PUBLIC SERVICE CO OF OKLAHOMA
424B5, 1996-02-27
ELECTRIC SERVICES
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<PAGE>
                                                Filed Pursuant to Rule 424(b)(5)
                                                   Registration No. 333-00973
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED FEBRUARY 23, 1996)
                                  $75,000,000

                       PUBLIC SERVICE COMPANY OF OKLAHOMA

                          MEDIUM-TERM NOTES, SERIES A
                           (A SERIES OF SENIOR NOTES)
                    DUE 9 MONTHS OR MORE FROM DATE OF ISSUE
                                  -----------

    Public  Service Company of  Oklahoma (the "Company") may  offer from time to
time up  to $75,000,000  aggregate principal  amount of  its Medium-Term  Notes,
Series  A (the "Notes"), consisting  of an issue of  its Senior Notes secured by
its First Mortgage Bonds until the Release Date (as defined in the  accompanying
Prospectus).  The designation or designations,  the principal amount or amounts,
the offering price or prices,  the interest accrual date  or dates, the date  or
dates  of maturity, the interest rate or  rates, the interest payment dates, any
sinking fund or other redemption or repayment provisions and any other  material
terms  of the Notes will be established from  time to time and will be set forth
in supplements hereto ("Pricing Supplements"). The Notes will have maturities of
nine months or more  from their respective  dates of issue as  set forth in  the
applicable  Pricing  Supplement. Unless  otherwise  specified in  the applicable
Pricing Supplement, the Notes will be  issued in denominations of $1,000 or  any
integral  multiple thereof; and interest on each  Note will accrue from its date
of issue and will  be payable semi-annually  in arrears on  each February 1  and
August  1 and at maturity. If so specified in the applicable Pricing Supplement,
a Note may be redeemed at the option  of the Company or repaid at the option  of
its holder at a specified price or prices and on a specified date or dates.

    The  Notes will be represented either by global notes registered in the name
of a nominee of The Depository Trust Company, as depositary, or by  certificated
notes  issued to the registered  owners thereof, as set  forth in the applicable
Pricing Supplement.  Interests  in  the  global notes  will  be  shown  on,  and
transfers  thereof  will be  effected only  through,  records maintained  by The
Depository Trust Company (with  respect to its  participant's interests) and  by
its participants or persons that hold through such participants (with respect to
the  interest  of  persons  other  than  such  participants).  Except  under the
circumstances described  herein,  certificated  notes  will  not  be  issued  in
exchange for global notes.

    Until  the Release Date,  the Notes will  be secured by  the Company's First
Mortgage Bonds issued and delivered by  the Company to the Senior Note  Trustee.
See  "Description of Senior Notes -- Security; Release Date" in the accompanying
Prospectus. ON THE RELEASE DATE, THE NOTES WILL CEASE TO BE SECURED, WILL BECOME
UNSECURED GENERAL OBLIGATIONS  OF THE  COMPANY AND WILL  RANK ON  A PARITY  WITH
OTHER  SENIOR UNSECURED INDEBTEDNESS OF THE COMPANY (UNLESS OTHERWISE SECURED AS
DESCRIBED IN  THE  ACCOMPANYING PROSPECTUS  UNDER  THE CAPTION  "DESCRIPTION  OF
SENIOR NOTES -- LIMITATION OF LIENS").

    For  further  information relating  to the  Notes,  see "Description  of the
Notes" herein, "Description  of Senior  Notes" and "Description  of Senior  Note
Mortgage  Bonds"  in the  accompanying  Prospectus, and  the  applicable Pricing
Supplement.
                                ----------------

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 SUPPLEMENT  OR  ANY SUPPLEMENT
    HERETO. ANY                REPRESENTATION TO THE CONTRARY IS A CRIMINAL
                                    OFFENSE.

<TABLE>
<CAPTION>
                                          PRICE TO             AGENTS' DISCOUNTS            PROCEEDS TO
                                         PUBLIC(1)             AND COMMISSIONS(2)        THE COMPANY(2)(3)
<S>                               <C>                       <C>                       <C>
Per Note                                    100%                 .225% -- .850%          99.775% -- 99.150%
                                        $75,000,000           $168,750 -- $637,500         $74,831,250 --
Total                                                                                       $74,362,500
</TABLE>

  (1)Unless otherwise specified in the applicable Pricing Supplement, the  Notes
     will be issued at 100% of their principal amount.

  (2)The  commissions  payable to  Smith Barney  Inc. and  Morgan Stanley  & Co.
     Incorporated (each, an "Agent" and  together, the "Agents"), for each  Note
     sold  through an Agent,  as agent, shall  range from .225%  to .850% of the
     principal amount of  such Note,  depending upon maturity.  The Company  may
     also sell Notes to an Agent, as principal, for resale to investors or other
     purchasers.   Unless   otherwise  specified   in  the   applicable  Pricing
     Supplement, a Note sold to an Agent  as principal will be purchased by  the
     Agent  at a  price equal  to 100%  of the  principal amount  thereof less a
     percentage equal to the commission applicable  to an agency sale of a  Note
     of  like maturity. The  Company has agreed to  indemnify the Agents against
     certain liabilities  under the  Securities  Act of  1933, as  amended  (the
     "Act").

  (3)Assuming  that the Notes will  be issued at 100%  of their principal amount
     and before deducting expenses payable by the Company estimated at  $300,000
     including reimbursement of certain expenses of the Agents.
                                ----------------

    Offers  to purchase  the Notes  may be  solicited from  time to  time by the
Agents on behalf of the Company. The  Agents have agreed to use reasonable  best
efforts  to solicit purchases  of the Notes.  The Company may  sell Notes to any
Agent acting as principal for its own account for resale to investors and  other
purchasers at varying prices related to prevailing market prices at the times of
resale  or otherwise, to be  determined by the Agent.  The Company also may sell
the Notes directly to investors on its own behalf. The Company or the Agents may
reject any offer, whether or not solicited, in whole or in part. The Notes  will
not  be listed on any securities exchange. There can be no assurance that all of
the Notes offered hereby will be sold  or that there will be a secondary  market
for the Notes. See "Supplemental Plan of Distribution of the Notes."
                                ----------------

<TABLE>
<S>                           <C>
     SMITH BARNEY INC.            MORGAN STANLEY & CO.
                                      INCORPORATED
</TABLE>

February 26, 1996
<PAGE>
    IN CONNECTION WITH THE DISTRIBUTION OF NOTES UNDERWRITTEN BY AN AGENT ACTING
AS  PRINCIPAL, SUCH AGENT  MAY OVERALLOT OR  EFFECT TRANSACTIONS WITH  A VIEW TO
STABILIZING OR MAINTAINING THE MARKET PRICE  OF THE NOTES AT LEVELS ABOVE  THOSE
WHICH  MIGHT  OTHERWISE PREVAIL  IN THE  OPEN MARKET.  SUCH TRANSACTIONS  MAY BE
EFFECTED IN ANY OVER-THE-COUNTER MARKET OR  OTHERWISE AND, IF COMMENCED, MAY  BE
DISCONTINUED AT ANY TIME.

