OGE ENERGY CORP
424B5, 1999-10-13
ELECTRIC SERVICES
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<PAGE>
                 SUBJECT TO COMPLETION, DATED OCTOBER 13, 1999
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. OGE
ENERGY CAPITAL TRUST I AND OGE ENERGY CORP. MAY NOT SELL THESE SECURITIES OR
ACCEPT AN OFFER TO BUY THESE SECURITIES UNTIL THIS PROSPECTUS IS DELIVERED IN
FINAL FORM. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND OGE
ENERGY CAPITAL TRUST I AND OGE ENERGY CORP. ARE NOT SOLICITING OFFERS TO BUY
THESE SECURITIES IN ANY STATE OR JURISDICTION WHERE SUCH OFFER OR SALE IS NOT
PERMITTED.
<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED OCTOBER 13, 1999)

                                 PREFERRED SECURITIES

                           OGE ENERGY CAPITAL TRUST I

                              % PREFERRED SECURITIES
                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)
     FULLY AND UNCONDITIONALLY GUARANTEED, TO THE EXTENT SET FORTH HEREIN,
                                       BY

                                OGE ENERGY CORP.

<TABLE>
<C>             <S>
 Maturity Date  , 2039.

        Issuer  The trust that is issuing the preferred securities will have no assets other than
                junior subordinated debt securities issued by OGE Energy. The junior subordinated
                debt securities will have essentially the same terms as the preferred securities.
                Therefore, the trust can only make payments on the preferred securities if OGE Energy
                first makes payments on the junior subordinated debt securities.

 Distributions  Quarterly, beginning       , 1999. May be postponed for one or more periods, each not
       Payable  exceeding five years, but not past the maturity date.

    Redemption  At OGE Energy's option at a price of $25 per share plus accrued and unpaid
                distributions, on or after         , 20  and at any time within 90 days after
                specified changes in investment company or tax law.

 Subordination  The preferred securities are effectively subordinated to all senior indebtedness of
                OGE Energy and all existing and future liabilities of its subsidiaries.

       Listing  Application will be made to trade the preferred securities on the New York Stock
                Exchange under the ticker symbol       .
</TABLE>

      INVESTING IN THE PREFERRED SECURITIES INVOLVES RISKS. RISK FACTORS BEGIN
ON PAGE S-5 OF THIS PROSPECTUS SUPPLEMENT.

      NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED THAT
THIS PROSPECTUS SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR
COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>
                                                                              PER PREFERRED SECURITY        TOTAL
                                                                             -------------------------  -------------
<S>                                                                          <C>                        <C>
Public offering price......................................................          $      25          $
Underwriting commissions to be paid by OGE Energy..........................                   (1)                    (1)
Proceeds to the trust......................................................          $      25          $
</TABLE>

- --------------------------
(1) Underwriting commissions of $0.  per preferred security will be paid by OGE
    Energy; except that for sales of preferred securities to certain
    institutions the underwriting commission will be $0.  per preferred
    security.

    The preferred securities are expected to be ready for delivery in book-entry
form only through the facilities of The Depository Trust Company on or about
        , 1999.

LEHMAN BROTHERS

         A.G. EDWARDS & SONS, INC.

                  CIBC WORLD MARKETS

                           MERRILL LYNCH & CO.

                                    MORGAN STANLEY DEAN WITTER

                                             PRUDENTIAL SECURITIES

      , 1999
<PAGE>
                                OGE ENERGY CORP.

    OGE Energy is a public utility holding company, which was incorporated in
August 1995 in the State of Oklahoma. The Company serves as the parent company
to Oklahoma Gas and Electric Company, which operates under the trade name OG&E
Electric Services, and Enogex Inc. and any other companies that may be formed
within the organization in the future.

    The Company's principal subsidiary is OG&E and, accordingly, the Company's
financial results and condition are substantially dependent at this time on the
financial results and condition of OG&E. OG&E is a regulated public utility
engaged in the generation, transmission and distribution of electricity to
retail and wholesale customers. OG&E was incorporated in 1902 under the laws of
the Oklahoma Territory and is the largest electric utility in the State of
Oklahoma. OG&E sold its retail gas business in 1928 and now owns and operates an
interconnected electric production, transmission and distribution system which
includes eight active generating stations with a total capability of 5,561,180
kilowatts.

    Enogex, with the completion of the Transok acquisition described below, owns
and operates approximately 9,700 miles of natural gas transmission and gathering
pipelines, has interests in fifteen gas processing plants, markets electricity,
natural gas and natural gas products and invests in the drilling for and
production of crude oil and natural gas.

    Enogex completed its acquisition of Tejas Transok Holding, L.L.C., a
gatherer, processor, and transporter of natural gas in Oklahoma and Texas on
July 1, 1999. Transok's principal assets included approximately 4,900 miles of
natural gas pipelines in Oklahoma and Texas with a capacity of approximately 1.2
billion cubic feet per day and 18 billion cubic feet of underground gas storage.
Transok also owned 9 gas processing plants, which produced approximately 25,000
barrels per day of natural gas liquids in 1998. Enogex purchased Transok from
Tejas Energy L.L.C. of Houston, an affiliate of Shell Oil Company, for
approximately $710.3 million, which included assumption of $173 million of
long-term debt.

    OGE Energy's principal executive office is at 321 North Harvey Avenue, P.O.
Box 321, Oklahoma City, Oklahoma 73101-0321, and its telephone number is (405)
553-3000.

                                      S-2
<PAGE>
                            SELECTED FINANCIAL DATA

<TABLE>
<CAPTION>
                                                                                                              6 MONTHS ENDED
                                                  YEAR ENDED DECEMBER 31,                                     JUNE 30, 1999
                                   -----------------------------------------------------    1998 PRO     ------------------------
                                     1994       1995       1996       1997       1998       FORMA(1)      ACTUAL    PRO FORMA(1)
                                   ---------  ---------  ---------  ---------  ---------  -------------  ---------  -------------
                                                                 ($ MILLIONS EXCEPT PER SHARE DATA)
<S>                                <C>        <C>        <C>        <C>        <C>        <C>            <C>        <C>
Operating revenues...............  $ 1,355.2  $ 1,302.0  $ 1,387.4  $ 1,443.6  $ 1,617.7    $ 2,088.5    $   829.1    $ 1,080.3

Pre-tax operating income(2)......      272.5      271.0      279.4      268.5      339.5        329.1        107.2        122.4

Earnings available for common
  stock(3).......................      121.5      122.9      131.0      130.3      165.1        132.0         48.9         44.6

Basic earnings per weighted
  average common share...........       1.50       1.52       1.62       1.61       2.04         1.63         0.63         0.57

Dividend declared per share......       1.33       1.33       1.33       1.33       1.33         1.33         0.67         0.67

Common stock and retained
  earnings(4)....................      921.2      937.5      961.6      985.0    1,043.4      1,043.4        962.6        962.6

Preferred stock(4)...............       50.0       49.9       49.4       49.3        0.0          0.0          0.0          0.0

Long-term debt (excluding amount
  due within one year)(4)........      730.6      843.9      829.3      841.9      935.6      1,108.6        934.7      1,107.7
</TABLE>

- ------------------------

(1) Pro forma to give effect to the July 1, 1999 acquisition of Tejas Transok
    Holding, L.L.C. and its subsidiaries by Enogex. The pro forma income
    statement data gives effect to the acquisition as if it had occurred at the
    beginning of the period presented. The pro forma balance sheet data at June
    30, 1999 gives effect to the acquisition as if it had occurred at June 30,
    1999. The pro forma balance sheet data at December 31, 1998 gives effect to
    the transaction as if it had occurred at December 31, 1998. The pro forma
    information does not give effect to the sale of the preferred securities and
    the application of the proceeds of the offering.

(2) Pre-tax operating income is operating revenues less the aggregate of fuel
    costs, purchased power and gas, electricity purchased for resale, other
    operation and maintenance expenses, depreciation and amortization and taxes
    other than income taxes.

(3) Net income less preferred stock dividends.

(4) End of period.

                       RATIO OF EARNINGS TO FIXED CHARGES
<TABLE>
<CAPTION>
                                                                    YEAR ENDED DECEMBER 31,
                                                     -----------------------------------------------------    1998 PRO
                                                       1994       1995       1996       1997       1998         FORMA
                                                     ---------  ---------  ---------  ---------  ---------  -------------
<S>                                                  <C>        <C>        <C>        <C>        <C>        <C>
Ratio of Earnings to Fixed Charges.................       3.57       3.46       4.04       4.09       4.80         2.90

<CAPTION>
                                                           6 MONTHS ENDED
                                                           JUNE 30, 1999
                                                     --------------------------
                                                       ACTUAL       PRO FORMA
                                                     -----------  -------------
<S>                                                  <C>          <C>
Ratio of Earnings to Fixed Charges.................        4.47          2.08
</TABLE>

    In computing the ratios, "earnings" consist of earnings from continuing
operations before income taxes, investment tax credit (net) and fixed charges;
"fixed charges" consist principally of interest expense and a calculated portion
of office rentals which is deemed to be representative of the interest factor.
The pro forma ratio of earnings to fixed charges for the year ended December 31,
1998 gives effect to the acquisition of Tejas Transok Holding, L.L.C. as if it
had occurred at January 1, 1998. The pro forma ratio of earnings to fixed
charges for the 6 months ended June 30, 1999 gives effect to the acquisition as
if it had occurred January 1, 1999. The pro forma information does not give
effect to the sale of the preferred securities and the application of the
proceeds of the offering.

                                      S-3
<PAGE>
    The annual interest requirements on the long-term debt of OGE Energy
outstanding at June 30, 1999, were approximately $60.0 million.

                                USE OF PROCEEDS

    All of the net proceeds from the sale of the preferred securities will be
invested by the trust in junior subordinated debt securities of OGE Energy. OGE
Energy will use the proceeds from the sale of the junior subordinated debt
securities to the trust for general corporate purposes, primarily to repay
outstanding short-term borrowings incurred in connection with Enogex's
acquisition of the Transok pipeline. Short-term borrowings aggregated $791.1
million as of August 31, 1999 and had a weighted average interest rate of 5.51%.

                              ACCOUNTING TREATMENT

    The financial statements of the trust will be reflected in OGE Energy's
consolidated financial statements, with the preferred securities reflected on
OGE Energy's balance sheet as a separate line item after total liabilities and
before stockholders' equity, similar to a minority interest.

                           OGE ENERGY CAPITAL TRUST I

    OGE Energy Capital Trust I is a statutory business trust organized under
Delaware law. OGE Energy established this trust by (1) filing a certificate of
trust with the Secretary of State of Delaware on September 29, 1999, and (2)
executing a declaration of trust, which was also signed by the property trustee
and the Delaware trustee.

    The trust is being established for the following purposes only:

    - to issue and sell its common and preferred securities;

    - to use the proceeds from the sale of the common and preferred securities
      to acquire the junior subordinated debt securities of OGE Energy issued
      under the subordinated indenture; and

    - to engage in activities that are directly related to these activities,
      such as registering the transfer of the preferred securities.

    OGE Energy will acquire all of the common securities, which will have a
total liquidation amount equal to at least 3% of the total capital of the trust.

    The trust's business and affairs are conducted by its trustees, which are
Wilmington Trust Company, as Delaware trustee, and two regular trustees. The
regular trustees are employees of OGE Energy. Wilmington Trust Company will also
act as trustee under the guarantee agreement relating to the preferred
securities.

    OGE Energy has the right to appoint, remove and replace the trustees of the
trust. If an event of default occurs under the subordinated indenture, the
holders of a majority in liquidation amount of the preferred securities will
also have this right.

    OGE Energy, as issuer of the junior subordinated debt securities, will pay
all fees and expenses related to the trust and the offering of the preferred
securities. OGE Energy will also pay all ongoing costs, expenses and liabilities
of the trust, except obligations to make distributions and other payments on the
common and preferred securities.

    For additional information concerning the trust, see "Summary Information
Q&A" beginning on page 2 in the accompanying prospectus.

    OGE Energy and the trust anticipate that the trust will not be required to
make any filings with the Securities and Exchange Commission.

                                      S-4
<PAGE>
                                  RISK FACTORS

    Your investment in the preferred securities will involve several risks. You
should carefully consider the following discussion of risks, and the other
information in this prospectus supplement and the accompanying prospectus,
before deciding whether an investment in the preferred securities is suitable
for you.

OGE ENERGY IS NOT REQUIRED TO PAY YOU UNDER THE GUARANTEE AND THE JUNIOR
SUBORDINATED DEBT SECURITIES UNLESS IT FIRST MAKES OTHER REQUIRED PAYMENTS.

    OGE Energy's obligations under the junior subordinated debt securities will
rank junior to all of OGE Energy's senior debt as described on page 13 of the
accompanying prospectus. This means that OGE Energy cannot make any payments on
the junior subordinated debt securities if it defaults on a payment of senior
debt and does not cure the default within the applicable grace period or if the
senior debt becomes immediately due because of a default and has not yet been
paid in full. At August 31, 1999, OGE Energy's senior debt for these purposes
aggregated about $791.6 million. In addition, OGE Energy's obligations under the
junior subordinated debt securities will be effectively subordinated to all
existing and future liabilities of OGE Energy's subsidiaries. At August 31,
1999, approximately $2.108 billion of obligations of OGE Energy's subsidiaries
not included in OGE Energy's senior indebtedness was outstanding.

    OGE Energy's obligations under the guarantee are subordinated to all of its
other liabilities as described on page 19 of the accompanying prospectus. This
means that OGE Energy cannot make any payments on the guarantee if it defaults
on a payment on any of its other liabilities. In addition, in the event of the
bankruptcy, liquidation or dissolution of OGE Energy, its assets would be
available to pay obligations under the guarantee only after OGE Energy made all
payments on its other liabilities.

    Neither the preferred securities, the junior subordinated debt securities
nor the guarantee limit the ability of OGE Energy and its subsidiaries to incur
additional indebtedness or other liabilities, including indebtedness that ranks
senior in priority of payment to the junior subordinated debt securities and the
guarantee. See "Description of the Guarantee--Status of the Guarantee" on page
19 and "Description of the Junior Subordinated Debt Securities--Subordination"
on page 13, of the accompanying prospectus.

OGE ENERGY IS NOT REQUIRED TO PAY YOU UNDER THE GUARANTEE IF THE TRUST DOES NOT
HAVE CASH AVAILABLE.

    The ability of the trust to make payments on the preferred securities is
solely dependent upon OGE Energy making the related payments on the junior
subordinated debt securities to the trust, as owner of the junior subordinated
debt securities, when due.

    If OGE Energy defaults on its obligations to make payments on the junior
subordinated debt securities, the trust will not have sufficient funds to make
payments on the preferred securities. In those circumstances, you will not be
able to rely upon the guarantee for payment of these amounts.

DEFERRAL OF DISTRIBUTIONS WOULD HAVE ADVERSE TAX CONSEQUENCES FOR YOU AND MAY
ADVERSELY AFFECT THE TRADING PRICE OF THE PREFERRED SECURITIES.

    If distributions on the preferred securities are deferred, you will
nonetheless be required to recognize interest income for United States federal
income tax purposes in the form of original issue discount of your ratable share
of the accrued but unpaid interest on the junior subordinated debt securities
held by the trust before you receive any cash distributions relating to this
interest even though you may use the cash method of accounting. In addition, you
will not receive these cash distributions if you sell the preferred securities
before the end of any deferral period or before the record date for
distributions which are paid.

    OGE Energy has no current intention of deferring interest payments on the
junior subordinated debt securities and believes that deferral is a remote
possibility. However, if OGE Energy exercises its right in

                                      S-5
<PAGE>
the future, the preferred securities may trade at a price that does not fully
reflect the value of accrued but unpaid interest on the junior subordinated debt
securities. If you sell the preferred securities during an interest deferral
period, you may not receive the same return on investment as someone else who
continues to hold the preferred securities. In addition, the existence of OGE
Energy's right to defer payments of interest on the junior subordinated debt
securities may mean that the market price for the preferred securities, which
represent undivided beneficial interests in the junior subordinated debt
securities, may be more volatile than other securities that do not have these
rights.

    See "United States Federal Income Tax Consequences" on page 23 of the
accompanying prospectus for more information regarding the tax consequences of
purchasing, holding and selling the preferred securities.

