QuickLinks -- Click here to rapidly navigate through this document

   
Registration Nos. 333-_______



SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549


FORM S-3
REGISTRATION STATEMENT
UNDER
THE SECURITIES ACT OF 1933


OGE Energy Corp.
(Exact name of registrant as specified in its charter)

OKLAHOMA
(State or other jurisdiction of
incorporation or organization)

 

73-1481638
(I.R.S. Employer
Identification Number)

321 N. Harvey, P.O. Box 321, Oklahoma City, Oklahoma 73101-0321 (405-553-3000)
(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices)

JAMES R. HATFIELD
Senior Vice President and Chief Financial Officer
OGE Energy Corp.
321 N. Harvey, P.O. Box 321
Oklahoma City, Oklahoma 73101-0321
(405) 553-3000
(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copy to:

ROBERT J. JOSEPH
Jones Day
77 West Wacker
Chicago, Illinois 60601
(312) 269-4176

 

JONATHAN A. KOFF
Chapman and Cutler LLP
111 West Monroe Street
Chicago, Illinois 60603
(312) 845-3000

Approximate date of commencement of proposed sale to the public:
From time to time after this registration statement becomes effective.

        If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. o

        If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. ý

        If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

        If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. o

        If delivery of the prospectus is expected to be made pursuant to Rule 434, please check the following box. ý


CALCULATION OF REGISTRATION FEE


Title of Each class of
Securities to be Registered

  Amount to
be Registered

  Proposed Maximum
Offering Price
Per Unit (1)

  Proposed Maximum
Aggregate
Offering Price

  Amount of
Registration Fee


Debt Securities   $200,000,000   100%   $200,000,000   $25,340

(1)
Estimated solely for purposes of calculating the registration fee.

        Pursuant to Rule 429 under the Securities Act of 1933, as amended, the prospectus contained in this registration statement will be used as a combined prospectus in connection with this registration statement and registration statement No. 333-104552 which was filed by the registrant on April 15, 2003 and declared effective on April 29, 2003 (the "Prior Registration Statement") under which $15,000,000 in principal amount of the registrant's debt securities and common stock (the "Previously Registered Securities") remain unsold. This registration statement is a new registration statement and also constitutes Post-Effective Amendment No. 1 to the Prior Registration Statement pursuant to which the total amount of unsold Previously Registered Securities registered on the Prior Registration Statement may be offered and sold as debt securities. Such post-effective amendment will become effective concurrently with the effectiveness of this registration statement in accordance with Section 8(a) of the Securities Act. In the event that any of such Previously Registered Securities are offered and sold prior to the effective date of this registration statement, the amount of such Previously Registered Securities so sold will not be included in the prospectus hereunder.

        The registrant hereby amends this registration statement on such date or dates as may be necessary to delay its effective date until the registrant shall file a further amendment which specifically states that this registration statement shall thereafter become effective in accordance with Section 8(a) of the Securities Act of 1933, as amended, or until the registration statement shall become effective on such date as the Commission, acting pursuant to said Section 8(a), may determine.




The information in this prospectus is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

SUBJECT TO COMPLETION, DATED SEPTEMBER 8, 2004

PROSPECTUS

OGE ENERGY CORP.
321 N. Harvey, P.O. Box 321
Oklahoma City, Oklahoma 73101-0321
(405) 553-3000

$215,000,000

DEBT SECURITIES


        We may offer for sale from time to time up to $215,000,000 aggregate principal amount of our unsecured debt securities. We may sell the debt securities in one or more series (1) through underwriters or dealers, (2) directly to a limited number of institutional purchasers, or (3) through agents. See "Plan of Distribution." The amount and terms of the sale of a series of debt securities will be determined at the time of sale and included in a prospectus supplement that will accompany this prospectus. Each prospectus supplement will include if applicable:

        You should read this prospectus and the applicable prospectus supplement carefully before you invest. This prospectus may not be used to sell debt securities unless accompanied by a prospectus supplement.

        Investing in our debt securities involves risks. See "Risk Factors" on page 2 of this prospectus.


        Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or adequacy of this prospectus. Any representation to the contrary is a criminal offense.


The date of this prospectus is                        , 2004.


        You should rely only on the information incorporated by reference or provided in this prospectus. We have not authorized anyone to provide you with different information. We are not making an offer of these debt securities in any state where the offer is not permitted. You should not assume that the information in this prospectus or the documents incorporated by reference is accurate as of any date other than the date on the front of those documents.


TABLE OF CONTENTS

ABOUT THIS PROSPECTUS   1
FORWARD-LOOKING STATEMENTS   1
RISK FACTORS   2
OGE ENERGY CORP   5
USE OF PROCEEDS   5
RATIO OF EARNINGS TO FIXED CHARGES   6
DESCRIPTION OF DEBT SECURITIES   7
LEGAL OPINIONS   14
EXPERTS   14
PLAN OF DISTRIBUTION   14
WHERE YOU CAN FIND MORE INFORMATION   16


ABOUT THIS PROSPECTUS

        This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission ("SEC") utilizing a "shelf" registration process. Under this process, we may, from time to time over the next several years, sell the debt securities described in this prospectus in one or more offerings up to a total dollar amount of $215,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we sell securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement may also add, update or change information contained in this prospectus. You should read both this prospectus and any prospectus supplement together with the additional information described under the heading "Where You Can Find More Information." We believe we have included all information material to investors but some details that may be important for specific investment purposes have not been included. To see more detail, you should read the exhibits filed with this registration statement. In this prospectus, "we," "us," "our," and "our company" refer to OGE Energy Corp., unless the context otherwise requires.