                              RECENT DEVELOPMENTS

    SUMMARY  UNAUDITED RESULTS OF 1995 OPERATIONS.   Net income for common stock
for 1995 was $81 million, a 20%  increase from 1994 net income for common  stock
of  $67  million. The  increase  was due  primarily  to decreased  operating and
maintenance expenses and the sale of a non-utility fiber optic telecommunication
property during 1995.

    Net income for common  stock for the three  month period ended December  31,
1995 was $3.0 million, compared to $7.8 million for the same period in 1994. The
decrease  was due primarily to lower  unbilled revenues, higher depreciation and
amortization due to increased depreciable plant and higher interest expense  due
to increased borrowings, offset in part by lower maintenance costs.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The  Company's Current Report on Form 8-K dated February 23, 1996 heretofore
filed by the Company with the Securities and Exchange Commission pursuant to the
Securities Exchange Act  of 1934, as  amended, is incorporated  by reference  in
this Prospectus Supplement.

                            DESCRIPTION OF THE NOTES

    The  statements under this  caption are intended to  summarize the Notes and
the Senior Note Indenture. They do not purport to be complete and are  qualified
in  their entirety by reference to the  descriptions thereof set forth under the
captions "Description of Senior Notes" and "Description of Senior Note  Mortgage
Bonds",  in the accompanying Prospectus  and to the Sections  of the Senior Note
Indenture cited therein. Capitalized terms used herein and not defined have  the
meanings specified in the accompanying Prospectus.

GENERAL

    The  Notes are to be issued as a  series of the Company's Senior Notes under
the Senior Note Indenture as supplemented  by a Supplemental Indenture dated  as
of  February 1, 1996, between the Company  and Liberty Bank and Trust Company of
Tulsa, National Association, as trustee  (the "Supplemental Indenture"). At  the
date  of this Prospectus Supplement, no Senior  Notes have been issued under the
Senior Note Indenture.

    Unless otherwise indicated in the  applicable Pricing Supplement and  except
under the circumstances described under the caption "Description of Senior Notes
- --  Book-Entry Only  System" in the  accompanying Prospectus, the  Notes will be
issued as one or  more global notes,  each of which will  be deposited with  the
Depositary.  Beneficial  interests in  the  global notes  will  be shown  on and
transfers thereof will be effected through records maintained by the  Depositary
and its Participants. Beneficial interests in the global notes will be exchanged
for  Notes in certificated  form only under  the limited circumstances described
under "Description of Senior Notes -- Book-Entry Only System."

    The Notes will be offered on a continuous basis, will mature nine months  or
more  from  their date  of  issue, and  may be  subject  to redemption  prior to
maturity or repayment at the option of the holder at the price or prices and the
time or times specified in  the applicable Pricing Supplement. Unless  otherwise
indicated  in the  applicable Pricing  Supplement, the  Notes will  be issued in
denominations of $1,000 or any integral multiple thereof.

                                      S-2
<PAGE>
    The Pricing Supplement relating to each issue of the Notes will describe the
following terms:  (1) the  designation and  aggregate principal  amount of  such
Notes,  (2)  the offering  price  (expressed as  a  percentage of  the aggregate
principal amount thereof) of such Notes,  (3) the interest accrual date of  such
Notes,  (4) the date on which such Notes  will mature, (5) the rate or rates, or
method of calculation of such rates, at which such Notes will bear interest, (6)
the dates on which such interest will be payable, (7) any sinking fund or  other
redemption  or repayment provisions of such Notes, (8) the use of proceeds if to
discharge indebtedness and (9) any other material terms of such Notes.

SECURITY

    Upon the issuance of  the Notes, the Company  will simultaneously issue  and
deliver  to the  Senior Note  Trustee, as security  for all  Senior Notes, First
Mortgage Bonds, Series  X (the "Series  X First Mortgage  Bonds"). The Series  X
First  Mortgage Bonds will have the  same interest rates, interest payment dates
and stated maturity dates, and will be in the same aggregate principal  amounts,
as  the Notes. The  Series X First  Mortgage Bonds delivered  to the Senior Note
Trustee will  be  authenticated  under  the  First  Mortgage  Indenture  against
$75,000,000  aggregate  principal amount  of  previously retired  First Mortgage
Bonds.

    As provided in  the Supplemental Indenture  dated February 1,  1996, to  the
Company's First Mortgage Indenture setting forth the terms of the Series X First
Mortgage  Bonds, the Company's  obligation to make payments  with respect to the
principal of and/or interest on the Series X First Mortgage Bonds shall be fully
or partially, as the case may be,  satisfied and discharged to the extent  that,
at the time that any such payment shall be due, the then due principal of and/or
interest  on the Notes  shall have been  fully or partially  paid or there shall
have been deposited  with the Senior  Note Trustee pursuant  to the Senior  Note
Indenture  sufficient available  funds to  fully or  partially pay  the then due
principal and/or interest on the Notes. Conversely, subject to the provisions of
the Senior Note Indenture governing disbursement of funds following an event  of
default,  payment by the Company to the Senior Note Trustee of the principal and
interest on the Series X First Mortgage Bonds will be applied by the Senior Note
Trustee to satisfy the Company's obligations  with respect to the principal  and
interest on the Notes.

    Reference is made to "Description of Senior Notes -- Security; Release Date"
in  the accompanying  Prospectus for  a description  of the  circumstances under
which all or part of the Senior Note Mortgage Bonds will cease to be held by the
Senior Note  Trustee as  security for  the  Senior Notes.  As explained  in  the
Prospectus,  the  Senior Notes  will  cease to  be  secured by  the  Senior Note
Mortgage Bonds on the Release Date and will become unsecured general obligations
of the Company. However, the Senior Notes can become secured by certain property
of the Company from and  after the Release Date  as explained in the  Prospectus
under the caption "Limitations on Liens."

LIMITATIONS ON LIENS

    The  Supplemental  Indenture provides  that the  covenant summarized  in the
accompanying Prospectus under  "Description of  Senior Notes  -- Limitations  on
Liens" is applicable to the Notes.