YOU SHOULD NOT RELY ON RECEIVING DISTRIBUTIONS FROM THE PREFERRED SECURITIES
THROUGH THEIR MATURITY DATE--THEY MAY BE REDEEMED AT ANY TIME IF SPECIFIED
CHANGES IN TAX OR INVESTMENT COMPANY LAW OCCUR AND THEY MAY BE REDEEMED AT THE
OPTION OF OGE ENERGY.

    If specified changes, which are more fully described in the accompanying
prospectus, in tax or investment company law occur and specified other
conditions which are more fully described in the accompanying prospectus are
satisfied, all, but not less than all, of the preferred securities could be
redeemed at any time by the trust at a redemption price equal to their aggregate
liquidation price plus any accrued and unpaid distributions. See "Description of
the Preferred Securities--Distribution of the Junior Subordinated Debt
Securities" on page 9 and "--Special Event Redemption" on page 8 of the
accompanying prospectus.

    The preferred securities may be redeemed, in whole, at any time, or in part,
from time to time, at the direction of OGE Energy on or after the date specified
on the cover page of this prospectus supplement, at a redemption price equal to
their aggregate liquidation price plus any accrued and unpaid distributions. You
should assume that this redemption option will be exercised if OGE Energy is
able to refinance the junior subordinated debt securities at a lower interest
rate or it is otherwise in the interest of OGE Energy to redeem the junior
subordinated debt securities. If the junior subordinated debt securities are
redeemed in part, the trust must redeem the preferred securities in an aggregate
liquidation amount equal to the aggregate principal amount of junior
subordinated debt securities to be redeemed. See "Description of the Preferred
Securities--Redemption" on page 7 and "Description of the Junior Subordinated
Debt Securities--Redemption" on page 14 of the accompanying prospectus.

THERE CAN BE NO ASSURANCE AS TO THE MARKET PRICES FOR THE PREFERRED SECURITIES
OR THE JUNIOR SUBORDINATED DEBT SECURITIES; THEREFORE, YOU MAY SUFFER A LOSS.

    OGE Energy cannot give you any assurance as to the market prices for the
preferred securities or the junior subordinated debt securities that may be
distributed in exchange for preferred securities. Accordingly, the preferred
securities that an investor may purchase, whether pursuant to the offer made by
this prospectus supplement and the accompanying prospectus or in the secondary
market, or the junior subordinated debt securities that a holder of preferred
securities may receive in exchange for preferred securities, may trade at a
discount to the price that the investor paid to purchase the preferred
securities. As a result of the right to defer payments on the preferred
securities, the market price of the preferred securities may be more volatile
than the market prices of other securities to which optional deferrals do not
apply.

THERE COULD BE AN ADVERSE TAX CONSEQUENCE TO YOU IF OGE ENERGY TERMINATES THE
TRUST AND DISTRIBUTES JUNIOR SUBORDINATED DEBT SECURITIES TO HOLDERS, RESULTING
IN POSSIBLE TAX AND LIQUIDITY CONSEQUENCES TO YOU.

    OGE Energy has the right to terminate the trust at any time. If OGE Energy
decides to exercise this right, the trust will be liquidated by distributing
junior subordinated debt securities to holders of the common and preferred
securities on a proportionate basis.

                                      S-6
<PAGE>
    Under current United States federal income tax law, a distribution of junior
subordinated debt securities to you on the dissolution of the trust should not
be a taxable event to you. However, if the trust is characterized for United
States federal income tax purposes as an association taxable as a corporation at
the time it is dissolved or if there is a change in law, the distribution of
junior subordinated debt securities to you may be a taxable event to you.

SINCE YOU HAVE LIMITED VOTING RIGHTS, YOU CANNOT PREVENT THE TRUST TRUSTEES FROM
TAKING ACTIONS YOU MAY NOT AGREE WITH.

    You will have limited voting rights. In particular, except for the limited
exceptions described in the accompanying prospectus, only OGE Energy can elect
or remove any of the trustees. See "Description of the Preferred
Securities--Voting Rights; Control of Remedies" on page 9 of the accompanying
prospectus.

YOU MAY NOT BE ABLE TO DIRECTLY ENFORCE RIGHTS AGAINST OGE ENERGY IF AN EVENT OF
DEFAULT OCCURS.

    You may have to rely on the property trustee under the trust agreement of
OGE Energy Capital Trust I to enforce your rights if an event of default under
the subordinated indenture occurs.

    If an event of default under the subordinated indenture occurs and is
continuing, that will also be an event of default under the preferred
securities. In that case, the holders of the preferred securities would have to
rely on the enforcement against OGE Energy by the property trustee of its rights
as holder of the junior subordinated debt securities. The holders of at least
25% in liquidation amount of the preferred securities will have the right to
direct the property trustee to enforce its rights. However, if the property
trustee does not enforce its rights any record holder would then, to the extent
permitted by applicable law, have to take action directly against OGE Energy to
enforce the property trustee's rights. In addition, if an event of default under
the preferred securities occurs that is attributable to OGE Energy's failure to
pay interest or principal on the junior subordinated debentures, a record holder
of the preferred securities may proceed directly against OGE Energy. The holders
of preferred securities will not be able to exercise directly any other remedies
available to the holders of the junior subordinated debt securities unless the
property trustee fails to do so.

                                      S-7
<PAGE>
                           DESCRIPTION OF SECURITIES

    This prospectus supplement summarizes the specific terms and provisions of
the preferred securities, the junior subordinated debt securities and the
guarantee, and supplements the general description of the terms and provisions
of these securities in the accompanying prospectus. These summaries are not
meant to be complete descriptions of each security. However, this prospectus
supplement and the accompanying prospectus do contain the material terms and
conditions of each security.

                   CERTAIN TERMS OF THE PREFERRED SECURITIES

DISTRIBUTIONS

    The preferred securities represent undivided beneficial ownership interests
in the assets of the trust. The only assets of the trust will be the junior
subordinated debt securities. Distributions on the preferred securities are
cumulative and will accrue from the date the preferred securities are first
issued at the annual rate of       %. Distributions will be payable quarterly in
arrears on March 31, June 30, September 30 and December 31 of each year,
beginning         ,  . Distributions will be payable to the holders named on the
securities register of the trust at the close of business on the relevant record
dates, as described under "Description of the Preferred
Securities--Distributions-- Payment of Distributions" on page 7 of the
accompanying prospectus. Distributions not paid when due will accumulate
additional distributions, at the annual rate of    % on the amount of unpaid
distributions, compounded quarterly. When this prospectus supplement or the
accompanying prospectus refers to any payment of distributions, the term
"distributions" includes any additional distributions. The amount of
distributions payable for any period will be computed on the basis of a 360-day
year comprised of twelve 30-day months. The amount of distributions payable for
any period shorter than a full quarterly period will be computed on the basis of
a 30-day month and, for periods of less than a month, the actual number of days
elapsed per 30-day month.

    If distributions are payable on a date that is not a business day, as
defined at the end of this paragraph, payment will be made on the next business
day without any interest or other payment resulting from the delay. However, if
the next business day is in the next calendar year, payment of distributions
will be made on the preceding business day. A "business day" means each day
except Saturday, Sunday and any day on which banking institutions in The City of
New York are authorized or required by law to close.

    Distributions on the preferred securities will only be paid if the trust has
sufficient funds available to make the payments. The income of the trust
available for the payment of distributions will be limited to payments made by
OGE Energy to the trust, as owner of the junior subordinated debt securities.

DEFERRAL OF DISTRIBUTIONS

    OGE Energy may defer interest payments on the junior subordinated debt
securities from time-to-time for one or more periods, each up to five years, but
not beyond the maturity date. If there were a deferral, distributions on the
preferred securities will also be deferred. See "Description of the Preferred
Securities--Distributions--Deferral of Distributions" beginning on page 6 of the
accompanying prospectus for further details.

    OGE Energy does not currently intend to defer interest payments on the
junior subordinated debt securities. However, if OGE Energy does defer interest
payments, it will be subject to restrictions relating to the payment of
dividends on, or purchases of, its capital stock and payments on debt (including
any guarantee) that ranks equal with or junior to the junior subordinated debt
securities. See "Description of the Junior Subordinated Debt Securities--Option
to Defer Interest Payments" on page 15 of the accompanying prospectus for
further details.

                                      S-8
<PAGE>
    If OGE Energy chooses to defer payments of interest on the junior
subordinated debt securities, the junior subordinated debt securities would at
that time be treated as having been reissued with original issue discount for
United States federal income tax purposes. This means you will be required to
include accrued interest income in gross income for United States federal income
tax purposes in the form of original issue discount before you receive cash
distributions even though you may use the cash method of accounting. This
treatment will apply as long as you own preferred securities. See "United States
Federal Income Tax Consequences--Interest Income and Original Issue Discount"
beginning on page 24 of the accompanying prospectus.

REDEMPTION

    OGE Energy may redeem the junior subordinated debt securities before their
maturity:

    - in whole or in part on one or more occasions any time on or after
        , 20  ; and

    - in whole at any time, if specified changes in tax or investment company
      law occur as described more fully under "Description of the Preferred
      Securities--Special Event Redemption" on page 8 of the accompanying
      prospectus).

    When OGE Energy makes a payment on the junior subordinated debt securities,
either at maturity on           , 20  or upon early redemption in whole or in
part, the trust will use the cash it receives to pay at maturity or redeem a
liquidation amount of the preferred and common securities equal to the principal
amount of junior subordinated debt securities paid. The redemption price for the
junior subordinated debt securities is 100% of their principal amount plus
accrued and unpaid interest.

    If less than all the preferred and common securities are redeemed, the
aggregate liquidation amount of preferred and common securities to be redeemed
will be allocated proportionately among the preferred and common securities,
subject to the exceptions described under "--Subordination of Common Securities"
on page S-10. The preferred securities to be redeemed will be selected by the
property trustee on a basis that it deems to be fair and appropriate, including
by lot.

REDEMPTION PROCEDURES

    To the extent funds are available for payment, the trust will irrevocably
deposit with DTC sufficient funds to pay the redemption amount for the preferred
securities being redeemed. The trust will also give DTC irrevocable instructions
and authority to pay the redemption amount to the preferred securities holders.
Any distribution to be paid on or before a redemption date for any preferred
securities called for redemption will be payable to the registered holders on
the record date for the distribution.

OPTIONAL LIQUIDATION OF THE TRUST AND DISTRIBUTION OF JUNIOR SUBORDINATED DEBT
  SECURITIES

    OGE Energy may dissolve the trust at any time, and after paying the
creditors of the trust may cause the junior subordinated debt securities to be
distributed to the holders of the preferred securities in exchange for the
preferred securities.

    Assuming that the trust is not taxable as a corporation, a distribution of
junior subordinated debt securities upon a liquidation of the trust would not be
a taxable event to holders of the preferred securities. If, however, the trust
were subject to United Stated federal income tax for income accrued or received
on the junior subordinated debt securities, the distribution of junior
subordinated debt securities by the trust would be a taxable event to the trust
and you.

    If OGE Energy elects to dissolve the trust and causes the junior
subordinated debt securities to be distributed to the holders of the preferred
securities in exchange for the preferred securities, OGE Energy will continue to
have the right to redeem the junior subordinated debt securities as described

                                      S-9
<PAGE>
under "Description of the Junior Subordinated Debt Securities--Redemption" on
page 14 of the accompanying prospectus for more information.

SUBORDINATION OF COMMON SECURITIES

    Payment of distributions or any redemption or liquidation amounts regarding
the preferred and common securities will be made proportionately between the
holders of common securities and the holders of preferred securities based on
the aggregate liquidation amounts of the preferred and common securities.
However, if OGE Energy is in default under the subordinated indenture, no
payments may be made on the common securities until all unpaid amounts on the
preferred securities have been provided for or paid in full.

MERGERS, CONSOLIDATIONS OR AMALGAMATIONS

    OGE Energy Capital Trust I may not consolidate, amalgamate, merge with or
into, or be replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to any corporation or other body, except as
described below. OGE Energy Capital Trust I may at the request of OGE Energy,
with the consent of the regular trustees and without the consent of the holders
of the trust securities, the property trustee or the Delaware trustee,
consolidate, amalgamate, merge with or into, or be replaced by or convey,
transfer or lease its properties and assets substantially as an entirety to a
trust organized as such under the laws of any state; provided, that:

    - the successor entity either (1) expressly assumes all of the obligations
      of OGE Energy Capital Trust I with respect to the preferred securities, or
      (2) substitutes for the preferred securities successor securities having
      substantially the same terms as the preferred securities, so long as the
      successor securities rank the same as the preferred securities rank in
      priority with respect to distributions and payments upon liquidation,
      redemption and otherwise;

    - OGE Energy expressly appoints a trustee of the successor entity possessing
      the same powers and duties as the property trustee as the holder of the
      junior subordinated debt securities;

    - the preferred securities or the successor securities are listed or traded,
      or they will be listed upon notification of issuance, on any national
      securities exchange or other organization on which the preferred
      securities are then listed or traded;

    - the transaction does not cause the preferred securities or the successor
      securities to be downgraded by a nationally recognized statistical rating
      organization;

    - the transaction does not adversely affect the rights, preferences and
      privileges of the holders of the preferred securities or the successor
      securities in any material respect;

    - the successor entity has a purpose substantially identical to that of OGE
      Energy Capital Trust I;

    - prior to the transaction, OGE Energy has received an opinion of counsel to
      the effect that (1) the transaction does not adversely affect the rights,
      preferences and privileges of the holders of the preferred securities or
      any successor securities in any material respect, (2) following the
      transaction neither OGE Energy Capital Trust I nor the successor entity
      will be required to register as an "investment company" under the
      Investment Company Act and (3) following the transaction, OGE Energy
      Capital Trust I or the successor entity will continue to be classified as
      a grantor trust for United States federal income tax purposes;

    - OGE Energy or a permitted successor owns all the common securities of the
      successor entity and guarantees the obligations of the successor entity
      under the successor securities at least to the extent provided by the
      preferred securities guarantee; and

                                      S-10
<PAGE>
    - the successor entity assumes all of the obligations of OGE Energy Capital
      Trust I with respect to the trustees.

Notwithstanding the foregoing, OGE Energy Capital Trust I may not, except with
the consent of holders of all of the preferred securities, consolidate,
amalgamate, merge with or into, or be replaced by or convey, transfer or lease
its properties and assets substantially as an entirety to any other entity or
permit any other entity to consolidate, amalgamate, merge with or into, or
replace it unless OGE Energy Capital Trust I obtains a tax opinion to the effect
that the transaction would not cause OGE Energy Capital Trust I or the successor
entity to be classified as other than a grantor trust for United States federal
income tax purposes.

    Any corporation or other body into which either the property trustee or the
Delaware trustee may be merged or converted or with which it may be
consolidated, or any corporation resulting from any merger, conversion or
consolidation or any corporation succeeding to all or substantially all the
corporate trust business of either trustee, will be the successor of that
trustee under the trust agreement, provided the resulting or surviving entity is
otherwise qualified and eligible under the trust agreement.

CERTIFICATED SECURITIES--REGISTRATION, TRANSFER AND PAYMENT

    If the trust issues certificated securities, each one will be registered in
the name of the relevant security holder. The preferred securities may be
transferred or exchanged without the payment of any service charge, other than
any tax or other governmental charge, by contacting the property trustee,
Wilmington Trust Company, Rodney Square North, 1100 North Market Street,
Wilmington, Delaware 19890-0001 Attention: Corporate Trust Administration.

    Distribution payments on certificated preferred securities will be made by
check. Payment of the redemption price or liquidation amount will be made in
immediately available funds when you surrender a preferred security.

            CERTAIN TERMS OF THE JUNIOR SUBORDINATED DEBT SECURITIES

    The junior subordinated debt securities will be issued under the
subordinated indenture.

    The preferred securities, the junior subordinated debt securities and the
guarantee do not limit the ability of OGE Energy and its subsidiaries to incur
additional indebtedness or other liabilities, including indebtedness that ranks
senior in priority of payment to the subordinated debentures and the guarantee.
At August 31, 1999, approximately $791.6 million of senior debt of OGE Energy
was outstanding. In addition, the junior subordinated debt securities will be
effectively subordinated to all existing and future obligations of OGE Energy's
subsidiaries. At August 31, 1999, approximately $2.108 billion of obligations of
OGE Energy's subsidiaries not included in OGE Energy's senior indebtedness was
outstanding.

