PSI ENERGY INC
424B2, 1999-10-18
ELECTRIC SERVICES
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<PAGE>
PROSPECTUS SUPPLEMENT

(TO PROSPECTUS DATED AUGUST 16, 1999)

                                  $265,000,000
                                PSI ENERGY, INC.

                           7.85% DEBENTURES DUE 2007

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

                  INTEREST PAYABLE ON APRIL 15 AND OCTOBER 15
                              -------------------

THE DEBENTURES DUE 2007 WILL MATURE ON OCTOBER 15, 2007. WE WILL PAY INTEREST ON
THE DEBENTURES ON APRIL 15 AND OCTOBER 15 OF EACH YEAR. THE FIRST SUCH PAYMENT
WILL BE MADE ON APRIL 15, 2000. WE MAY REDEEM THE DEBENTURES AT ANY TIME BEFORE
MATURITY. THE DEBENTURES WILL NOT BE SUBJECT TO ANY SINKING FUND.

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

                   PRICE 99.949% AND ACCRUED INTEREST, IF ANY

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

<TABLE>
<CAPTION>
                                                                           UNDERWRITING
                                                                          DISCOUNTS AND      PROCEEDS TO
                                                       PRICE TO PUBLIC     COMMISSIONS         COMPANY
                                                       ---------------    -------------      -----------
<S>                                                    <C>                <C>               <C>
 PER DEBENTURE.......................................     99.949%             .625%            99.324%
 TOTAL...............................................   $264,864,850        $1,656,250       $263,208,600
</TABLE>

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
APPROVED OR DISAPPROVED THESE SECURITIES, OR DETERMINED IF THIS PROSPECTUS
SUPPLEMENT OR THE ACCOMPANYING PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY
REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

MORGAN STANLEY & CO. INCORPORATED EXPECTS TO DELIVER THE DEBENTURES TO
PURCHASERS ON OCTOBER 20, 1999.

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

MORGAN STANLEY DEAN WITTER
              ABN AMRO INCORPORATED
                            BANC OF AMERICA SECURITIES LLC
                                           MERRILL LYNCH & CO.

OCTOBER 15, 1999
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<S>                                                           <C>
                        PROSPECTUS SUPPLEMENT

About this Prospectus Supplement............................    S-2
Incorporation of Certain Documents by Reference.............    S-3
Selected Income Information.................................    S-4
Capitalization..............................................    S-4
Ratio of Earnings to Fixed Charges..........................    S-5
Use of Proceeds.............................................    S-5
Certain Terms of the Debentures.............................    S-5
Underwriting................................................    S-9
Legal Matters...............................................    S-9

                              PROSPECTUS

About this Prospectus.......................................      2
Where You Can Find More Information.........................      2
Incorporation of Certain Documents by Reference.............      2
The Company.................................................      3
Use of Proceeds.............................................      3
Description of Debt Securities..............................      3
Plan of Distribution........................................     10
Legal Matters...............................................     12
Experts.....................................................     12
</TABLE>

                        ABOUT THIS PROSPECTUS SUPPLEMENT

    You should read carefully this Prospectus Supplement along with the
accompanying Prospectus before you invest. Both documents contain important
information you should consider when making your investment decision. This
Prospectus Supplement contains information about the Debentures and the
accompanying Prospectus contains information about the Company and our debt
securities generally. This Prospectus Supplement may add, update or change
information in the accompanying Prospectus. You should rely only on the
information contained or incorporated by reference in this Prospectus Supplement
and the accompanying Prospectus. You should assume that the information
appearing in this Prospectus Supplement or the accompanying Prospectus, as well
as the information we previously filed with the Securities and Exchange
Commission and incorporated by reference, is current only as of its respective
date. We are not, and the Underwriters are not, making an offer to sell these
securities in any jurisdiction where the offer or sale of such securities is not
permitted. We have not authorized anyone else to provide you with information
different from that contained in this Prospectus Supplement and the accompanying
Prospectus. In this Prospectus Supplement and the accompanying Prospectus,
"PSI," the "Company," "we," "us" and "our" refer to PSI Energy, Inc.

                                      S-2
<PAGE>
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The Securities and Exchange Commission allows us to "incorporate by
reference" the information we file with them, which means that we can disclose
important information to you by referring you to those documents. The
information incorporated by reference is an important part of this Prospectus
Supplement, and information that we file later with the Securities and Exchange
Commission will automatically update and supersede the information in this
Prospectus Supplement. We incorporate by reference the documents listed below
and any future filings made with the Securities and Exchange Commission under
Sections 13(a), 13(c), 14, or 15(d) of the Securities Exchange Act of 1934, as
amended (the "Exchange Act") until we sell all of the Debentures.

<TABLE>
<S>                                        <C>
 (i) PSI's Annual Report on Form 10-K      For year ended December 31, 1998

(ii) PSI's Quarterly Reports on Form 10-Q  Quarters ended March 31, 1999 and June 30,
                                           1999

(iii) PSI's Current Report on Form 8-K     Dated August 10, 1999
</TABLE>

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

                               William L. Sheafer
                          Vice President and Treasurer
                                PSI Energy, Inc.
                             139 East Fourth Street
                            Cincinnati, Ohio, 45202
                                 (513) 287-2644

                                      S-3
<PAGE>
                          SELECTED INCOME INFORMATION

    The following table sets forth certain financial information of PSI. This
information is derived from the historical results of the Company. See
"Incorporation of Certain Documents by Reference" in the accompanying
Prospectus. All amounts are in thousands.

<TABLE>
<CAPTION>
                                                SIX MONTHS           YEAR ENDED DECEMBER 31,
                                              ENDED JUNE 30,   ------------------------------------
                                                   1999         1998(1)        1997         1996
                                              --------------   ----------   ----------   ----------
<S>                                           <C>              <C>          <C>          <C>
Operating Revenues..........................     $945,951      $2,403,038   $1,960,395   $1,331,962
Operating Income............................      146,766         161,244      289,415      278,956
Net Income..................................       65,421          52,038      132,205      125,678
Preferred Dividend Requirement..............        2,301           5,659       11,701       12,537
                                                 --------      ----------   ----------   ----------
Net Income Applicable to Common Stock.......     $ 63,120      $   46,379   $  120,504   $  113,141
                                                 ========      ==========   ==========   ==========
</TABLE>

- ---------

Notes:

  (1) The period reflects charges against income relating to:

    - a one-time charge of $80 million (before taxes) reflecting the
      implementation of a 1989 settlement of a dispute with the Wabash Valley
      Power Association, Inc. that resulted from the cancellation of the Marble
      Hill nuclear power station in 1984; and

    - the recording of $62 million (before taxes) of unrealized losses related
      to energy marketing and trading operations. For additional information,
      see PSI's Annual Report on Form 10-K for the year ended December 31, 1998,
      which is incorporated by reference into this Prospectus Supplement.