FORWARD-LOOKING STATEMENTS

        This prospectus and the documents it incorporates by reference contain statements that are not historical fact and constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. When we use words like "believes," "expects," "anticipates," "intends," "plans," "estimates," "may," "should" or similar expressions, or when we discuss our strategy or plans, we are making forward-looking statements. Forward-looking statements are not guarantees of performance. They involve risks, uncertainties and assumptions. Our future results may differ materially from those expressed in these forward-looking statements. These statements are necessarily based upon various assumptions involving judgments with respect to the future and other risks, including, among others:


        You are cautioned not to rely unduly on any forward-looking statements. These risks and uncertainties are discussed in more detail under "Business," "Management's Discussion and Analysis of Financial Condition and Results of Operations," and "Notes to Consolidated Financial Statements" in our Annual Report on Form 10-K for the year ended December 31, 2003, under the captions "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Notes


to Condensed Consolidated Financial Statements" in our Quarterly Reports on Form 10-Q for the quarters ended March 31, 2004 and June 30, 2004 and other documents on file with the SEC. You may obtain copies of these documents as described under the heading "Where You Can Find More Information."

        We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. The foregoing review of factors should not be construed as exhaustive.


RISK FACTORS

        An investment in our debt securities may involve significant risks. You should carefully consider these risk factors as well as all of the other information contained or incorporated by reference in this prospectus and the applicable prospectus supplement before you decide to invest in our debt securities.

Risks Related to Our Business

        Any reductions in our credit ratings or the credit ratings of our subsidiaries could increase our financing costs and the costs of maintaining certain contractual relationships and could cause the value of the debt securities to decline.

        We cannot assure you that any of our current ratings or our subsidiaries' current ratings will remain in effect for any given period of time or that a rating will not be lowered or withdrawn entirely by a rating agency if, in its judgment, circumstances in the future so warrant. Any downgrade could lead to higher borrowing costs and, if below investment grade, could require us to issue guarantees on behalf of our subsidiary, Enogex Inc., to support some of Enogex's marketing operations.

        Any lowering of the ratings on the debt securities would likely reduce the value of the debt securities.

        Our profitability depends to a large extent on the ability of our subsidiary, Oklahoma Gas and Electric Company ("OG&E"), to fully recover its costs from its customers and there may be changes in the regulatory environment that impair its ability to recover costs from its customers.

        We are subject to comprehensive regulation by several federal and state utility regulatory agencies, which significantly influences our operating environment and OG&E's ability to fully recover its costs from utility customers. The utility commissions in the states where our utility subsidiary, OG&E, operates regulate many aspects of our utility operations including siting and construction of facilities, customer service and the rates that we can charge customers. The profitability of our utility operations is dependent on our ability to fully recover costs related to providing energy and utility services to our customers.

        As a result of the energy crisis in California and the financial troubles at a number of energy companies, the regulatory environments in which we operate have received an increased amount of public attention. It is possible that there could be changes in the regulatory environment that would impair our ability to fully recover costs historically absorbed by our customers. State utility commissions generally possess broad powers to ensure that the needs of the utility customers are being met.

        We are unable to predict the impact on our operating results from the future regulatory activities of any of the agencies that regulate us. Changes in regulations or the imposition of additional regulations could have an adverse impact on our results of operations.

        Our rates are subject to regulation by the states of Oklahoma and Arkansas, as well as by a federal agency, whose regulatory paradigms and goals may not be consistent.

2



        Our subsidiary, OG&E, is currently a vertically integrated electric utility and most of its revenue results from the sale of electricity to retail customers subject to bundled rates that are approved by the applicable state utility commission and the sale of electricity to wholesale customers subject to rates and other matters approved by the Federal Energy Regulatory Commission (the "FERC").

        Exposure to inconsistent state and federal regulatory standards may limit our ability to operate profitably. Further alteration of the regulatory landscape in which we operate may harm our financial condition and results of operations.

        OG&E's Settlement Agreement with the Oklahoma Corporation Commission ("OCC") relating to its 2002 rate case targets $75 million of savings over a three-year period from the acquisition of new generation. OG&E may not be able to achieve such targeted savings, in which case OG&E may be required to credit any unrealized savings to its customers.

        As part of OG&E's settlement agreement in November 2002, OG&E indicated that the acquisition of up to 400 megawatts of new generation should provide $75 million of savings to its customers over three years. OG&E also agreed that if it is unable to demonstrate such savings, it will credit its customers any realized savings below $75 million. We cannot assure you that OG&E will be able to realize the targeted $75 million of savings to its customers, in which case OG&E may be required to credit unrealized savings to its customers.

        We are subject to commodity price risk, credit risk and other risks associated with energy markets.

        We are exposed to market and credit risks in our generation, retail distribution and energy trading operations. To minimize the risk of market price and volume fluctuations, we may enter into physical or financial derivative instrument contracts to hedge purchase and sale commitments, fuel requirements and inventories of natural gas, distillate fuel oil, electricity and coal, and emission allowances. However, financial derivative instrument contracts do not eliminate the risk. Specifically, such risks include commodity price changes, market supply shortages, credit risk and interest rate changes. The impact of these variables could result in our inability to fulfill contractual obligations, significantly higher energy or fuel costs relative to corresponding sales contracts or increased interest expense.