    The junior subordinated debt securities may be redeemed by OGE Energy as
described above under "Certain Terms of the Preferred Securities--Redemption".

INTEREST RATE AND MATURITY

    The junior subordinated debt securities will mature on         , 20  and
will bear interest at the annual rate of   %, payable quarterly in arrears on
March 31, June 30, September 30 and December 31 of each year, beginning
        ,     . Interest payments not paid when due will accrue additional
interest at the annual rate of   % on the amount of unpaid interest, to the
extent permitted by law, compounded quarterly. The interest payment provisions
of the junior subordinated debt securities correspond to the distribution
provisions of the preferred securities. The junior subordinated debt securities
do not have a sinking fund. This means that OGE Energy is not required to make
any principal payments on the junior subordinated debt securities prior to
maturity.

                                      S-11
<PAGE>
DISTRIBUTION OF JUNIOR SUBORDINATED DEBT SECURITIES

    If the property trustee distributes the junior subordinated debt securities
to the preferred and common securities holders upon the dissolution and
liquidation of the trust, the junior subordinated debt securities will be issued
in denominations of $25 principal amount and integral multiples thereof. OGE
Energy anticipates that the junior subordinated debt securities would be
distributed in the form of one or more global securities, and DTC, or any
successor depositary for the preferred securities, would act as depositary for
the junior subordinated debt securities. The depositary arrangements for the
junior subordinated debt securities would be substantially similar to those in
effect for the preferred securities.

    For a description of DTC and the terms of the depositary arrangements
relating to payments, transfers, voting rights, redemption and other notices and
other matters, see "Description of the Preferred Securities--Book-Entry Only
Issuance--The Depository Trust Company" beginning on page 11 of the accompanying
prospectus.

OPTION TO DEFER INTEREST PAYMENTS

    OGE Energy does not currently intend to defer interest payments on the
junior subordinated debt securities. If, however, OGE Energy does decide to
defer interest payments, it could do so from time to time. No particular
deferral period may exceed five years or extend beyond maturity.

    During a deferral period, interest will continue to accrue on the junior
subordinated debt securities, compounded quarterly, and deferred interest
payments will accrue additional interest to the extent permitted by law. No
interest will be due and payable on the junior subordinated debt securities
until the end of the deferral period except upon a redemption of the junior
subordinated debt securities during a deferral period.

    OGE Energy may pay at any time all or any portion of the interest accrued to
that point during a deferral period.

    Once OGE Energy makes all interest payments on the junior subordinated debt
securities, including accrued and unpaid interest, it can again defer interest
payments on the junior subordinated debt securities for a period of up to five
years as described above.

    See "Description of the Junior Subordinated Debt Securities--Option to Defer
Interest Payments" beginning on page 15 of the accompanying prospectus.

                                      S-12
<PAGE>
                              BOOK-ENTRY ISSUANCE

    The preferred securities will be represented by one or more global
securities that will be deposited with and registered in the name of DTC or its
nominee. This means that the trust will not issue certificates to you for the
preferred securities. See "Description of the Preferred Securities-- Book-Entry
Only Issuance--The Depository Trust Company" beginning on page 11 of the
accompanying prospectus.

EUROCLEAR AND CEDELBANK

    Links have been established among DTC, Cedelbank and Euroclear, to
facilitate the initial issuance of the preferred securities and cross-market
transfers of the preferred securities associated with secondary market trading.

    Although DTC, Cedelbank and Euroclear have agreed to the procedures provided
below in order to facilitate transfers of the preferred securities among their
participants, they are under no obligation to perform or continue to perform
those procedures and those procedures may be modified or discontinued at any
time. Cedelbank and Euroclear will hold interests on behalf of their
participants through customers' securities accounts in Cedelbank's and
Euroclear's names on the books of their respective depositaries, which in turn
will hold those interests in customers' securities accounts in the depositories'
names on the books of DTC.

    When preferred securities are to be transferred from the account of a DTC
participant to the account of a Cedelbank participant or a Euroclear
participant, the purchaser must send instructions to Cedelbank or Euroclear
through a participant at least one business day prior to settlement. Cedelbank
or Euroclear, as the case may be, will instruct the relevant U.S. depositary to
receive the preferred securities against payment. Payment will then be made by
that U.S. depositary to the DTC participant's account against delivery of the
preferred securities. After settlement has been completed, the preferred
securities will be credited to the respective clearing system and by the
clearing system, in accordance with its usual procedures, to the Cedelbank
participant's or Euroclear participant's account. Credit for the preferred
securities will appear in European time on the next day.

    Because the settlement is taking place during New York business hours, DTC
participants can employ their usual procedures for sending preferred securities
to the relevant U.S. depositary for the benefit of Cedelbank participants or
Euroclear participants. The sale proceeds will be available to the DTC seller on
the settlement date. Thus, to the DTC participant, a cross market transaction
will settle no differently than a trade between two DTC participants.

    Due to time zone differences in their favor, Cedelbank participants or
Euroclear participants may employ their customary procedures for transactions in
which preferred securities are to be transferred by the respective clearing
system through the relevant U.S. depositary to another DTC participant. The
seller must send instructions to Cedelbank or Euroclear through a participant at
least one business day prior to settlement. In these cases, Cedelbank or
Euroclear will instruct its U.S. depositary to credit the preferred securities
to the DTC participant's account against payment. The payment will then be
reflected in the account of the Cedelbank participant or Euroclear participant
the following day, and receipt of the cash proceeds in the Cedelbank
participant's or Euroclear participant's account will be back-valued to the
value date (which would be the preceding day, when settlement occurs in New
York). If the Cedelbank participant or Euroclear participant has a line of
credit with its respective clearing system and elects to draw on that line of
credit in anticipation of receipt of the sale proceeds in its account, the
back-valuation may substantially reduce or offset any overdraft charges incurred
over the one-day period. If settlement is not completed on the intended value
date (that is, the trade fails), receipt of the cash proceeds in the Cedelbank
participant's or Euroclear participant's account would instead be valued as of
the actual settlement date.

                                      S-13
<PAGE>
                                  UNDERWRITING

    Subject to the terms and conditions set forth in the form of underwriting
agreement which was filed as an exhibit to the registration statement under
which the preferred securities are being offered and sold, the trust has agreed
to sell to each of the underwriters named below, the number of preferred
securities set forth opposite its name below:

<TABLE>
<CAPTION>
                                                                                PREFERRED
                                                                                SECURITIES
                                                                            ------------------
<S>                                                                         <C>
Lehman Brothers Inc.......................................................      $
A.G. Edwards & Sons, Inc..................................................
CIBC World Markets Corp...................................................
Merrill Lynch, Pierce, Fenner & Smith
           Incorporated...................................................
Morgan Stanley Dean Witter................................................
Prudential Securities Incorporated........................................
                                                                                  --------
                                                                                  --------
                                                                                  --------
</TABLE>

    The underwriters have advised the trust that they propose to initially offer
the preferred securities to the public at the public offering price of $25 per
preferred security; they may also offer preferred securities to dealers at that
price less a concession not in excess of $0.  per preferred security or $0.  per
preferred security with respect to some institutions. The underwriters may
allow, and those dealers may reallow a concession not in excess of $0.  per
preferred security to some other dealers. After the initial public offering of
the preferred securities is completed, the public offering price and such
concessions may be changed.

    Because the proceeds from the sale of the preferred securities will be used
to purchase the subordinated debentures, OGE Energy has agreed to pay to the
underwriters an underwriting commission of $    per preferred security (a total
of $      ); except that for sales of preferred securities to specified
institutions the underwriting commission will be $0.  per preferred security.
Therefore, to the extent of those sales, the actual amount of commission will be
less than the aggregate amount specified in the preceding sentence.

    OGE Energy will pay specified expenses, expected to be approximately
$        , associated with the offer and sale of the preferred securities.

    OGE Energy has agreed to indemnify the underwriters against specified
liabilities, including liabilities under the Securities Act of 1933.

    In connection with the offering, the rules of the SEC permit the
underwriters to engage in specified transactions that stabilize the price of the
preferred securities. These transactions may consist of bids or purchases for
the purpose of pegging, fixing or maintaining the price of the preferred
securities. If the underwriters create a short position in the preferred
securities in connection with the offering (that is, if they sell a larger
number of the preferred securities than is set forth on the cover page of this
prospectus supplement), the underwriters may reduce that short position by
purchasing preferred securities in the open market.

    In general, purchases of a security for the purpose of stabilization or to
reduce a syndicate short position could cause the price of the security to be
higher than it might otherwise be in the absence of those purchases. Neither the
trust nor any of the underwriters makes any representation or prediction as to
the direction or magnitude of any effect that the transactions described above
may have on the price of the preferred securities. In addition, neither the
trust nor any of the underwriters makes any representation that the underwriters
will in fact engage in those transactions, or that those transactions, once
begun, will not be discontinued without notice.

                                      S-14
<PAGE>
NEW YORK STOCK EXCHANGE LISTING

    Before this offering, there has been no established public trading market
for the preferred securities. Application will be made to list the preferred
securities on the NYSE. If listed, trading of the preferred securities is
expected to begin within 30 days of the issuance of the preferred securities. In
order to meet all of the requirements for listing the preferred securities on
the NYSE, the underwriters have agreed to sell the preferred securities to a
minimum of 400 beneficial holders. The underwriters have advised OGE Energy that
they intend to make a market in the preferred securities prior to the
commencement of trading on the NYSE. However, the underwriters are not obligated
to do so and may discontinue market making at any time without notice. No
assurance can be given about the liquidity of the trading market for the
preferred securities.

NO SALES OF SIMILAR SECURITIES

    OGE Energy and the trust have agreed that for 30 business days after the
date of this prospectus supplement they will not directly or indirectly offer,
sell, offer to sell, grant any option for the sale of or otherwise dispose of
any preferred securities or junior subordinated debt securities or any
securities convertible or exchangeable into, or exercisable for preferred
securities or junior subordinated debt securities or any debt securities
substantially similar to junior subordinated debt securities or any equity
securities substantially similar to the preferred securities, except for the
preferred securities and junior subordinated debt securities described in this
prospectus supplement, without the prior written consent of Lehman Brothers Inc.

    Some of the underwriters are affiliated with commercial banking institutions
that may from time to time in the ordinary course of their businesses loan money
to and have customary banking relationships with OGE Energy and its affiliates.

CONFIRMATION TO DISCRETIONARY ACCOUNTS NOT PERMITTED

    The underwriters may not confirm sales to any account over which they
exercise discretionary authority without the prior written approval of the
customer.

UNITED KINGDOM SELLING RESTRICTIONS

    Each underwriter has represented and agreed that (i) it has not offered or
sold and prior to the date six months after the date of issue of the preferred
securities will not offer or sell preferred securities in the United Kingdom
except to persons whose ordinary activities involve them in acquiring, holding,
managing or disposing of investments (as principal or agent) for the purposes of
their businesses or otherwise in circumstances which have not resulted and will
not result in an offer to the public in the United Kingdom within the meaning of
the public offers of Securities Regulations 1995; (ii) it has complied and will
comply with all applicable provisions of the Financial Services Act 1986 with
respect to anything done by it in relation to the preferred securities in, from
or otherwise involving the United Kingdom; and (iii) it has only issued or
passed on, and will only issue or pass on, in the United Kingdom any document
received by it in connection with the issue of the preferred securities to a
person who is a kind described in Article 11(3) of the Financial Services Act
1986 (Investment Advertisement) (Exemptions) Order 1996 or is a person to whom
the document may otherwise lawfully be issued or passed on.

                                      S-15
<PAGE>
PROSPECTUS

                                  $200,000,000

                           OGE ENERGY CAPITAL TRUST I

                          OGE ENERGY CAPITAL TRUST II

                              PREFERRED SECURITIES

    Fully and Unconditionally Guaranteed, to the Extent Set Forth Herein, By

                                OGE ENERGY CORP.

                                ---------------

    OGE Energy will provide the specific terms of these securities in
supplements to this prospectus. You should read this prospectus and the
accompanying prospectus supplement carefully before you invest.

    The securities offered by this prospectus are offered in an aggregate
liquidation amount of up to $200,000,000 subject to reduction as a result of the
sale under specified circumstances of other securities.

    YOU ARE URGED TO CAREFULLY READ THE "RISK FACTORS" SECTION IN THE APPLICABLE
PROSPECTUS SUPPLEMENT, WHERE SPECIFIC RISKS ASSOCIATED WITH THESE PREFERRED
SECURITIES ARE DESCRIBED, ALONG WITH THE OTHER INFORMATION IN THIS PROSPECTUS
AND THE PROSPECTUS SUPPLEMENT BEFORE YOU MAKE YOUR INVESTMENT DECISION.

                            ------------------------

   NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
        COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR
         DETERMINED IF THIS PROSPECTUS OR ANY ACCOMPANYING PROSPECTUS
         SUPPLEMENT IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO
                      THE CONTRARY IS A CRIMINAL OFFENSE.

                            ------------------------

    This prospectus may not be used to consummate sales of the offered
securities unless accompanied by a prospectus supplement.

October 13, 1999
<PAGE>
                            SUMMARY INFORMATION-Q&A

    This summary provides a brief overview of the key aspects of OGE Energy
Corp., each OGE Energy Capital Trust and the preferred securities. The terms
"trust" and "OGE Energy Capital Trust" refer to the OGE Energy Capital Trust for
a specific transaction. You should carefully read this prospectus to understand
fully the terms of the preferred securities as well as the tax and other
considerations that are important to you in making a decision about whether to
invest in the preferred securities. You should pay special attention to the
"Risk Factors" section in the applicable prospectus supplement to determine
whether an investment in the preferred securities is appropriate for you.

WHAT ARE THE PREFERRED SECURITIES?

    Each preferred security represents an undivided beneficial interest in the
assets of a trust. Each preferred security will entitle the holder to receive
cash distributions as described in this prospectus.

WHO IS THE TRUST?

    The trust is a Delaware statutory business trust. Its principal place of
business is c/o OGE Energy Corp., 321 North Harvey Avenue, P.O. Box 321,
Oklahoma City, Oklahoma 73101-0321, and its telephone number is (405) 553-3000.

    All the common securities of the trust will be owned by OGE Energy. The
trust will use the proceeds from the sale of the preferred securities and the
common securities to buy a series of junior subordinated deferrable interest
debentures from OGE Energy with the same financial terms as the preferred
securities.

    There are two regular trustees of the trust who are officers of OGE Energy.
Wilmington Trust Company will act as the Delaware trustee and the property
trustee of the trust.

WHO IS OGE ENERGY CORP.?

    OGE Energy is a public utility holding company, which was incorporated in
August 1995 in the State of Oklahoma. The Company serves as the parent company
to Oklahoma Gas and Electric Company, which operates under the trade name OG&E
Electric Services, and Enogex Inc. and any other companies that may be formed
within the organization in the future.

    The Company's principal subsidiary is OG&E and, accordingly, the Company's
financial results and condition are substantially dependent at this time on the
financial results and condition of OG&E. OG&E is a regulated public utility
engaged in the generation, transmission and distribution of electricity to
retail and wholesale customers. OG&E was incorporated in 1902 under the laws of
the Oklahoma Territory and is the largest electric utility in the State of
Oklahoma. OG&E sold its retail gas business in 1928 and now owns and operates an
interconnected electric production, transmission and distribution system which
includes eight active generating stations with a total capability of 5,561,180
kilowatts.

    Enogex owns and operates approximately 9,700 miles of natural gas
transmission and gathering pipelines, has interests in fifteen gas processing
plants, markets electricity, natural gas and natural gas products and invests in
the drilling for and production of crude oil and natural gas.

    Enogex completed its acquisition of Tejas Transok Holding, L.L.C., a
gatherer, processor, and transporter of natural gas in Oklahoma and Texas on
July 1, 1999. Transok's principal assets included approximately 4,900 miles of
natural gas pipelines in Oklahoma and Texas with a capacity of approximately 1.2
billion cubic feet per day and 18 billion cubic feet of underground gas storage.
Transok also owned 9 gas processing plants, which produced approximately 25,000
barrels per day of natural gas liquids in 1998. Enogex purchased Transok from
Tejas Energy L.L.C. of Houston, an

                                       2
<PAGE>
affiliate of Shell Oil Company, for approximately $710.3 million, which included
assumption of $173 million of long-term debt.