    In July 1999, PSI had a $41 million, after tax, reduction in net income,
related to extreme weather conditions late in the month. For additional
information, see PSI's Form 8-K dated August 10, 1999, which is incorporated by
reference into this Prospectus Supplement.

                                 CAPITALIZATION

<TABLE>
<CAPTION>
                                                      OUTSTANDING                    OUTSTANDING
                                                     JUNE 30, 1999                DECEMBER 31, 1998
                                              ----------------------------   ----------------------------
                                                                 % OF                           % OF
                                                AMOUNT      CAPITALIZATION     AMOUNT      CAPITALIZATION
                                              -----------   --------------   -----------   --------------
                                              (THOUSANDS)                    (THOUSANDS)
<S>                                           <C>           <C>              <C>           <C>
Long-term Debt..............................  $1,013,473          47.7%      $1,025,659          49.4%
Cumulative Preferred Stock Not Subject to
  Mandatory Redemption......................      71,919           3.4           71,923           3.5
Common Stock Equity.........................   1,039,250          48.9          975,648          47.1
                                              ----------         -----       ----------         -----
  Total Capitalization......................  $2,124,642         100.0%      $2,073,230         100.0%
                                              ==========         =====       ==========         =====
</TABLE>

                                      S-4
<PAGE>
                       RATIO OF EARNINGS TO FIXED CHARGES

    Listed below is the ratio of earnings to fixed charges for the six months
ended June 30, 1999 and for each year of the five year period ended
December 31, 1998.

<TABLE>
<CAPTION>
                                                       SIX MONTHS
                                                         ENDED                    YEAR ENDED DECEMBER 31,
                                                        JUNE 30,    ----------------------------------------------------
                                                          1999        1998       1997       1996       1995       1994
                                                       ----------   --------   --------   --------   --------   --------
<S>                                                    <C>          <C>        <C>        <C>        <C>        <C>
Ratio of Earnings to Fixed Charges..................      3.30        1.78       3.31       3.35       3.55       2.52
</TABLE>

    For the purpose of computing the ratio of earnings to fixed charges,
earnings consist of pre-tax income from continuing operations plus fixed
charges. Fixed charges consist of:

    - interest expense;

    - amortized premiums, discounts and capitalized expenses related to
      indebtedness; and

    - an estimate of the interest within rental expense.

                                USE OF PROCEEDS

    We anticipate our net proceeds from the sale of the Debentures will be
approximately $263 million after deducting underwriting discounts and
commissions and estimated expenses of approximately $2 million. We plan to use
the proceeds from the sale of the Debentures to fund the buyout of the remaining
term of a coal gasification contract we have with Dynegy Inc. (formerly Destec
Energy Inc.). In November 1995, PSI and Destec entered into a 25-year
contractual agreement for coal gasification services at our Wabash River
Generating Station. Currently, natural gas prices have fallen to a level which
causes the synthetic gas supply taken under this agreement to be uneconomical.
In September 1999, the Indiana Utility Regulatory Commission approved our
proposal to buy out the contract and to convert the plant to burn natural gas.
PSI will convert the generating unit to burn natural gas and install the
necessary infrastructure at a cost of approximately $15 million. The remaining
proceeds will be used to fund the termination payment to Dynegy. For more
information, see our Annual Report on Form 10-K for the year ended December 31,
1998 and our Quarterly Report on Form 10-Q for the quarter ended June 30, 1999,
which are both incorporated into this Prospectus Supplement by reference.

                        CERTAIN TERMS OF THE DEBENTURES

    The following description of the particular terms of the Debentures
supplements the description of the general terms and provisions of the
Debentures set forth in the accompanying Prospectus under the caption
"Description of Debt Securities."

PRINCIPAL AMOUNT, INTEREST AND MATURITY

    We are issuing $265,000,000 of Debentures which will mature on October 15,
2007. The Debentures will be issued under the Indenture dated as of
November 15, 1996 between the Company and Fifth Third Bank, as Trustee, as
supplemented by a Seventh Supplemental Indenture dated as of October 20, 1999.
The Debentures will be designated as specified on the cover of this Prospectus
Supplement. The Debentures will be limited to a total of $265,000,000 aggregate
principal amount.

    We will pay interest at an annual rate of 7.85% on the Debentures on
April 15 and October 15 of each year beginning April 15, 2000. Interest will
accrue from October 20, 1999. The amount of interest payable for any period will
be computed based on a 360-day year of twelve 30-day months.

                                      S-5
<PAGE>
    Interest will be paid to holders of record on the business day immediately
preceding the interest payment date. A business day is any day other than a
Saturday or Sunday or a day that banking institutions in the City of New York
are authorized or obligated to close.

    Principal of, premium (if any) and interest on the Debentures will initially
be payable, and the Debentures will be transferable at, the corporate trust
office of the Trustee in the City of Cincinnati, located at 38 Fountain Square
Plaza, Cincinnati, Ohio 45263. Alternatively, we may pay interest by check
mailed to the registered holders of the Debentures.

    The Debentures will not be secured and will rank equally with any other
indebtedness which is issued under the Indenture and not specifically
subordinated to the Debentures.

    The Debentures will be issued only in fully registered form in denominations
of $1,000 and integral multiples of $1,000.

REDEMPTION

    Subject to the terms of the Indenture, we will have the right to redeem the
Debentures, in whole or from time to time in part, until maturity (such
redemption, a "Make-Whole Redemption," and the date thereof, the "Redemption
Date"), upon not less than 30 nor more than 60 days notice to the holders, at a
redemption price equal to the sum of (i) the principal amount of the Debentures
being redeemed plus accrued and unpaid interest thereon to the Redemption Date,
and (ii) the Make-Whole Amount (as defined below), if any, with respect to the
Debentures being redeemed.

    "Make-Whole Amount" means, in connection with any Make-Whole Redemption of
any Debentures, the excess, if any, of (i) the sum, as determined by a Quotation
Agent (as defined herein) of the present value of the principal amount of such
Debentures, together with scheduled payments of interest from the Redemption
Date to October 15, 2007, in each case discounted to the Redemption Date on a
semi-annual basis (assuming a 360-day year consisting of twelve 30-day months)
at the Adjusted Treasury Rate (as defined herein) over (ii) 100% of the
principal amount of the Debentures to be redeemed.

