases in the utilization of previously unrecognized capital loss carryforwards in 2007 when compared to 2006.

FINANCIAL CONDITION

Below we discuss significant balance sheet changes as of March 31, 2007 compared to December 31, 2006.

The fair market value of energy marketing contracts decreased $10.0 million to a level of $10.6 million at March 31, 2007. This was due primarily to positions that have settled.

Other current assets increased $22.9 million. This was due to our having escrowed funds in advance of the closing on the purchase of Aquila, Inc.’s 8% leasehold interest in Jeffrey Energy Center.

The increase in short-term debt was due to increased borrowings under the Westar Energy revolving credit facility. The borrowings were used to pay higher construction expenditures and to fund an escrow account needed to purchase Aquila’s 8% leasehold interest in Jeffrey Energy Center, a transaction that closed subsequent to the end of the first quarter.

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Regulatory assets, net of regulatory liabilities, decreased to $446.3 million at March 31, 2007, from $476.0 million at December 31, 2006. Total regulatory assets decreased $37.0 million due primarily to a $22.5 million decrease in deferred future income taxes. Total regulatory liabilities decreased $7.3 million due primarily to a $12.7 million decrease in revenue subject to refund related to amounts collected under the RECA.

LIQUIDITY AND CAPITAL RESOURCES

Overview

We believe we will have sufficient cash to fund future operations, pay debt maturities and dividends from a combination of cash on hand, cash flows from operations and available borrowing capacity. Our available sources of funds include: cash, Westar Energy’s revolving credit facility and access to capital markets. Uncertainties affecting our ability to meet these cash requirements include, among others: factors affecting sales described in “– Operating Results” above, economic conditions, regulatory actions, conditions in the capital markets and compliance with environmental regulations.

Capital Resources

As of March 31, 2007, Westar Energy had a $500.0 million revolving credit facility against which $239.0 million had been borrowed and $25.5 million of letters of credit had been issued.

Common Stock Offering

On April 12, 2007, we entered into a Sales Agency Financing Agreement with BNYCMI. Under the terms of the agreement, we may offer and sell shares of our common stock from time to time through BNYCMI, as agent for the offer and sale of shares, up to an aggregate of $100,000,000, for a period of no more than three years.

The common stock may be offered in one or more selling periods, none of which will exceed 20 trading days. We specify to BNYCMI the aggregate selling price of common stock to be sold during each selling period, which may not exceed $50,000,000 without BNYCMI’s prior written consent. We also specify a minimum selling price. We will pay BNYCMI a commission equal to 1% of the sales price of all shares it sells under the agreement.

We will issue the common stock pursuant to a registration statement previously filed with the SEC on Form S-3. As of May 3, 2007, we sold 1,568,767 shares for $43.5 million, net of fees, which have been used to reduce borrowings under the revolving credit facility or for other working capital needs.

Debt Financings

On February 2, 2007, Westar Energy exercised its right to request a one year maturity extension for its revolving credit facility dated March 17, 2006. Effective March 16, 2007, $480.0 million of the revolving credit facility matures on March 17, 2012. The remaining $20.0 million matures on March 17, 2011. So long as there is no default or event of default under the revolving credit facility, Westar Energy may elect to extend the term of the credit facility for up to an additional year, subject to lender participation. The facility allows us to borrow up to an aggregate amount of $500.0 million, including letters of credit up to a maximum aggregate amount of $150.0 million. We may elect, subject to FERC approval, to increase the aggregate amount of borrowings under the facility to $750.0 million by increasing the commitment of one or more lenders who have agreed to such increase, or by adding one or more new lenders with the consent of the Administrative Agent and any letter of credit issuing bank, which will not be unreasonably withheld, so long as there is no default or event of default under the revolving credit facility.