    OGE Energy's principal executive office is at 321 North Harvey Avenue, P.O.
Box 321, Oklahoma City, Oklahoma 73101-0321, and its telephone number is (405)
553-3000.

WHEN WILL YOU RECEIVE DISTRIBUTIONS ON THE PREFERRED SECURITIES?

    The trust's only source of cash to make payments on the preferred securities
are payments on the junior subordinated debt securities it purchases from OGE
Energy.

    If you purchase the preferred securities, you are entitled to receive
cumulative cash distributions at the rate specified in the applicable prospectus
supplement. Distributions will accumulate from the date the trust issues the
preferred securities and will be paid in arrears on the dates specified in the
prospectus supplement, unless distributions are deferred as described below.

WHEN WILL PAYMENT OF YOUR DISTRIBUTIONS BE DEFERRED?

    OGE Energy may from time to time defer payments of interest on the junior
subordinated debt securities for one or more periods, each of up to five years.
If OGE Energy defers interest payments on the junior subordinated debt
securities, the trust will also defer distributions on the preferred securities
during the deferral period. A deferral of distributions cannot extend, however,
beyond the maturity date of the junior subordinated debt securities.

    During any deferral period, except as described beginning on page 15, OGE
Energy will not be permitted to:

    - pay a dividend or make any distributions on its capital stock;

    - redeem, purchase or make a liquidation payment on any of its capital
      stock;

    - make an interest, principal or premium payment on, or repay, repurchase or
      redeem, any of its debt securities that rank equal with or junior to the
      junior subordinated debt securities; or

    - make any guarantee payment with respect to any guarantee of debt
      securities of any subsidiary, if that guarantee ranks equally with or
      junior to the junior subordinated debt securities.

WHAT IS OGE ENERGY'S GUARANTEE OF THE PREFERRED SECURITIES?

    OGE Energy's guarantee of the preferred securities consists of:

    - its obligations under the subordinated indenture to make payments on the
      junior subordinated debt securities;

    - its obligations under the preferred securities guarantee; and

    - its obligations under the amended and restated declaration of trust, which
      sets forth the terms of the trust.

    OGE Energy will irrevocably guarantee that if a payment on the junior
subordinated debt securities is made to the trust but, for any reason, the trust
does not make the corresponding distribution or redemption payment to the
holders of the preferred securities, then OGE Energy will make the payments
directly to the holders of the preferred securities. The guarantee will not
cover payments when the trust does not have sufficient funds to make payments on
the preferred securities.

    OGE Energy's obligations under the guarantee are subordinated as described
on page 19.

                                       3
<PAGE>
WHEN COULD THE JUNIOR SUBORDINATED DEBT SECURITIES BE DISTRIBUTED TO YOU?

    OGE Energy has the right to dissolve the trust at any time. If OGE Energy
terminates the trust, the trust will distribute junior subordinated debt
securities to the holders of the common and preferred securities of the trust on
a proportionate basis.

WILL THE PREFERRED SECURITIES BE LISTED ON A STOCK EXCHANGE?

    If specified in an accompanying prospectus supplement, application will be
made to list the preferred securities on the New York Stock Exchange. If
approved for listing, the trust expects the preferred securities will begin
trading within 30 days after they are first issued.

WILL HOLDERS OF THE PREFERRED SECURITIES HAVE ANY VOTING RIGHTS?

    Generally, the holders of the preferred securities will not have any voting
rights. See "Description of the Preferred Securities--Voting Rights."

IN WHAT FORM WILL THE PREFERRED SECURITIES BE ISSUED?

    The preferred securities will be represented by one or more global
securities that will be deposited with and registered in the name of The
Depository Trust Company or its nominee. This means that you will not receive a
certificate for your preferred securities and that your broker will maintain
your position in the preferred securities.

    YOU SHOULD RELY ONLY ON THE INFORMATION PROVIDED IN THIS PROSPECTUS AND THE
ACCOMPANYING PROSPECTUS SUPPLEMENT, AS WELL AS THE INFORMATION INCORPORATED BY
REFERENCE. OGE ENERGY HAS NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH DIFFERENT
INFORMATION. OGE ENERGY IS NOT MAKING AN OFFER OF THESE SECURITIES IN ANY
JURISDICTION WHERE THE OFFER IS NOT PERMITTED. YOU SHOULD NOT ASSUME THAT THE
INFORMATION IN THIS PROSPECTUS, THE ACCOMPANYING PROSPECTUS SUPPLEMENT OR ANY
DOCUMENTS INCORPORATED BY REFERENCE IS ACCURATE AS OF ANY DATE OTHER THAN THE
DATE OF THE APPLICABLE DOCUMENT.

                                       4
<PAGE>
                      WHERE YOU CAN FIND MORE INFORMATION

    As required by the Securities Act of 1933, OGE Energy filed a registration
statement (No. 333-88415) relating to the securities offered by this prospectus
and the relevant prospectus supplement with the Securities and Exchange
Commission. This prospectus is a part of that registration statement, which
includes additional information.

    OGE Energy files annual, quarterly and current reports, proxy statements and
other information with the SEC. You may read and copy any document OGE Energy
files at the SEC's public reference rooms in Washington, D.C., New York, New
York and Chicago, Illinois. You can also request copies of the documents, upon
payment of a duplicating fee, by writing the Public Reference Section of the
SEC. Please call the SEC at 1-800-SEC-0330 for further information on the public
reference rooms. These SEC filings are also available to the public from the
SEC's web site at http://www.sec.gov.

    The SEC allows OGE Energy to "incorporate by reference" the information it
files with the SEC, which means that it can disclose important information to
you by referring you to those documents. The information incorporated by
reference is considered to be part of this prospectus. Information that OGE
Energy files later with the SEC will automatically update information in this
prospectus. In all cases, you should rely on the later information over
different information included in this prospectus or the prospectus supplement.
OGE Energy incorporates by reference in the registration statement 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:

    - Annual Report on Form 10-K for the year ended December 31, 1998, filed
      with the SEC on March 30, 1999;

    - Quarterly Report on Form 10-Q for the quarter ended March 31, 1999, filed
      with the SEC on May 14, 1999;

    - Quarterly Report on Form 10-Q for the quarter ended June 30, 1999, filed
      with the SEC on August 16, 1999; and

    - Current Reports on Form 8-K, filed with the SEC on May 20, July 9, July 13
      (as amended September 14) and July 16, 1999.

    All documents OGE Energy files pursuant to Section 13(a), 13(c), 14 or 15(d)
of the Exchange Act after the date of this prospectus and before the later of
(1) the completion of the offering of the securities described in this
prospectus and (2) the date OGE Energy stops offering securities pursuant to
this prospectus shall be incorporated by reference in this prospectus from the
date of filing of those documents.

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

       Treasurer
       OGE Energy Corp.
       321 North Harvey Avenue, P.O. Box 321
       Oklahoma City, Oklahoma 73101-0321
       (405) 553-3000

                                USE OF PROCEEDS

    All of the net proceeds from the sale of the preferred securities will be
invested by the trust in junior subordinated debt securities of OGE Energy. OGE
Energy will use the proceeds from the sale of the junior subordinated debt
securities to the trust for general corporate purposes, primarily to fund its
operating units and subsidiaries. The specific allocation of the proceeds of a
particular series of junior subordinated debt securities will be described in
the applicable prospectus supplement.

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                    DESCRIPTION OF THE PREFERRED SECURITIES

    The preferred securities will be issued under an amended and restated
declaration of trust. The declaration will be qualified under the Trust
Indenture Act of 1939. Wilmington Trust Company will act as trustee under the
declaration for purposes of the Trust Indenture Act. The terms of the preferred
securities will include those stated in the declaration and those made part of
the declaration by the Trust Indenture Act. The following summary of the terms
of the preferred securities is not intended to be complete and is qualified by
the applicable prospectus supplement, the declaration, the Trust Indenture Act
and other applicable law. The declaration will be filed as an exhibit to a
document incorporated by reference in the registration statement of which this
prospectus forms a part.

GENERAL

    The declaration authorizes the regular trustees to issue both common and
preferred securities representing undivided beneficial interests in the assets
of the trust. All the common securities will be owned by OGE Energy. Absent an
event of default, the common securities rank equally, and payments will be made
on the common securities on a ratable basis, with the preferred securities. If
an event of default under the indenture occurs and continues, however, the
rights of the holders of the common securities to receive payments of periodic
distributions and payments upon liquidation, redemption and otherwise will be
subordinated to the rights of the holders of the preferred securities. The
declaration does not permit the issuance of any other securities or the
incurrence of any indebtedness by the trust.

    Pursuant to the declaration, the property trustee will hold title to the
junior subordinated debt securities purchased by the trust for the benefit of
the holders of the trust securities. The payment of distributions out of money
held by the trust, and payments upon redemption of the trust securities or
liquidation of the trust out of money held by the trust, are guaranteed by OGE
Energy to the extent described under "Description of the Guarantee." The
guarantee will be held by Wilmington Trust Company, the guarantee trustee, for
the benefit of the holders of the preferred securities. The guarantee does not
cover payment of distributions when the trust does not have sufficient available
funds to pay those distributions. In that event, the remedy of a holder of
preferred securities is to:

    - vote to direct the property trustee to enforce the property trustee's
      rights under the junior subordinated debt securities; or

    - if the failure of the trust to pay distributions is attributable to the
      failure of OGE Energy to pay interest or principal on the junior
      subordinated debt securities, directly sue OGE Energy for enforcement of
      payment to the holder of an amount equal to the aggregate liquidation
      amount of his or her preferred securities.

DISTRIBUTIONS

    Distributions on the preferred securities will accrue at the rate specified
in the applicable prospectus supplement. The amount of distributions payable for
any period will be computed on the basis of a 360-day year of twelve 30-day
months. The amount of interest payable for any period shorter than a full
quarterly period will be computed on the basis of a 30-day month and, for
periods of less than a full month, the actual number of days elapsed per 30-day
month.

    Distributions on the preferred securities will be cumulative, will accrue
from the date the trust issues the preferred securities and will be paid in
arrears on the dates specified in the applicable prospectus supplement, unless
they are deferred as described below.

    DEFERRAL OF DISTRIBUTIONS.  OGE Energy has the right under the indenture to
defer interest payments on the junior subordinated debt securities for one or
more periods, none of which may exceed five years. During a deferral period, no
interest will be due and payable. A deferral of interest payments cannot extend,
however, beyond the maturity of the junior subordinated debt securities. As a

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consequence of any such deferral, distributions on the preferred securities also
would be deferred. During a deferral period, the amount of distributions due to
you would continue to accumulate and the deferred distributions will themselves
accrue additional distributions at the same rate. When this prospectus refers to
any payment of distributions, distributions include any additional distributions
unless otherwise stated.

    Upon the termination of any deferral period and the payment of all amounts
then due, OGE Energy may commence a new deferral period, subject to the maturity
limitation and the five-year limit discussed above. Consequently, there could be
several deferral periods of varying lengths throughout the term of the junior
subordinated debt securities. The regular trustees will give the holders of the
preferred securities notice of any deferral period upon their receipt of notice
from OGE Energy. If distributions are deferred, the deferred distributions will
be paid to holders of record of the preferred securities as they appear on the
securities register of the trust on the record date following the termination of
the deferral period. See "Description of the Junior Subordinated Debt
Securities-- Interest" and "--Option to Defer Interest Payments."

    PAYMENT OF DISTRIBUTIONS.  Distributions on the preferred securities will be
payable to the holders named on the securities register of the trust at the
close of business on the relevant record dates. As long as the preferred
securities remain in book-entry only form, the record dates will be one business
day before the distribution dates. Distributions will be paid through the
property trustee who will hold amounts received on the junior subordinated debt
securities in a property account for the benefit of the holders of the
securities. Unless any applicable laws and regulations and the provisions of the
declaration state otherwise, each payment will be made as described under
"--Book-Entry Only Issuance--The Depository Trust Company" below.

    If the preferred securities do not continue to remain in book-entry only
form, the relevant record dates will conform to the rules of any securities
exchange on which the preferred securities are listed. If any date on which
distributions are to be made on the preferred securities is not a business day,
then payment of the distributions payable on that date will be made on the next
day that is a business day, and without any interest or other payment resulting
from the delay. However, if the next business day is in the next calendar year,
the payment will be made on the immediately preceding business day. A "business
day" means any day other than Saturday, Sunday or any other day on which banking
institutions in The City of New York are permitted or required by law to close.

REDEMPTION

    The preferred securities will be redeemed upon the maturity of the junior
subordinated debt securities or to the extent the junior subordinated debt
securities are redeemed. The junior subordinated debt securities will mature on
the date specified in the applicable prospectus supplement, and may be redeemed,
in whole or in part, at any time on or after the date specified in the
applicable prospectus supplement. The junior subordinated debt securities can
also be redeemed at any time, in whole but not in part, upon the occurrence of a
tax event or an investment company event as described below.

    Upon the maturity of the junior subordinated debt securities, the proceeds
of their repayment will simultaneously be applied to redeem all outstanding
trust securities at the redemption price. Upon the redemption of the junior
subordinated debt securities, whether in whole or in part, either at the option
of OGE Energy or pursuant to a tax or investment company event, the trust will
use the cash it receives upon the redemption to redeem trust securities having
an aggregate liquidation amount equal to the aggregate principal amount of the
junior subordinated debt securities so redeemed at the redemption price. Before
a redemption, holders of preferred securities will be given not less than 30
days' notice.

                                       7
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SPECIAL EVENT REDEMPTION

    "Tax event" means that the regular trustees will have received an opinion of
an independent tax counsel experienced in applicable matters which states that,
as a result of any:

    - amendment to, or change in, or announced proposed change in, the laws or
      associated regulations of the United States or any political subdivision
      or taxing authority of the United States, which is announced and effective
      on or after the date of the original issuance of the preferred securities;
      or

    - official administrative pronouncement, action or judicial decision
      interpreting or applying those laws or regulations, which is made after
      the date of the original issuance of the preferred securities;

there is more than an insubstantial risk currently or within the 90 days
following such opinion that:

    - the trust would be required to pay United States federal income tax
      relating to income accrued or received on the junior subordinated debt
      securities;

    - interest payable to the trust on the junior subordinated debt securities
      would not be deductible by OGE Energy in whole or in part for United
      States federal income tax purposes; or

    - the trust would be required to pay more than a minimal amount of other
      taxes, duties or other governmental charges.

    "Investment company event" means that the regular trustees will have
received an opinion of a nationally recognized independent counsel which states
that, as a result of the occurrence of a change in law or regulation or a
written change in interpretation or application of law or regulation by any
legislative body, court, governmental agency or regulatory authority, which is
announced on or after the date of the original issuance of the preferred
securities, there is more than an insubstantial risk that the trust is or will
be considered an "investment company" that is required to be registered under
the Investment Company Act of 1940.

    This prospectus refers to a tax event or an investment company event as a
"special event." If a special event occurs and continues, OGE Energy may, upon
not less than 30 days' notice, redeem the junior subordinated debt securities,
in whole but not in part, for cash within 90 days following the occurrence of
that special event.

REDEMPTION PROCEDURES

    The trust may not redeem fewer than all of the outstanding preferred
securities unless all accrued and unpaid distributions on all preferred
securities have been paid.

    Once notice of redemption is given and funds are irrevocably deposited,
distributions will cease to accrue and all rights of holders of preferred
securities called for redemption will cease, except the right of the holders to
receive the redemption price but without interest on the redemption price. If
any redemption date is not a business day, then payment of the redemption price
payable on that date will be made on the succeeding day that is a business day,
without any interest or other payment resulting from the delay. However, if the
next business day falls in the next calendar year, payment will be made on the
preceding business day.

    If payment of the redemption price for any preferred securities is
improperly withheld or refused and not paid either by the trust or by OGE Energy
under the guarantee, distributions on those preferred securities will continue
to accrue at the then-applicable rate from the original redemption date to the
date of payment. In this case, the actual payment date will be the redemption
date for purposes of calculating the redemption price. See "--Book-Entry Only
Issuance--The Depository Trust Company."

                                       8
<PAGE>
    In the event that fewer than all of the outstanding preferred securities are
to be redeemed, the particular preferred securities to be redeemed will be
selected by the property trustee on a basis that it deems to be fair and
appropriate, including by lot.