        Credit risk includes the risk that counterparties that owe us money or energy will breach their obligations. If the counterparties to these arrangements fail to perform, we may be forced to enter into alternative arrangements. In that event, our financial results could be adversely affected and we could incur losses.

        We mark our energy trading portfolio to estimated fair market value on a daily basis (mark-to-market accounting), which causes earnings variability. Market prices are utilized in determining the value of electric energy, natural gas and related derivative commodity instruments. For longer-term positions, which are limited to a maximum of 18 months, and certain short-term positions for which market prices are not available, models based on forward price curves are utilized. These models incorporate estimates and assumptions as to a variety of factors such as pricing relationships between various energy commodities and geographic locations. Actual experience can vary significantly from these estimates and assumptions.

        Increased competition resulting from restructuring efforts could have a significant financial impact on us and OG&E and consequently decrease our revenue and earnings.

        We have been and will continue to be affected by competitive changes to the utility and energy industries. Significant changes already have occurred and additional changes have been proposed to the wholesale electric market. Although retail restructuring efforts in Oklahoma and Arkansas have stalled for the time being, if such efforts were renewed, retail competition and the unbundling of regulated energy service could have a significant financial impact on us due to an impairment of assets, a loss of retail customers, lower profit margins or increased costs of capital. Any such restructuring could have a

3



significant impact on our consolidated financial position, results of operations and cash flows. We cannot predict when we will be subject to changes in legislation or regulation, nor can we predict the impact of these changes on our consolidated financial position, results of operations or cash flows. We believe that the prices OG&E charges for electricity and the quality and reliability of its service currently place it in a position to compete effectively in the energy market.

        Recent events that are beyond our control have increased the level of public and regulatory scrutiny of our industry. Governmental and market reactions to these events may have negative impacts on our business, financial condition and access to capital.

        As a result of the energy crisis in California during the summer of 2001, the volatility of natural gas prices in North America, the bankruptcy filing by Enron Corporation, accounting irregularities at public companies in general and energy companies in particular, and investigations by governmental authorities into energy trading activities, companies in the regulated and unregulated utility business have been under an increased amount of public and regulatory scrutiny and suspicion. The accounting irregularities have caused regulators and legislators to review current accounting practices, financial disclosures and relationships between corporations and their independent auditors. The capital markets and ratings agencies also have increased their level of scrutiny. We believe that we are complying with all applicable laws and accounting standards, but it is difficult or impossible to predict or control what effect these types of events may have on our business, financial condition or access to the capital markets.

        As a result of these events, Congress passed the Sarbanes-Oxley Act of 2002. It is unclear what additional laws or regulations may develop, and we cannot predict the ultimate impact of any future changes in accounting regulations or practices in general with respect to public companies, the energy industry or our operations specifically. Any new accounting standards could affect the way we are required to record revenues, expenses, assets and liabilities. These changes in accounting standards could lead to negative impacts on reported earnings or increases in liabilities that could, in turn, affect our reported results of operations.

Risks Related to Our Corporate Structure

        We are a holding company and thus our investments in our subsidiaries are our primary assets. Substantially all of our operations are conducted by our subsidiaries. Consequently, our operating cash flow and our ability to service our indebtedness depends upon the operating cash flow of our subsidiaries and the payment of funds by them to us in the form of dividends. Our subsidiaries are separate legal entities that have no obligation to pay any amounts due on our indebtedness or to make any funds available for that purpose, whether by dividends or otherwise. In addition, each subsidiary's ability to pay dividends to us depends on any statutory and contractual restrictions that may be applicable to such subsidiary, which may include requirements to maintain minimum levels of working capital and other assets.

        In addition, as discussed above, OG&E is regulated by state utility commissions in Oklahoma and Arkansas which generally possess broad powers to ensure that the needs of the utility customers are being met. To the extent that the state commissions attempt to impose restrictions on the ability of OG&E to pay dividends to us, it could adversely affect our ability to make payments on our indebtedness or otherwise meet our financial obligations.

        The debt securities are effectively subordinated to all existing and future indebtedness and liabilities of our subsidiaries and would have a claim that is junior with respect to the assets securing any secured debt issued by us.

4



        As a stockholder, rather than a creditor of our subsidiaries, our right and the rights of our creditors to participate in the assets of any of our subsidiaries upon any liquidation or reorganization of that subsidiary will rank behind the claims of that subsidiary's creditors, including trade creditors (except to the extent we have a claim as a creditor of such subsidiary). As a result, the debt securities will be effectively subordinated to all existing and future indebtedness and other liabilities, including trade payables, of our subsidiaries.

        As of June 30, 2004, our subsidiaries had outstanding indebtedness and other liabilities of approximately $3.3 billion. We and our subsidiaries may incur additional debt. The indenture governing the debt securities does not contain any restriction on us or our subsidiaries incurring additional debt, including secured debt, which would have a prior claim on the assets securing the debt.

        There is no existing market for the debt securities and we cannot assure you that an active trading market will develop.

