PSI ENERGY INC
424B2, 1998-03-17
ELECTRIC SERVICES
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<PAGE>
PROSPECTUS_ SUPPLEMENT
(TO PROSPECTUS DATED MARCH 16, 1998)
 
                                  $100,000,000
 
                                PSI ENERGY, INC.
 
               7.25% JUNIOR MATURING PRINCIPAL SECURITIES (JUMPS-SM-)
                                    DUE 2028
                                   ---------
 
    The 7.25% JUnior Maturing Principal Securities (JUMPS-SM-) Due 2028 (Offered
Debentures) will mature on March 15, 2028. Interest on the Offered Debentures is
payable semiannually on March 15 and September 15 commencing September 15, 1998.
The  Offered Debentures will be represented  by a global debenture registered in
the name of a nominee of The Depository Trust Company (Depositary), and will  be
available  for purchase  in denominations  of $1,000  and any  integral multiple
thereof. Beneficial interests in  the Offered Debentures will  be shown on,  and
transfers thereof will be effected through, records maintained by the Depositary
and  its  participants.  Except  as described  in  the  accompanying Prospectus,
Offered Debentures in  certificated form will  not be issued  in exchange for  a
global debenture. See "Certain Terms of the Offered Debentures" herein.
 
    Payment  of the principal of,  premium, if any, and  interest on the Offered
Debentures is subordinated and subject in right of payment to the prior  payment
in full of all Senior Debt of the Company. As of September 30, 1997, outstanding
Senior Debt of the Company aggregated approximately $1.22 billion.
                                 --------------
SEE "RISK FACTORS" ON PAGE S-3 HEREIN FOR CERTAIN INFORMATION RELEVANT TO AN
       INVESTMENT IN THE OFFERED DEBENTURES, INCLUDING THE PERIODS AND
        CIRCUMSTANCES DURING AND UNDER WHICH PAYMENT OF INTEREST ON
               THE OFFERED DEBENTURES MAY BE DEFERRED AND THE
                    RELATED FEDERAL INCOME TAX CONSEQUENCES.
                                 --------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
     EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
        SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
             COMMISSION PASSED UPON THE ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO THE
                      CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
                                                                            UNDERWRITING
                                                          PRICE TO         DISCOUNTS AND        PROCEEDS TO
                                                         PUBLIC (1)       COMMISSIONS (2)     COMPANY (1) (3)
<S>                                                  <C>                 <C>                 <C>
Per Offered Debenture                                     99.901%              1.000%             98.901%
Total                                                   $99,901,000          $1,000,000         $98,901,000
</TABLE>
 
   (1) Plus accrued interest from March 15, 1998 to the date of delivery.
 
   (2) The  Company  has agreed  to indemnify  the Underwriters  against certain
       liabilities, including liabilities under the  Securities Act of 1933,  as
       amended. See "Underwriting" herein.
 
   (3) Before  deduction  of  expenses  payable  by  the  Company,  estimated at
       $200,000.
 
                               ------------------
 
    The Offered Debentures are offered, subject  to prior sale, when, as and  if
issued  by the Company and accepted by the Underwriters, and subject to approval
of certain legal matters by Davis Polk & Wardwell, counsel for the Underwriters.
It is expected that delivery of the Offered Debentures will be made on or  about
March  19,  1998  through  the book-entry  facilities  of  The  Depository Trust
Company.
 
    Salomon Brothers Inc has filed an application with the United States  Patent
and Trademark Office for the registration of the "JUMPS-SM-" service mark.
                                 --------------
SALOMON SMITH BARNEY  FIRST CHICAGO CAPITAL MARKETS, INC.
 
The date of this Prospectus Supplement is March 16, 1998.
<PAGE>
    CERTAIN  PERSONS PARTICIPATING IN  THIS OFFERING MAY  ENGAGE IN TRANSACTIONS
THAT  STABILIZE,  MAINTAIN  OR  OTHERWISE  AFFECT  THE  PRICE  OF  THE   OFFERED
DEBENTURES.  SUCH TRANSACTIONS MAY INCLUDE  STABILIZING, THE PURCHASE OF OFFERED
DEBENTURES TO COVER SYNDICATE  SHORT POSITIONS AND THE  IMPOSITION OF A  PENALTY
BID. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE "UNDERWRITING."
 
                              SUMMARY INFORMATION
 
    THE  FOLLOWING MATERIAL IS QUALIFIED IN  ITS ENTIRETY BY THE INFORMATION AND
FINANCIAL STATEMENTS APPEARING ELSEWHERE IN THIS PROSPECTUS AND IN THE DOCUMENTS
AND INFORMATION INCORPORATED HEREIN BY REFERENCE.
 
                                  THE COMPANY
 
<TABLE>
<S>                                 <C>
Company...........................  PSI Energy, Inc.  an Indiana corporation  ("PSI" or  the
                                      "Company")  is  a wholly-owned  subsidiary  of Cinergy
                                      Corp., a registered holding  company under the  Public
                                      Utility Holding Company Act of 1935.
Business and Service Area.........  PSI  is  an  electric public  utility  company  with two
                                    wholly-owned non-utility subsidiaries. PSI is engaged in
                                      the production, transmission,  distribution, and  sale
                                      of  electric  energy  in  north  central,  central and
                                      southern Indiana. It serves an estimated population of
                                      2.1 million people  located in  69 of  the state's  92
                                      counties   including   the   cities   of  Bloomington,
                                      Columbus, Kokomo,  Lafayette,  New Albany,  and  Terre
                                      Haute.
Electric Generation Fuel..........  96% Coal and 4% Other.
</TABLE>
 
                          SELECTED INCOME INFORMATION
 
<TABLE>
<CAPTION>
                                               NINE MONTHS
                                                  ENDED                        12 MONTHS ENDED DECEMBER 31,
                                                SEPTEMBER    -----------------------------------------------------------------
                                                30, 1997        1996            1995           1994        1993        1992
                                               -----------   ----------    --------------   ----------  ----------  ----------
<S>                                            <C>           <C>           <C>              <C>         <C>         <C>
                                               (UNAUDITED)                      (THOUSANDS, EXCEPT RATIOS)
Operating Revenues...........................  $1,464,380    $1,331,962    $    1,248,035   $1,113,512  $1,092,222  $1,072,183
Operating Income.............................  $  155,615    $  205,762    $      226,889   $  152,186  $  165,214  $  168,445
Allowance for Borrowed and Equity Funds Used
  During Construction........................  $    1,272    $    2,324    $        4,385   $   13,585  $   20,327  $   10,505
Post-In-Service Carrying Costs...............  $   --        $    1,223    $        3,186   $    9,780  $    6,005  $   --
Net Income...................................  $   96,709    $  125,678    $      145,815   $   82,192  $  124,898  $  106,970
Preferred Dividend Requirement...............  $    8,964    $   12,537    $       13,180   $   13,182  $   12,825  $    7,286
                                               -----------   ----------    --------------   ----------  ----------  ----------
Net Income Applicable to Common Stock........  $   87,745    $  113,141    $      132,635   $   69,010  $  112,073  $   99,684
                                               -----------   ----------    --------------   ----------  ----------  ----------
                                               -----------   ----------    --------------   ----------  ----------  ----------
Ratio of Earnings to Fixed Charges...........        3.24          3.25              3.55         2.52        3.52        3.26
</TABLE>
 