    OGE Energy or its subsidiaries may, at any time, and from time to time,
purchase outstanding preferred securities by tender, in the open market or by
private agreement, provided that it complies with United States federal
securities laws and any other applicable laws.

DISTRIBUTION OF THE JUNIOR SUBORDINATED DEBT SECURITIES

    OGE Energy will have the right at any time to dissolve the trust. After
satisfying the liabilities of its creditors, the trust may distribute junior
subordinated debt securities in exchange for the preferred securities.

    There can be no assurance as to the market prices for either the preferred
securities or the junior subordinated debt securities that may be distributed in
exchange for the preferred securities if a dissolution and liquidation of the
trust were to occur. This means that the preferred securities that an investor
may purchase, whether pursuant to the offer made by this prospectus and the
relevant prospectus supplement or in the secondary market, or the junior
subordinated debt securities that an investor may receive if a dissolution and
liquidation of the trust were to occur, may trade at a discount to the price
that the investor paid to purchase the preferred securities offered by this
prospectus.

TRUST ENFORCEMENT EVENTS

    Upon the occurrence of an indenture event of default (described below), the
indenture trustee or the property trustee, as the sole holder of the junior
subordinated debt securities, will have the right under the indenture to declare
the principal of and interest on the junior subordinated debt securities to be
immediately due and payable.

    If the property trustee fails to enforce its rights as holder of the junior
subordinated debt securities, any holder of preferred securities may directly
institute a legal proceeding against OGE Energy to enforce these rights without
first suing the property trustee or any other person or entity. If a trust
enforcement event (as described below) has occurred and is continuing and that
event is attributable to the failure of OGE Energy to pay interest or principal
on the junior subordinated debt securities on the date the interest or principal
is otherwise payable, then a holder of preferred securities may also bring a
direct action.

    An "indenture event of default" is an event of default under the indenture
and also constitutes a "trust enforcement event," which is an event of default
under the declaration relating to the trust securities. Pursuant to the
declaration, however, the holder of the common securities will be deemed to have
waived any trust enforcement event relating to the common securities until all
trust enforcement events relating to the preferred securities have been cured,
waived or otherwise eliminated. Until such trust enforcement events relating to
the preferred securities have been so cured, waived, or otherwise eliminated,
the property trustee will be deemed to be acting solely on behalf of the holders
of the preferred securities and only the holders of the preferred securities
will have the right to direct the property trustee as to matters under the
declaration, and therefore the indenture.

VOTING RIGHTS; CONTROL OF REMEDIES

    Except as described in this prospectus under this heading, "--Modification
of the Declaration" and "Description of the Guarantee--Modification of
Guarantee; Assignment," and except as required by law, the holders of the
preferred securities will have no voting rights.

                                       9
<PAGE>
    The holders of a majority in aggregate liquidation amount of the preferred
securities have the right to direct any proceeding for any remedy available to
the property trustee, including to:

    - exercise the remedies available to it under the indenture;

    - waive any past indenture event of default and its consequences that is
      waivable under the indenture; or

    - consent to any amendment, modification or termination of the indenture
      where that consent is required.

    Any required approval or direction of holders of preferred securities may be
given at a separate meeting of holders of preferred securities convened for that
purpose, at a meeting of all of the holders of trust securities or by written
consent.

    If an indenture event of default has occurred and not been cured, the
holders of 25% of the aggregate liquidation amount of the preferred securities
may direct the property trustee to declare the principal and interest on the
junior subordinated debt securities due and payable. However, where a consent or
action under the indenture would require the consent of more than a majority of
the aggregate principal amount of debt securities affected thereby, consent from
the holders of that greater percentage would be required. See "Description of
the Junior Subordinated Debt Securities-- Modifications and Amendments."

    Despite the fact that holders of preferred securities are entitled to vote
or consent in the circumstances described above, any of the preferred securities
that are owned at the time by OGE Energy or any entity directly or indirectly
controlling or controlled by, or under direct or indirect common control with,
OGE Energy, will not be entitled to vote or consent. Instead, those preferred
securities will be treated as if they were not outstanding.

    The procedures by which holders of preferred securities may exercise their
voting rights are described below. See "--Book-Entry Only Issuance--The
Depository Trust Company."

    Holders of the preferred securities generally will have no rights to appoint
or remove the regular trustees. Instead, the trustees may be appointed, removed
or replaced solely by OGE Energy as the indirect or direct holder of all of the
common securities.

MODIFICATION OF THE DECLARATION

    The declaration may be amended from time to time without the consent of the
holders of the preferred securities:

    - to cure any ambiguity or correct or supplement any provisions that may be
      defective or inconsistent with any other provision;

    - to add to the covenants, restrictions or obligations of OGE Energy in its
      capacity as sponsor of the trust;

    - to conform to any change in Rule 3a-5 under the Investment Company Act of
      1940 or written change in interpretation or application of that rule by
      any legislative body, court, government agency or regulatory authority; or

    - to modify, eliminate or add to any provisions as necessary to ensure that
      the trust will be classified for United States federal income tax purposes
      as a grantor trust at all times or to ensure that the trust will not be
      required to register as an investment company under the Investment Company
      Act of 1940.

    Amendments made without the consent of the preferred securities cannot
adversely affect in any material respect the rights of the holders of preferred
or common securities.

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    The declaration of trust may also be amended as to other matters with the
consent of holders of a majority of the outstanding preferred securities.
However, without the consent of each affected holder of preferred or common
securities, the declaration of trust may not be amended to:

    - change the amount or timing of any distribution or otherwise adversely
      affect the amount of any distribution required to be made; or

    - restrict the right of a holder to institute suit for the enforcement of
      any distribution.

    Despite the foregoing, no amendment or modification may be made to the
declaration if the amendment or modification would

    - cause the trust to be classified for United States federal income tax
      purposes as other than a grantor trust,

    - reduce or otherwise adversely affect the powers of the property trustee in
      contravention of the Trust Indenture Act; or

    - cause the trust to be deemed an investment company which is required to be
      registered under the Investment Company Act of 1940.

BOOK-ENTRY ONLY ISSUANCE--THE DEPOSITORY TRUST COMPANY

    The preferred securities will be book-entry securities. Upon issuance, all
book-entry securities will be represented by one or more fully registered global
securities. Each global security will be deposited with, or on behalf of, The
Depository Trust Company, a securities depository, and will be registered in the
name of DTC or a nominee of DTC. DTC will thus be the only registered holder of
these securities.

    Purchasers of securities may only hold interests in the global notes through
DTC if they are participants in the DTC system. Purchasers may also hold
interests through a securities intermediary-- banks, brokerage houses and other
institutions that maintain securities accounts for customers--that has an
account with DTC or its nominee. DTC will maintain accounts showing the security
holdings of its participants, and these participants will in turn maintain
accounts showing the security holdings of their customers. Some of these
customers may themselves be securities intermediaries holding securities for
their customers. Thus, each beneficial owner of a book-entry security will hold
that security indirectly through a hierarchy of intermediaries, with DTC at the
"top" and the beneficial owner's own securities intermediary at the "bottom."

    The securities of each beneficial owner of a book-entry security will be
evidenced solely by entries on the books of the beneficial owner's securities
intermediary. The actual purchaser of the securities will generally not be
entitled to have the securities represented by the global securities registered
in its name and will not be considered the owner under the declaration. In most
cases, a beneficial owner will also not be able to obtain a paper certificate
evidencing the holder's ownership of securities. The book-entry system for
holding securities eliminates the need for physical movement of certificates and
is the system through which most publicly traded common stock is held in the
United States. However, the laws of some jurisdictions require some purchasers
of securities to take physical delivery of their securities in definitive form.
These laws may impair the ability to transfer book-entry securities.

    A beneficial owner of book-entry securities represented by a global security
may exchange the securities for definitive (paper) securities only if:

    - DTC is unwilling or unable to continue as depositary for such global
      security and OGE Energy does not appoint a qualified replacement for DTC
      within 90 days; or

    - OGE Energy in its sole discretion decides to allow some or all book-entry
      securities to be exchangeable for definitive securities in registered
      form.

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<PAGE>
    Unless we indicate otherwise, any global security that is exchangeable will
be exchangeable in whole for definitive securities in registered form, with the
same terms and of an equal aggregate principal amount. Definitive securities
will be registered in the name or names of the person or persons specified by
DTC in a written instruction to the registrar of the securities. DTC may base
its written instruction upon directions that it receives from its participants.

    In this prospectus, for book-entry securities, references to actions taken
by security holders will mean actions taken by DTC upon instructions from its
participants, and references to payments and notices of redemption to security
holders will mean payments and notices of redemption to DTC as the registered
holder of the securities for distribution to participants in accordance with
DTC's procedures.

    DTC is a limited purpose trust company organized under the laws of the State
of New York, 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 under section 17A of the Securities Exchange Act of 1934. The
rules applicable to DTC and its participants are on file with the SEC.

    DTC's management is aware that some computer applications, systems, and the
like for processing dates that are dependent upon calendar dates, including
dates before, on, and after January 1, 2000, may encounter "Year 2000 problems."
DTC has informed its participants and other members of the financial community
that it has developed and is implementing a program so that its systems, as they
relate to the timely payment of distributions to securityholders, book-entry
deliveries, and settlement of trades within DTC, continue to function
appropriately. This program includes a technical assessment and a remediation
plan, each of which is complete. Additionally, DTC's plan includes a testing
phase, which is expected to be completed within appropriate time frames.

    OGE Energy and the trustees will not have any responsibility or liability
for any aspect of the records relating to, or payments made on account of,
beneficial ownership interest in the book-entry securities or for maintaining,
supervising or reviewing any records relating to the beneficial ownership
interests.

    DTC may discontinue providing its services as securities depositary at any
time by giving reasonable notice. Under those circumstances, in the event that a
successor securities depositary is not obtained, securities certificates are
required to be printed and delivered. Additionally, OGE Energy may decide to
discontinue use of the system of book-entry transfers through DTC or any
successor depositary with respect to the preferred securities. In that event,
certificates for the securities will be printed and delivered.

    The information in this section concerning DTC and DTC's book-entry system
has been obtained from sources that OGE Energy believes to be reliable, but OGE
Energy does not take responsibility for the accuracy thereof.

INFORMATION CONCERNING THE PROPERTY TRUSTEE

    Prior to the occurrence of a default relating to the trust securities and
after the cure of all trust enforcement events, the property trustee undertakes
to perform only those duties as are specifically set forth in the declaration.
After a default relating to the trust securities, the property trustee will
exercise the same degree of care as a prudent individual would exercise in the
conduct of his or her own affairs. The property trustee is under no obligation
to exercise any of the powers vested in it by the declaration at the request of
any holder of preferred securities unless offered reasonable indemnity by that
holder against the costs, expenses and liabilities which might be incurred
thereby.

PAYING AGENT

    If the preferred securities do not remain in book-entry only form, the
following provisions will apply:

    - the property trustee may select a paying agent or may act as paying agent;
      and

    - registration of transfers of preferred securities will be effected without
      charge (other than in respect of any tax or other government charge).

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             DESCRIPTION OF THE JUNIOR SUBORDINATED DEBT SECURITIES

    The junior subordinated debt securities in which the trust will invest the
proceeds from the issuance and sale of the trust securities will be issued
pursuant to the indenture between OGE Energy and Bank of Oklahoma, National
Association, as the indenture trustee. The indenture will be qualified under the
Trust Indenture Act of 1939. The terms of the junior subordinated debt
securities will include those stated in the indenture and those made a part of
the indenture by the Trust Indenture Act. The following summary of the material
terms of the junior subordinated debt securities is not intended to be complete
and is qualified by the applicable prospectus supplement, the indenture, the
Trust Indenture Act and other applicable law. The indenture, including all
amendments, has been filed with the SEC as an exhibit to, and is incorporated by
reference in, the registration statement of which this prospectus forms a part.

GENERAL

    The junior subordinated debt securities will be issued as unsecured debt
under the indenture. The junior subordinated debt securities will be limited in
aggregate principal amount to the sum of the aggregate stated liquidation amount
of the preferred securities and the capital contributed by OGE Energy to the
trust in exchange for the common securities.

    The entire principal amount of the junior subordinated debt securities will
mature and become due and payable, together with any accrued and unpaid interest
thereon, on the date specified in the applicable prospectus supplement.

    If junior subordinated debt securities are distributed to holders of
preferred securities in liquidation of that holders' interests in the trust,
those junior subordinated debt securities will initially be issued in the form
of one or more global securities under depositary arrangements similar to those
in effect for the preferred securities. See "Description of the Preferred
Securities--Book-Entry Only Issuance--The Depository Trust Company." In the
event junior subordinated debt securities are issued in certificated form,
principal and interest will be payable, the transfer of the junior subordinated
debt securities will be registrable and junior subordinated debt securities will
be exchangeable for securities of other denominations of a like aggregate
principal amount at the corporate trust office of the indenture trustee in
Oklahoma City, Oklahoma.

SUBORDINATION

    The indenture provides that the junior subordinated debt securities are
subordinated and junior in right of payment to all senior debt, as defined
below, of OGE Energy. No payment of principal of, or premium, if any, or
interest on the junior subordinated debt securities may be made if (1) a default
has occurred and is continuing in the payment of principal of or premium, if
any, or interest on any senior debt of OGE Energy, or (2) if any event of
default with respect to senior debt of OGE Energy has occurred and is continuing
and has resulted in senior debt becoming or being declared due and payable,
unless and until the event of default shall have been cured or waived or shall
have ceased to exist and acceleration shall have been rescinded or annulled, or
(3) any judicial proceeding is pending with respect to any default in payment or
event of default. In case of the pendency of any receivership, insolvency,
liquidation, bankruptcy, reorganization or other judicial proceeding relative to
OGE Energy, the holders of senior debt of OGE Energy will be entitled to receive
payment in full of all amounts due or to become due on or in respect of all
senior debt before the holders of the junior subordinated debt securities are
entitled to receive or retain any payment or distribution. Subject to the prior
payment of all senior debt, the rights of holders of the junior subordinated
debt securities will be subrogated to the rights of the holders of senior debt
to receive payments and distributions applicable to the senior debt until all
amounts owing on the junior subordinated debt securities are paid in full. OGE
Energy had $791.6 million of senior debt outstanding at August 31, 1999.

                                       13
<PAGE>
    "Senior debt" means:

    (1) the principal, premium, if any, and interest in respect of (A)
       indebtedness of OGE Energy for money borrowed and (B) indebtedness
       evidenced by securities, notes, debentures, bonds or other similar
       instruments issued by OGE Energy;

    (2) all capitalized lease obligations of OGE Energy;

    (3) all obligations of OGE Energy representing the deferred purchase price
       of property, including conditional sales obligations and obligations
       under title retention agreements;

    (4) all obligations for the reimbursement of the issuer of specified types
       of letters of credit;

    (5) all obligations of the type referred to in clauses (1) through (4) of
       other persons for which OGE Energy is responsible or liable as guarantor
       or otherwise; and

    (6) all obligations of the type referred to in clauses (1) through (5) of
       other persons secured by any lien on any property or asset of OGE Energy,
       whether or not the obligation is assumed by OGE Energy, with the amount
       of the obligation being deemed to equal the lessor of the value of the
       property or assets or the amount of the obligation secured by the
       property or assets of OGE Energy.

but senior debt does not include:

       (a) junior subordinated debt securities;

       (b) any indebtedness that by its terms is subordinated to, or ranks on an
           equal basis with, subordinated debt securities; and

       (c) indebtedness for goods or materials purchased in the ordinary course
           of business or for services obtained in the ordinary course of
           business or indebtedness consisting of trade payables.

    The debt of OGE Energy's subsidiaries is effectively senior to the junior
subordinated debt securities. At August 31, 1999, approximately $2.108 billion
of obligations of OGE Energy's subsidiaries not included in OGE Energy's senior
indebtedness was outstanding.

    The indenture does not limit the aggregate amount of senior debt that may be
issued by OGE Energy.

REDEMPTION

    OGE Energy will have the right to redeem the junior subordinated debt
securities as described above under "Description of the Preferred
Securities--Special Event Redemption." The redemption price will be equal to
100% of the principal amount to be redeemed plus any accrued and unpaid interest
to the date of redemption. OGE Energy will also have the right, at any time on
or after the date specified in the applicable prospectus supplement, to redeem
the junior subordinated debt securities in whole or in part at a redemption
price specified in the applicable prospectus supplement.