    "Adjusted Treasury Rate" means, with respect to any Redemption Date for a
Make-Whole Redemption, the rate per annum equal to the semi-annual equivalent
yield to maturity of the Comparable Treasury Issue, calculated using a price for
the Comparable Treasury Issue (expressed as a percentage of its principal
amount) equal to the Comparable Treasury Price for such Redemption Date,
calculated on the third business day preceding the Redemption Date, plus in each
case .25% (25 basis points).

    "Comparable Treasury Issue" means the United States Treasury security
selected by the Quotation Agent as having a maturity comparable to the remaining
term from the Redemption Date to the Stated Maturity of the Debentures that
would be utilized, at the time of selection and in accordance with customary
financial practice, in pricing new issues of corporate debt securities of
comparable maturity to the remaining term of the Debentures.

    "Quotation Agent" means the Reference Treasury Dealer selected by the
Trustee after consultation with the Company. "Reference Treasury Dealer" means a
primary U.S. Government securities dealer.

    "Comparable Treasury Price" means, with respect to any Redemption Date for a
Make-Whole Redemption, (i) the average of the bid and asked prices for the
Comparable Treasury Issue (expressed in each case as a percentage of its
principal amount) on the third business day preceding such Redemption Date, as
set forth in the daily statistical release designated "H.15" (or any successor
release) published by the Board of Governors of the Federal Reserve System or
(ii) if such release (or any successor release) is not published or does not
contain such prices on such business day, (A) the average of the Reference
Treasury Dealer Quotations for such Redemption Date, after excluding the highest
and lowest of such Reference Treasury Dealer Quotations, or (B) if the Trustee
obtains fewer than three such Reference Treasury Dealer Quotations, the average
of such Quotations.

                                      S-6
<PAGE>
    "Reference Treasury Dealer Quotations" means, with respect to each Reference
Treasury Dealer and any Redemption Date for a Make-Whole Redemption, the
average, as determined by the Trustee, of the bid and asked prices for the
Comparable Treasury Issue (expressed in each case as a percentage of its
principal amount) quoted in writing to the Trustee by such Reference Treasury
Dealer at 5:00 p.m., New York City time, on the third business day preceding
such Redemption Date.

    Notice of any redemption by the Company will be mailed at least 30 days but
not more than 60 days before any Redemption Date to each holder of Debentures to
be redeemed. If less than all the Debentures are to be redeemed at the option of
the Company, the Trustee shall select, in such manner as it shall deem fair and
appropriate, the Debentures of such series to be redeemed in whole or in part.

    Unless the Company defaults in payment of the Redemption Price, on and after
any Redemption Date, interest will cease to accrue on the Debentures or portions
thereof called for redemption.

    The Debentures will not be redeemable at the option of any holder prior to
maturity and will not be subject to any sinking fund.

GLOBAL SECURITIES

    We will issue the Debentures in book-entry only form, which means that they
will be represented by one permanent global certificate registered in the name
of The Depository Trust Company, New York, New York ("DTC"), or its nominee.

    DTC will keep a computerized record of its participants (for example, your
broker) whose clients purchased the Debentures. The participant will then keep a
record of its clients who purchased the Debentures. The global certificate
representing the Debentures may not be transferred, except that DTC, its
nominees and their successors may transfer the entire global certificate to one
another.

    By using book-entry only form, we will not issue certificates to individual
holders of the Debentures or register the ownership interests in the Debentures
of individual holders. Beneficial interests in the global certificate will be
shown on, and transfers of interests in the global certificate will be made only
through, records maintained by DTC and its participants.

    DTC has provided us with the following information: DTC is a limited-purpose
trust company organized under the New York Banking Law, a "banking organization"
within the meaning of the New York Banking Law, a member of the United States
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. DTC holds securities that
its participants ("Direct Participants") deposit with DTC. DTC also facilitates
the settlement among Direct Participants of securities transactions, such as
transfers and pledges, in deposited securities through computerized records for
Direct Participants' accounts. This eliminates the need to exchange
certificates. Direct Participants include securities brokers and dealers, banks,
trust companies, clearing corporations and certain other organizations.

    DTC's book-entry system is also used by other organizations, such as
securities brokers and dealers, banks and trust companies that work through a
Direct Participant. The rules that apply to DTC and its participants are on file
with the Securities and Exchange Commission.

    DTC is owned by a number of its Direct Participants and by the New York
Stock Exchange, Inc., the American Stock Exchange, Inc. and the National
Association of Securities Dealers, Inc.

    We will wire principal and interest payments to DTC's nominee. We and the
Trustee will treat DTC's nominee as the owner of the global certificate for all
purposes. Accordingly, we will have no direct responsibility or liability to pay
amounts due on the Debentures to owners of beneficial interests in the global
certificate.

                                      S-7
<PAGE>
    It is DTC's current practice, upon receipt of any payment of principal and
interest, to credit Direct Participants' accounts on the payment date according
to their respective holdings of beneficial interests in the global certificate
as shown on DTC's records. In addition, it is DTC's current practice to assign
any consenting or voting rights to Direct Participants whose accounts are
credited with Debentures on a record date by using an omnibus proxy. Payments by
participants to owners of beneficial interests in the global certificate, and
voting by participants, will be governed by the customary practices between the
participants and owners of beneficial interests, as is the case with securities
held for the account of customers registered in "street name." However, these
payments will be the responsibility of the participants and not of DTC, the
Trustee or PSI.

    In addition, DTC's management is aware that some computer applications,
systems, and the like for processing data that are dependent upon calendar
dates, including dates before, on and after January 1, 2000, may encounter "Year
2000 problems." DTC has informed 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 (including
principal and income payments) 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. However, DTC's ability to
perform its services properly is also dependent upon other parties, including
issuers and their agents, as well as third party vendors from whom DTC licenses
software and hardware, and third party vendors on whom DTC relies for
information or the provision of services, including telecommunication and
electrical utility service providers, among others. DTC has informed the
financial community that it is contacting, and will continue to contact, third
party vendors from whom DTC acquires services to impress upon them the
importance of such services being Year 2000 compliant, and to determine the
extent of their efforts for Year 2000 remediation and, as appropriate, testing
of their services. In addition, DTC is in the process of developing contingency
plans as it deems appropriate.

    Debentures represented by the global certificate will be exchangeable for
Debenture certificates with the same terms in authorized denominations only if:

    - DTC notifies us that it is unwilling or unable to continue as depositary;

    - DTC ceases to be a clearing agency registered under applicable law and a
      successor depositary is not appointed by us within 90 days;

    - We instruct the Trustee that the global certificate is now exchangeable;
      or

    - An event of default under the Indenture has occurred and is continuing.