                                 CAPITALIZATION
 
<TABLE>
<CAPTION>
                                                                                        OUTSTANDING
                                                                                    SEPTEMBER 30, 1997
                                                                               -----------------------------
                                                                                                  % OF
                                                                                  AMOUNT     CAPITALIZATION
                                                                               ------------  ---------------
                                                                                        (UNAUDITED)
                                                                               (THOUSANDS)
<S>                                                                            <C>           <C>
Long-term debt...............................................................   $  875,788           42.5%
Cumulative preferred stock
  Not subject to mandatory redemption........................................      157,209            7.6
Common stock equity..........................................................    1,029,932           49.9
                                                                               ------------         -----
    Total Capitalization.....................................................   $2,062,929          100.0%
                                                                               ------------         -----
                                                                               ------------         -----
</TABLE>
 
                                      S-2
<PAGE>
                                  RISK FACTORS
 
    Prospective  purchasers of  Offered Debentures  should carefully  review the
information contained elsewhere in this Prospectus Supplement and Prospectus and
should particularly consider the following matters:
 
SUBORDINATION
 
    Payment of the principal  of, premium, if any,  and interest on the  Offered
Debentures  is subordinated and subject in right of payment to the prior payment
in full of all Senior Debt (as defined in the Prospectus) of the Company.  There
are no terms in the Offered Debentures that limit the Company's ability to incur
additional indebtedness, including indebtedness that ranks senior to the Offered
Debentures.   A  description  of  subordination  with  respect  to  the  Offered
Debentures  is  further  discussed  under  "Description  of  Debt   Securities--
Subordination of Certain Debt Securities" in the accompanying Prospectus.
 
OPTION TO EXTEND INTEREST PAYMENT PERIOD
 
    The Company has the right under the Indenture to extend the interest payment
period  from time to time on the Offered Debentures to a period not exceeding 10
consecutive semiannual periods (so long as the period does not extend beyond the
maturity of the Offered Debentures),  and as a consequence, semiannual  interest
payments  on the  Offered Debentures  would be  deferred (but  would continue to
accrue with interest thereon compounded semiannually to the extent permitted  by
law)  during any such  extended interest payment  period. In the  event that the
Company exercises this right, the Company  may not declare or pay dividends  on,
or  purchase, acquire, or make a liquidation payment with respect to, any of its
capital stock, or  make any guarantee  payments with respect  to the  foregoing.
Therefore, the Company believes that the extension of an interest payment period
on  the Offered  Debentures is  unlikely. Prior to  the termination  of any such
extension period, the Company  may further extend  the interest payment  period,
provided that such extension period, together with all such previous and further
extensions  thereof, may not exceed 10  consecutive semiannual periods or extend
beyond the  maturity of  the Offered  Debentures. Upon  the termination  of  any
extension  period and the payment  of all accrued and  unpaid interest then due,
the  Company  may  select  a  new   extension  period,  subject  to  the   above
requirements.
 
    Should  the  Company  extend the  interest  payment period,  holders  of the
Offered Debentures (even if they used  the cash method of accounting for  United
States  federal income tax purposes) would be  required to accrue income (in the
form of original issue discount) for  United States federal income tax  purposes
even  though interest is  not being paid on  a current basis.  As a result, such
holders would be required  to include such interest  in gross income for  United
States  federal income tax purposes in advance of the receipt of cash, and would
not receive the cash  from the Company  related to such  income if such  holders
disposed  of their Offered  Debentures prior to  the record date  for payment of
interest. See "Certain United  States Federal Income Tax  Consequences--Interest
Income, Original Issue Discount, Market Discount and Acquisition Premium."
 
                                USE OF PROCEEDS
 
    The  net proceeds after underwriting discounts and commissions and estimated
expenses from the sale of the Offered Debentures are expected to be $98,701,000.
The Company will use the proceeds to repay short-term indebtedness (estimated to
be approximately $255 million at the time the proceeds are received) incurred in
connection with the redemption on March 1, 1998, of all 3,408,712 shares of  its
7.44% Cumulative Preferred Stock at a price of $25 per share.
 
                    CERTAIN TERMS OF THE OFFERED DEBENTURES
 
    The  following description of the particular terms of the Offered Debentures
supplements the description of the general  terms and provisions of the  Offered
Debentures   set  forth  in  the   accompanying  Prospectus  under  the  caption
"Description of Debt Securities."
 
                                      S-3
<PAGE>
GENERAL
 
    The Offered Debentures  will be unsecured,  subordinated obligations of  the
Company.  There are no  terms in the  Offered Debentures or  the Indenture under
which they  are issued  that limit  the Company's  ability to  incur  additional
indebtedness,   including  indebtedness   that  ranks  senior   to  the  Offered
Debentures.
 
    The Indenture does not contain any provisions that afford holders of Offered
Debentures protection in the event  of a highly leveraged transaction  involving
the Company.
 
PRINCIPAL AMOUNT, INTEREST AND MATURITY
 
    The  Offered  Debentures will  be  issued under  the  Indenture dated  as of
November 15, 1996 between PSI and The Fifth Third Bank, Trustee, as proposed  to
be supplemented by a Third Supplemental Indenture dated as of March 15, 1998.
 
    The  Offered Debentures will be designated as specified on the cover of this
Prospectus Supplement and will be limited  to a total of $100,000,000  aggregate
principal amount.
 
    The Offered Debentures will mature on March 15, 2028, and will bear interest
at  the rate  per annum  specified in their  title, computed  on the  basis of a
360-day year of  twelve 30-day  months, from  March 15,  1998 or  from the  most
recent  interest payment date to  which interest has been  paid or provided for,
payable semiannually  on March  15  and September  15  in each  year,  beginning
September  15,  1998,  to  registered  holders of  record  on  the  Business Day
immediately preceding such interest  payment date. A  "Business Day" shall  mean
any  day other than a day on which  banking institutions in The City of New York
are authorized or obligated to close.
 
    Principal of  and  interest on  the  Offered Debentures  will  initially  be
payable  and the Offered 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, provided that payment of interest may be made, at
the  option of the  Company, by checks  mailed to the  registered holders of the
Offered Debentures.
 
    The Company  has the  right to  extend the  interest payment  period on  the
Offered Debentures under certain circumstances. See "Risk Factors" herein.
 
REDEMPTION
 
    Subject  to the terms of the Indenture,  the Company shall have the right to
redeem the Offered Debentures, in whole but  not in part, from time to time  and
at  any time (such  redemption, an "Optional Redemption",  and the date thereof,
the "Optional  Redemption Date"),  upon not  less than  30 days'  notice to  the
holders,  at a redemption price equal to the  sum of (A) the greater of (i) 100%
of the principal amount of the Offered Debentures to be redeemed or (ii) the sum
of the present values of the Remaining Scheduled Payments thereon discounted  to
the  Optional Redemption  Date on  a semiannual  basis (assuming  a 360-day year
consisting of twelve 30-day months) at  the Treasury Rate plus 20 basis  points,
less  the Applicable  Accrued Interest  Amount plus  (B) the  Applicable Accrued
Interest Amount.
 
    "Applicable Accrued Interest Amount" means, at the Optional Redemption Date,
the amount of interest accrued and  unpaid from the prior interest payment  date
to  the  Optional  Redemption Date  on  the  Offered Debentures  subject  to the
Optional Redemption determined at the rate per annum shown in the title thereof,
computed on the basis of a 360-day year of twelve 30-day months.
 
    "Comparable Treasury  Issue"  means  the  United  States  Treasury  security
selected  by an Independent Investment Banker as having a maturity 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 Offered Debentures to be redeemed pursuant
to the Optional  Redemption. "Independent  Investment Banker" means  one of  the
Reference  Treasury Dealers appointed by the Trustee after consultation with the
Company.
 
                                      S-4
<PAGE>
    "Comparable Treasury Price" means, with  respect to the Optional  Redemption
Date,  the average of the Reference Treasury Dealer Quotations for such Optional
Redemption Date.
 