PAYMENT OF PRINCIPAL AND INTEREST

    Each  Note will  bear interest from  its original issue  date (the "Original
Issue Date") until  the principal amount  thereof shall have  been paid or  made
available  for payment. Interest  on each Note will  be payable semi-annually on
each February  1 and  August 1  (each  an "Interest  Payment Date"),  except  as
otherwise  indicated  in the  applicable  Pricing Supplement,  and  at maturity;
provided, however,  that the  first payment  of  interest on  any Note  with  an
Original  Issue  Date between  a  Record Date  (as  hereinafter defined)  and an
Interest Payment  Date  shall  be  made on  the  second  Interest  Payment  Date
succeeding  the  Original Issue  Date, as  specified  in the  applicable Pricing
Supplement.

    Interest in respect of global  notes will be payable  by the Company to  the
Depositary and by the Depositary to its Participants. Payments to the beneficial
owners  of the global notes will be the responsibility of the Participants. (See
"Description of  Senior Notes  -- Book-Entry  Only System"  in the  accompanying
Prospectus).

                                      S-3
<PAGE>
    Interest  payable on  certificated Notes will  be payable to  the persons in
whose name such Notes are registered at the close of business on the Record Date
with respect to  each Interest  Payment Date; provided,  however, that  interest
payable  at maturity will be  payable to the persons  to whom principal shall be
payable.

    Unless otherwise specified  in the  applicable Pricing  Supplement, (i)  the
"Record  Date" with respect to any Interest Payment Date shall be the January 15
or July 15 (whether or not a Business  Day), as the case may be, preceding  such
Interest  Payment Date, and (ii)  interest on each Note  will be computed on the
basis of a 360-day year of twelve 30-day months.

REDEMPTION

    The Pricing Supplement relating to each Note will indicate whether and under
what circumstances such Note will be redeemable by the Company prior to maturity
and the  redemption price  or  prices, including  premiums, if  any,  applicable
thereto.

    In the case of any redemption of the Notes, notice thereof shall be provided
by  mail to the holders of the Notes  being redeemed by first class mail, mailed
not less than 30 days prior to  the date fixed for redemption to the  respective
addresses  of  such  holders as  shown  in  the registry  books  for  the Notes.
Beneficial owners  of the  global  notes issued  will  receive any  such  notice
through Participants.

    The Pricing Supplement relating to each Note will indicate whether and under
what  circumstances  such  Note will  be  the  subject of  any  sinking  fund or
analogous provisions.

REPAYMENT AT OPTION OF HOLDER

    The Pricing Supplement relating to each Note will indicate whether such Note
will be  repayable at  the option  of its  registered holder,  and, if  so,  the
repayment  price or  prices and the  time or times  at which such  option may be
exercised. In order for  a Note to  be repaid, the Company  must receive at  its
office  or agency in New York City  (currently, the Senior Note Trustee), within
the period specified in  the applicable Pricing Supplement,  such Note with  the
form  entitled  "Option to  Elect  Repayment" on  the  reverse of,  or otherwise
accompanying, such Note  duly completed. Any  such election so  received by  the
Company  within such  period shall be  irrevocable. The repayment  option may be
exercised by the registered holder of a Note for less than the entire  principal
amount of such Note provided the principal amount which is to be repaid is equal
to  $1,000 or  an integral multiple  of $1,000  or such other  minimum amount as
specified in  the  applicable  Pricing  Supplement.  All  questions  as  to  the
validity, eligibility (including time of receipt) and acceptance of any Note for
repayment  will be determined by the  Company, whose determination will be final
and binding. Beneficial owners of global notes must exercise this option through
Participants.

                 SUPPLEMENTAL PLAN OF DISTRIBUTION OF THE NOTES

    Subject to the terms and conditions set forth in the Distribution Agreement,
dated February  26, 1996  (the "Distribution  Agreement"), the  Notes are  being
offered,  from time to  time, on a  continuous basis by  the Company through the
Agents, which  have agreed  to  use their  reasonable  best efforts  to  solicit
purchases  of the Notes. The Company will have the right to accept or reject any
proposed purchase of Notes in whole or in part. The Agents will have the  right,
in  their discretion  reasonably exercised, to  reject any  proposed purchase of
Notes, in whole or in part. Payment of  the purchase price of the Notes will  be
required  to be made in immediately available funds. The Company will pay to the
Agents commissions of  from .225% to  .850% of the  principal amounts of  Notes,
depending  upon maturities, for  sales made through them  as Agents. The Company
may designate one or more additional Agents from time to time, provided that the
commission payable to any such  additional Agent with respect  to any sale of  a
Note  by such  additional Agent  does not  exceed the  commission that  would be
payable with respect to any sale of such Notes by an Agent named herein.

    The Company also may  sell Notes to  the Agents as  principal for resale  to
investors  or other  purchasers at varying  prices related  to prevailing market
prices at the time of resale, or otherwise, as determined by the Agents.  Unless
otherwise  agreed  upon  at the  time  of sale,  a  Note  sold to  an  Agent, as
principal, will  be purchased  by the  Agent at  a price  equal to  100% of  its
principal  amount less  a percentage  equal to  the commission  applicable to an
agency sale  of  a  Note of  like  maturity.  The Agents  may  resell  any  Note

                                      S-4
<PAGE>
purchased  by them as principal to dealers at prices determined by the Agents at
the time of resale  and may pay such  dealer a commission not  in excess of  the
commission  received by the Agents from the  Company. Such dealers may be deemed
to be "underwriters"  within the meaning  of the Act.  After the initial  public
offering  of Notes  to be resold  at a  fixed public offering  price, the public
offering price and discount may be changed.

    The Company has reserved the right to sell Notes directly on its own behalf.
No commission will be payable on any Note sold directly by the Company.

    The Agents,  whether acting  as agent  or  principal, may  be deemed  to  be
"underwriters"  within  the  meaning  of  the Act.  The  Company  has  agreed to
indemnify the Agents  against certain liabilities,  including liabilities  under
the  Act.  The Company  also  has agreed  to  reimburse the  Agents  for certain
expenses.

    Each of  the Agents,  from  time to  time,  may perform  various  investment
banking services for the Company and its affiliates.

    The  Notes are a new issue of  securities with no established trading market
and will not be listed on any securities exchange. The Agents have informed  the
Company  that  they intend  to make  a market  in  the Notes,  but are  under no
obligation to do so, and that such market making may be discounted at any  time.
No  assurance can be given as to the  existence of a secondary market for or the
liquidity of the Notes.