    A further description of the Depositary's procedures with respect to the
Debentures is set forth under "Description of Debt Securities--Global
Securities" in the accompanying Prospectus.

DEFEASANCE

    The Debentures will be subject to defeasance and covenant defeasance as
provided under the caption "Description of Debt Securities--Defeasance and
Covenant Defeasance" in the accompanying Prospectus.

                                      S-8
<PAGE>
                                  UNDERWRITING

    Under the terms and subject to the conditions contained in an underwriting
agreement, dated October 15, 1999 (the "Underwriting Agreement"), the
underwriters named below (the "Underwriters") have severally agreed to purchase,
and we have agreed to sell to them, severally, the respective principal amount
of the Debentures set forth opposite their respective names below:

<TABLE>
<CAPTION>
                                                               PRINCIPAL
                                                               AMOUNT OF
                            NAME                               DEBENTURES
                            ----                               ----------
<S>                                                           <C>
Morgan Stanley & Co. Incorporated...........................  $159,000,000
ABN AMRO Incorporated.......................................    19,875,000
Banc of America Securities LLC..............................    19,875,000
Merrill Lynch, Pierce, Fenner & Smith
          Incorporated......................................    66,250,000
                                                              ------------
      Total.................................................  $265,000,000
                                                              ============
</TABLE>

    The Underwriting Agreement provides that the obligations of the several
Underwriters to pay for and accept delivery of the Debentures is subject to,
among other things, the approval of certain legal matters by their counsel and
certain other conditions. The Underwriters are obligated to take and pay for all
of the Debentures if any are taken.

    The Underwriters initially propose to offer part of the Debentures directly
to the public at the public offering price set forth on the cover page hereof
and part to certain dealers at a price that represents a concession not in
excess of .375% of the principal amount of the Debentures. Any Underwriter may
allow, and any such dealers may reallow, a concession to certain other dealers
not to exceed .250% of the principal amount of the Debentures. After the initial
offering of the Debentures, the offering price and other selling terms may from
time to time be varied by the Underwriters.

    PSI has agreed to indemnify the several Underwriters against certain
liabilities, including liabilities under the Securities Act of 1933, as amended.

    We do not intend to apply for listing of the Debentures on a national
securities exchange, but have been advised by the Underwriters that they intend
to make a market in the Debentures. The Underwriters are not obligated, however,
to do so and may discontinue their market making at any time without notice. No
assurance can be given as to the liquidity of the trading market for the
Debentures.

    In order to facilitate the offering of the Debentures, the Underwriters may
engage in transactions that stabilize, maintain or otherwise affect the price of
the Debentures. Specifically, the Underwriters may overallot in connection with
the offering, creating a short position in the Debentures for their own account.
In addition, to cover overallotments or to stabilize the price of the
Debentures, the Underwriters may bid for, and purchase, the Debentures in the
open market. Finally, the Underwriters may reclaim selling concessions allowed
to an Underwriter or a dealer for distributing the Debentures in the offering,
if they repurchase previously distributed Debentures in transactions to cover
syndicate short positions, in stabilization transactions or otherwise. Any of
these activities may stabilize or maintain the market price for the Debentures
above independent market levels. The Underwriters are not required to engage in
these activities and may end any of these activities at any time.

    Certain of the Underwriters and their respective affiliates have, from time
to time, performed various investment or commercial banking and financial
advisory services for PSI and/or its affiliates in the ordinary course of
business.

                                 LEGAL MATTERS

    The validity of the Debentures will be passed upon for us by Taft,
Stettinius & Hollister LLP, Cincinnati, Ohio. Davis Polk & Wardwell, New York,
New York will pass upon certain matters for the Underwriters.

                                      S-9
<PAGE>
PROSPECTUS

                                PSI ENERGY, INC.

                                    --------

                                  $665,000,000
                                DEBT SECURITIES

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

WE WILL PROVIDE THE SPECIFIC TERMS OF THESE SECURITIES IN SUPPLEMENTS TO THIS
       PROSPECTUS. YOU SHOULD READ THIS PROSPECTUS AND THE
                    SUPPLE   MENTS CAREFULLY BEFORE YOU
                                    INVEST.

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

THE SECURITIES AND EXCHANGE COMMISSION AND STATE SECURITIES REGULATORS HAVE NOT
        APPROVED OR DISAPPROVED THESE SECURITIES, OR DETERMINED IF THIS
      PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE
                     CONTRARY IS A CRIMINAL OFFENSE.

THE DATE OF THIS PROSPECTUS IS AUGUST 16, 1999
<PAGE>
                             ABOUT THIS PROSPECTUS

    This prospectus is part of a registration statement that we filed with the
Securities and Exchange Commission (the "Commission") utilizing a "shelf"
registration process. Under this shelf process, we may, from time to time, sell
any combination of the securities described in this prospectus in one or more
offerings up to a total dollar amount of $665,000,000. This prospectus provides
you with a general description of the securities we may offer. Each time we sell
securities, we will provide a prospectus supplement that will contain specific
information about the terms of that offering. The prospectus supplement may also
add, update or change information contained in this prospectus. You should read
both this prospectus and any prospectus supplement together with additional
information described under the heading "Where You Can Find More Information".

    In this prospectus, unless the context indicates otherwise, the words "PSI,"
"we," "our," "ours" and "us" refer to PSI Energy, Inc.

                      WHERE YOU CAN FIND MORE INFORMATION

    We file annual, quarterly and special reports, proxy statements and other
information with the Commission. You may read and copy any document that we file
at the Public Reference Room of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549. Information on the operation of the Public Reference
Room may be obtained by calling the Commission at 1-800-SEC-0330. You may also
read our filings at the regional offices of the Commission located at Citicorp,
500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and 7 World Trade
Center, New York, New York 10048 or over the Internet at the Commission's home
page at http://www.sec.gov.

    This prospectus is part of a registration statement on Form S-3 filed with
the Commission under the Securities Act of 1933 (the "Securities Act"). It does
not contain all of the information that is important to you. You should read the
registration statement for further information with respect to PSI and the debt
securities. Statements contained in this prospectus concerning the provisions of
any document filed as an exhibit to the registration statement or otherwise
filed with the Commission highlights selected information, and in each instance
reference is made to the copy of the document filed.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    Our Annual Report on Form 10-K for the year ended December 31, 1998, our
Quarterly Reports on Form 10-Q for the quarters ended March 31 and June 30, 1999
and our Current Report on Form 8-K dated August 10, 1999, filed pursuant to the
Securities Exchange Act of 1934 (the "Exchange Act"), are incorporated into this
prospectus by reference.