    "Reference Treasury  Dealer"  means  each of  Salomon  Brothers  Inc,  First
Chicago  Capital  Markets,  Inc.,  and  their  respective  successors; provided,
however, that  if  any  of the  foregoing  shall  cease to  be  a  primary  U.S.
Government  securities dealer in New York City (a "Primary Treasury Dealer") the
Company will  substitute therefor  another Primary  Treasury Dealer.  "Reference
Treasury  Dealer  Quotations" means,  with  respect to  each  Reference Treasury
Dealer and any redemption  date, 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.  on the  third  Business Day
preceding such redemption date.
 
    "Remaining Scheduled Payments" means, with respect to any Offered Debenture,
the remaining scheduled  payments of the  principal thereof to  be redeemed  and
interest  thereon that would be  due after the Optional  Redemption Date but for
the Optional Redemption.
 
    "Treasury Rate"  means, with  respect to  the Optional  Redemption Date  (if
any), the rate per annum equal to the semiannual equivalent yield to maturity of
the  Comparable Treasury  Issue, assuming  a price  for the  Comparable Treasury
Issue (expressed  as  a  percentage  of  its  principal  amount)  equal  to  the
Comparable Treasury Price for such Optional Redemption Date.
 
    The  Offered 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
 
    The Offered  Debentures  will  be  represented  by  a  Global  Debenture  or
Debentures  that will be deposited  with, or on behalf  of, The Depository Trust
Company, New York, New York, as  Depositary (Depositary), and will be  available
for purchase in denominations of $1,000 or any integral multiple thereof.
 
    The  Depositary has advised the Company and the Underwriters as follows: the
Depositary is  a limited-purpose  trust  company organized  under the  New  York
Banking Law, a "banking organization" within the meaning of the New York Banking
Law, a member of the Federal Reserve System, a "clearing corporation" within the
meaning  of  the  New York  Uniform  Commercial  Code, and  a  "clearing agency"
registered pursuant to the provisions of Section 17A of the Securities  Exchange
Act  of 1934. The Depositary was created to hold securities of its participating
organizations (participants) and to facilitate  the clearance and settlement  of
securities  transactions, such as transfers  and pledges, among its participants
in  such  securities  through  electronic  computerized  book-entry  changes  in
accounts of the participants, thereby eliminating the need for physical movement
of  securities certificates. Participants include securities brokers and dealers
(including the Underwriters), banks, trust companies, clearing corporations  and
certain other organizations, some of whom (and/or their representatives) own the
Depositary.  Access to the  Depositary's book entry system  is also available to
others, such as banks, brokers, dealers  and trust companies that clear  through
or  maintain a  custodial relationship  with a  participant, either  directly or
indirectly. Persons who  are not  participants may  beneficially own  securities
held by the Depositary only through participants.
 
    A  further description  of the Depositary's  procedures with  respect to the
Offered Debentures is  set forth under  "Description of Debt  Securities--Global
Debt Securities" in the accompanying Prospectus.
 
DEFEASANCE
 
    The Offered Debentures will be subject to defeasance and covenant defeasance
as  provided  under  "Description of  Debt  Securities--Defeasance  and Covenant
Defeasance" in the accompanying Prospectus.
 
                                      S-5
<PAGE>
             CERTAIN UNITED STATES FEDERAL INCOME TAX CONSEQUENCES
 
    The  following summary  describes certain  United States  federal income tax
consequences of the ownership  of Offered Debentures as  of the date hereof  and
represents  the  opinion of  Taft, Stettinius  & Hollister  LLP, counsel  to the
Company, insofar as it  relates to matters of  law or legal conclusions.  Except
where  noted, such  summary deals only  with Offered Debentures  held by initial
purchasers who have purchased Offered  Debentures at the initial offering  price
thereof and who hold such Offered Debentures as capital assets and does not deal
with  special situations, such as those  of dealers in securities or currencies,
financial  institutions,  life  insurance  companies,  persons  holding  Offered
Debentures  as a  part of  a hedging  or conversion  transaction or  a straddle,
United States Holders (as defined below) whose "functional currency" is not  the
U.S.  dollar, or Non-United States Holders  (as defined below) who own (actually
or constructively)  ten percent  or more  of the  combined voting  power of  all
classes  of voting stock  of the Company, who  are presently in  or engaged in a
business in the United States or who have any other special status with  respect
to  the  United States.  Furthermore,  the discussion  below  is based  upon the
provisions of  the  Internal  Revenue  Code  of  1986,  as  amended  (Code)  and
regulations,  rulings and judicial  decisions thereunder as  of the date hereof,
and such authorities may  be repealed, revoked  or modified so  as to result  in
federal  income tax consequences  different from those  discussed below. PERSONS
CONSIDERING THE PURCHASE, OWNERSHIP OR DISPOSITION OF OFFERED DEBENTURES  SHOULD
CONSULT THEIR OWN TAX ADVISORS CONCERNING THE FEDERAL INCOME TAX CONSEQUENCES IN
LIGHT  OF THEIR PARTICULAR SITUATIONS AS  WELL AS ANY CONSEQUENCES ARISING UNDER
THE LAWS OF ANY OTHER TAXING JURISDICTION.
 
UNITED STATES HOLDERS
 
    As used herein,  a "United States  Holder" of an  Offered Debenture means  a
holder  that is  a citizen or  resident of  the United States  for United States
federal income tax purposes, a corporation, partnership or other entity  created
or  organized  in  or under  the  laws of  the  United States  or  any political
subdivision thereof, or an  estate or trust  the income of  which is subject  to
United  States federal income  taxation regardless of  its source. A "Non-United
States Holder" is a holder that is not a United States Holder.
 
INTEREST INCOME, ORIGINAL ISSUE DISCOUNT, MARKET DISCOUNT AND ACQUISITION
  PREMIUM
 
    Treasury regulations (Regulations) generally provide that stated interest on
a debt instrument issued on or after  August 13, 1996, is not "qualified  stated
interest" and, therefore, will give rise to original issue discount (OID) unless
such interest is unconditionally payable in cash or in property (other than debt
instruments of the issuer) at least annually at a single fixed rate. Interest is
considered to be unconditionally payable only if reasonable legal remedies exist
to  compel timely  payment or the  debt instrument otherwise  provides terms and
conditions that make  the likelihood of  late payment (other  than late  payment
that  occurs  within  a  reasonable  grace  period)  or  non-payment  a  "remote
contingency". Because  of the  remedies  available to  the Trustee  and  Holders
discussed herein (see "Events of Default"), the Company believes that the stated
interest  on the Offered Debentures should be considered unconditionally payable
for purposes of the Regulations.
 
    The Regulations  also  generally provide  that  stated interest  on  a  debt
instrument  issued on or after August 13,  1996 that provides the issuer with an
option to defer  any interest payment  is not "qualified  stated interest"  and,
therefore, would give rise to OID to the extent such stated interest exceeds the
amount  of interest  paid during  the deferral period,  if the  exercise of such
right to defer is likely to occur. The Company has the right under the terms  of
the  Offered Debentures to  defer any interest  payment from time  to time for a
period not exceeding 10 consecutive semiannual interest payment periods.  During
any  such extension period the terms of  the Offered Debentures provide that the
Company shall not declare or pay any dividend on or purchase, acquire or make  a
liquidation  payment with  respect to,  any of  its capital  stock, or  make any
guarantee payments with respect to  the foregoing. See "Risk Factors--Option  to
Extend Interest Payment Period". The Company currently believes that the adverse
impact  that the imposition of such restrictions would have on the Company makes
the likelihood of its exercising its right to defer remote.
 