                                      S-5
<PAGE>
PROSPECTUS

                                  $75,000,000

                                  SENIOR NOTES
                                       OF
                       PUBLIC SERVICE COMPANY OF OKLAHOMA

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

    Public  Service Company  of Oklahoma (the  "Company") intends  to offer from
time to  time, in  one or  more series,  up to  $75,000,000 aggregate  principal
amount  of debentures,  notes or  other evidences  of indebtedness  (the "Senior
Notes") in amounts,  at prices  and on  terms to be  determined at  the time  of
offering.

    The  series designation, aggregate principal amount, maturity, interest rate
and interest payment dates,  redemption provisions, nature  of any security  for
the Senior Notes, sinking fund provisions, initial public offering price and any
other specific terms of each series of the Senior Notes in respect of which this
Prospectus  is being delivered, will be set  forth in a Prospectus Supplement or
Pricing Supplement (collectively, the  "Prospectus Supplement") to be  delivered
at  the time of the  offering and sale of the  Senior Notes. See "DESCRIPTION OF
THE SENIOR NOTES" herein.

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

    The Senior Notes will  be represented either by  Global Notes registered  in
the  name of The Depository Trust Company ("DTC"), as depositary ("Depositary"),
or its nominee, or by securities  in certificated form issued to the  registered
owners  thereof, as set forth in the applicable Prospectus Supplement. Interests
in the Global Notes  will be shown  on, and transfers  thereof will be  effected
only  through, records maintained by the Depositary and its participants. Global
Notes will not be exchanged for certificated securities except in  circumstances
described therein or in the applicable Prospectus Supplement.

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

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.

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

    The  Company may sell the  Senior Notes in one or  more series to or through
underwriters or dealers  designated from  time to time  through negotiation,  or
directly  to  other  purchasers  or through  agents.  The  Prospectus Supplement
applicable to  any series  of Senior  Notes will  set forth  the initial  public
offering  price,  the proceeds  to  the Company,  the  names of  any purchasers,
underwriters or agents and any applicable discounts or commissions with  respect
to the Senior Notes being offered. See "PLAN OF DISTRIBUTION".

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

               THE DATE OF THIS PROSPECTUS IS FEBRUARY 23, 1996.
<PAGE>
    NO  DEALER, SALESMAN  OR ANY  OTHER PERSON HAS  BEEN AUTHORIZED  TO GIVE ANY
INFORMATION OR  TO MAKE  ANY  REPRESENTATION NOT  CONTAINED OR  INCORPORATED  BY
REFERENCE  IN THIS PROSPECTUS AND,  WITH RESPECT TO ANY  SERIES OF SENIOR NOTES,
THE  PROSPECTUS  SUPPLEMENT  RELATING  THERETO,  AND  IF  GIVEN  OR  MADE,  SUCH
INFORMATION  OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY OR ANY UNDERWRITER, DEALER OR AGENT. NEITHER THIS PROSPECTUS  NOR
ANY  PROSPECTUS SUPPLEMENT CONSTITUTES AN OFFER TO  SELL OR A SOLICITATION OF AN
OFFER TO BUY ANY OF THE SECURITIES OFFERED HEREBY OR THEREBY IN ANY JURISDICTION
TO ANY PERSON TO WHOM  IT IS UNLAWFUL TO MAKE  SUCH OFFER IN SUCH  JURISDICTION.
NEITHER  THE DELIVERY  OF THIS PROSPECTUS  OR ANY PROSPECTUS  SUPPLEMENT NOR ANY
SALE MADE HEREUNDER  OR THEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE  ANY
IMPLICATION  THAT THERE HAS BEEN  NO CHANGE IN THE  AFFAIRS OF THE COMPANY SINCE
THE DATE HEREOF OR THEREOF OR THAT THE INFORMATION CONTAINED OR INCORPORATED  BY
REFERENCE HEREIN OR THEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO ITS DATE.

                             AVAILABLE INFORMATION

    The  Company is subject to the  informational requirements of the Securities
Exchange Act  of  1934,  as  amended (the  "Exchange  Act")  and  in  accordance
therewith  files reports and other information  with the Securities and Exchange
Commission (the "Commission"). Such reports  and other information filed by  the
Company  can  be  inspected  and  copied  at  the  public  reference  facilities
maintained by  the  Commission  at  450 Fifth  Street,  N.W.,  Washington,  D.C.
20549-1004;  and at the  Commission's Regional Offices at  500 West Madison St.,
Suite 1400,  Chicago, Illinois  60661-2511 and  Seven World  Trade Center,  13th
Floor, New York, New York 10048. Copies of such material can also be obtained at
prescribed  rates from  the Public  Reference Section  of the  Commission at its
principal office at 450 Fifth Street, N.W., Washington, D.C. 20549.

    It is the Company's current practice to  prepare and mail to the holders  of
its  Preferred  Stock copies  of the  Company's  annual financial  reports. Such
reports contain  certain financial  information that  is examined  and  reported
upon,   with  an  opinion   expressed,  by  the   Company's  independent  public
accountants. The Company is not required to and does not provide annual  reports
to  the holders of its  debt securities unless specifically  requested by such a
holder.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

    The following documents heretofore filed by the Company with the  Commission
pursuant to the Exchange Act are incorporated by reference in this Prospectus.

    1.  The Company's Annual Report on Form 10-K for the year ended December 31,
       1994.

    2.   The  Company's Quarterly  Reports on Form  10-Q for  the quarters ended
       March 31, 1995, June 30, 1995 and September 30, 1995 and Form 10-Q/A  for
       the quarter ended September 30, 1995.

    All  documents filed by the Company pursuant to Sections 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination  of the  offering of  the Senior  Notes shall  be deemed  to  be
incorporated  by reference into  this Prospectus from  their respective dates of
filing.

    THE COMPANY  HEREBY UNDERTAKES  TO PROVIDE  WITHOUT CHARGE  TO EACH  PERSON,
INCLUDING  ANY BENEFICIAL OWNER OF THE SENIOR NOTES, TO WHOM THIS PROSPECTUS HAS
BEEN DELIVERED, UPON THE WRITTEN OR ORAL  REQUEST OF ANY SUCH PERSON, A COPY  OF
ANY  OR ALL OF  THE FOREGOING DOCUMENTS INCORPORATED  HEREIN BY REFERENCE (OTHER
THAN EXHIBITS  TO SUCH  DOCUMENTS  WHICH ARE  NOT SPECIFICALLY  INCORPORATED  BY
REFERENCE  INTO THE  INFORMATION THAT THE  REGISTRATION STATEMENT INCORPORATES).
WRITTEN OR TELEPHONE REQUESTS SHOULD BE  DIRECTED TO STEPHEN D. WISE,  DIRECTOR,
FINANCE,  CENTRAL  AND SOUTH  WEST  CORPORATION, 1616  WOODALL  RODGERS FREEWAY,
DALLAS, TEXAS 75202, AS AGENT FOR THE COMPANY, TELEPHONE NUMBER (214) 777-1000.