    We also incorporate by reference any filings made with the Commission
pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act subsequent to
the date of this prospectus and until we sell all of the debt securities. You
may request a copy of these filings at no cost, by writing or telephoning the
office of Mr. William L. Sheafer, Vice President and Treasurer, PSI
Energy, Inc., 139 East Fourth Street, Cincinnati, Ohio 45202, telephone number
(513) 287-2644.

                                       2
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                                  THE COMPANY

    We are an electric public utility company incorporated in Indiana. We are
primarily engaged in the production, transmission, distribution, and sale of
electric energy in north central, central and southern Indiana. The area we
serve has an estimated population of 2.1 million people located in 69 of the
state's 92 counties, and includes the cities of Bloomington, Columbus, Kokomo,
Lafayette, New Albany and Terre Haute.

    We are a wholly-owned subsidiary of Cinergy Corp., a registered holding
company under the Public Utility Holding Company Act of 1935.

    Our principal executive offices are located at 1000 East Main Street,
Plainfield, Indiana 46168; our telephone number is (317) 839-9611.

                                USE OF PROCEEDS

    Unless otherwise set forth in a prospectus supplement, the net proceeds from
the sale of the debt securities will be used for general corporate purposes
including repayment of debt and construction costs.

                         DESCRIPTION OF DEBT SECURITIES

    This prospectus describes certain general terms and provisions of the debt
securities. When we offer to sell a particular series of debt securities, we
will describe the specific terms for the debt securities in a supplement to this
prospectus. The prospectus supplement will also indicate whether the general
terms and provisions described in this prospectus apply to a particular series
of debt securities. The debt securities will be issued under the Indenture dated
as of November 15, 1996 between us and Fifth Third Bank, as Trustee.

    We have summarized certain terms and provisions of the Indenture. The
summary is not complete. The Indenture has been incorporated by reference as an
exhibit to the registration statement of which this prospectus forms a part. You
should read the Indenture for the provisions which may be important to you.
Capitalized terms used in this summary have the meanings specified in the
Indenture. The Indenture is subject to and governed by the Trust Indenture Act
of 1939, as amended.

GENERAL

    The Indenture allows us to issue debt securities in an unlimited amount from
time to time.

    The debt securities will be unsecured obligations of PSI.

    The relevant prospectus supplement will describe the terms of any debt
securities being offered, including:

    - the title of the debt securities;

    - any limit on the aggregate principal amount of the debt securities;

    - the date or dates on which the principal of any of the debt securities
      will be payable;

    - the rate or rates at which any of the debt securities will bear interest,
      if any;

    - the date from which interest, if any, on the debt securities will accrue,
      the dates on which interest, if any, will be payable, the date on which
      payment of interest, if any, will commence, and the record dates for any
      interest payments;

    - the right, if any, to extend interest payment periods and the duration of
      any extension;

    - any redemption, repayment or sinking fund provisions;

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<PAGE>
    - the place or places where the principal of and any premium and interest on
      any of the debt securities will be payable;

    - the denominations in which any of the debt securities will be issuable;

    - the index, if any, with reference to which the amount of principal of or
      any premium or interest on the debt securities will be determined;

    - any addition to or change in the events of default applicable to any of
      the debt securities and any change in the right of the Trustee or the
      holders to declare the principal amount of any of the debt securities due
      and payable;

    - any addition to or change in the covenants in the Indenture;

    - the applicability of or any change in the subordination provisions of the
      Indenture for a series of debt securities; and

    - any other terms of the debt securities inconsistent with the provisions of
      the Indenture.

SUBORDINATION OF CERTAIN DEBT SECURITIES

    The Indenture provides that one or more series of debt securities (the
"Junior Subordinated Securities") may be subordinate and subject in right of
payment to the prior payment in full of all Senior Debt of the Company.
(Section 1401).

    No payment of principal of (including redemption and sinking fund payments),
premium, if any, or interest on, the Junior Subordinated Securities may be made
if any Senior Debt is not paid when due, any default has not been cured or
waived, or if the maturity of any Senior Debt has been accelerated because of a
default. (Section 1402). Upon any distribution of assets of the Company to
creditors upon any dissolution, winding-up, liquidation or reorganization,
whether voluntary or involuntary or in bankruptcy, insolvency, receivership or
other proceedings, all principal of, and premium, if any, and interest due or to
become due on, all Senior Debt must be paid in full before the holders of the
Junior Subordinated Securities are entitled to receive or retain any payment.
(Section 1403). The rights of the holders of the Junior Subordinated Securities
will be subrogated to the rights of the holders of Senior Debt to receive
payments or distributions applicable to Senior Debt. (Section 1404).

    The term "Senior Debt" means the principal of, premium, if any, interest on
and any other payment due pursuant to any of the following, whether outstanding
at the date of execution of the Indenture or thereafter incurred, created or
assumed:

        (a) all indebtedness of the Company evidenced by notes, debentures,
    bonds, or other securities sold by the Company for money, excluding Junior
    Subordinated Securities, but including all first mortgage bonds of the
    Company outstanding from time to time;

        (b) all indebtedness of others of the kinds described in the preceding
    clause (a) assumed by or guaranteed in any manner by the Company; and

        (c) all renewals, extensions, or refundings of indebtedness of the kinds
    described in any of the preceding clauses (a) and (b);

unless, in the case of any particular indebtedness, renewal, extension or
refunding, the instrument creating or evidencing the same or the assumption or
guarantee of the same expressly provides that such indebtedness, renewal,
extension or refunding is not superior in right of payment to or is PARI PASSU
with the Junior Subordinated Securities. (Section 101).

    The Indenture does not limit the aggregate amount of Senior Debt that the
Company may issue. As of June 30, 1999, outstanding Senior Debt of the Company
aggregated approximately $1.3 billion.

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<PAGE>
EXCHANGE, REGISTER AND TRANSFER

    The debt securities of each series will be issuable only in fully registered
form without coupons.

    The debt securities may be presented for exchange, registered and
transferred in the manner, at the places and subject to the restrictions set
forth in the debt securities and the relevant prospectus supplement. Subject to
the limitations noted in the Indenture, you will not have to pay for such
services, except for any taxes or other governmental charges associated with
such services. You may transfer any debt securities in bearer form and the
associated coupons, if any, by delivering them.