                                      S-6
<PAGE>
    The Company believes that the remedies available to the Trustee and  Holders
upon  an Event  of Default  and the  right to  defer will  not cause  the stated
interest to  fail  to  be  "qualified  stated  interest"  for  purposes  of  the
Regulations.  Consequently,  the Company  believes  that the  Offered Debentures
should not be considered  to be issued  with OID at the  time of their  original
issuance.  Accordingly, a  holder of  the Offered  Debentures should  include in
gross income the  interest on  the Offered  Debentures in  accordance with  such
holder's  regular method of tax accounting.  There can be no assurance, however,
that the Internal Revenue Service (IRS)  will agree with the Company's  position
with regard to the existence of OID.
 
    United States Holders other than initial United States Holders may be deemed
to  have acquired  the Offered  Debentures with  market discount  or acquisition
premium. Such  holders should  consult  their own  tax advisors  concerning  the
effect  of the market discount and premium rules on their holding of the Offered
Debentures.
 
SALE, EXCHANGE AND RETIREMENT OF OFFERED DEBENTURES
 
    Upon the sale,  exchange or  retirement of  an Offered  Debenture, a  United
States  Holder will recognize gain  or loss equal to  the difference between the
amount realized upon the sale, exchange or retirement (other than in respect  of
accrued  interest, which, unless  the Offered Debentures  are considered to have
been issued with OID, will be taxed as  such) and the adjusted tax basis of  the
Offered  Debenture. A  United States Holder's  adjusted tax basis  in an Offered
Debenture will,  in  general,  be  the United  States  Holder's  cost  therefor,
increased by the amount of OID, if any, previously included in income. Such gain
or  loss will be capital gain or loss and will be long-term capital gain or loss
if at the time of  sale, exchange or retirement  the Offered Debenture has  been
held for more than one year. Under current law, net capital gains of individuals
are,  under certain circumstances,  taxed at lower rates  than items of ordinary
income. The deductibility of capital losses is subject to limitations.
 
NON-UNITED STATES HOLDERS
 
    Under present United States federal income  and estate tax law, and  subject
to the discussion below concerning backup withholding:
 
        (a)  no withholding of United States federal income tax will be required
    with respect to the payment by the Company or any Paying Agent of  principal
    or  interest on  an Offered Debenture  owned by a  Non-United States Holder,
    provided (i) the beneficial  owner is not  a controlled foreign  corporation
    that  is related to the Company through stock ownership, (ii) the beneficial
    owner is not a  bank whose receipt  of interest on  an Offered Debenture  is
    described  in  section 881(c)(3)(A)  of the  Code and  (iii) either  (y) the
    beneficial owner timely  certifies to the  Company or its  agent, under  the
    penalties  of perjury, that it is not a U.S. person, citizen or resident and
    provides its name  and address  or (z)  a financial  institution that  holds
    customer  securities  in the  ordinary course  of  business and  holding the
    Offered Debentures on behalf of the beneficial owner timely certifies, under
    penalties of  perjury, that  such  statement has  been  received by  it  and
    furnishes the Company or its agent with a copy thereof;
 
        (b)  no withholding of United States federal income tax will be required
    with respect to any  gain or income realized  by a Non-United States  Holder
    upon the sale, exchange or retirement of an Offered Debenture; and
 
        (c)  an Offered Debenture beneficially owned by an individual who at the
    time of death is a  Non-United States Holder will  not be subject to  United
    States  federal estate tax as a  result of such individual's death, provided
    that the interest  payments with respect  to such debenture  would not  have
    been,  if  received  at the  time  of such  individual's  death, effectively
    connected with the conduct of a trade or business by such individual in  the
    United States.
 
BACKUP WITHHOLDING AND INFORMATION REPORTING
 
    In  general,  information  reporting  requirements  will  apply  to  certain
payments of  principal  and interest  paid  on  Offered Debentures  and  to  the
proceeds   of   sale   of   an  Offered   Debenture   made   to   United  States
 
                                      S-7
<PAGE>
Holders other  than  certain exempt  recipients  (such as  corporations).  A  31
percent  backup withholding tax will apply to such payments if the United States
Holder  fails  to   provide  a   correct  taxpayer   identification  number   or
certification  of exempt status or fails to report in full dividend and interest
income.
 
    No information reporting or backup withholding will be required with respect
to payments made by the Company or any paying agent to Non-United States Holders
if a statement described in (a)(iii) under "Non-United States Holders" has  been
received timely and the payor does not have actual knowledge that the beneficial
owner is a United States person.
 
    For payments occurring before January 1, 1999, payments of the proceeds from
the  sale  by a  Non-United States  Holder of  an Offered  Debenture made  to or
through a  foreign  office  of a  broker  will  not be  subject  to  information
reporting  or  backup withholding,  except that  if the  broker is,  for federal
income tax purposes, a United States person, a controlled foreign corporation or
a foreign person that derives 50 percent or more of its gross income for certain
periods from the  conduct of  a trade  or business  in the  United States,  such
payments  will  not be  subject to  backup  withholding but  will be  subject to
information reporting unless  certain requirements are  satisfied. For  payments
occurring  after December 31, 1998, payments of  the proceeds from the sale by a
Non-United States Holder  of an Offered  Debenture made through  a broker at  an
office outside the United States will not be subject to information reporting or
backup  withholding if  the broker  is not  (i) a  United States  person, (ii) a
foreign corporation if more than 50  percent of the total combined voting  power
of  all classes of stock of such corporation entitled to vote or the total value
of the stock of such  corporation is owned or is  considered as owned by  United
States  shareholders  on  any  day  during  the  taxable  year  of  such foreign
corporation, (iii) a foreign  partnership, if at any  time during its tax  year,
one  or more of  its partners are  United States persons  who, in the aggregate,
hold more than 50 percent of the  income or capital interest in the  partnership
or  if, at any time during its tax year, it is engaged in the conduct of a trade
or business in the United  States, (iv) a foreign person  50 percent or more  of
the  gross income of  which, from all  sources for the  three-year period ending
with the close of its taxable year preceding the collection or payment (or  such
part  of  such period  as the  person  has been  in existence),  was effectively
connected with the conduct of trade or business within the United States, or (v)
a United States branch of a foreign bank or a foreign insurance company.
 
    Payments of proceeds from the sale of an Offered Debenture to or through the
United States office of a broker is subject to information reporting and  backup
withholding  unless  the  Non-United  States  Holder  or  the  beneficial  owner
certifies as  to  its  non-United  States status  or  otherwise  establishes  an
exemption.
 
    Any amounts withheld under the backup withholding rules will be allowed as a
refund  or  a credit  against  such holder's  United  States federal  income tax
liability provided the required information is furnished to the IRS.
 
                                  UNDERWRITING
 
    Under  the  terms  of  and  subject  to  the  conditions  contained  in   an
Underwriting  Agreement dated March 16, 1998,  the Underwriters named below have
agreed to purchase, and the Company has  agreed to sell to them, severally,  the
respective principal amounts of the Offered Debentures set forth below:
 
<TABLE>
<CAPTION>
                                                                                       PRINCIPAL AMOUNT
                                                                                          OF OFFERED
             UNDERWRITERS                                                                 DEBENTURES
- ------------------------------------------------------------------------------------  ------------------
<S>                                                                                   <C>
 
Salomon Brothers Inc................................................................    $   50,000,000
First Chicago Capital Markets, Inc..................................................        50,000,000
                                                                                      ------------------
          Total.....................................................................    $  100,000,000
                                                                                      ------------------
                                                                                      ------------------
</TABLE>
 
    The Underwriting Agreement provides that the obligations of the Underwriters
to  pay for  and accept delivery  of the  Offered Debentures are  subject to the
approval of  certain  legal  matters  by their  counsel  and  to  certain  other
conditions.  The  Underwriters are  committed to  take  and pay  for all  of the
Offered Debentures if any are taken.
 