INTEREST

    The junior subordinated debt securities will bear interest at the rate
specified in the applicable prospectus supplement, payable in arrears on the
dates specified in the applicable prospectus supplement, unless interest is
deferred as described below. Interest will be paid to the person in whose name a
junior subordinated debt security is registered, with limited exceptions, at the
close of business on the business day next preceding that interest payment date.
In the event the junior subordinated debt securities no longer remain in
book-entry only form, OGE Energy will select appropriate record dates.

                                       14
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    The amount of interest payable for any period will be computed on the basis
of a 360-day year of twelve 30-day months. The amount of interest payable for
any period shorter than a full quarterly period will be computed on the basis of
a 30-day month and, for periods of less than a full month, the actual number of
days elapsed per 30-day month. If any date on which interest is payable on the
junior subordinated debt securities is not a business day, then payment of the
interest payable on that date will be made on the succeeding day that is a
business day, and without any interest or other payment in respect of any such
delay. However, if the next business day is in the succeeding calendar year,
then payment shall be made on the preceding business day, in each case with the
same force and effect as if made on the stated date.

OPTION TO DEFER INTEREST PAYMENTS

    OGE Energy can defer interest payments for one or more periods of up to five
years. However, no deferral period may extend beyond the maturity of the junior
subordinated debt securities. At the end of the deferral period, OGE Energy will
pay all interest then accrued and unpaid.

    During any deferral period, OGE Energy will not be permitted to:

    - declare or pay a dividend or make any other payment or distribution on OGE
      Energy's capital stock;

    - redeem, purchase, acquire or make a liquidation payment on any of OGE
      Energy's capital stock;

    - make an interest, principal or premium payment, or repay, repurchase or
      redeem, any debt issued by OGE Energy that ranks equally with or junior to
      the junior subordinated debt securities; or

    - make any guarantee payment with respect to any guarantee by OGE Energy of
      debt securities of any of its subsidiaries or any other person, if the
      guarantee ranks equal to or junior to the junior subordinated debt
      securities.

    During any deferral period, however, OGE Energy will be permitted to:

    - declare and pay dividends or distributions by way of issuance of its
      common stock;

    - make payments under the guarantee in respect of the preferred and common
      securities;

    - declare or pay a dividend in connection with the implementation of a
      shareholders' rights plan, or the issuing of stock under such a plan or
      repurchase such rights; and

    - purchase common stock relating to the issuing of common stock or rights
      under any of OGE Energy's benefit plans.

    OGE Energy has no present intention of exercising its right to defer
payments of interest by extending the interest payment period on the junior
subordinated debt securities.

    If the property trustee is the sole holder of the junior subordinated debt
securities, OGE Energy will give the regular trustees, the property trustee and
the indenture trustee notice of its election to defer interest payments one
business day prior to the earlier of:

    - the date distributions on the preferred securities would be payable, if
      not for the deferral period, or

                                       15
<PAGE>
    - the date the regular trustees are required to give notice to the NYSE or
      other applicable self-regulatory organization or to holders of the
      preferred securities of the record date or the date such distribution
      would be payable, if not for the deferral period,

but in any event one business day prior to the record date. The regular trustees
will give notice of OGE Energy's selection of a deferral period to the holders
of the preferred securities.

    If the property trustee is not the sole holder of the junior subordinated
debt securities, OGE Energy shall give the holders of the junior subordinated
debt securities notice of its election to defer interest payments ten business
days prior to the earlier of

    - the next succeeding interest payment date or

    - the date upon which OGE Energy is required to give notice to the NYSE or
      other applicable self-regulatory organization or to holders of the junior
      subordinated debt securities of the record or payment date of the related
      interest payment,

but in any event two business days prior to the record date.

INDENTURE EVENTS OF DEFAULT

    The indenture provides that the following are events of default relating to
the junior subordinated debt securities of a particular series:

    - failure to pay required interest on any debt security of that series for
      30 days;

    - failure to pay principal or premium, if any, on any debt security of that
      series when due;

    - failure to pay at final maturity, or acceleration of, indebtedness of OGE
      Energy having an aggregate principal amount of more than 1% of OGE
      Energy's consolidated total assets (determined as of the most recent
      fiscal year-end), unless cured within 10 days after notice has been given
      to OGE Energy by the trustee or the holders of at least 10% in aggregate
      principal amount of the junior subordinated debt securities of that
      series;

    - failure to perform for 60 days after notice from the indenture trustee or
      the holders of at least 25% in aggregate principal amount of debt
      securities of a particular series to OGE Energy of a default under any
      other covenant in the relevant indenture other than a covenant included in
      the relevant indenture solely for the benefit of a series of debt
      securities other than that series; and

    - specified events of bankruptcy or insolvency, whether voluntary or not.

    If any indenture event of default occurs and is continuing, the indenture
trustee or property trustee, as the holder of the junior subordinated debt
securities, will have the right to declare the principal of and the interest on
the junior subordinated debt securities and any other amounts payable under the
indenture to be immediately due and payable. An indenture event of default also
constitutes a trust enforcement event. The holders of preferred securities in
limited circumstances have the right to direct the property trustee to exercise
its rights as the holder of the junior subordinated debt securities. See
"Description of the Preferred Securities--Trust Enforcement Events" and
"--Voting Rights; Control of Remedies."

    Despite the foregoing, if a trust enforcement event has occurred and is
continuing and the event is attributable to the failure of OGE Energy to pay
interest or principal on the junior subordinated debt securities when such
interest or principal is payable, OGE Energy acknowledges that a holder of
preferred securities may sue for payment. OGE Energy may not amend the indenture
to remove this right to bring a direct action without the prior written consent
of all of the holders of preferred securities.

                                       16
<PAGE>
CONSOLIDATION, MERGER, CONVEYANCE, TRANSFER OR LEASE

    OGE Energy may not consolidate with or merge into any other person or
convey, transfer or lease its properties and assets substantially as an entirety
to any person, unless

    - the corporation or entity formed by such consolidation or into which OGE
      Energy is merged or which acquires by conveyance or transfer, or which
      leases, the properties and assets of OGE Energy substantially as an
      entirety, is a corporation, partnership or trust that expressly assumes,
      by supplemental indenture executed and delivered to the indenture trustee,
      the payment of the principal of and premium, if any, and interest on all
      the junior subordinated debt securities and the performance of every
      covenant of the subordinated indenture on the part of OGE Energy to be
      performed or observed;

    - immediately after giving effect to the transaction, no event of default
      under the subordinated indenture, and no event that, after notice or lapse
      of time or both, would become an event of default under the subordinated
      indenture, shall have happened and be continuing; and

    - OGE Energy has delivered to the indenture trustee an officers' certificate
      and an opinion of counsel, each stating that the transaction complies with
      the provisions of the subordinated indenture governing consolidation,
      merger, conveyance, transfer or lease and that all conditions precedent
      thereto have been complied with.

    For purposes of the foregoing summarized provisions of the indenture, the
phrase "ALL OR SUBSTANTIALLY ALL OF ITS PROPERTIES AND ASSETS" means 50% or more
of the total assets of OGE Energy as shown on the consolidated balance sheet of
OGE Energy as of the end of the calendar year immediately preceding the day of
the year in which such determination is made. Nothing in the indenture prevents
or hinders OGE Energy from selling, transferring or otherwise disposing during
any calendar year (in one transaction or a series of transactions) less than 50%
of the amount of its total assets as shown on the consolidated balance sheet of
OGE Energy as of the end of the immediately preceding calendar year.

SATISFACTION AND DISCHARGE

    The indenture will cease to be of further effect and OGE Energy will be
deemed to have satisfied and discharged all of its obligations under the
indenture when (1) all outstanding junior subordinated debt securities have
become due and payable, or will become due and payable within one year, by
reason of the maturity or a redemption date, and (2) OGE Energy deposits with
the indenture trustee, in trust, funds that are sufficient to pay and discharge
all remaining indebtedness on the outstanding junior subordinated debt
securities; provided however, that OGE Energy will remain obligated to pay all
other amounts due under the debt securities indenture and to perform certain
ministerial tasks as described in the indenture.

    Unless otherwise provided in a supplemental indenture setting forth the
terms of a series of junior subordinated debt securities, OGE Energy will be
deemed to have paid and discharged the entire indebtedness on all of the
outstanding junior subordinated debt securities of that series when (1) OGE
Energy deposits with the indenture trustee, in trust, funds that are sufficient
to pay and discharge all remaining indebtedness on the outstanding junior
subordinated debt securities of that series to the stated maturity or any
redemption date, (2) OGE Energy has paid all other sums payable with respect to
the outstanding junior subordinated debt securities of that series, and (3) OGE
Energy has satisfied certain other requirements intended to ensure that the
payment and discharge will not have any adverse United States federal income tax
consequences to holders of the applicable junior subordinated debt securities or
holders of the preferred securities. If, in limited circumstances, OGE Energy is
deemed to have paid and discharged the entire indebtedness on all of the
outstanding junior subordinated debt securities of a series, the holders of
junior subordinated debt securities of that series

                                       17
<PAGE>
will not be entitled to the benefits of the indenture, except for specified
covenants, including the covenant to pay any amounts due on junior subordinated
debt securities of that series.

MODIFICATIONS AND AMENDMENTS

    The indenture may be modified by OGE Energy and the trustee without the
consent of any holders with respect to certain matters, including without
limitation (i) to cure any ambiguity, defect or inconsistency or to correct or
supplement any provision which may be inconsistent with any provision of the
indenture and (ii) to make any change that does not materially adversely affect
the interests of any holder of junior subordinated debt securities of any
series. In addition, under the indenture, certain rights and obligations of OGE
Energy and the rights of holders of the junior subordinated debt securities may
be modified by OGE Energy and the trustee with the written consent of the
holders of a majority in aggregate principal amount of the outstanding junior
subordinated debt securities of each series affected thereby; but no change in
the maturity of any junior subordinated debt securities of any series, reduction
in the interest rate or extension of the time for payment of interest, change in
the redemption provisions in a manner adverse to any holder of junior
subordinated debt securities of any series, other modification in the terms of
payment of the principal of, or interest on, any junior subordinated debt
securities of any series, or reduction of the percentage required for
modification, will be effective against any holder of any outstanding junior
subordinated debt security of any series affected thereby without the holder's
consent. The indenture does not limit the aggregate amount of junior
subordinated debt securities of OGE Energy which may be issued thereunder.

    The holders of a majority in aggregate principal amount of the outstanding
junior subordinated debt securities of any series may on behalf of the holders
of all junior subordinated debt securities of that series waive, insofar as that
series is concerned, compliance by OGE Energy with certain restrictive covenants
of the indenture. The holders of a majority in aggregate principal amount of the
outstanding junior subordinated debt securities of any series may on behalf of
the holders of all junior subordinated debt securities of that series waive any
past event of default or default under the indenture with respect to that
series, except an event of default or a default in the payment of the principal
of, or premium, if any, or any interest on any junior subordinated debt security
of that series or in respect of a provision which under the indenture cannot be
modified or amended without the consent of the holder of each outstanding junior
subordinated debt security of that series affected.

CONCERNING THE INDENTURE TRUSTEE

    OGE Energy and certain of its subsidiaries maintain bank accounts, borrow
money and have other customary commercial banking or investment banking
relationships with the indenture trustee in the ordinary course of business.

MISCELLANEOUS

    The indenture provides that OGE Energy will pay all fees and expenses
related to:

    - the issuance and exchange of the trust securities and the junior
      subordinated debt securities;

    - the organization, maintenance and dissolution of the trust;

    - the retention of the trustees; and

    - the enforcement by the property trustee of the rights of the holders of
      the preferred securities.

    The indenture is governed and construed in accordance with the laws of
Oklahoma.

                                       18
<PAGE>
                          DESCRIPTION OF THE GUARANTEE

    The guarantee to be executed and delivered by OGE Energy for the benefit of
the holders of preferred securities will be qualified as an indenture under the
Trust Indenture Act of 1939. Wilmington Trust Company will act as guarantee
trustee for purposes of the Trust Indenture Act. The terms of the guarantee will
include those set forth in the guarantee and those made part of the guarantee by
the Trust Indenture Act. The following summary of the material terms of the
guarantee is not intended to be complete and is qualified in all respects by the
applicable prospectus supplement, the guarantee, the Trust Indenture Act and
other applicable law. The guarantee will be filed as an exhibit to a document
incorporated by reference in the registration statement of which this prospectus
forms a part.

GENERAL

    Pursuant to and to the extent set forth in the guarantee, OGE Energy will
irrevocably and unconditionally agree to pay in full to the holders of the
preferred securities, as and when due, regardless of any defense, right of
set-off or counterclaim which the trust may have or assert, the following
payments without duplication:

    - any accrued and unpaid distributions that are required to be paid on the
      preferred securities, to the extent the trust has sufficient funds
      available for those distributions;

    - the redemption price per preferred security, to the extent the trust has
      funds available for those redemptions; and

    - upon a voluntary or involuntary dissolution, winding-up or liquidation of
      the trust, other than in connection with the distribution of junior
      subordinated debt securities to the holders of preferred securities, the
      lesser of (1) the aggregate liquidation amount of the preferred securities
      and all accrued and unpaid distributions thereon and (2) the amount of
      assets of the trust remaining for distribution to holders of the preferred
      securities upon a liquidation of the trust.

STATUS OF THE GUARANTEE

    The guarantee will constitute an unsecured obligation of OGE Energy and will
rank:

    - subordinate and junior in right of payment to all other liabilities of OGE
      Energy, except those that rank equally or subordinate by their terms,

    - on a parity with the most senior preferred or preference stock now or
      hereafter issued by OGE Energy and with any guarantee now or hereafter
      entered into by OGE Energy in respect of any preferred securities of any
      affiliate of OGE Energy, and

    - senior to OGE Energy's common stock.

    The guarantee will not place a limitation on the amount of additional senior
debt that may be incurred by OGE Energy.

    The guarantee will constitute a guarantee of payment and not of collection
(that is, the guaranteed party may institute a legal proceeding directly against
OGE Energy to enforce its rights under the guarantee without first instituting a
legal proceeding against any other person or entity). The guarantee will not be
discharged except by payment of the guarantee payments in full to the extent not
paid by the trust or upon distribution of the junior subordinated debt
securities to the holders of the preferred securities in exchange for all such
preferred securities.

    The guarantee, when taken together with OGE Energy's obligations under the
junior subordinated debt securities, the indenture and the declaration,
including its obligations to pay costs, expenses, debts and liabilities of the
trust, other than those relating to trust securities, will provide a full and

                                       19
<PAGE>
unconditional guarantee on a subordinated basis by OGE Energy of payments due on
the preferred securities. See "Effect of Obligations Under the Junior
Subordinated Debt Securities and the Guarantee."

IMPORTANT COVENANTS OF OGE ENERGY

    In the guarantee, OGE Energy will covenant that, so long as any trust
securities remain outstanding, if:

    - there shall have occurred any event of default under the indenture or OGE
      Energy shall be in default with respect to its payment of any obligations
      under the guarantee, or

    - OGE Energy shall have given notice of its election to defer interest
      payments and shall not have rescinded such notice, and while such interest
      is deferred,

then OGE Energy will not, and will not permit any subsidiary to:

    - declare or pay any dividends or distributions on, or redeem, purchase,
      acquire or make a liquidation payment with respect to, any of OGE Energy's
      capital stock, or

    - make any payment of principal, interest or premium, if any, on or repay,
      repurchase or redeem any debt securities of OGE Energy that rank on a
      parity with or junior in interest to the junior subordinated debt
      securities or make any guarantee payments with respect to any guarantee by
      OGE Energy of the debt securities of any subsidiary of OGE Energy if such
      guarantee ranks on a parity with or junior in interest to such junior
      subordinated debt securities, other than:

       - dividends or distributions in common stock of OGE Energy,

       - payments under the guarantee made by OGE Energy in respect of the trust
         securities of the trust,

       - any declaration of a dividend in connection with the implementation of
         a shareholders' rights plan, or the issuance of stock under any such
         plan in the future, or the redemption or repurchase of any such rights
         pursuant thereto, and

       - purchases of common stock related to the issuance of common stock or
         rights under any of OGE Energy's benefit plans.