                                       2
<PAGE>
                               PROSPECTUS SUMMARY

    THE  FOLLOWING MATERIAL IS QUALIFIED IN ITS  ENTIRETY BY, AND SHOULD BE READ
IN CONJUNCTION WITH, THE INFORMATION APPEARING ELSEWHERE IN THIS PROSPECTUS,  IN
THE  APPLICABLE PROSPECTUS SUPPLEMENT AND IN THE DOCUMENTS, FINANCIAL STATEMENTS
AND OTHER INFORMATION INCORPORATED BY REFERENCE IN THIS PROSPECTUS.

                                  THE OFFERING

<TABLE>
<S>                                 <C>
Company...........................  Public Service Company of Oklahoma

Amount and Type of Security.......  Not exceeding $75,000,000 of Senior Notes

Interest Payment Dates............  Semiannually on dates to be determined

Maturity Date.....................  To be determined

Redemption........................  To be determined

Security..........................  Secured by the Company's first mortgage bonds in the
                                    circumstances and to the extent described under the
                                    caption "DESCRIPTION OF SENIOR NOTES -- Security;
                                    Release Date"

Use of Proceeds...................  To redeem, or reimburse the Company's treasury for the
                                    redemption or repurchase of all or a portion of certain
                                    of the Company's first mortgage bonds, to repay
                                    short-term debt, to provide working capital or for other
                                    general corporate purposes
</TABLE>

                                  THE COMPANY

<TABLE>
<S>                                 <C>
Business..........................  A public utility engaged in the production, purchase,
                                    transmission, distribution and sale of electricity

Service Area......................  Approximately 30,000 square miles in Oklahoma

Population of Service Area
 (December 31, 1995)..............  Approximately 1,031,000

Customers (December 31, 1995).....  Approximately 473,000
</TABLE>

                                       3
<PAGE>
                         SELECTED FINANCIAL INFORMATION

                             (DOLLARS IN THOUSANDS)

<TABLE>
<CAPTION>
                                              TWELVE
                                              MONTHS
                                               ENDED          YEAR ENDED DECEMBER 31,
                                             DECEMBER    ----------------------------------
                                             31, 1995       1994        1993        1992
                                            -----------  ----------  ----------  ----------
                                            (UNAUDITED)
<S>                                         <C>          <C>         <C>         <C>
Operating Revenues........................   $ 690,823   $  740,496  $  707,536  $  622,092
Operating Income..........................     111,769       98,258      72,156      78,096
Net Income Before Cumulative Effect of a
 Change in Accounting Principles..........      81,828       68,266      40,496      45,562
Cumulative Effect of a Change in
 Accounting Principles....................      --           --           6,223      --
Net Income................................      81,828       68,266      46,719      45,562
Net Utility Plant.........................   1,330,376    1,304,518   1,246,938   1,211,741
</TABLE>

<TABLE>
<CAPTION>
                                                                           CAPITALIZATION AT
                                                                           DECEMBER 31, 1995
                                                                         ---------------------
                                                                              (UNAUDITED)
<S>                                                                      <C>        <C>
Long-Term Debt.........................................................  $ 379,250       42.8%
Preferred Stock........................................................     19,826        2.2
Common Equity..........................................................    487,511       55.0
                                                                         ---------      -----
                                                                         $ 886,587      100.0%
                                                                         ---------      -----
                                                                         ---------      -----
</TABLE>

                                       4
<PAGE>
                                  THE COMPANY

    Public  Service Company  of Oklahoma, an  Oklahoma corporation,  is a public
utility company engaged in the production, purchase, transmission,  distribution
and  sale of electricity in eastern and southwestern Oklahoma. Central and South
West Corporation ("CSW"), a registered public utility holding company under  the
Public  Utility Holding Company Act  of 1935, as amended  (the "1935 Act"), owns
all of the  issued and outstanding  Common Stock of  the Company. The  Company's
executive  offices  are  located  at  212  East  Sixth  Street,  Tulsa, Oklahoma
74119-1212, telephone number (918) 599-2000.

    RATIO OF EARNINGS TO FIXED CHARGES (UNAUDITED):

<TABLE>
<CAPTION>
      TWELVE
   MONTHS ENDED                     YEAR ENDED DECEMBER 31,
   DECEMBER 31,      -----------------------------------------------------
       1995            1994       1993       1992       1991       1990
- -------------------  ---------  ---------  ---------  ---------  ---------
<S>                  <C>        <C>        <C>        <C>        <C>
          4.32            4.03       2.78       2.95       3.33       2.93
</TABLE>

    For computation of the ratio: (i) earnings consist of operating income  plus
Federal  and  State  income  taxes, deferred  income  taxes  and  investment tax
credits, other income  and deductions,  allowance for funds  (both borrowed  and
equity) used during construction and the interest component of financing leases;
and  (ii) fixed charges  consist of interest on  long-term debt, amortization of
debt, other interest and the interest component of financing leases.

                                USE OF PROCEEDS

    Unless otherwise  specified in  the  applicable Prospectus  Supplement,  the
Company  intends  to use  the net  proceeds from  the sale  of the  Senior Notes
offered hereby to redeem, or reimburse the Company's treasury for the redemption
or repurchase  of,  all  or  a  portion  of  certain  series  of  the  Company's
outstanding  first mortgage bonds, to pay  costs associated with the issuance of
the Senior Notes, to repay outstanding short-term borrowings, to provide working
capital and for other general corporate purposes.

                          DESCRIPTION OF SENIOR NOTES

    GENERAL.  The  following description  sets forth certain  general terms  and
provisions  of the Senior  Notes to which any  Prospectus Supplement may relate.
The description does not purport to be complete and is subject to and  qualified
in  its entirety  by, all  of the  provisions of  the Senior  Note Indenture (as
defined below), which is incorporated herein by reference and the form of  which
is  an exhibit to the Registration Statement of which this Prospectus is a part.
The particular terms of  the Senior Notes offered  by any Prospectus  Supplement
and the extent, if any, to which such general provisions may apply to the Senior
Notes  so offered will be described therein. References to section numbers under
this caption are references to the section numbers of the Senior Note Indenture.