                                      S-8
<PAGE>
    The Underwriters initially propose to  offer part of the Offered  Debentures
directly  to the public at the public offering price set forth on the cover page
hereof and part to dealers at a  price which represents a concession of .60%  of
the principal amount under the public offering price, and either Underwriter may
allow,  and such dealers may reallow, a concession  not in excess of .25% of the
principal amount to  certain other dealers.  All sales to  dealers will be  made
pursuant  to  dealer  agreements.  After the  initial  offering  of  the Offered
Debentures, the offering price and other  selling terms may, from time to  time,
be varied by the Underwriters.
 
    Until  the distribution of the Offered Debentures is completed, rules of the
Securities and Exchange Commission may limit the ability of the Underwriters and
certain selling group members to bid for and purchase the Offered Debentures. As
an exception to these rules, the Underwriters are permitted to engage in certain
transactions  that  stabilize  the  price   of  the  Offered  Debentures.   Such
transactions  consist of bids or purchases for the purpose of pegging, fixing or
maintaining the price of the Offered Debentures.
 
    If the Underwriters  create a short  position in the  Offered Debentures  in
connection  with the  offering by selling  more Offered Debentures  than are set
forth on the  cover page  of this  Prospectus Supplement,  the Underwriters  may
reduce that short position by purchasing Offered Debentures in the open market.
 
    The  Underwriters may also  impose a penalty bid  on certain broker dealers.
This means that  if the  Underwriters purchase  Offered Debentures  in the  open
market  to reduce the Underwriters' short position  or to stabilize the price of
the Offered Debentures, they  may reclaim the amount  of the selling  concession
from  the  broker dealers  who  sold those  Offered  Debentures as  part  of the
offering.
 
    In general, purchases of a security  for the purpose of stabilization or  to
reduce  a short position could cause the price of the security to be higher than
it might be in the  absence of such purchases. The  imposition of a penalty  bid
might  also have an effect on the price of a security to the extent that it were
to discourage resales of the security.
 
    Neither PSI  nor either  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 Offered Debentures. In  addition,
neither  PSI nor  either of the  Underwriters makes any  representation that the
Underwriters will engage in  such transactions or  that such transactions,  once
commenced, will not be discontinued without notice.
 
    The  Underwriters, and  certain affiliates  thereof, engage  in transactions
with and perform  services for the  Company and its  affiliates in the  ordinary
course of business.
 
    The  Company  has  agreed  to  indemnify  the  Underwriters  against certain
liabilities, including certain liabilities under the Securities Act of 1933.
 
                                 LEGAL OPINION
 
    Statements as to United States  taxation in the Prospectus Supplement  under
the  caption, "Certain United States Federal  Income Tax Consequences" have been
passed upon for the Company by Taft, Stettinius & Hollister LLP, counsel to  the
Company, and are stated herein on their authority.
 
                                      S-9
<PAGE>
PROSPECTUS
 
                                PSI ENERGY, INC.
                                DEBT SECURITIES
 
                               -----------------
 
  PSI ENERGY, INC. (PSI) INTENDS FROM TIME TO TIME TO ISSUE UP TO $250,000,000
  AGGREGATE PRINCIPAL AMOUNT OF UNSECURED DEBT SECURITIES (DEBT SECURITIES) IN
  ONE OR MORE SERIES ON TERMS TO BE DETERMINED AT THE TIME OR TIMES OF SALE.
   FOR EACH ISSUE OF THE DEBT SECURITIES FOR WHICH THIS PROSPECTUS IS BEING
    DELIVERED (OFFERED SECURITIES) THERE WILL BE AN ACCOMPANYING PROSPECTUS
     SUPPLEMENT (PROSPECTUS SUPPLEMENT) THAT SETS FORTH, WITHOUT LIMITATION
       AND TO THE EXTENT APPLICABLE, THE SPECIFIC DESIGNATION, AGGREGATE
      PRINCIPAL AMOUNT, DENOMINATION, MATURITY, PREMIUM, IF ANY, RATE OF
       INTEREST (WHICH MAY BE FIXED OR VARIABLE) OR METHOD OF CALCULATION
      THEREOF, TIME OF PAYMENT OF INTEREST, ANY TERMS FOR REDEMPTION, ANY
      SINKING FUND PROVISIONS, ANY SUBORDINATION PROVISIONS, THE INITIAL
      PUBLIC OFFERING PRICE, THE NAMES OF ANY UNDERWRITERS OR AGENTS, THE
        PRINCIPAL AMOUNTS, IF ANY, TO BE PURCHASED BY THE UNDERWRITERS,
         THE COMPENSATION OF SUCH UNDERWRITERS OR AGENTS, AND ANY OTHER
                    SPECIAL TERMS OF THE OFFERED SECURITIES.
 
                              -------------------
 
 THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
      EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
    SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
           REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                              -------------------
 
    PSI MAY SELL THE DEBT SECURITIES THROUGH UNDERWRITERS, DEALERS OR AGENTS, OR
DIRECTLY TO ONE OR A LIMITED NUMBER OF PURCHASERS. THE PROSPECTUS SUPPLEMENT
WILL SET FORTH THE NAMES OF UNDERWRITERS, DEALERS OR AGENTS, IF ANY, ANY
APPLICABLE COMMISSIONS OR DISCOUNTS AND THE NET PROCEEDS TO PSI FROM THE SALE OF
THE OFFERED SECURITIES.
 
MARCH 16, 1998
<PAGE>
                             AVAILABLE INFORMATION
 
    PSI IS SUBJECT TO THE INFORMATIONAL REQUIREMENTS OF THE SECURITIES EXCHANGE
ACT OF 1934 (EXCHANGE ACT) AND ACCORDINGLY FILES REPORTS AND OTHER INFORMATION
WITH THE SECURITIES AND EXCHANGE COMMISSION (COMMISSION). INFORMATION CONCERNING
DIRECTORS AND OFFICERS, THEIR REMUNERATION, AND ANY MATERIAL INTEREST OF SUCH
PERSONS IN TRANSACTIONS WITH PSI, AS OF PARTICULAR DATES, IS DISCLOSED IN PSI'S
ANNUAL REPORT ON FORM 10-K FILED WITH THE COMMISSION. SUCH REPORTS AND OTHER
INFORMATION CAN BE INSPECTED AND COPIED AT THE PUBLIC REFERENCE FACILITIES
MAINTAINED BY THE COMMISSION AT ROOM 1024, 450 FIFTH STREET, N.W., WASHINGTON,
D.C.; SUITE 1400, 500 WEST MADISON STREET, CHICAGO, ILLINOIS; AND SUITE 1300,
SEVEN WORLD TRADE CENTER, NEW YORK, N.Y. COPIES OF SUCH MATERIAL CAN ALSO BE
OBTAINED FROM THE PUBLIC REFERENCE SECTION OF THE COMMISSION AT ITS PRINCIPAL
OFFICE AT 450 FIFTH STREET, N.W., WASHINGTON, D.C. 20549, AT PRESCRIBED RATES,
OR FROM THE COMMISSION'S INTERNET WEB SITE AT HTTP://WWW.SEC.GOV. IN ADDITION,
SUCH MATERIAL CAN ALSO BE INSPECTED AT THE OFFICE OF THE NEW YORK STOCK
EXCHANGE.
 