EVENTS OF DEFAULT

    An event of default under the guarantee will occur upon the failure of OGE
Energy to perform any of its payment or other obligations required by the
guarantee. The holders of a majority in aggregate liquidation amount of the
preferred securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the guarantee trustee in
respect of the guarantee or to direct the exercise of any trust or power
conferred upon the guarantee trustee under the guarantee.

    If the guarantee trustee fails to enforce the guarantee trustee's rights
under the guarantee, any holder of related preferred securities may directly sue
OGE Energy to enforce the guarantee trustee's rights under the guarantee without
first suing the trust, the guarantee trustee or any other person or entity.

    OGE Energy, as guarantor, will be required to file annually with the
guarantee trustee a certificate as to whether or not OGE Energy is in compliance
with all the conditions and covenants applicable to it under the guarantee.

    The holders of a majority in liquidation amount of the preferred securities
may vote to waive, on behalf of all holders of preferred securities, any past
event of default under the guarantee.

                                       20
<PAGE>
MODIFICATION OF GUARANTEE; ASSIGNMENT

    The guarantee may be amended only with the prior approval of the holders of
not less than 66 2/3% in aggregate liquidation amount of the outstanding
preferred securities. No vote will be required, however, for any changes that do
not materially adversely affect the rights of holders of preferred securities.
All guarantees and agreements contained in the guarantee shall bind the
successors, assignees, receivers, trustees and representatives of OGE Energy and
shall inure to the benefit of the holders of the preferred securities then
outstanding.

INFORMATION CONCERNING THE GUARANTEE TRUSTEE

    Prior to the occurrence of a default relating to the guarantee and after the
cure of all events of default, the guarantee trustee undertakes to perform only
such duties as are specifically set forth in the guarantee. After such default,
the guarantee trustee will exercise the same degree of care as a prudent
individual would exercise in the conduct of his or her own affairs. Provided
that the foregoing requirements have been met, the guarantee trustee is under no
obligation to exercise any of the powers vested in it by the guarantee at the
request of any holder of preferred securities unless it is offered reasonable
indemnity against the costs, expenses and liabilities that might be incurred
thereby.

TERMINATION OF THE GUARANTEE

    The guarantee will terminate as to the preferred securities upon full
payment of the redemption price of all preferred securities, upon distribution
of the junior subordinated debt securities to the holders of the preferred
securities or upon full payment of the amounts payable upon liquidation of the
trust. The guarantee will continue to be effective or will be reinstated, as the
case may be, if at any time any holder of preferred securities must restore
payment of any sums paid under the preferred securities or the guarantee.

GOVERNING LAW

    The guarantee will be governed by and construed in accordance with the laws
of Oklahoma.

                                       21
<PAGE>
            EFFECT OF OBLIGATIONS UNDER THE JUNIOR SUBORDINATED DEBT
                          SECURITIES AND THE GUARANTEE

    As set forth in the declaration, the sole purpose of the trust is to issue
the trust securities and to invest the proceeds from such issuance and sale in
the junior subordinated debt securities. As long as payments of interest and
other payments are made when due on the junior subordinated debt securities,
such payments will be sufficient to cover the distributions and payments due on
the trust securities. This is due to the following factors:

    - the aggregate principal amount of junior subordinated debt securities will
      be equal to the sum of the aggregate stated liquidation amount of the
      trust securities;

    - the interest rate and the interest and other payment dates on the junior
      subordinated debt securities will match the distribution rate and
      distribution and other payment dates for the preferred securities;

    - under the indenture, OGE Energy will pay, and the trust will not be
      obligated to pay, directly or indirectly, all costs, expenses and
      obligations of the trust other than those relating to the trust
      securities; and

    - the declaration further provides that the OGE Energy trustees may not
      cause or permit the trust to engage in any activity that is not consistent
      with the purposes of the trust.

    Payments of distributions, to the extent there are sufficient available
funds, and other payments due on the preferred securities, to the extent there
are legally and immediately available funds, are guaranteed by OGE Energy to the
extent described in this prospectus. If OGE Energy does not make interest
payments on the junior subordinated debt securities, the trust will not have
sufficient funds to pay distributions on the preferred securities. The guarantee
is a subordinated guarantee. The guarantee does not apply to any payment of
distributions unless and until the trust has sufficient funds for the payment of
such distributions. See "Description of the Guarantee."

    The guarantee covers the payment of distributions and other payments on the
preferred securities only if and to the extent that OGE Energy has made a
payment of interest or principal or other payments on the junior subordinated
debt securities. The guarantee, when taken together with OGE Energy's
obligations under the junior subordinated debt securities and the indenture and
its obligations under the declaration, will provide a full and unconditional
guarantee of distributions and all other amounts due on the preferred
securities.

    OGE Energy acknowledges that the guarantee trustee shall enforce the
guarantee on behalf of the holders of the preferred securities. If OGE Energy
fails to make payments under the guarantee, the guarantee allows the holders of
the preferred securities to direct the guarantee trustee to enforce its rights
thereunder. If the guarantee trustee fails to enforce the guarantee, any holder
of preferred securities may directly sue OGE Energy to enforce the guarantee
trustee's rights under the guarantee. Such holder need not first sue the trust,
the guarantee trustee, or any other person or entity. A holder of preferred
securities may also directly sue OGE Energy to enforce such holder's right to
receive payment under the guarantee. Such holder need not first (1) direct the
guarantee trustee to enforce the terms of the guarantee or (2) sue the trust or
any other person or entity.

    OGE Energy will be required to pay all costs and expenses of each OGE Energy
Capital Trust pursuant to the amended and restated declaration of each trust.

                                       22
<PAGE>
                 UNITED STATES FEDERAL INCOME TAX CONSEQUENCES

    In the opinion of Gardner, Carton & Douglas, special United States tax
counsel to OGE Energy, the following discussion is an accurate summary of the
material United States federal income tax consequences of the purchase,
ownership and disposition of the preferred securities.

    Except where we state otherwise, this summary deals only with preferred
securities held as capital assets by a holder who:

    - is a United States person (as defined below), and

    - purchases the preferred securities upon original issuance at their
      original offering price.

A "United States person" is a holder who is one of the following:

    - a citizen or individual resident of the United States,

    - a corporation, partnership or other entity created or organized in or
      under the laws of the United States or any political subdivision of the
      United States,

    - an estate the income of which is subject to United States federal income
      taxation regardless of its source,

    - any trust that (x) is subject to the primary supervision of a court within
      the United States with respect to its administration and the control of
      one or more United States persons or (y) has a valid election in effect
      under applicable United States Treasury regulations to be treated as a
      United States person.

    Your tax treatment may vary depending on your particular situation. This
summary does not address all the tax consequences that may be relevant to
holders that are subject to special tax treatment, such as:

    - banks;

    - real estate investment trusts;

    - regulated investment companies;

    - insurance companies;

    - dealers in securities or currencies;

    - tax-exempt investors;

    - individual retirement and tax deferred accounts;

    - persons holding preferred securities as part of a (1) hedging, (2)
      integrated investment, (3) conversion or (4) constructive sale
      transaction;

    - persons holding preferred securities as part of a straddle; or

    - persons whose functional currency is not the United States Dollar.

    In addition, this summary does not include any description of the following,
either of which may be applicable to you:

    - any alternative minimum tax consequences; or

    - the tax laws of any state, local or foreign government.

    This summary is based on the Internal Revenue Code of 1986, as amended (the
"Code"), the Treasury regulations promulgated under the Code and administrative
and judicial interpretations in effect as of the date of the prospectus. These
income tax laws, regulations and interpretations, however,

                                       23
<PAGE>
may change at any time. Any change could be retroactive to the issuance date of
the preferred securities and could cause the tax consequences to vary
substantially from the consequences described below, possibly having an adverse
effect on a holder of preferred securities.

    The authorities on which this summary is based are subject to various
interpretations. No ruling has been received from the Internal Revenue Service
("IRS") on the matters discussed in this summary and either the IRS or the
courts could disagree with the explanations or conclusions contained in this
summary and the opinion of special tax counsel.

    YOU SHOULD CONSULT YOUR OWN TAX ADVISOR WITH RESPECT TO THE TAX CONSEQUENCES
TO YOU OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF THE PREFERRED SECURITIES,
INCLUDING THE TAX CONSEQUENCES UNDER STATE, LOCAL, FOREIGN, AND OTHER TAX LAWS.
FOR A DISCUSSION OF THE POSSIBLE REDEMPTION OF THE PREFERRED SECURITIES UPON THE
OCCURRENCE OF A TAX EVENT SEE "DESCRIPTION OF THE PREFERRED SECURITIES--SPECIAL
EVENT REDEMPTION."

CLASSIFICATION OF THE TRUST

    We intend to take the position that the trust will be classified as a
grantor trust for United States federal income tax purposes and not as an
association taxable as a corporation. As a condition to the issuance of the
junior subordinated debt securities, Gardner, Carton & Douglas will deliver an
opinion that under current law and assuming full compliance with the terms of
the trust's amended and restated declaration, and based upon certain facts and
assumptions contained in such opinion, the trust will be classified as a grantor
trust for United States federal income tax purposes. As a result, for United
States federal income tax purposes, you generally will be treated as owning an
undivided beneficial ownership interest in the junior subordinated debt
securities. Thus, you will be required to include in your gross income your pro
rata share of the interest income or original issue discount that is paid or
accrued on the junior subordinated debt securities. See "--Interest Income and
Original Issue Discount."

CLASSIFICATION OF THE JUNIOR SUBORDINATED DEBT SECURITIES

    OGE Energy, the trust and you (by your acceptance of a beneficial ownership
interest in a preferred security) will agree to treat the junior subordinated
debt securities as indebtedness for all United States tax purposes. As a
condition to the issuance of the junior subordinated debt securities, Gardner,
Carton & Douglas will deliver an opinion upon issuance of the junior
subordinated debt securities that under current law, and based upon certain
facts and assumptions contained in such opinion, the junior subordinated debt
securities will be classified as indebtedness for United States federal income
tax purposes.

INTEREST INCOME AND ORIGINAL ISSUE DISCOUNT

    We are taking the position that you will generally be taxed on the stated
interest on the junior subordinated debt securities as ordinary income at the
time it is paid or accrued in accordance with your regular method of tax
accounting and will report the interest income to you accordingly. We anticipate
that the junior subordinated debt securities will not be issued with an issue
price that is less than their stated redemption price at maturity. Thus, we are
taking the position that the junior subordinated debt securities are not subject
to the special original issue discount ("OID") rules, at least upon initial
issuance.

    If, however, OGE Energy exercises its right to defer payments of interest on
the junior subordinated debt securities, the junior subordinated debt securities
will become OID instruments at such time. In such case, you will be subject to
the special OID rules described below. Once the junior subordinated debt
securities become OID instruments, they will be taxed as OID instruments for as
long as they remain outstanding.

                                       24
<PAGE>
    The Treasury regulations dealing with OID and the right to defer interest
have not yet been addressed in any rulings or other interpretations by the IRS.
It is possible that, because of OGE Energy's right to defer interest, the IRS
could assert that the junior subordinated debt securities were issued initially
with OID. If the IRS were successful, regardless of whether OGE Energy exercises
its option to defer payments of interest on such junior subordinated debt
securities, you would be subject to the special OID rules described below.

Under the OID economic accrual rules, the following occurs:

    - you would accrue as OID an amount of interest income each year that
      approximates the stated interest payments called for under the terms of
      the junior subordinated debt securities using the
      constant-yield-to-maturity method of accrual (based on the compounding of
      interest) described in section 1272 of the Code regardless of your method
      of accounting;

    - the actual cash distributions of interest you receive on the preferred
      securities in respect of the junior subordinated debt securities would not
      be reported separately as taxable income;

    - any amount of OID included in your gross income (whether or not during a
      deferral period) with respect to the preferred securities will increase
      your tax basis in such preferred securities; and

    - the amount of cash distributions that you receive in respect of such
      accrued OID will reduce your tax basis in such preferred securities.

    As a result, if OGE Energy elects to defer payment of interest on the junior
subordinated debentures, you will be required to include an amount of interest
income in your gross income each year as OID, even though you do not receive
actual cash distributions with respect to the preferred securities and even
though you may use the cash method of accounting.

    If you are a corporate holder of preferred securities, you will not be
entitled to a dividends-received deduction with respect to any income you
recognize with respect to the preferred securities.

DISTRIBUTION OF JUNIOR SUBORDINATED DEBT SECURITIES OR CASH UPON LIQUIDATION OF
  THE TRUST

    As described under the caption "Certain Terms of the Preferred
Securities--Distribution of the Junior Subordinated Debt Securities," the junior
subordinated debt securities held by the trust may be distributed to you in
exchange for your preferred securities when the trust is liquidated. Under
current law, except as described below, this type of distribution would not be
taxable. Upon a distribution, you will receive your pro rata share of the junior
subordinated debt securities previously held indirectly through the trust. Your
holding period and aggregate tax basis in the junior subordinated debt
securities will equal the holding period and aggregate tax basis that you had in
your preferred securities before the distribution.

    OGE Energy has the option to redeem the junior subordinated debt securities
and distribute the resulting cash in liquidation of the trust. This distribution
of cash would be taxable as described below in "--Sales of Preferred
Securities." Further, in other circumstances described under "Certain Terms of
the Preferred Securities--Special Event Redemption," OGE Energy may redeem the
junior subordinated debt securities and distribute cash in liquidation of the
trust. This distribution of cash would also be taxable as described below in
"--Sales of Preferred Securities."

                                       25
<PAGE>
    If you receive junior subordinated debt securities in exchange for your
preferred securities, you would include in gross income interest or OID in
respect of the junior subordinated debt securities received from the trust in
the manner described above under "--Interest Income and Original Issue
Discount."

    If the trust is treated as an association taxable as a corporation, a tax
event will occur. If OGE Energy elects to distribute the junior subordinated
debt securities to you at this time, or to redeem the securities and distribute
the resulting cash, the distribution or the redemption and distribution, would
likely constitute a taxable event to the trust and to you.

SALES OF PREFERRED SECURITIES

    If you sell or OGE Energy redeems your preferred securities, you will
recognize gain or loss equal to the difference between:

    - your amount realized on the sale or redemption of the preferred securities
      (less an amount equal to any accrued but unpaid qualified stated interest
      that you did not previously include in income, which will be taxable as
      such); and

    - your adjusted tax basis in your preferred securities sold or redeemed.

    Your basis in the preferred securities will generally be your original issue
price increased by any OID previously included in income to the date of
disposition and reduced by cash distributions received with respect to such OID.
If you dispose of the preferred securities between interest payment dates, you
will be required to include in your gross income the amount of any accrued but
unpaid interest as ordinary income and your basis in the preferred securities
will be increased by such amount.

    The gain or loss will generally be a long-term capital gain or loss if you
have held your preferred securities for more than one year. Long-term capital
gains of individuals are taxed at a maximum statutory rate of 20%. The
deductibility of capital losses is subject to limitations.

NON-UNITED STATES HOLDERS

    The following discussion only applies to you if you are not a United States
person. As discussed above, the preferred securities will be treated as evidence
of an indirect beneficial ownership interest in the junior subordinated debt
securities. See "--Classification of the Trust." Thus, under present United
States federal income tax law, and subject to the discussion below concerning
backup withholding:

(1) no withholding of United States federal income tax will be required with
    respect to distributions by the trust or any paying agent of principal or
    interest (which for purposes of this discussion includes any OID) to you on
    the preferred securities (or the junior subordinated debt securities) if you
    meet all of the following requirements (the "portfolio interest exemption"):

    - you do not actually or constructively own 10% or more of the total
      combined voting power of all classes of stock of OGE Energy entitled to
      vote within the meaning of section 871(h)(3) of the Code and the
      regulations thereunder;

    - you are not a controlled foreign corporation that is related to OGE Energy
      through stock ownership;

    - you are not a bank whose receipt of interest on the junior subordinated
      debt securities is described in section 881(c)(3)(A) of the Code; and

    - you satisfy the statement requirement (described generally below) set
      forth in section 871(h) and section 881(c) of the Code and the regulations
      thereunder; and

                                       26
<PAGE>
(2) no withholding of United States federal income tax generally will be
    required with respect to any gain you realize upon the sale or other
    disposition of the preferred securities (or the junior subordinated debt
    securities).