    The Senior  Notes  will be  issued  under  an indenture  (the  "Senior  Note
Indenture"),  the form  of which  is an  exhibit to  the Registration Statement,
between the  Company and  Liberty  Bank and  Trust  Company of  Tulsa,  National
Association, as trustee (the "Senior Note Trustee").

    There  is no requirement under the  Senior Note Indenture that future issues
of debt securities of the Company be issued under the Senior Note Indenture, and
the Company will be free to employ other indentures or documentation, containing
provisions different  from  those  included  in the  Senior  Note  Indenture  or
applicable  to one  or more  issues of Senior  Notes, in  connection with future
issues of such other debt securities.

    The Senior Note Indenture does not  limit the aggregate principal amount  of
the  Senior Notes  that may  be issued  thereunder. Until  the Release  Date (as
defined below), the Senior Notes  will be secured by one  or more series of  the
Company's first mortgage bonds issued and delivered by the Company to the Senior
Note  Trustee. See  "Security; Release Date."  FROM AND AFTER  THE RELEASE DATE,

                                       5
<PAGE>
ANY SENIOR NOTES SECURED BY THE COMPANY'S FIRST MORTGAGE BONDS WHEN ISSUED  WILL
CEASE  TO BE SECURED  AS TO THE  PAYMENT OF PRINCIPAL  AND INTEREST, WILL BECOME
UNSECURED GENERAL OBLIGATIONS  OF THE  COMPANY AND WILL  RANK ON  A PARITY  WITH
OTHER  SENIOR UNSECURED INDEBTEDNESS  OF THE COMPANY.  The Senior Note Indenture
provides that, in addition to the Senior Notes offered hereby, additional Senior
Notes may be  issued thereunder,  without limitation as  to aggregate  principal
amount,  provided that, prior  to the Release  Date, the amount  of Senior Notes
that may be issued  cannot exceed the  amount of first  mortgage bonds that  the
Company  is able to  issue under its  Indenture dated July  1, 1945, between the
Company and Liberty Bank  and Trust Company of  Tulsa, National Association,  as
trustee  (the  "First Mortgage  Trustee"), as  heretofore amended  and as  to be
further amended in  connection with the  sale of each  series of first  mortgage
bonds  by a supplemental indenture (the  "Supplemental Indenture") to be entered
into in connection with the creation and issuance of the first mortgage bonds of
any series (collectively  the "First Mortgage  Indenture"). See "DESCRIPTION  OF
SENIOR NOTE MORTGAGE BONDS -- Issuance of Additional Bonds."

    The  Senior Note Indenture provides that the  Senior Notes will be issued in
one or  more  series as  notes  or debentures  secured  by the  Company's  first
mortgage  bonds or, in the circumstances  described under the caption "Security;
Release Date," as unsecured notes or debentures. The Senior Notes may be  issued
at  various times and may have differing maturity dates and may bear interest at
differing rates. The Prospectus  Supplement applicable to  each issue of  Senior
Notes  will specify: (1) the designation  and aggregate principal amount of such
Senior Notes; (2)  the date  on which  such Senior  Notes will  mature; (3)  the
interest  rate or rates, or method of calculation of such rate or rates, on such
Senior Notes, and the date from which such interest shall accrue; (4) the  dates
on  which such interest  will be payable;  (5) the record  dates for payments of
interest; (6) any redemption terms; (7)  the period or periods within which  the
price  or prices at  which and the  terms and conditions  upon which such Senior
Notes may be repaid, in whole or in  part, at the option of the holder  thereof;
(8) the place or places, if any, in addition to or in the place of the office of
the  Trustee, where the principal of (and premium, if any) and interest, if any,
on such Senior Notes shall be  payable; and (9) other specific terms  applicable
to  such Senior Notes.  Unless otherwise indicated  in the applicable Prospectus
Supplement, the Senior Notes  will be denominated in  United States currency  in
minimum denominations of $1,000 and integral multiples thereof.

    Unless  otherwise indicated  in the applicable  Prospectus Supplement, there
are no provisions in the Senior Note Indenture or the Senior Notes that  require
the  Company to  redeem, or  permit the  holders to  cause a  redemption of, the
Senior Notes or that otherwise protect the holders in the event that the Company
incurs substantial additional indebtedness, whether or not in connection with  a
change  in control  of the Company.  However, any change  in control transaction
that involves the  incurrence of  additional long-term  indebtedness (as  notes,
first  mortgage bonds or otherwise)  by the Company in  such a transaction would
require approval  of  state utility  regulatory  authorities and,  possibly,  of
federal  utility regulatory authorities. Management believes that such approvals
would be unlikely  in any transaction  that would  result in the  Company, or  a
successor to the Company, having a highly leveraged capital structure.

    REGISTRATION,  TRANSFER, EXCHANGE AND FORM.  Senior Notes of any series will
be exchangeable for  other Senior  Notes of the  same series  of any  authorized
denominations and of a like aggregate principal amount and tenor. (Section 305)

    Unless  otherwise indicated in the  applicable Prospectus Supplement, Senior
Notes  may  be  presented  for  registration  of  transfer  (duly  endorsed   or
accompanied by a duly executed written instrument of transfer), at the office or
agency  maintained for such purpose  with respect to any  series of Senior Notes
and referred to in the applicable Prospectus Supplement, without service  charge
and upon payment of any taxes and other governmental charges as described in the
Senior Note Indenture. (Section 305)

                                       6
<PAGE>
    In  the event of  any redemption of  Senior Notes of  any series, the Senior
Note Trustee will  not be required  to exchange  or register a  transfer of  any
Senior  Notes of  such series  selected, called  or being  called for redemption
except, in the  case of  any Senior  Note to be  redeemed in  part, the  portion
thereof not to be so redeemed. (Section 305)

    BOOK-ENTRY  ONLY SYSTEM.  Each  series of Senior Notes  may be issued in the
form of one or more global notes  (the "Global Notes") representing all or  part
of  such series of Senior Notes and which will be deposited with or on behalf of
the Depositary and registered in  the name of the  Depositary or nominee of  the
Depositary.  Certificated Senior Notes will not be exchangeable for Global Notes
and, except under the circumstances described  below, the Global Notes will  not
be exchangeable for certificated Senior Notes.