    PSI'S PRINCIPAL EXECUTIVE OFFICE IS LOCATED AT 1000 EAST MAIN STREET,
PLAINFIELD, INDIANA 46168 (TELEPHONE 317-839-9611).
                              -------------------
 
    NO DEALER, SALESMAN, OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS
PROSPECTUS IN CONNECTION WITH THE OFFER CONTAINED IN THIS PROSPECTUS, AND, IF
GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY PSI OR ANY UNDERWRITER. THIS PROSPECTUS DOES NOT
CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY OF THE
SECURITIES OFFERED HEREBY IN ANY STATE TO ANY PERSON TO WHOM IT IS UNLAWFUL TO
MAKE SUCH OFFER OR SOLICITATION IN SUCH STATE. THE DELIVERY OF THIS PROSPECTUS
AT ANY TIME DOES NOT IMPLY THAT THE INFORMATION HEREIN IS CORRECT AS OF ANY TIME
SUBSEQUENT TO THE DATE HEREOF.
 
                              -------------------
 
                 INCORPORATION OF CERTAIN DOCUMENT BY REFERENCE
 
    There is hereby incorporated in this Prospectus by reference the following
documents heretofore filed with the Securities and Exchange Commission:
 
        1.  PSI's Annual Report on Form 10-K for the year ended December 31,
    1996 filed pursuant to the Exchange Act.
 
        2.  PSI's Quarterly Reports on Form 10-Q for the quarters ended March
    31, 1997, June 30, 1997 and September 30, 1997 filed pursuant to the
    Exchange Act.
 
    All documents filed by PSI pursuant to Section 13(a), 13(c), 14 or 15(d) of
the Exchange Act after the date of this Prospectus and prior to the termination
of this offering shall be deemed to be incorporated in this Prospectus by
reference and to be a part hereof from the date of filing of such documents.
 
    Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document which is deemed to be incorporated
by reference herein or in the Prospectus Supplement modifies or supersedes such
statement. Any such statement so modified or superseded shall not be deemed,
except as so modified or superseded, to constitute a part of this Prospectus.
 
    PSI HEREBY UNDERTAKES TO PROVIDE WITHOUT CHARGE TO EACH PERSON TO WHOM A
COPY OF THIS PROSPECTUS HAS BEEN DELIVERED, ON THE WRITTEN OR ORAL REQUEST OF
ANY SUCH PERSON, A COPY OF ANY OR ALL OF THE DOCUMENTS REFERRED TO ABOVE WHICH
HAVE BEEN OR MAY BE INCORPORATED IN THIS PROSPECTUS BY REFERENCE, OTHER THAN
EXHIBITS TO SUCH DOCUMENTS. REQUESTS FOR SUCH COPIES SHOULD BE DIRECTED TO MR.
WILLIAM L. SHEAFER, VICE PRESIDENT AND TREASURER, PSI ENERGY, INC., 139 EAST
FOURTH STREET, CINCINNATI, OHIO 45202 (TELEPHONE 513-421-9500).
 
                                       2
<PAGE>
                                  THE COMPANY
 
    PSI (incorporated in Indiana) is a wholly-owned subsidiary of Cinergy Corp.
(Cinergy), a registered holding company under the Public Utility Holding Company
Act of 1935. PSI is an electric public utility company with two wholly-owned
non-utility subsidiaries. PSI is engaged in the production, transmission,
distribution, and sale of electric energy in north central, central and southern
Indiana. It serves an estimated population of two million people located in 69
of the state's 92 counties including the cities of Bloomington, Columbus,
Kokomo, Lafayette, New Albany, and Terre Haute.
 
                                USE OF PROCEEDS
 
    Except as otherwise described in the Prospectus Supplement, the net proceeds
of the Offered Securities will be applied primarily to the redemption,
repurchase, repayment, or retirement of outstanding indebtedness and preferred
stock.
 
                       RATIO OF EARNINGS TO FIXED CHARGES
 
    The ratio of earnings to fixed charges for each of the years ended December
31, 1992 through 1996 and the nine months ended September 30, 1997 were 3.26,
3.52, 2.52, 3.55, 3.25 and 3.24, respectively.
 
                         DESCRIPTION OF DEBT SECURITIES
 
GENERAL
 
    The Debt Securities may be issued in one or more new series under an
Indenture between the Company and The Fifth Third Bank, as Trustee (Trustee).
The following summary does not purport to be complete and is subject in all
respects to the provisions of, and is qualified in its entirety by reference to,
the Indenture and the Debt Securities, the forms of which are filed as exhibits
to the registration statement of which this Prospectus forms a part. Whenever
particular provisions or defined terms in such documents are referred to herein
or in a Prospectus Supplement, such provisions or terms are incorporated by
reference herein or therein, as the case may be.
 
    The Debt Securities will be unsecured obligations of the Company.
 
    Reference is made to the Prospectus Supplement relating to any particular
issue of Offered Securities for the following terms, among others: (1) the title
of such Debt Securities; (2) any limit on the aggregate principal amount of such
Debt Securities or the series of which they are a part; (3) the date or dates on
which the principal of any of such Debt Securities will be payable; (4) the rate
or rates at which any of such Debt Securities will bear interest, if any, the
date or dates from which any such interest will accrue, the Interest Payment
Dates on which any such interest will be payable and the Regular Record Date for
any such interest payable on any Interest Payment Date; (5) the right, if any,
to extend interest payment periods and the duration of such extension; (6) the
place or places where the principal of and any premium and interest on any of
such Debt Securities will be payable; (7) the period or periods within which,
the price or prices at which and the terms and conditions on which any of such
Debt Securities may be redeemed, in whole or in part, at the option of the
Company; (8) the obligation, if any, of the Company to redeem or purchase any of
such Debt Securities pursuant to any sinking fund or analogous provision or at
the option of the Holder thereof, and the period or periods within which, the
price or prices at which and the terms and conditions on which any of such Debt
Securities will be redeemed or purchased, in whole or in part, pursuant to any
such obligation; (9) the denominations in which any of such Debt Securities will
be issuable; (10) if the amount of principal of or any premium or interest on
any of such Debt Securities may be determined with reference to an index or
pursuant to a formula, the manner in which such amounts will be determined; (11)
if applicable, that such Debt Securities, in whole or any specified part, are
defeasible pursuant to the provisions of the Indenture described under
"Defeasance and Covenant Defeasance"; (12) whether any of such Debt Securities
will be issuable in whole or in part in the form of one or more Global Debt
Securities and, if so, the respective Depositaries for such Global Debt
Securities, the form of any legend or legends to be borne by any such Global
Debt Security in addition to or in lieu of the legend
 
                                       3
<PAGE>
referred to under "Form, Exchange and Transfer--Global Debt Securities" and, if
different from those described under such caption, any circumstances under which
any such Global Debt Security may be exchanged in whole or in part for Debt
Securities registered, and any transfer of such Global Debt Security in whole or
in part may be registered, in the names of Persons other than the Depositary for
such Global Debt Security or its nominee; (13) any addition to or change in the
Events of Default applicable to any of such Debt Securities and any change in
the right of the Trustee or the Holders to declare the principal amount of any
of such Debt Securities due and payable; (14) any addition to or change in the
covenants in the Indenture; (15) the applicability of or any change in the
subordination provisions of the Indenture for a series of Debt Securities; and
(16) any other terms of such Debt Securities not inconsistent with the
provisions of the Indenture. (Section 301).
 
    Except as otherwise described in the Prospectus Supplement, the covenants
contained in the Indenture would not afford holders of Debt Securities
protection in the event of a highly-leveraged transaction involving the Company.
 