        There is no existing market for the debt securities and we cannot assure you that an active trading market will develop. If a market for the debt securities were to develop, future trading prices would depend on many factors, including prevailing interest rates, our operating results and the market for similar securities. We do not intend to apply for listing or quotation of the debt securities on any securities exchange or stock market. As a result, it may be difficult for you to find a buyer for your debt securities at the time you want to sell them, and even if you find a buyer, you might not get the price you want.


OGE ENERGY CORP.

        We are an energy and energy services provider offering physical delivery and management of both electricity and natural gas in the south central United States. We conduct these activities through our electric utility and natural gas pipeline segments.

        Our electric utility segment generates, transmits, distributes and sells electric energy in Oklahoma and western Arkansas. These operations are conducted through our OG&E subsidiary, and are subject to regulation by the OCC, the Arkansas Public Service Commission and the FERC.

        Our natural gas pipeline segment transports and stores natural gas, gathers and processes natural gas, and markets natural gas. These operations are conducted through our subsidiary, Enogex Inc., and its subsidiaries.

        We were incorporated in Oklahoma on August 4, 1995 and became the holding company parent of OG&E and Enogex on December 31, 1996.

        Our principal executive offices are located at 321 North Harvey, Post Office Box 321, Oklahoma City, Oklahoma 73101-0321. Our telephone number is (405) 553-3000.


USE OF PROCEEDS

        We will add the net proceeds from the sale of the debt securities to our general funds and use those proceeds for general corporate purposes, primarily to repay long or short-term debt and to fund capital expenditures of our operating units and subsidiaries. The specific use of the proceeds of a particular series of the debt securities will be described in the applicable prospectus supplement.

5




RATIO OF EARNINGS TO FIXED CHARGES
(unaudited)

 
   
  Year Ended December 31,
 
  Six Months Ended
June 30, 2004

 
  2003
  2002
  2001
  2000
  1999
Ratio of Earnings to Fixed Charges   2.40   3.06   2.08   2.10   2.45   3.12

        For purposes of computing the ratio of earnings to fixed charges, (1) earnings consist of pre-tax income from continuing operations plus fixed charges less allowance for borrowed funds used during construction and minority interest expense; and (2) fixed charges consist of interest on long-term debt, related amortization, interest on short-term borrowings and a calculated portion of rents considered to be interest.

        Assuming that our variable interest rate debt continues at interest rates in effect on June 30, 2004, the annual interest requirement on our long-term debt outstanding at June 30, 2004, was $87.5 million.

6



DESCRIPTION OF DEBT SECURITIES

        The description below contains summaries of selected provisions of the indenture, including the supplemental indenture, under which the debt securities will be issued. These summaries are not complete. The form of indenture and the form of supplemental indenture have been filed as exhibits to the registration statement. You should read the indenture and the supplemental indenture for provisions that may be important to you. In the summaries below, we have included references to section numbers of the indenture so that you can easily locate these provisions.

        We are not required to issue future issues of indebtedness under the indenture described in this prospectus. We are free to use other indentures or documentation, containing provisions different from those described in this prospectus, in connection with future issues of other indebtedness.

        The debt securities will be represented either by global securities registered in the name of The Depository Trust Company ("DTC"), as depository ("Depository"), or its nominee, or by securities in certificate form issued to the registered owners, as described in the applicable prospectus supplement. See "—Book-Entry System" below.

General

        We may issue the debt securities as notes or debentures or other unsecured evidences of indebtedness in one or more new series under an indenture between us and UMB Bank, N.A., or any other trustee to be named as trustee (the "Trustee"). This indenture, to be supplemented by a new supplemental indenture for each series of debt securities, is referred to in this prospectus as the "Indenture." The debt securities will be unsecured obligations and will rank on a parity with our other existing and future unsecured and unsubordinated indebtedness. The debt securities will be obligations exclusively of our company. As a holding company, we have no material assets other than our ownership of the common stock of our subsidiaries. Unless we say otherwise in a prospectus supplement, we will rely entirely upon distributions and other amounts received from our subsidiaries to meet the payment obligations under the debt securities.

        Our subsidiaries are separate and distinct legal entities and have no obligation, contingent or otherwise, to pay amounts due under the debt securities or otherwise to make any funds available to us. This includes the payment of dividends or other distributions or the extension of loans or advances, unless we say otherwise in a prospectus supplement. Public utility commissions that regulate OG&E may effectively restrict the payment of dividends to us by OG&E.

        Furthermore, the ability of our subsidiaries to make any payments to us would be dependent upon the terms of any credit facilities of the subsidiaries and upon the subsidiaries' earnings, which are subject to various business risks. In a bankruptcy or insolvency proceeding, claims of holders of the debt securities would be satisfied solely from our equity interests in our subsidiaries remaining after the satisfaction of claims of creditors of the subsidiaries. Accordingly, the debt securities will be effectively subordinated to existing and future liabilities of our subsidiaries to their respective creditors.

        The amount of debt securities that we may issue under the Indenture is not limited.

        The debt securities may be issued in one or more series, may be issued at various times, may have differing maturity dates and may bear interest at differing rates. The prospectus supplement applicable to each issue of debt securities will specify:

7


        Any special United States federal income tax considerations applicable to debt securities sold at an original issue discount and any special United States federal income tax or other considerations applicable to any debt securities which are denominated in other than United States dollars will be described in the prospectus supplement relating to that series of debt securities.