GLOBAL SECURITIES

    We may issue registered debt securities of a series in the form of one or
more fully registered global debt securities (each "registered global security")
that we will deposit with a depositary (or with a nominee of a depositary)
identified in the prospectus supplement relating to such series and registered
in the name of the depositary (or a nominee). In such a case, we will issue one
or more registered global securities. The face of such registered global
securities, will set forth the aggregate principal amount of the series of debt
securities that such global registered securities represent. The depositary (or
its nominee) will not transfer any registered global security unless and until
it is exchanged in whole or in part for debt securities in definitive registered
form, except that:

    - the depositary may transfer the whole registered global security to a
      nominee;

    - the depositary's nominee may transfer the whole registered global security
      to the depositary;

    - the depositary's nominee may transfer the whole registered global security
      to another of the depositary's nominees; and

    - the depositary (or its nominee) may transfer the whole registered global
      security to its (or its nominee's) successor.

    The Depository Trust Company, which may be a depositary, currently accepts
only debt securities that are denominated in U.S. dollars.

DEPOSITARY ARRANGEMENTS

    We will describe the specific terms of the depositary arrangement with
respect to any portion of a series of debt securities to be represented by a
registered global security in the prospectus supplement relating to such series.
We anticipate that the following provisions will apply to all depositary
arrangements.

    Generally, ownership of beneficial interests in a registered global security
will be limited to persons that have accounts with the depositary for such
registered global security ("participants") or persons that may hold interests
through participants. Upon the issuance of a registered global security, the
depositary will credit, on its book-entry registration and transfer system, the
participants' accounts with the respective principal amounts of the debt
securities represented by such registered global security that are beneficially
owned by such participants.

    Any dealers, underwriters or agents participating in the distribution of
such debt securities will designate the accounts to credit. For participants,
the depositary will maintain the only record of their ownership of a beneficial
interest in the registered global security and they will only be able to
transfer such interests through the depositary's records. For people who hold
through a participant, the relevant participant will maintain such records for
beneficial ownership and transfer. The laws of some states may require that
certain purchasers of securities take physical delivery of such securities in
definitive form. Such limits and such laws may impair the ability to own,
transfer or pledge beneficial interests in registered global securities.

    So long as the depositary (or its nominee) is the record owner of a
registered global security, such depositary (or its nominee) will be considered
the sole owner or holder of the debt securities represented by

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<PAGE>
such registered global security for all purposes under the Indenture. Except as
set forth below, owners of beneficial interests in a registered global security
will not be entitled to have the debt securities represented by such registered
global security registered in their names, and will not receive or be entitled
to receive physical delivery of such debt securities in definitive form and will
not be considered the owners or holders under the Indenture. Accordingly, each
person owning a beneficial interest in a registered global security must rely on
the procedures of the depositary and, if such person is not a participant, on
the procedures of the participant through which such person owns its interest,
to exercise any rights of a holder under the Indenture. We understand that under
existing industry practices, if we request any action of holders or if any owner
of a beneficial interest in a registered global security desires to give or take
any action allowed under the Indenture, the depositary would authorize the
participants holding the relevant beneficial interests to give or take such
action, and such participants would authorize beneficial owners owning through
such participants to give or take such action or would otherwise act upon the
instruction of beneficial owners holding through them.

INTEREST AND PREMIUM

    Payments of principal, premium, if any, and any interest on debt securities
represented by a registered global security registered in the name of a
depositary (or its nominee) will be made to the depositary (or its nominee) as
the registered owner of such registered global security. We and our agents will
have no responsibility or liability for any aspect of the records relating to or
payments made on account of beneficial ownership interests in any registered
global security or for maintaining, supervising or reviewing any records
relating to such beneficial ownership interests, and neither will the trustee
and its agents.

    We expect that the depositary for any debt securities represented by a
registered global security, upon receipt of any payment of principal, premium,
if any, or any interest in respect of such registered global security, will
immediately credit participants' accounts with payments in amounts proportionate
to their respective beneficial interests in such registered global security as
shown on the depositary's records. We also expect that payments by participants
to owners of beneficial interests in such registered global security held
through such participants will be governed by standing customer instructions and
customary practices, as is now the case with securities held for the accounts of
customers in bearer form or registered in "street name," and will be the
responsibility of such participants.

WITHDRAWAL OF DEPOSITARY

    If the depositary for any debt securities represented by a registered global
security notifies us that it is unwilling or unable to continue as depositary or
ceases to be eligible under applicable law, and a successor depositary is not
appointed within 90 days, debt securities in definitive form will be issued in
exchange for the relevant registered global security. In addition, we may at any
time and in our sole discretion determine not to have any of the debt securities
of a series represented by one or more registered global securities and, in such
event, debt securities of such series in definitive form will be issued in
exchange for all of the registered global security or registered global
securities representing such debt securities. Any debt securities issued in
definitive form in exchange for a registered global security will be registered
in such name or names that the depositary gives to the trustee. We expect that
such instructions will be based upon directions received by the depositary from
participants with respect to ownership of beneficial interests in such
registered global security.

PAYMENT AND PAYING AGENTS

    Unless the applicable prospectus supplement indicates otherwise, payment of
interest on a debt security on any interest payment date will be made to the
person in whose name such debt security is registered at the close of business
on the regular record date for such interest payment.

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<PAGE>
    Unless the applicable prospectus supplement indicates otherwise, principal
of and any premium and interest on the debt securities will be payable at the
office of the paying agent designated by us. However, we may elect to pay
interest by check mailed to the address of the person entitled to such payment
at the address appearing in the security register. Unless otherwise indicated in
the applicable prospectus supplement, the corporate trust office of the Trustee
in the City of Cincinnati will be designated as our sole paying agent for
payments with respect to debt securities of each series. Any other paying agents
initially designated by us for the debt securities of a particular series will
be named in the applicable prospectus supplement. We may at any time designate
additional paying agents or rescind the designation of any paying agent or
approve a change in the office through which any paying agent acts, except that
we will be required to maintain a paying agent in each place of payment for the
debt securities of a particular series.

    All moneys paid by us to a paying agent for the payment of the principal of
or any premium or interest on any debt security which remain unclaimed at the
end of 18 months after such principal, premium or interest has become due and
payable will be repaid to us, and the holder of such debt security thereafter
may look only to us for payment.

CONSOLIDATION, MERGER, AND SALE OF ASSETS

    The Indenture does not contain any provision that restricts our ability to
merge or consolidate with or into any other corporation, sell or convey all or
substantially all of our assets to any person, firm or corporation or otherwise
engage in restructuring transactions, provided that the successor corporation
assumes due and punctual payment of principal or premium, if any, and interest
on the debt securities.