SUBORDINATION OF CERTAIN DEBT SECURITIES
 
    The Indenture provides that, pursuant to a supplemental indenture or a Board
Resolution, one or more series of Debt Securities (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, whether outstanding as of the
date of the Indenture or thereafter incurred. (Section 1401).
 
    With respect to any Junior Subordinated Securities, 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 applicable grace period with respect to such default
has ended and such 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" shall mean 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 September 30, 1997, outstanding Senior Debt of the
Company aggregated approximately $1.22 billion.
 
                                       4
<PAGE>
FORM, EXCHANGE, AND TRANSFER
 
    The Debt Securities of each series will be issuable only in fully registered
form without coupons. (Section 302).
 
    At the option of the Holder, subject to the terms of the Indenture and the
limitations applicable to Global Debt Securities, Debt Securities of any series
will be exchangeable for other Debt Securities of the same series, of any
authorized denomination and of like tenor and aggregate principal amount.
(Section 305).
 
    Subject to the terms of the Indenture and the limitations applicable to
Global Debt Securities, Debt Securities may be presented for exchange as
provided above or for registration of transfer (duly endorsed or with the form
of transfer endorsed thereon duly executed) at the office of the Security
Registrar or at the office of any transfer agent designated by the Company for
such purpose. No service charge will be made for any registration of transfer or
exchange of Debt Securities, but the Company may require payment of a sum
sufficient to cover any tax or other governmental charge payable in connection
therewith. Such transfer or exchange will be effected upon the Security
Registrar or such transfer agent, as the case may be, being satisfied with the
documents of title and identity of the person making the request. The Company
has appointed the Trustee as Security Registrar. Any transfer agent (in addition
to the Security Registrar) initially designated by the Company for any Debt
Securities will be named in the applicable Prospectus Supplement. (Section 305).
The Company may at any time designate additional transfer agents or rescind the
designation of any transfer agent or approve a change in the office through
which any transfer agent acts, except that the Company will be required to
maintain a transfer agent in each Place of Payment for the Debt Securities of
each series. (Section 1002).
 
    If the Debt Securities of any series (or of any series and specified tenor)
are to be redeemed in part, the Company will not be required to (i) issue,
register the transfer of, or exchange any Debt Security of that series (or of
that series and specified tenor, as the case may be) during a period beginning
at the opening of business 15 days before the day of mailing of a notice of
redemption of any such Debt Security that may be selected for redemption and
ending at the close of business on the day of such mailing or (ii) register the
transfer of or exchange any Debt Security so selected for redemption, in whole
or in part, except the unredeemed portion of any such Debt Security being
redeemed in part. (Section 305).
 
GLOBAL DEBT SECURITIES
 
    Some or all of the Debt Securities of any series may be issued as Global
Debt Securities. Each Global Debt Security will be registered in the name of a
Depositary or a nominee thereof identified in the applicable Prospectus
Supplement, will be deposited with such Depositary or nominee or a custodian
therefor and will bear a legend regarding the restrictions on exchanges and
registration of transfer thereof referred to below and any such other matters as
may be provided for pursuant to the Indenture.
 
    Notwithstanding any provision of the Indenture or any Debt Security
described herein, no Global Debt Security may be exchanged in whole or in part
for Debt Securities registered, and no transfer of a Global Debt Security in
whole or in part may be registered, in the name of any Person other than the
Depositary for such Global Debt Security or any nominee of such Depositary
unless (i) the Depositary has notified the Company that it is unwilling or
unable to continue as Depositary for such Global Debt Security or has ceased to
be qualified to act as such as required by the Indenture, (ii) there shall have
occurred and be continuing an Event of Default with respect to such Global Debt
Security or (iii) there shall exist such circumstances, if any, in addition to
or in lieu of those described above as may be described in the applicable
Prospectus Supplement. All securities issued in exchange for a Global Debt
Security or any portion thereof will be registered in such names as the
Depositary may direct. (Sections 204 and 305).
 
    As long as the Depositary, or its nominee, is the registered Holder of a
Global Debt Security, the Depositary or such nominee, as the case may be, will
be considered the sole owner and Holder of such Global Debt Security for all
purposes under the Debt Securities and the Indenture. Except in the limited
circumstances referred to above, owners of beneficial interests in a Global Debt
Security will not be
 
                                       5
<PAGE>
entitled to have such Global Debt Security or any portion thereof registered in
their names, will not receive or be entitled to receive physical delivery of
certificated Debt Securities in exchange therefor and will not be considered to
be the owners or Holders of such Global Debt Security or any portion thereof for
any purpose under the Debt Securities or the Indenture. All payments of
principal of and any premium and interest on a Global Debt Security will be made
to the Depositary or its nominee, as the case may be, as the Holder thereof. The
laws of some jurisdictions require that certain purchasers of securities take
physical delivery of such securities in definitive form. These laws may impair
the ability to transfer beneficial interests in a Global Debt Security.
 
    Ownership of beneficial interests in a Global Debt Security will be limited
to institutions that have accounts with the Depositary or its nominee
(participants) and to persons that may hold beneficial interests through
participants. In connection with the issuance of any Global Debt Security, the
Depositary will credit, on its book-entry registration and transfer system, the
respective portion of the principal amounts of the Global Debt Security to the
accounts of its participants. Ownership of beneficial interests in a Global Debt
Security will be shown only on, and the transfer of those ownership interests
will be effected only through, records maintained by the Depositary (with
respect to participants' interests) or any such participant (with respect to
interests of persons held by such participants on their behalf). Payments,
transfers, exchanges, and other matters relating to beneficial interests in a
Global Debt Security are subject to various policies and procedures adopted by
the Depositary from time to time. None of the Company, the Trustee or any agent
of the Company or the Trustee will have any responsibility or liability for any
aspect of the Depositary's or any participant's records relating to, or for
payments made on account of, beneficial interests in a Global Debt Security, or
for maintaining, supervising, or reviewing any records relating to such
beneficial interests.
 
    Secondary trading in notes and debentures of corporate issuers is generally
settled in clearing-house or next-day funds. In contrast, beneficial interests
in a Global Debt Security, in some cases, will trade in the Depositary's
same-day funds settlement system in which secondary market trading activity in
those beneficial interests are required by the Depositary to settle in
immediately available funds. There is no assurance as to the effect, if any,
that settlement in immediately available funds would have on trading activity in
such beneficial interests. Also, settlement for purchases of beneficial
interests in a Global Debt Security upon the original issuance thereof may be
required to be made in immediately available funds.
 
PAYMENT AND PAYING AGENTS
 
    Unless otherwise indicated in the applicable Prospectus Supplement, payment
of interest on a Debt Security on any Interest Payment Date will be made to the
Person in whose name such Debt Security (or one or more Predecessor Debt
Securities) is registered at the close of business on the Regular Record Date
for such interest. (Section 307).
 
    Unless otherwise indicated in the applicable Prospectus Supplement,
principal of and any premium and interest on the Debt Securities of a particular
series will be payable at the office of such Paying Agent or Paying Agents as
the Company may designate for such purpose from time to time, except that at the
option of the Company payment of any interest may be made by check mailed to the
address of the Person entitled thereto as such address appears 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 the Company's sole Paying Agent for payments with respect to Debt
Securities of each series. Any other Paying Agents initially designated by the
Company for the Debt Securities of a particular series will be named in the
applicable Prospectus Supplement. The Company 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
the Company will be required to maintain a Paying Agent in each Place of Payment
for the Debt Securities of a particular series. (Section 1002).
 
    All moneys paid by the Company 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 the Company, and the Holder of such
Debt Security thereafter may look only to the Company for payment thereof.
(Section 1003).
 