        Unless otherwise indicated in the applicable prospectus supplement, the debt securities will be denominated in United States currency in minimum denominations of $1,000 and integral multiples of $1,000.

        Unless otherwise indicated in the applicable prospectus supplement, there will be no provisions in the Indenture or the debt securities that require us to redeem, or permit the holders to cause a redemption or repurchase of, the debt securities or that otherwise protect the holders in the event that we incur substantial additional indebtedness, whether or not in connection with a change in control of our company.

Registration, Transfer And Exchange

        Debt securities of any series may be exchanged for other debt securities of the same series of any authorized denominations and of a like aggregate principal amount, stated maturity and original issue date (Section 2.06).

        Unless we indicate otherwise in the applicable prospectus supplement, debt securities may be presented for registration of transfer (duly endorsed or accompanied by a duly executed written instrument of transfer), at the office of the Trustee maintained for that purpose and referred to in the applicable prospectus supplement, without service charge and upon payment of any taxes and other governmental charges as described in the Indenture. Any transfer or exchange will be made only upon the Trustee's satisfaction with the documents of title and indemnity of the person making the request (Sections 2.06 and 2.07).

        The Trustee will not be required to exchange or register a transfer of any debt securities of a series that is selected, called or being called for redemption except, in the case of any debt security to be redeemed in part, the portion thereof not to be so redeemed (Section 2.06). See "—Book-Entry System" below.

Payment and Paying Agents

        Payment of the principal, interest and premium, if any, on debt securities issued in the form of global securities will be paid in the manner described below under the heading "—Book-Entry System." Unless we indicate otherwise in the applicable prospectus supplement, interest on debt securities that are in the form of certificated securities will be paid by check mailed to the holder at that holder's address as it appears in the register for the debt securities maintained by the Trustee; however, a holder of $10,000,000 or more of debt securities having the same interest payment dates will be entitled to receive payments of interest by wire transfer to a bank within the continental United States if appropriate wire transfer instructions have been received by the Trustee on or prior to the applicable

8



record date (Section 2.12). Unless we indicate otherwise in the applicable prospectus supplement, the principal, interest at maturity and premium, if any, on debt securities in the form of certificated securities will be payable in immediately available funds at the office of the Trustee upon presentation of the debt securities (Section 2.12).

        All monies paid by us to a paying agent for the payment of principal, interest or premium on any debt security which remain unclaimed at the end of two years after that principal, interest or premium has become due and payable will be repaid to us and the holder of that debt security may thereafter look only to us for payment of that principal, interest or premium (Section 4.04).

Events of Default

        The following are events of default under the Indenture (Section 7.01):

        If an event of default occurs and is continuing, either the Trustee or the holders of a majority in principal amount of the outstanding debt securities of all series issued under the Indenture may declare the principal amount of all such debt securities to be due and payable immediately. At any time after an acceleration of the debt securities has been declared, but before a judgment or decree of the immediate payment of the principal amount of the debt securities has been obtained, if we pay or deposit with the Trustee a sum sufficient to pay all matured installments of interest and the principal and any redemption premium which has become due otherwise than by acceleration and all defaults have been cured or waived, then that payment or deposit will cause an automatic rescission and annulment of the acceleration of the debt securities (Section 7.01).

        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 the holders have offered reasonable security to the Trustee (Section 8.02). The holders of a majority in principal amount of the outstanding debt securities of all series issued under the Indenture generally 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, relating to the debt securities. The holders of a majority in principal amount of the outstanding debt securities of all series issued under the Indenture generally will be able to waive any past default or event of default except a default in the payment of principal, premium or interest on the debt securities (Section 7.07). Each holder has the right to institute a proceeding relating to the Indenture, but this right is subject to conditions precedent specified in the Indenture (Section 7.04). The Trustee is required to give the holders notice of the occurrence of a default within 90 days of the default, unless the default is cured or waived. Except in the case of a payment default on the debt securities, however, the Trustee may withhold notice if it determines in good faith that it is in the interest of holders to do so (Section 7.08). We are required to deliver to the Trustee each year a certificate as to whether or not we are in compliance with the conditions and covenants under the Indenture (Section 5.05).

9



Modification

        Unless otherwise indicated in the applicable prospectus supplement, we and the Trustee may modify and amend the Indenture and the debt securities from time to time. Depending upon the type of amendment, we may not need the consent or approval of any of the holders of the debt securities, or we may need either the consent or approval of the holders of a majority in principal amount of the outstanding debt securities of all series issued under the Indenture or the consent or approval of each holder affected by the proposed amendment.

        We will not need the consent of the holders for the following types of amendments (Section 12.01):

        We will need the consent of the holders of each outstanding debt security affected by a proposed amendment if the amendment would cause any of the following to occur (Section 12.02):

        Amendments other than those described in the above two paragraphs will require the approval of a majority in principal amount of the outstanding debt securities.

Defeasance and Discharge

        We may be discharged from all obligations relating to the debt securities and the Indenture (except for specified obligations such as obligations to register the transfer or exchange of debt securities, replace stolen, lost or mutilated debt securities and maintain paying agencies) if we irrevocably deposit with the Trustee, in trust for the benefit of holders of debt securities, money or United States government obligations, or any combination thereof, sufficient to make all payments of principal, premium and interest on the debt securities on the dates those payments are due. To discharge those obligations, we must deliver to the Trustee an opinion of counsel that the holders of the debt securities will not recognize income, gain or loss for federal income tax purposes as a result of the defeasance or discharge of the Indenture. If we discharge our obligations as described above, the holders of debt securities must look only to the funds deposited with the Trustee, and not us, for payments on the debt securities (Section 4.01).