    The  Depositary  has advised  the Company  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 Exchange Act. The  Depositary
holds  securities  that  its  participants  ("Participants")  deposit  with  the
Depositary. The Depositary also facilitates the settlement among Participants of
securities transactions, such as transfers and pledges, in deposited  securities
through  electronic computerized  book-entry changes  in Participants' accounts,
thereby eliminating the need for  physical movement of securities  certificates.
Participants  include securities  brokers and  dealers, banks,  trust companies,
clearing corporations and certain other  organizations. The Depositary is  owned
by  a number of its  Participants and by the New  York Stock Exchange, Inc., the
American Stock Exchange Inc. and the National Association of Securities Dealers,
Inc. Access to The Depository Trust  Company system is also available to  others
such  as securities  brokers and dealers,  banks and trust  companies that clear
through or maintain a custodial relationship with a Participant, either directly
or indirectly. The Rules applicable to  the Depositary and its Participants  are
on file with the Commission.

    Upon  the issuance  of the Global  Notes in registered  form, the Depositary
will credit, on its book-entry registration and transfer system, the  respective
principal  amounts of the  Senior Notes represented  by the Global  Notes to the
accounts of Participants. The accounts to be credited shall be designated by the
Underwriters. Ownership  of beneficial  interests in  the Global  Notes will  be
limited to Participants or persons that may hold interests through Participants.
Ownership  of beneficial interests  by Participants in the  Global Notes will be
shown on, and  the transfer  of that ownership  interest will  be effected  only
through,  records  maintained by  the Depositary  or  its nominee.  Ownership of
beneficial  interests  in  the  Global  Notes  by  persons  that  hold   through
Participants  will  be shown  on, and  the transfer  of that  ownership interest
within such Participant  will be  effected only through,  records maintained  by
such  Participant. Owners of  beneficial interests in the  Global Notes will not
receive written confirmation from  the Depositary of  their purchases, but  they
are   expected  to  receive  written   confirmation  providing  details  of  the
transactions, as  well  as  periodic  statements of  their  holdings,  from  the
Participants  through which  they purchased  beneficial interests  in the Global
Notes. The  laws  of  some  jurisdictions 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 transfer beneficial interests  in
the Global Notes.

    So  long as the Depositary,  or its nominee, is  the registered owner of the
Global Notes,  the Depositary  or  its nominee,  as the  case  may be,  will  be
considered  the sole  owner or  holder of  the Senior  Notes represented  by the
Global Notes for  all purposes under  the Senior Note  Indenture. Except as  set
forth  below, owners  of beneficial  interests in the  Global Notes  will not be
entitled to have Senior Notes registered in their names, will not receive or  be
entitled to receive physical delivery of the Senior Notes in definitive form and
will  not  be considered  the owner  or  holders thereof  under the  Senior Note
Indenture.

                                       7
<PAGE>
    Payment of principal  of, premium, if  any, and any  interest on the  Senior
Notes  will be made to the Depositary or its nominee, as the case may be, as the
registered owner  or the  holder of  the Global  Notes representing  the  Senior
Notes.  None of the  Company, the Senior  Note Trustee, any  paying agent or the
registrar for the Senior Notes will have any responsibility or liability for any
aspect of the  records relating  to or payments  made on  account of  beneficial
ownership  interests  in the  Global Notes  or  for maintaining,  supervising or
reviewing any records relating to such beneficial ownership interests.

    The Company has  been advised by  the Depositary that,  upon receipt of  any
payment  of principal, premium or  interest in respect of  the Global Notes, the
Depositary will  credit  immediately  Participants' accounts  with  payments  in
amounts  proportionate to their respective beneficial interests in the principal
amount of  the Global  Notes as  shown on  the records  of the  Depositary.  The
Company  also  expects that  payments by  Participants  to owners  of beneficial
interests in the Global Notes held through such Participants will be governed by
standing  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.

    The Global Notes may not be transferred except as a whole by the  Depositary
to  a  nominee of  the  Depositary or  by  a nominee  of  the Depositary  to the
Depositary or another nominee of the Depositary or by the Depositary or any such
nominee to a successor of the Depositary or a nominee of such successor. If  the
Depositary  is at any time  unwilling or unable to  continue as Depositary and a
successor Depositary is  not appointed by  the Company within  ninety days,  the
Company  will issue certificated notes in definitive registered form in exchange
for the Global Notes representing the Senior Notes. In addition, the Company may
at any time and in its sole discretion determine not to have any Senior Notes in
registered form represented by one or more global notes and, in such event, will
issue certificated notes  in definitive form  in exchange for  the Global  Notes
representing  the Senior Notes. In  any such instance, an  owner of a beneficial
interest in the Global Notes will be entitled to physical delivery in definitive
form of  certificated Senior  Notes represented  by the  Global Notes  equal  in
principal amount to such beneficial interest and to have such certificated notes
registered in its name.

    PAYING  AGENTS.  The Company will maintain  an office or agency where Senior
Notes may be presented or surrendered for payment. The Company will give  prompt
written notice to the Senior Note Trustee of the location, and any change in the
location,  of such office  or agency. If at  any time the  Company shall fail to
maintain any such required office or agency or shall fail to furnish the  Senior
Note  Trustee with the address thereof, such presentations and surrenders may be
made or served at the corporate trust office of the Senior Note Trustee, and, in
such event, the Senior Note Trustee shall act as the Company's agent to  receive
all such presentations and surrenders. (Section 1002)

    All  monies  paid  by the  Company  to a  paying  agent for  the  payment of
principal of,  interest or  premium, if  any, on  any Senior  Note which  remain
unclaimed  at the  end of  two years after  such principal,  interest or premium
shall have become due and payable will  be repaid to the Company and the  holder
of  such  Senior Note  will  thereafter look  only  to the  Company  for payment
thereof. (Section 1003)

    SECURITY; RELEASE DATE.   Until  the Release  Date (as  defined below),  the
Senior  Notes  will be  secured by  one or  more series  of the  Company's first
mortgage bonds  ("Senior  Note Mortgage  Bonds")  issued and  delivered  by  the
Company  to the  Senior Note Trustee  (see "DESCRIPTION OF  SENIOR NOTE MORTGAGE
BONDS"). Upon the  issuance of a  series of  Senior Notes prior  to the  Release
Date,  the  Company will  simultaneously issue  and deliver  to the  Senior Note
Trustee, as security  for all  Senior Notes, a  series of  Senior Note  Mortgage
Bonds  that will  have the same  stated rate  or rates of  interest (or interest
calculated in the same manner), interest payment dates, stated maturity date and
redemption provisions, and will be in the same aggregate principal amount as the
series of the Senior Notes being issued. (Section 1301) The Company's obligation
to make payments of principal of, premium, if any, and interest on any series of
Senior Note Mortgage Bonds shall be fully satisfied by