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Cash Flows from (used in) Operating Activities

Operating activities provided $60.2 million of cash in the three months ended March 31, 2007 compared with cash used in operating activities of $18.5 million during the same period of 2006. The increase in cash flows from operating activities for the three months ended March 31, 2007, compared to the same period of 2006, was due principally to the termination of our accounts receivables sales program, a $14.0 million decrease in the payment of income taxes, a $9.0 million decrease in voluntary contributions to our pension trust and a $2.8 million decrease in interest paid. During the three months ended March 31, 2006, we used approximately $65.0 million related to the termination of our accounts receivables sales program and paid $10.0 million in customer rebates.

Cash Flows used in Investing Activities

The utility business is capital intensive and requires significant ongoing investment in plant. We spent $106.2 million in the three months ended March 31, 2007 and $63.3 million in the same period of 2006 on additions to utility property, plant and equipment. During the three months ended March 31, 2007, we used $22.3 million for a deposit in escrow related to the purchase of Aquila, Inc.’s 8% leasehold interest in Jeffrey Energy Center. During the three months ended March 31, 2006, we received $5.9 million from investments in COLI and $23.2 million from investments in Guardian.

Cash Flows from Financing Activities

Financing activities in the three months ended March 31, 2007 provided $57.6 million of cash compared to $18.0 million in the same period of 2006. In the three months ended March 31, 2007, short-term debt provided $79.0 million and we used cash to pay dividends. In the three months ended March 31, 2006, short-term debt provided $143.0 million and we used cash primarily to retire long-term debt, repay COLI borrowings and pay dividends.

OFF-BALANCE SHEET ARRANGEMENTS

From December 31, 2006 through March 31, 2007, there have been no material changes in our off-balance sheet arrangements. For additional information, see our 2006 Form 10-K.

CONTRACTUAL OBLIGATIONS AND COMMERCIAL COMMITMENTS

Contractual Obligations

On April 1, 2007, we completed the purchase of Aquila, Inc.’s 8% leasehold interest in Jeffrey Energy Center for $22.3 million and assumed their related lease obligations. Included in this purchase were Aquila’s materials and supplies, inventory and leasehold improvements related to its 8% interest in the plant. Related to this transaction, we entered into a long-term sale agreement with MKEC pursuant to which we provide MKEC with the capacity and energy from the 8% leasehold interest in Jeffrey Energy Center through January 3, 2019. The following table summarizes our projected future lease payment obligations related to this transaction. There were no other material changes in our contractual obligations from December 31, 2006 through March 31, 2007. For additional information, see our 2006 Form 10-K.

We have not included any amounts in the table related to payments of uncertain tax liabilities as of March 31, 2007 because we cannot reasonably estimate when payment of uncertain tax liabilities will occur.

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Commercial Commitments

From December 31, 2006 through March 31, 2007, there have been no material changes outside the ordinary course of business in our commercial commitments. For additional information, see our 2006 Form 10-K.

OTHER INFORMATION

Pension Obligation

On March 20, 2007, we made a voluntary contribution to the Westar Energy pension trust of $11.8 million.

Fair Value of Energy Marketing Contracts

The tables below show the fair value of energy marketing and fuel contracts that were outstanding as of March 31, 2007, their sources and maturity periods.

The sources of the fair values of the financial instruments related to these contracts as of March 31, 2007 are summarized in the following table.

New Accounting Pronouncements

FIN 48 – Accounting for Uncertainty in Income Taxes

We adopted the provisions of FIN 48 as of January 1, 2007. The cumulative effect of adopting FIN 48 was an increase of $10.5 million to the January 1, 2007 retained earnings balance.

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We are exposed to market risk, including changes in commodity prices, equity instrument investment prices and interest rates. From December 31, 2006 to March 31, 2007, no significant changes have occurred in our exposure to market risk. For additional information, see our 2006 Form 10-K, “Item 7A. Quantitative and Qualitative Disclosures About Market Risk.”