    To satisfy the statement requirement referred to in (1) above, you, or a
financial institution holding the preferred securities on your behalf, must
provide, in accordance with specified procedures, to the trust or its paying
agent, a statement to the effect that you are not a United States person.
Currently, you can meet this requirement if one of the following is performed:

    - you provide your name and address, and certify, under penalties of
      perjury, that you are not a United States person (this certification may
      be made on an IRS Form W-8 (or successor form)); or

    - a financial institution holding the preferred securities on your behalf
      certifies, under penalties of perjury, that:

       (a) you provided it with a statement described above; and

       (b) the financial institution furnishes the paying agent with a copy of
           the statement.

    Under final Treasury regulations (the "Final Regulations"), the statement
requirement referred to in (1) above may also be satisfied with other
documentary evidence for interest paid after December 31, 2000 with respect to
an offshore account or through certain foreign intermediaries.

    If you cannot satisfy the requirements of the portfolio interest exemption
described in (1) above, distributions of interest (including any OID) and
premium, in any, made to you with respect to the preferred securities, will be
subject to a 30% United States withholding tax unless you provide OGE Energy or
its paying agent, as the case may be, with one of the following properly
executed forms:

    - IRS Form 1001 (or successor form) claiming an exemption from, or a
      reduction of, this withholding tax under the benefit of a tax treaty; or

    - IRS Form 4224 (or successor form) stating that distributions of interest
      with respect to preferred securities (or the junior subordinated debt
      securities) is not subject to this withholding tax because it is
      effectively connected with your conduct of a trade or business in the
      United States.

    Under the Final Regulations effective for payments after December 31, 2000,
you will generally be required to provide IRS Form W-8 in lieu of IRS Form 1001
and IRS Form 4224, although alternative documentation may be applicable in
certain situations.

    If you are engaged in a trade or business in the United States and interest
on the preferred securities (or junior subordinated debt securities) is
effectively connected with the conduct of your trade or business, you will be
subject to United States federal income tax on such interest on a net income
basis in the same manner as if you were a United States person. However, you
will not be subject to withholding described above.

    You will generally not be subject to United States federal income tax on any
gain you realize upon the sale or other disposition of the preferred securities
(or the junior subordinated debt securities) unless:

    - the gain is effectively connected with your trade or business in the
      United States; or

    - you are an individual and you are present in the United States for 183
      days or more in the taxable year of such sale, exchange or retirement and
      certain other conditions are met.

    In addition, in either case, if you are a foreign corporation, you may be
subject to a branch profits tax equal to 30% (or lesser rate under an applicable
tax treaty) of your effectively connected earnings

                                       27
<PAGE>
and profits for the taxable year, subject to adjustments. For this purpose,
interest and gain with respect to the preferred securities would be included in
your earnings and profits.

INFORMATION REPORTING AND BACKUP WITHHOLDING

    Income on the preferred securities held of record by United States persons
(other than corporations and other exempt holders) will be reported annually to
such holders and to the IRS. Such income will be reported to you on Forms 1099,
which we intend to mail to the holders of record by January 31 following each
calendar year.

    "Backup withholding" at a rate of 31% will apply to payments of interest to
non-exempt United States persons unless you:

    - furnish your taxpayer identification number in the manner prescribed in
      applicable Treasury regulations;

    - certify that such number is correct;

    - certify as to no loss of exemption from backup withholding; and

    - meet certain other conditions.

    In general, no information reporting or backup withholding will be required
with respect to payments made by the trust or any paying agent to non-United
States persons if a statement described in (1) under "Non-United States Holders"
has been received and the payor does not have actual knowledge that you are a
United States person.

    In addition, backup withholding and information reporting will apply to the
proceeds from disposition of preferred securities (or junior subordinated debt
securities) within the United States or conducted outside the United States
through certain United States related financial intermediaries unless the
statement described in (1) under "Non-United States Holders" has been received
(and the payor does not have actual knowledge that you are a United States
person) or you otherwise establish an exemption.

    Any amounts withheld from you under the backup withholding rules generally
will be allowed as a refund or a credit against your United States federal
income tax liability, provided the required information is furnished to the IRS.

                                       28
<PAGE>
                              PLAN OF DISTRIBUTION

    The trust may offer the preferred securities in one or more of the following
ways from time to time:

    - to or through underwriters or dealers;

    - by itself directly;

    - through agents; or

    - through a combination of any of these methods of sale.

    The prospectus supplement relating to an offering of preferred securities
will set forth the terms of that offering, including:

    - the name or names of any underwriters, dealers or agents;

    - the purchase price of the preferred securities and the proceeds to OGE
      Energy from the sale;

    - any underwriting discounts and commissions or agency fees and other items
      constituting underwriters' or agents' compensation;

    - the initial public offering price;

    - any discounts or concessions to be allowed or reallowed or paid to
      dealers; and

    - any securities exchanges on which such preferred securities may be listed.

    Any initial public offering prices, discounts or concessions allowed or
reallowed or paid to dealers may be changed from time to time.

    If underwriters are used in an offering of preferred securities, those
preferred securities will be acquired by the underwriters for their own account
and may be resold from time to time in one or more transactions, including
negotiated transactions, at a fixed public offering price or at varying prices
determined at the time of sale. The securities may be either offered to the
public through underwriting syndicates represented by one or more managing
underwriters or by one or more underwriters without a syndicate. Unless
otherwise set forth in the prospectus supplement, the underwriters will not be
obligated to purchase preferred securities unless specified conditions are
satisfied, and if the underwriters do purchase any preferred securities, they
will purchase all preferred securities.

    In connection with underwritten offerings of the preferred securities and in
accordance with applicable law and industry practice, underwriters may
over-allot or effect transactions that stabilize, maintain or otherwise affect
the market price of the preferred securities at levels above those that might
otherwise prevail in the open market, including by entering stabilizing bids,
effecting syndicate covering transactions or imposing penalty bids, each of
which is described below.

    - A stabilizing bid means the placing of any bid, or the effecting of any
      purchase, for the purpose of pegging, fixing or maintaining the price of a
      security.

    - A syndicate covering transaction means the placing of any bid on behalf of
      the underwriting syndicate or the effecting of any purchase to reduce a
      short position created in connection with the offering.

    - A penalty bid means an arrangement that permits the managing underwriter
      to reclaim a selling concession from a syndicate member in connection with
      the offering when offered securities originally sold by the syndicate
      member are purchased in syndicate covering transactions.

                                       29
<PAGE>
    These transactions may be effected on the NYSE, in the over-the-counter
market, or otherwise. Underwriters are not required to engage in any of these
activities, or to continue such activities if commenced.

    If dealers are used in the sale of preferred securities, OGE Energy will
sell those preferred securities to the dealers as principals. The dealers may
then resell the preferred securities to the public at varying prices to be
determined by the dealers at the time of resale. The names of the dealers and
the terms of the transaction will be set forth in the prospectus supplement
relating to that transaction.

    Preferred securities may be sold directly by OGE Energy to one or more
institutional purchasers, or through agents designated by OGE Energy from time
to time, at a fixed price or prices, which may be changed, or at varying prices
determined at the time of sale. Any agent involved in the offer or sale of the
preferred securities in respect of which this prospectus is delivered will be
named, and any commissions payable by OGE Energy to that agent will be set
forth, in the prospectus supplement relating to that offering. Unless otherwise
indicated in the prospectus supplement, any agent will be acting on a best
efforts basis for the period of its appointment.

    If so indicated in the applicable prospectus supplement, OGE Energy will
authorize agents, underwriters or dealers to solicit offers from certain types
of institutions to purchase preferred securities from the trust at the public
offering price set forth in the prospectus supplement pursuant to delayed
delivery contracts providing for payment and delivery on a specified date in the
future. Those contracts will be subject only to those conditions set forth in
the prospectus supplement and the prospectus supplement will set forth the
commission payable for solicitation of the contracts.

    This prospectus together with any applicable prospectus supplement may also
be used in connection with offers and sales of the preferred securities in
market-making transactions at negotiated prices related to prevailing market
prices at the time of sale.

    Underwriters, dealers and agents may be entitled, under agreements with OGE
Energy and the trust, to indemnification by OGE Energy relating to material
misstatements and omissions. Underwriters, dealers and agents may engage in
transactions with, or perform services for, OGE Energy and affiliates of OGE
Energy in the ordinary course of business.

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

                                       30
<PAGE>
                              ERISA CONSIDERATIONS

    A fiduciary of a pension, profit-sharing or other employee benefit plan
governed by the Employee Retirement Income Security Act of 1974, should consider
the fiduciary standards of ERISA in the context of the ERISA plan's particular
circumstances before authorizing an investment in the preferred securities of
the trust. Among other factors, the fiduciary should consider whether such an
investment is in accordance with the documents governing the ERISA plan and
whether the investment is appropriate for the ERISA plan in view of its overall
investment policy and diversification of its portfolio.

    ERISA and the Code prohibit ERISA plans, as well as individual retirement
accounts and Keogh plans governed by section 4975 of the Code, from engaging in
certain transactions involving "plan assets" with parties that are "parties in
interest" under ERISA or "disqualified persons" under the Code relating to the
plan. The U.S. Department of Labor has issued a final regulation with regard to
whether the underlying assets of an entity in which employee benefit plans
acquire equity interests are deemed to be plan assets.

    Under such regulation, for purposes of ERISA and section 4975 of the Code,
the assets of the trust would be deemed to be "plan assets" of a plan whose
assets were used to purchase preferred securities of the trust if the preferred
securities of the trust were considered to be equity interests in the trust and
no exception to plan asset status were applicable under such regulation.

    If the assets of the trust were deemed to be plan assets of plans that are
holders of the preferred securities of the trust, a plan's investment in the
preferred securities of the trust might be deemed to constitute a delegation
under ERISA of the duty to manage plan assets by a fiduciary investing in
preferred securities of the trust. Also, OGE Energy might be considered a "party
in interest" or "disqualified person" relating to plans whose assets were used
to purchase preferred securities of the trust. If this were the case, an
investment in preferred securities of the trust by a plan might constitute, or
in the course of the operation of the trust give rise to, a prohibited
transaction under ERISA or the Code. In particular, it is likely that under such
circumstances a prohibited extension of credit to OGE Energy would be considered
to occur under ERISA and the Code.

    In addition, OGE Energy might be considered a "party in interest" or
"disqualified person" for certain plans for reasons unrelated to the operation
of the trust, e.g., because of the provision of services by OGE Energy or an
affiliate to the plan. A purchase of preferred securities of the trust by any
such plan would be likely to result in a prohibited extension of credit to OGE
Energy, without regard to whether the assets of the trust constituted plan
assets.

    Because of the possibility that a prohibited extension of credit could occur
as a result of the purchase or holding of the preferred securities of the trust
by a plan, the preferred securities of the trust may not be purchased or held by
any plan or any person investing "plan assets" of any plan, unless such
purchaser or holder is eligible for the exemptive relief available under:

    - Prohibited Transaction Class Exemption 96-23 for transactions determined
      by in-house asset managers,

    - PTCE 95-60 for transactions involving insurance company general accounts,

    - PTCE 91-38 for transactions involving bank collective investment funds,

    - PTCE 90-1 for transactions involving insurance company separate accounts,
      or

    - PTCE 84-14 for transactions determined by independent qualified asset
      managers.

                                       31
<PAGE>
    Any purchaser of the preferred securities of the trust or any interest
therein will be deemed to have represented to the trust that either

       (a) it is not a plan and is not purchasing such securities or interest
           therein on behalf of or with "plan assets" of any plan or

       (b) its purchase and holding of the preferred securities of the trust or
           interest therein is eligible for the exemptive relief available under
           PTCE 96-23, 95-60, 91-38, 90-1 or 84-14.

    Due to the complexity of these rules and the penalties imposed upon persons
involved in prohibited transactions, it is important that any person considering
the purchase of preferred securities of the trust with plan assets consult with
its counsel regarding the consequences under ERISA and the Code of the
acquisition and ownership of preferred securities and the availability of
exemptive relief under the class exemptions listed above. In JOHN HANCOCK MUTUAL
LIFE INSURANCE CO. V. HARRIS TRUST AND SAVINGS BANK, 114 S.Ct. 517 (1993), the
Supreme Court ruled that assets held in an insurance company's general account
may be deemed to be "plan assets" for ERISA purposes under certain
circumstances. The issues raised in HARRIS TRUST have also been the subject of
legislative action, and have been addressed in proposed regulations issued by
the U.S. Department of Labor in December 1997.

                                 LEGAL MATTERS

    Gardner, Carton & Douglas and Rainey, Ross, Rice & Binns will act as legal
counsel to OGE Energy. Richards, Layton & Finger, Wilmington, Delaware, or
counsel to be identified in the applicable prospectus supplement, will act as
legal counsel to the trust. Jones, Day, Reavis and Pogue, Chicago, Illinois,
will act as legal counsel to the underwriters.

                                    EXPERTS

    The consolidated financial statements and schedule of OGE Energy included in
OGE Energy's Form 10-K Annual Report for the fiscal year ended December 31,
1998, to the extent and for the periods indicated in their reports included in
said Form 10-K, have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their reports with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said reports.

    The consolidated financial statements of Tejas Transok Holding, L.L.C.
included in OGE Energy's Form 8-K Current Report dated July 13, 1999, as amended
September 14, 1999, to the extent and for the periods indicated in their report
included in said Form 8-K, have been audited by Arthur Andersen LLP, independent
public accountants, as indicated in their reports with respect thereto, and are
incorporated by reference herein in reliance upon the authority of said firm as
experts in accounting and auditing in giving said reports.

                                       32
<PAGE>
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    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED OR INCORPORATED BY
REFERENCE IN THIS PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS. NO ONE
HAS BEEN AUTHORIZED TO PROVIDE YOU WITH DIFFERENT INFORMATION. YOU SHOULD NOT
ASSUME THAT THE INFORMATION CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR THE
ATTACHED PROSPECTUS IS ACCURATE AS OF ANY DATE OTHER THAN THE DATE ON THE FRONT
COVER OF THE DOCUMENT. SECURITIES ARE NOT BEING OFFERED IN ANY STATE OR
JURISDICTION WHERE THE OFFER IS NOT PERMITTED.

                             ---------------------

                               TABLE OF CONTENTS

<TABLE>
<S>                                     <C>
              PROSPECTUS SUPPLEMENT
OGE Energy Corp.......................        S-2
Selected Financial Data...............        S-3
Ratio of Earnings to Fixed Charges....        S-3
Use of Proceeds.......................        S-4
Accounting Treatment..................        S-4
OGE Energy Capital Trust I............        S-4
Risk Factors..........................        S-5
Description of Securities.............        S-8
Certain Terms of the Preferred
  Securities..........................        S-8
Certain Terms of the Junior
  Subordinated Debt Securities........       S-11
Book-Entry Issuance...................       S-13
Underwriting..........................       S-14

                   PROSPECTUS
Summary Information-Q&A...............          2
Where You Can Find More Information...          5
Use of Proceeds.......................          5
Description of Preferred Securities...          6
Description of the Junior Subordinated
  Debt Securities.....................         13
Description of the Guarantee..........         19
Effect of Obligations Under the Junior
  Subordinated Debt Securities and the
  Guarantee...........................         22
United States Federal Income Tax
  Consequences........................         23
Plan of Distribution..................         29
ERISA Considerations..................         31
Legal Matters.........................         32
Experts...............................         32
</TABLE>

                                 PREFERRED SECURITIES

                                   OGE ENERGY
                                CAPITAL TRUST I

                              % PREFERRED SECURITIES

                (LIQUIDATION AMOUNT $25 PER PREFERRED SECURITY)

                                ----------------

    FULLY AND UNCONDITIONALLY GUARANTEED, TO THE EXTENT SET FORTH HEREIN, BY
                                OGE ENERGY CORP.

                               ------------------

                             PROSPECTUS SUPPLEMENT
                                          , 1999
                          ---------------------------

                                LEHMAN BROTHERS
                           A.G. EDWARDS & SONS, INC.
                               CIBC WORLD MARKETS
                              MERRILL LYNCH & CO.
                                 MORGAN STANLEY
                                  DEAN WITTER
                             PRUDENTIAL SECURITIES

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