EVENTS OF DEFAULT

    Each of the following is defined as an event of default under the Indenture
with respect to debt securities of any series:

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

    - failure to pay any interest on any debt security of that series when due,
      continued for 30 days;

    - failure to deposit any sinking fund payment, when due, in respect of any
      debt security of that series;

    - failure to perform any other of our covenants in the Indenture (other than
      a covenant included in the Indenture solely for the benefit of a series
      other than that series), continued for 90 days after written notice has
      been given by the Trustee, or the holders of at least 35% in principal
      amount of the outstanding debt securities of that series, as provided in
      the Indenture; and

    - certain events of bankruptcy, insolvency or reorganization.

    If an event of default (other than a bankruptcy, insolvency or
reorganization event of default) with respect to the debt securities of any
series at the time outstanding shall occur and be continuing, either the Trustee
or the holders of at least 35% in aggregate principal amount of the outstanding
debt securities of that series by notice as provided in the Indenture may
declare the principal amount of the debt securities of that series to be due and
payable immediately. If a bankruptcy, insolvency or reorganization event of
default with respect to the debt securities of any series at the time
outstanding shall occur, the principal amount of all the debt securities of that
series will automatically, and without any action by the Trustee or any holder,
become immediately due and payable. After any such acceleration, but before a
judgment or decree based on acceleration, the holders of a majority in aggregate
principal amount of the outstanding debt securities of that series may, under
certain circumstances, rescind and annul such acceleration if all events of
default, other than the non-payment of accelerated principal, have been cured or
waived as provided in the Indenture. For information as to waiver of defaults,
see "Modification and Waiver."

    Subject to the provisions of the Indenture relating to the duties of the
Trustee in case an event of default shall occur and be continuing, the Trustee
will be under no obligation to exercise any of its rights or powers

                                       7
<PAGE>
under the Indenture at the request or direction of any of the holders, unless
such holders shall have offered to the Trustee reasonably satisfactory
indemnity. Subject to such provisions for the indemnification of the Trustee,
the holders of a majority in principal amount of the outstanding debt securities
of any series will have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Trustee, or exercising
any trust or power conferred on the Trustee, with respect to the debt securities
of that series.

    No holder of a debt security of any series will have any right to institute
any proceeding with respect to the Indenture, or for the appointment of a
receiver or a trustee, or for any other remedy thereunder, unless:

        (i) such holder has previously given to the Trustee written notice of a
    continuing event of default with respect to the debt securities of that
    series;

        (ii) the holders of at least 35% in aggregate principal amount of the
    outstanding debt securities of that series have made written request, and
    such holder or holders have offered reasonably satisfactory indemnity, to
    the Trustee to institute such proceeding as trustee; and

       (iii) the Trustee has failed to institute such proceeding, and has not
    received from the holders of a majority in aggregate principal amount of the
    outstanding debt securities of that series a direction inconsistent with
    such request, within 60 days after such notice, request and offer. However,
    such limitations do not apply to a suit instituted by a holder of a debt
    security for the enforcement of payment of the principal of or any premium
    or interest on such debt security on or after the applicable due date
    specified in such debt security.

    We will be required to furnish to the Trustee annually a statement by
certain of our officers as to whether or not we, to our knowledge, are in
default in the performance or observance of any of the terms, provisions and
conditions of the Indenture and, if so, specifying all such known defaults.

MODIFICATION AND WAIVER

    Modifications and amendments of the Indenture may be made by us and the
Trustee with the consent of the holders of not less than a majority in aggregate
principal amount of the outstanding debt securities of each series affected by
such modification or amendment; provided, however, that no such modification or
amendment may, without the consent of the holder of each outstanding debt
security affected thereby:

    - change the stated maturity of the principal of, or any installment of
      principal of or interest on, any debt security;

    - reduce the principal amount of, or any premium or interest on, any debt
      security;

    - reduce the amount of principal of an original issue discount security or
      any other debt security payable upon acceleration of the maturity thereof;

    - change the place or currency of payment of principal of, or any premium or
      interest on, any debt security;

    - affect the applicability of the subordination provisions to any debt
      security;

    - impair the right to institute suit for the enforcement of any payment on
      or with respect to any debt security; or

    - reduce the percentage in principal amount of outstanding debt securities
      of any series, the consent of whose holders is required for modification
      or amendment of the Indenture, reduce the percentage in principal amount
      of outstanding debt securities of any series necessary for waiver of
      compliance with certain provisions of the Indenture or for waiver of
      certain defaults or modify such provisions with respect to modification
      and waiver.

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    The holders of not less than a majority in aggregate principal amount of the
outstanding debt securities of any series may waive our compliance with certain
restrictive provisions of the Indenture. The holders of a majority in principal
amount of the outstanding debt securities of any series may waive any past
default under the Indenture, except a default in the payment of principal,
premium, or interest and certain covenants and provisions of the Indenture which
cannot be amended without the consent of the holder of each outstanding debt
security of such series affected.

    Except in certain limited circumstances, we will be entitled to set any day
as a record date for the purpose of determining the holders of outstanding debt
securities of any series entitled to give or take any direction, notice,
consent, waiver, or other action under the Indenture, in the manner and subject
to the limitations provided in the Indenture. In certain limited circumstances,
the Trustee will be entitled to set a record date for action by holders. If a
record date is set for any action to be taken by holders of a particular series,
such action may be taken only by persons who are holders of outstanding debt
securities of that series on the record date. To be effective, such action must
be taken by holders of the requisite principal amount of such debt securities
within a specified period following the record date. For any particular record
date, this period will be 180 days or such other shorter period as we may
specify (or the Trustee, if it set the record date), and may be shortened or
lengthened (but not beyond 180 days) from time to time.

DEFEASANCE AND COVENANT DEFEASANCE

    Under the Indenture, we may elect to have the provisions of the Indenture
relating to defeasance and discharge of indebtedness or the provisions relating
to defeasance of certain restrictive covenants applied with respect to the debt
securities of any series.

    DEFEASANCE AND DISCHARGE.  If we elect to have the provisions of the
Indenture relating to defeasance and discharge of indebtedness applied to any
debt securities, we will be discharged from all our obligations with respect to
such debt securities (except for certain obligations to exchange or register the
transfer of debt securities, to replace stolen, lost or mutilated debt
securities, to maintain paying agencies and to hold moneys for payment in trust)
upon the deposit in trust for the benefit of the holders of such debt securities
of money or U.S. Government Obligations, or both, which, through the payment of
principal and interest in respect thereof in accordance with their terms, will
provide money in an amount sufficient to pay the principal of and any premium
and interest on such debt securities on the respective stated maturities in
accordance with the terms of the Indenture and such debt securities. Such
defeasance or discharge may occur only if, among other things, we have delivered
to the Trustee an opinion of counsel to the effect that we have received from,
or there has been published by, the United States Internal Revenue Service a
ruling, or there has been a change in tax law, in either case to the effect that
holders of such debt securities will not recognize gain or loss for federal
income tax purposes as a result of such deposit, defeasance, and discharge and
will be subject to federal income tax on the same amount, in the same manner and
at the same times as would have been the case if such deposit, defeasance and
discharge were not to occur.