10



Consolidation, Merger and Sale of Assets; No Financial Covenants

        We will not merge into any other corporation or sell or otherwise transfer all or substantially all our assets unless the successor or transferee corporation assumes by supplemental indenture our obligations to pay the principal, applicable redemption premium and interest on all the debt securities and our obligation to perform the covenants in the Indenture that we are supposed to perform or observe. Upon any merger, sale or transfer of all or substantially all of our assets, the successor or transferee corporation will succeed to, and be substituted for, and may exercise all of our rights and powers under the Indenture with the same effect as if the successor corporation had been named as us in the Indenture, and we will be released from all obligations under the Indenture. The Indenture defines all or substantially all of our assets as being 662/3 percent or more of our total assets as shown on our balance sheet as of the end of the prior year and specifically permits any sale, transfer or conveyance during a calendar year of less than 662/3 percent of our total assets without the consent of the holders of the debt securities (Sections 11.01 and 11.02).

        Unless we indicate otherwise in the applicable prospectus supplement, the Indenture will not contain any financial or other similar restrictive covenants.

Resignation or Removal of Trustee

        The Trustee may resign at any time by notifying us in writing and specifying the day that the resignation is to take effect. The resignation will not take effect, however, until a successor trustee has been appointed (Section 8.10).

        The holders of a majority in principal amount of the outstanding debt securities may remove the Trustee at any time. 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 (1) notice to the Trustee and the holder of each debt security outstanding under the Indenture and (2) appointment of a successor Trustee (Section 8.10).

Concerning the Trustee

        UMB Bank, N.A. is the Trustee. We and our affiliates maintain banking relationships with the Trustee in the ordinary course of business. The Trustee also acts as trustee for securities of our affiliates.

Book-Entry System

        Each series of debt securities offered by this prospectus may be issued in the form of one or more global securities representing all or part of that series of debt securities. This means that we will not issue certificates for that series of debt securities to the holders. Instead, a global security representing that series will be deposited with, or on behalf of, DTC, or its successor as the Depository and registered in the name of the Depository or a nominee of the Depository.

        The Depository will keep a computerized record of its participants (for example, your broker) whose clients have purchased debt securities represented by a global security. Unless it is exchanged in whole or in part for a certificated security, a global security may not be transferred, except that the Depository, its nominees and their successors may transfer a global security as a whole to one another.

        Beneficial interests in global securities will be shown on, and transfers of interests will be made only through, records maintained by the Depository and its participants. The laws of some jurisdictions require that some purchasers take physical delivery of securities in definitive form. These laws may impair the ability to transfer beneficial interests in a global security.

11



        We will wire principal, interest and any premium payments to the Depository or its nominee. We and the Trustee will treat the Depository or its nominee as the owner of the global security for all purposes, including any notices and voting. Accordingly, we, the Trustee and any paying agent will have no direct responsibility or liability to pay amounts due on a global security to owners of beneficial interests in a global security.

        Unless otherwise specified in the prospectus supplement, DTC will act as Depository for debt securities issued as global securities. The debt securities will be 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.

        DTC, the world's largest depository, 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 securities that its participants ("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 other organizations. DTC is a wholly-owned subsidiary of The Depository Trust & Clearing Corporation ("DTCC"). DTCC, in turn, is owned by a number of the Direct Participants of DTC and members of the National Securities Clearing Corporation, the Government Securities Clearing Corporation, MBS Clearing Corporation and Emerging Markets Clearing Corporation (NSCC, GSCC, MBSCC and EMCC are also subsidiaries of DTCC) and by the New York Stock Exchange, Inc., the American Stock Exchange, LLC, and the National Association of Securities Dealers, Inc. Access to the DTC system is also available to others such as both U.S. and non-U.S. securities brokers and dealers, banks, and trust companies that clear through or maintain a custodial relationship with a Direct Participant, either directly or indirectly ("Indirect Participants"). The rules that apply to DTC and its Direct or Indirect Participants (collectively, "Participants") are on file with the SEC.

        Purchases of debt securities under the DTC system must be made by or through Direct Participants, which will receive a credit for the debt securities on DTC's records. The ownership interest of each actual purchaser of each debt security ("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 are, however, 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 debt 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 debt securities, except in the event that use of the book-entry system for the debt securities is discontinued.

        To facilitate subsequent transfers, all debt 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 debt securities with DTC and their registration in the name of Cede & Co. or such other nominee do not effect any change in beneficial ownership. DTC has no knowledge of the actual Beneficial Owners of the debt securities; DTC's records reflect only the identity of the Direct Participants to whose accounts such debt 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.

12



        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.

        Redemption notices shall be sent to DTC. If less than all of the debt securities within an issue 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 such other DTC nominee) will consent or vote with respect to the debt 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 debt securities are credited on the record date (identified in a listing attached to the Omnibus Proxy).

        Payments of principal, interest and redemption proceeds on the debt 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 on 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 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 nor its nominee, the Trustee or us, subject to any statutory or regulatory requirements as may be in effect from time to time. Payments of principal, interest and redemption proceeds to Cede & Co. (or such other nominee as may be requested by an authorized representative of DTC) are the responsibility of us and the Trustee, 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 Direct and Indirect Participants.