                                       6
<PAGE>
CONSOLIDATION, MERGER, AND SALE OF ASSETS
 
    The Indenture does not contain any covenant that restricts the Company's
ability to merge or consolidate with or into any other corporation, sell or
convey all or substantially all of its 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. (Section 801).
 
EVENTS OF DEFAULT
 
    Each of the following will constitute an Event of Default under the
Indenture with respect to Debt Securities of any series: (a) failure to pay
principal of or any premium on any Debt Security of that series when due; (b)
failure to pay any interest on any Debt Securities of that series when due,
continued for 30 days; (c) failure to deposit any sinking fund payment, when
due, in respect of any Debt Security of that series; (d) failure to perform any
other covenant of the Company 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 (e) certain events of
bankruptcy, insolvency or reorganization. (Section 501).
 
    If an Event of Default (other than an Event of Default described in clause
(e) above) 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 an Event of Default described in clause (e) above 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. (Section 502). 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 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. (Section
603). 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. (Section 512).
 
    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. (Section 507). 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. (Section 508).
 
                                       7
<PAGE>
    The Company will be required to furnish to the Trustee annually a statement
by certain of its officers as to whether or not the Company, to their knowledge,
is 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.
(Section 1004).
 
MODIFICATION AND WAIVER
 
    Modifications and amendments of the Indenture may be made by the Company 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, (a) change the Stated Maturity of
the principal of, or any installment of principal of or interest on, any Debt
Security, (b) reduce the principal amount of, or any premium or interest on, any
Debt Security, (c) reduce the amount of principal of an Original Issue Discount
Security or any other Debt Security payable upon acceleration of the Maturity
thereof, (d) change the place or currency of payment of principal of, or any
premium or interest on, any Debt Security, (e) affect the applicability of the
subordination provisions to any Debt Security, (f) impair the right to institute
suit for the enforcement of any payment on or with respect to any Debt Security,
(g) 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. (Section 902).
 
    The Holders of not less than a majority in aggregate principal amount of the
Outstanding Debt Securities of any series may waive compliance by the Company
with certain restrictive provisions of the Indenture. (Section 1007). 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. (Section 513).
 
    Except in certain limited circumstances, the Company 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 may be specified by the Company (or the Trustee, if it set the
record date), and may be shortened or lengthened (but not beyond 180 days) from
time to time. (Section 104).
 
DEFEASANCE AND COVENANT DEFEASANCE
 
    If and to the extent indicated in the applicable Prospectus Supplement, the
Company may elect, at its option at any time, to have the provisions of Section
1302, relating to defeasance and discharge of indebtedness, or Section 1303,
relating to defeasance of certain restrictive covenants in the Indenture,
applied to the Debt Securities or to the Debt Securities of any series. (Section
1301).
 
    DEFEASANCE AND DISCHARGE.  The Indenture provides that, upon the Company's
exercise of its option (if any) to have Section 1302 applied to any Debt
Securities, the Company will be discharged from all its 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
 
                                       8
<PAGE>
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, the Company has
delivered to the Trustee an Opinion of Counsel to the effect that the Company
has 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. (Sections 1302 and 1304).
 
    DEFEASANCE OF CERTAIN COVENANTS.  The Indenture provides that, upon the
Company's exercise of its option (if any) to have Section 1303 applied to any
Debt Securities, the Company 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 in clause (d)
(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. The Company, in order to exercise such option, 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. The Company
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 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 the Company
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, the Company would remain liable for such payments.
(Sections 1303 and 1304).
 
TITLE
 
    The Company, the Trustee, and any agent of the Company 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. (Section 308).
 
GOVERNING LAW
 
    The Indenture and the Debt Securities will be governed by, and construed in
accordance with, the law of the State of New York. (Section 112).
 
CONCERNING THE TRUSTEE
 
    The Fifth Third Bank will be the Trustee under the Indenture. The Fifth
Third Bank also acts as the Trustee for certain unsecured debt securities of The
Cincinnati Gas & Electric Company (CG&E) and CG&E's wholly-owned subsidiary, The
Union Light Heat and Power Company, both affiliates of PSI, acts as the Trustee
for certain pollution control revenue bonds of PSI and CG&E, and acts as
registrar for the common stock of Cinergy and for the preferred stock of PSI and
CG&E. The Fifth Third Bank makes loans to, acts as depositary for, and, in the
normal course of business, also performs other services for PSI and CG&E.
 
                                       9
<PAGE>
                              PLAN OF DISTRIBUTION
 
    PSI may sell the Debt Securities in any of three ways: (i) through
underwriters or dealers; (ii) directly to a limited number of purchasers or to a
single purchaser; or (iii) through agents. The Prospectus Supplement with
respect to the Offered Securities sets forth the terms of the offering of the
Offered Securities, including the name or names of any underwriters, dealers or
agents, the purchase price of such Offered Securities and the proceeds to PSI
from such sale, any underwriting discounts and other items constituting
underwriters' compensation, any initial public offering price and any discounts
or concessions allowed or reallowed or paid to dealers. Any initial public
offering price and any discounts or concessions allowed or reallowed or paid to
dealers may be changed from time to time.
 
    If underwriters are used in the sale, the Debt 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
underwriters with respect to a particular Underwritten Offering of Offered
Securities will be named in the Prospectus Supplement relating to such offering
and, if an underwriting syndicate is used, the managing underwriter or
underwriters will be set forth on the cover page of such Prospectus Supplement.
In connection with the sale of Offered Securities, the underwriters may receive
compensation from PSI or from purchasers in the form of discounts, concessions
or commissions. The underwriters will be, and any dealers participating in the
distribution of the Offered Securities may be, deemed to be underwriters within
the meaning of the Securities Act of 1933. PSI has agreed to indemnify the
underwriters against certain civil liabilities, including liabilities under the
Securities Act of 1933. The underwriting agreement pursuant to which any Offered
Securities are to be sold will provide that the obligations of the underwriters
are subject to certain conditions precedent and that the underwriters will be
obligated to purchase all of the Offered Securities if any are purchased.
 
    Offered Securities may be sold directly by PSI or through agents designated
by PSI from time to time. The Prospectus Supplement sets forth the name of any
agent involved in the offer or sale of the Offered Securities in respect of
which the Prospectus Supplement is delivered as well as any commissions payable
by PSI to such agent. Unless otherwise indicated in the Prospectus Supplement,
any such agent will be acting on a best efforts basis for the period of its
appointment.
 
    If so indicated in the Prospectus Supplement, PSI will authorize agents,
underwriters or dealers to solicit offers by certain specified institutions to
purchase Offered Securities from PSI 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. Such contracts will be
subject to those conditions set forth in the Prospectus Supplement, and the
Prospectus Supplement will set forth the commission payable for solicitation of
such contracts.
 
                                    EXPERTS
 
    The consolidated balance sheets of PSI as of December 31, 1996 and 1995 and
the related consolidated statements of income, changes in common stock equity
and cash flows for each of the three years in the period ended December 31,
1996, included in PSI's Annual Report on Form 10-K for the year ended December
31, 1996, have been audited by Arthur Andersen LLP, independent public
accountants, as indicated in their report with respect thereto, and are
incorporated herein by reference in reliance upon the authority of said firm as
experts in accounting and auditing in giving said report.
 
                                 LEGAL OPINIONS
 
    The legality of the Debt Securities will be passed upon for PSI by Taft,
Stettinius & Hollister LLP, Star Bank Center, Cincinnati, Ohio 45202, and for
the Underwriters by Davis Polk & Wardwell, 450 Lexington Avenue, New York, New
York 10017, who may rely as to matters of Indiana law on the opinion of Taft,
Stettinius & Hollister LLP.
 
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