Under the supervision and with the participation of our management, including our chief executive officer and our chief financial officer, we have evaluated the effectiveness of the design and operation of our disclosure controls and procedures as defined in Rule 13a-15(e) of the Securities Exchange Act of 1934. These controls and procedures are designed to ensure that material information relating to the company and its subsidiaries is communicated to the chief executive officer and the chief financial officer. Based on that evaluation, our chief executive officer and our chief financial officer concluded that, as of March 31, 2007, our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in reports that we file or submit under the Securities Exchange Act of 1934 is accumulated and communicated to the chief executive officer and the chief financial officer, and recorded, processed, summarized and reported within the time periods specified in Securities and Exchange Commission rules and forms.

There were no changes in our internal control over financial reporting during the three months ended March 31, 2007, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Information on other legal proceedings is set forth in Notes 5, 6, 7 and 8 of the Notes to Condensed Consolidated Financial Statements, “Commitments and Contingencies – EPA New Source Review,” “Legal Proceedings,” “On-going Investigations” and “Potential Liabilities to David C. Wittig and Douglas T. Lake,” respectively, which are incorporated herein by reference.

Like other companies in our industry, our consolidated financial results will be impacted by weather, the economy of our service territory and the energy use of our customers. The value of our common stock and our creditworthiness will be affected by national and international macroeconomic trends, general market conditions and the expectations of the investment community, all of which are largely beyond our control. In addition, the following statement highlights our risk factor related to the Clean Air Act and other environmental regulations that may affect our consolidated financial condition and results of operations. There were no other material changes in our risk factors from December 31, 2006 through March 31, 2007. For additional information, see our 2006 Form 10-K.

We May Have Material Financial Exposure Under the Clean Air Act and Other Environmental Regulations

On January 22, 2004, the EPA notified us that certain projects completed at Jeffrey Energy Center violated pre-construction permitting requirements under the Clean Air Act. This notification was delivered as part of an investigation by the EPA regarding maintenance activities that have been conducted since 1980 at Jeffrey Energy Center. The EPA has informed us that it has referred this matter to the DOJ for it to consider whether to pursue an enforcement action in federal district court. The remedy for a violation could include fines and penalties and an order to install new emission control systems at Jeffrey Energy Center and at certain of our other coal-fired power plants, the associated cost of which could be material.

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Our activities are subject to environmental regulation by federal, state, and local governmental authorities. These regulations generally involve the use of water, discharges of effluents into the water, emissions into the air, the handling, storage and use of hazardous substances, and waste handling, remediation and disposal, among others. Congress or the State of Kansas may enact legislation and the EPA or the State of Kansas may propose new regulations or change existing regulations that could require us to reduce certain emissions at our plants. New or changed laws and regulations may result from the increasing national and international concern about possible global warming caused by the atmospheric release of greenhouse gases by industrial and other sources, including the utility industry. New or changed laws and regulations could require us to install costly equipment, increase our operating expense, reduce production from our plants or take other actions we are unable to identify at this time.

The degree to which we may need to reduce emissions and the timing of when such emissions control equipment may be required is uncertain. Both the timing and the nature of required investments depend on specific outcomes that result from interpretation of regulations, new regulations, legislation, and the resolution of the EPA notice of violation described above. Although we expect to recover in our rates the costs that we incur to comply with environmental regulations, we can provide no assurance that we will be able to fully and timely recover such costs. Failure to recover these associated costs could have a material adverse effect on our consolidated financial statements.

None

None

None

None

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Exhibit 31(a)

WESTAR ENERGY, INC.

CHIEF EXECUTIVE OFFICER

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James S. Haines, Jr., certify that:

Exhibit 31(b)

WESTAR ENERGY, INC.

CHIEF FINANCIAL OFFICER

CERTIFICATION PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mark A. Ruelle, certify that:

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906

OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Westar Energy, Inc. (the Company) on Form 10-Q for the quarter ended March 31, 2007 (the Report), which this certification accompanies, James S. Haines, Jr., in my capacity as Director and Chief Executive Officer of the Company, and Mark A. Ruelle, in my capacity as Executive Vice President and Chief Financial Officer of the Company, certify that the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 and that information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.