    DEFEASANCE OF CERTAIN COVENANTS.  If we elect to have the provisions of the
Indenture relating to defeasance of certain covenants applied to any debt
securities, we may omit to comply with certain restrictive covenants that may be
described in the applicable prospectus supplement, and the occurrence of certain
events of default, which are described above (with respect to such restrictive
covenants) under "events of default" and any that may be described in the
applicable prospectus supplement, will be deemed not to be or result in an event
of default, in each case with respect to such debt securities. In order to
exercise such option, we will be required to deposit, in trust for the benefit
of the holders of such debt securities, money or U.S. Government Obligations, or
both, which, through the payment of principal and interest in respect thereof in
accordance with their terms, will provide money in an amount sufficient to pay
the principal of and any premium and interest on such debt securities on the
respective stated maturities in accordance with the terms of the Indenture and
such debt securities. We will also be required, among other things, to deliver
to the Trustee an opinion of counsel to the effect that holders of such debt
securities will not recognize gain or

                                       9
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loss for federal income tax purposes as a result of such deposit and defeasance
of certain obligations and will be subject to federal income tax on the same
amount, in the same manner and at the same times as would have been the case if
such deposit and defeasance were not to occur. In the event that we exercised
this option with respect to any debt securities and such debt securities were
declared due and payable because of the occurrence of any event of default, the
amount of money and U.S. Government Obligations so deposited in trust would be
sufficient to pay amounts due on such debt securities at the time of their
respective stated maturities but may not be sufficient to pay amounts due on
such debt securities upon any acceleration resulting from such event of default.
In such case, we would remain liable for such payments.

TITLE

    PSI and the Trustee, and any agent of PSI or the Trustee may treat the
person in whose name a debt security is registered as the absolute owner thereof
(whether or not such debt security may be overdue) for the purpose of making
payment and for all other purposes.

GOVERNING LAW

    The Indenture and the debt securities will be governed by, and construed in
accordance with, the laws of the State of New York.

CONCERNING THE TRUSTEE

    Fifth Third Bank is the Trustee under the Indenture. Fifth Third Bank also
acts as Trustee for certain unsecured debt securities of our parent, Cinergy
Corp. and certain of our other affiliates, including The Cincinnati Gas &
Electric Company, The Union Light, Heat and Power Company, and Cinergy Global
Resources, Inc. Fifth Third Bank also acts as the Trustee for certain pollution
control revenue bonds of PSI and Cincinnati Gas & Electric, and acts as
registrar for the common stock of Cinergy and for the preferred stock of PSI and
Cincinnati Gas & Electric. Fifth Third Bank makes loans to, acts as depositary
for, and, in the normal course of business, also performs other services for
PSI, Cincinnati Gas & Electric and Union Light, Heat and Power.

                              PLAN OF DISTRIBUTION

    We may sell the debt securities directly to purchasers or indirectly through
underwriters, dealers or agents. The name of any such underwriters, dealers or
agents will be set forth in the relevant prospectus supplement. We will also set
forth in the relevant prospectus supplement:

    - the terms of the offering of the debt securities;

    - the proceeds we receive from such a sale;

    - any underwriting discounts and other items constituting underwriters'
      compensation;

    - any initial public offering price;

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

    - any securities exchanges on which we may list the debt securities.

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

    - a fixed price;

    - prices that may be changed;

    - market prices at the time of sale;

    - prices related to prevailing market prices; and

    - negotiated prices.

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<PAGE>
    We will describe the method of distribution in the relevant prospectus
supplement.

    If we use underwriters with respect to a series of debt securities, we will
set forth in the relevant prospectus supplement:

    - the name of the managing underwriter, if any;

    - the name of any other underwriters; and

    - the terms of the transaction, including any underwriting discounts and
      other items constituting compensation of the underwriters and dealers, if
      any.

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

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

    - entitle the underwriters to indemnification by us against certain civil
      liabilities under the Securities Act, or to contribution with respect to
      payments that the underwriters may be required to make related to any such
      civil liability;

    - subject the obligations of the underwriters to certain conditions
      precedent; and

    - obligate the underwriters to purchase all debt securities offered in a
      particular offering if any such debt securities are purchased.

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

    - overallot in connection with the offering, creating a syndicate short
      position;

    - bid for, and purchase, debt securities in the open market to cover
      syndicate short positions;

    - bid for, and purchase, debt securities in the open market to stabilize the
      price of the debt securities; and

    - reclaim selling concessions allowed for distributing the debt securities
      in the offering if the syndicate repurchases previously distributed debt
      securities in syndicate covering transactions, in stabilization
      transactions or otherwise.

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

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

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

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

                                       11
<PAGE>
    We may solicit offers to purchase debt securities and make sales directly to
institutional investors or others who may be considered underwriters under the
Securities Act with respect to such sales. We will describe the terms of any
such offer in the relevant prospectus supplement.

    If we authorize underwriters or other agents to solicit offers to purchase
debt securities from institutional investors pursuant to contracts providing for
payment and delivery at a future date, we will indicate that we are doing so in
the relevant prospectus supplement. We must approve all purchasers under such
contracts; the institutional investors may include commercial and savings banks,
insurance companies, pension funds, investment companies, educational and
charitable institutions and others. We will not subject the obligations of such
purchasers to any conditions except that:

    - we will not allow such purchases if they violate the laws of any
      jurisdiction to which a proposed purchaser is subject; and

    - if we are also selling the debt securities to underwriters, we will not
      sell to the underwriters subject to delayed delivery.

    Underwriters and other agents will not be responsible for the validity or
performance of such contracts providing for payment and delivery at a future
date.

    We will set forth in the relevant prospectus supplement the anticipated
delivery date of debt securities and the prospectus delivery obligations of
dealers.

                                 LEGAL MATTERS

    The validity of the debt securities will be passed upon for us by Taft,
Stettinius & Hollister LLP, Cincinnati, Ohio.

                                    EXPERTS

    The financial statements and schedule incorporated by reference in this
prospectus, have been audited by Arthur Andersen LLP, independent public
accountants, to the extent and for the periods indicated in their reports, and
are incorporated by reference in reliance upon the authority of such firm as
experts in accounting and auditing. Reference is made to said report, which
includes an explanatory paragraph with respect to the change in method of
accounting for energy trading and risk management activities effective
December 31, 1998, as discussed in Note 1 to the financial statements.

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