        DTC may discontinue providing its services as securities depository with respect to the debt securities at any time by giving reasonable notice to Issuer or Agent. Under such circumstances, in the event that a successor securities depository is not obtained, security certificates are required to be printed and delivered.

        We may decide to discontinue use of the system of book-entry transfers through DTC (or a successor securities depository). In that event, security certificates will be printed and delivered to DTC.

        Debt securities of a series represented by a global security will be exchangeable for certificated securities with the same terms in authorized denominations only if:

        The information in this section concerning DTC and DTC's book-entry system has been obtained from DTC, and we and any underwriters, dealers or agents take no responsibility for the accuracy thereof.

        Any underwriters, dealers or agents of debt securities may be Direct Participants of DTC.

13



LEGAL OPINIONS

        Legal opinions relating to the debt securities will be rendered by our counsel, Rainey, Ross, Rice & Binns, Oklahoma City, Oklahoma, and Jones Day, Chicago, Illinois. Rainey, Ross, Rice & Binns will pass on matters pertaining to local laws and as to these matters other counsel will rely on their opinions. As of July 31, 2004, Mr. Hugh D. Rice, a partner in Rainey, Ross, Rice & Binns, owned a beneficial interest in 3,000 shares of common stock of our company. Certain legal matters will be passed upon for any underwriters, dealers or agents named in a prospectus supplement by Chapman and Cutler LLP, Chicago, Illinois.


EXPERTS

        Ernst & Young LLP, an independent registered public accounting firm, have audited our consolidated financial statements and schedule included in our Annual Report on Form 10-K for the year ended December 31, 2003, as set forth in their report, which is incorporated by reference in this prospectus and elsewhere in the registration statement. Our consolidated financial statements and schedule are incorporated by reference in reliance on Ernst & Young LLP's report, given on their authority as experts in accounting and auditing.


PLAN OF DISTRIBUTION

        We may sell the debt securities directly or indirectly through underwriters, dealers or agents. The names of any underwriters, dealers or agents will be set forth in the applicable prospectus supplement. We will also set forth in the applicable prospectus supplement:

        We may distribute the debt securities from time to time in one or more transactions at:


        We will describe the method of distribution in the applicable prospectus supplement.

        If we use underwriters with respect to an issuance of securities, we will set forth in the applicable prospectus supplement:

14


        The underwriters will acquire any securities for their own accounts and they may resell the securities from time to time in one or more transactions, including negotiated transactions, at a fixed public offering price and at varying prices determined at the time of sale.

        Any initial public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be changed from time to time. We anticipate that any underwriting agreement pertaining to any securities will:

        In connection with an offering of debt securities, underwriters may engage in transactions that stabilize, maintain or otherwise affect the price of the debt securities. Specifically, underwriters may:

        Any of these activities may stabilize or maintain the market price of the debt securities above independent market levels. Underwriters are not required to engage in these activities, and may end any of these activities at any time.

        If we use a dealer in an offering of debt securities, we will sell the debt securities to the dealer, as principal. The dealer may then resell the debt securities to the public at varying prices to be determined by the dealer at the time of resale. We will set forth the name of the dealer and the terms of the transaction in the prospectus supplement.

        If we use an agent in an offering of debt securities, we will name the agent and describe the terms of the agency in the applicable prospectus supplement. Unless we indicate otherwise in the prospectus supplement, we will require an agent to act on a best efforts basis for the period of its appointment.

        Dealers and agents named in a prospectus supplement may be considered underwriters of the securities described in the prospectus supplement under the Securities Act of 1933. We may indemnify them against certain civil liabilities under the Securities Act of 1933. In the ordinary course of business, we may engage in transactions with underwriters, dealers and agents and they may perform services for us.

        We may solicit offers to purchase securities and make sales directly to institutional investors or others who may be considered underwriters under the Securities Act of 1933 with respect to those sales. We will describe the terms of any such offer in the applicable prospectus supplement.

15



WHERE YOU CAN FIND MORE INFORMATION

        We file annual, quarterly and special reports, proxy statements and other information with the SEC. Our SEC filings are available to the public over the Internet at the SEC's web site at http: //www.sec.gov. You may also read and copy any document we file at the SEC's Public Reference Room at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the Public Reference Room.

        The SEC allows us to "incorporate by reference" in this prospectus the information we file with it, which means that we can disclose important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus, and information that we file later with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below and any future filings made with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934 after the date of the filing of the initial registration statement until we sell all of the debt securities described in this prospectus.

        We are not required to, and do not expect to, provide annual reports to holders of our debt securities unless specifically requested by a holder.

        You may request a copy of these filings at no cost, by writing or telephoning us at the following address:

16



PART II:

INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.    OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

        Set forth below is an estimate of the approximate amount of our fees and expenses (other than underwriting discounts and commissions) in connection with the issuance of the debt securities:

Registration fee under the Securities Act of 1933   $ 25,340 *

Fees of rating agencies

 

$

113,250

 

Printing and engraving

 

$

50,000

 

Accounting services

 

$

50,000

 

Legal fees of company counsel

 

$

60,000

 

Trustee's charges

 

$

15,000

 

Expenses and counsel fees for qualification or registration of the debt securities under state securities laws

 

$

7,500

 

Miscellaneous, including traveling, telephone, copying, shipping, and other out-of-pocket expenses

 

$

8,910

 
   
 
 
Total

 

$

330,000

 
   
 

*
All items are estimated except the first.

ITEM 15.    INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Section 1031 of Title 18 of the Annotated Oklahoma Statutes provides that we may, and in some circumstances must, indemnify our directors and officers against liabilities and expenses incurred by them as a result of serving in that capacity, subject to some limitations and conditions set forth in the statute. Substantially similar provisions that require indemnification are contained in our Restated Certificate of Incorporation, which is filed as Exhibit 3.01 to our Form 10-K for the year ended December 31, 1996, and is incorporated herein by this reference. Our Restated Certificate of Incorporation also contains provisions limiting the liability of our officers and directors in some instances. We have an insurance policy covering our directors and officers against specified personal liability, which may include liabilities under the Securities Act of 1933, as amended. The Form of Purchase Agreement filed as Exhibit 1.01 includes provisions requiring the underwriters to indemnify our directors and officers in some circumstances.

ITEM 16.    EXHIBITS.

1.01   Form of Purchase Agreement for Debt Securities

4.01

 

Form of Indenture between OGE Energy Corp. and UMB Bank, N.A., as trustee.

4.02

 

Form of Supplemental Indenture for each series of debt securities, being a supplemental instrument to Exhibit 4.01 hereto.

5.01

 

Opinion of counsel as to legality of the debt securities.

12.01

 

Statement of computation of ratio of earnings to fixed charges.

23.01

 

Consent of independent registered public accounting firm.
     

II-1



23.02

 

Legal counsel's consent.

24.01

 

Powers of attorney.

25.01

 

Form T-1 Statement of Eligibility of UMB Bank, N.A. to act as Trustee under the Indenture.

 

 

 

ITEM 17.    UNDERTAKINGS.

        The undersigned registrant hereby undertakes:

        (1)   To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: (i) to include any prospectus required by Section 10(a)(3) of the Securities Act of 1933; (ii) to reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the Form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement; and (iii) to include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement; provided, however, that clauses (i) and (ii) above do not apply if the registration statement is on Form S-3, Form S-8 or Form F-3 and the information required to be included in a post-effective amendment by those clauses is contained in periodic reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement.

        (2)   That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

        (3)   To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

        The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934 (and where applicable, each filing of an employee benefit plan's annual report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

        Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act of 1933 and will be governed by the final adjudication of such issue.

II-2



SIGNATURE

        Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all the requirements for filing on Form S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Oklahoma City and State of Oklahoma on the 7th day of September, 2004.

    OGE ENERGY CORP.

 

 

By:

/s/  
STEVEN E. MOORE      
Steven E. Moore
President, Chief Executive Officer and
Chairman of the Board
(Principal Executive Officer)

        Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

Signature
  Title
  Date

 

 

 

 

 
*
Steven E. Moore
  President, Chief Executive Officer,
Chairman of the Board and Director
(Principal Executive Officer)
  September 7, 2004

*

James R. Hatfield

 

Chief Financial Officer
(Principal Financial Officer)

 

September 7, 2004

*

Donald R. Rowlett

 

Vice President and Controller
(Principal Accounting Officer)

 

September 7, 2004

*

Herbert H. Champlin

 

  
Director

 

September 7, 2004

*

Luke R. Corbett

 

  
Director

 

September 7, 2004

*

William E. Durrett

 

 
Director

 

September 7, 2004
         

II-3



*

Martha W. Griffin

 

  
Director

 

September 7, 2004

*

John D. Groendyke

 

 
Director

 

September 7, 2004

*

Robert Kelley

 

 
Director

 

September 7, 2004

*

Ronald H. White, M.D.

 

  
Director

 

September 7, 2004

*

J. D. Williams

 

 
Director

 

September 7, 2004

*By:

 

/s/  
JAMES R. HATFIELD    

James R. Hatfield
(Attorney-in-Fact)
September 7, 2004

 

 

 

 

II-4



EXHIBIT INDEX

1.01   Form of Purchase Agreement for Debt Securities.

4.01

 

Form of Indenture between OGE Energy Corp. and UMB Bank, N.A., as trustee.

4.02

 

Form of Supplemental Indenture for each series of debt securities, being a supplemental instrument to Exhibit 4.01 hereto.

5.01

 

Opinion of counsel as to legality of the debt securities.

12.01

 

Statement of computation of ratio of earnings to fixed charges.

23.01

 

Consent of independent registered public accounting firm.

23.02

 

Legal counsel's consent.

24.01

 

Powers of attorney.

25.01

 

Form T-1 Statement of Eligibility of UMB Bank, N.A. to act as Trustee under the Indenture.

II-5




QuickLinks

TABLE OF CONTENTS
ABOUT THIS PROSPECTUS
FORWARD-LOOKING STATEMENTS
RISK FACTORS
OGE ENERGY CORP.
USE OF PROCEEDS
RATIO OF EARNINGS TO FIXED CHARGES (unaudited)
DESCRIPTION OF DEBT SECURITIES
LEGAL OPINIONS
EXPERTS
PLAN OF DISTRIBUTION
WHERE YOU CAN FIND MORE INFORMATION
PART II: INFORMATION NOT REQUIRED IN PROSPECTUS
SIGNATURE
EXHIBIT INDEX