                                       8
<PAGE>
making timely payments  of principal of,  premium, if any,  and interest on  the
related series of Senior Notes. Conversely, payment by the Company to the Senior
Note  Trustee of principal of, premium and  interest on, a series of Senior Note
Mortgage Bonds  will  be applied  by  the Senior  Note  Trustee to  satisfy  the
Company's obligations with respect to principal of, premium and interest on, the
Senior  Notes (Section  312). THE RELEASE  DATE WILL  BE THE DATE  CHOSEN BY THE
COMPANY WHICH MUST BE AFTER ALL FIRST MORTGAGE BONDS ("FIRST MORTGAGE BONDS") OF
THE COMPANY ISSUED  AND OUTSTANDING  UNDER THE FIRST  MORTGAGE INDENTURE  (OTHER
THAN  SENIOR NOTE  MORTGAGE BONDS)  HAVE BEEN RETIRED  (AT, BEFORE  OR AFTER THE
MATURITY THEREOF) THROUGH PAYMENT OR REDEMPTION (INCLUDING THOSE FIRST  MORTGAGE
BONDS  DEEMED TO BE PAID WITHIN THE MEANING OF THE FIRST MORTGAGE INDENTURE). ON
THE RELEASE  DATE, THE  SENIOR NOTE  TRUSTEE  WILL DELIVER  TO THE  COMPANY  FOR
CANCELLATION  ALL  SENIOR NOTE  MORTGAGE BONDS  AND THE  COMPANY WILL  CAUSE THE
SENIOR NOTE TRUSTEE  TO PROVIDE NOTICE  TO ALL  HOLDERS OF SENIOR  NOTES OF  THE
OCCURRENCE  OF THE RELEASE DATE.  AS A RESULT, FROM  AND AFTER THE RELEASE DATE,
THE SENIOR NOTE MORTGAGE BONDS SHALL CEASE  TO SECURE THE SENIOR NOTES, AND  THE
SENIOR  NOTES WILL BECOME UNSECURED GENERAL OBLIGATIONS OF THE COMPANY. (Section
1310) Each  series of  Senior Note  Mortgage Bonds  will be  a series  of  First
Mortgage  Bonds  of the  Company,  all of  which are  secured  by a  mortgage on
substantially all of the property owned by the Company. In certain circumstances
prior to the  Release Date,  the Company is  permitted to  reduce the  aggregate
principal  amount of a series  of Senior Note Mortgage  Bonds held by the Senior
Note Trustee, but in no event to an amount lower than the aggregate  outstanding
principal   amount   of   the   series   of   Senior   Notes   initially  issued
contemporaneously with such Senior Note Mortgage Bonds. (Section 1308) Following
the Release Date,  the Company  will cause the  First Mortgage  Indenture to  be
closed  and the Company will not issue any additional First Mortgage Bonds under
the First Mortgage Indenture. (Section 1310) While the Company will be precluded
after the Release Date from issuing additional First Mortgage Bonds, the Company
will not  be precluded  under the  Senior Note  Indenture or  Senior Notes  from
issuing  or assuming  other secured  debt, or  incurring liens  on its property,
unless otherwise indicated in the applicable Prospectus Supplement.

    CONSOLIDATION, MERGER, CONVEYANCE, SALE OR  TRANSFER.  Nothing contained  in
the  Senior  Note  Indenture prevents  the  Company from  consolidating  with or
merging into another corporation or conveying, selling or otherwise transferring
its properties and assets substantially as  an entirety to any Person,  provided
that  the corporation formed by such consolidation  or into which the Company is
merged or  the  Person  which  acquires by  conveyance,  sale  or  transfer  the
properties  and assets  of the  Company substantially  as an  entirety expressly
assumes (i) by an indenture supplemental thereto, executed and delivered to  the
Senior Note Trustee under the Senior Note Indenture, in form satisfactory to the
Senior  Note Trustee,  the due  and punctual  payment of  the principal  of (and
premium, if  any)  and  interest, if  any,  on  all the  Senior  Notes  and  the
performance  of every covenant of  the Senior Note Indenture  on the part of the
Company to be  performed or observed,  and (ii) if  such consolidation,  merger,
conveyance,  sale or transfer occurs prior to  the Release Date, by an indenture
supplemental to  the First  Mortgage Indenture,  executed and  delivered to  the
Senior  Note Trustee and the First Mortgage Trustee, in form satisfactory to the
Senior Note Trustee and the First Mortgage Trustee, the due and punctual payment
of the principal of (and premium, if any) and interest on all of the Senior Note
Mortgage Bonds  and the  performance of  every covenant  of the  First  Mortgage
Indenture on the part of the Company to be performed or observed.

    LIMITATION  ON LIENS.  Nothing contained in  the Senior Note Indenture or in
the Senior Notes in any way restricts or prevents the Company or any  subsidiary
from  incurring  any  indebtedness;  provided  that  if  this  covenant  is made
applicable to the Senior Notes of  any particular series, the Company will  not,
and  will not permit  any subsidiary to,  issue, assume or  guarantee any notes,
bonds, debentures or other similar evidences of indebtedness for money  borrowed
("Debt")  secured  by  a  mortgage, lien,  pledge,  security  interest  or other
encumbrance ("Mortgage") upon  any property without  effectively providing  that
the   outstanding   Senior   Notes   (together   with,   if   the   Company   so

                                       9
<PAGE>
determines, any other  indebtedness or  obligation then  existing or  thereafter
created  ranking equally  with the  Senior Notes)  shall be  secured equally and
ratably with (or prior to) such Debt so  long as such Debt shall be so  secured.
This  restriction will not, however, apply to  (a) Mortgages in existence on the
date of the original issue of the Senior Notes to which this restriction is made
applicable (including without limitation any  obligations issued or incurred  or
to  be issued  or incurred  under the  First Mortgage  Indenture); (b) Mortgages
created solely for the purpose of  securing Debt incurred to finance,  refinance
or  refund the purchase  price or cost  (including the cost  of construction) of
property  acquired  after  the  date   hereof  (by  purchase,  construction   or
otherwise),  or  Mortgages  in  favor  of  guarantors  of  obligations  or  Debt
representing, or incurred to finance,  refinance or refund, such purchase  price
or  cost, provided that no  such Mortgage shall extend  to or cover any property
other than  the property  so acquired  and improvements  thereon; (c)  Mortgages
which  secure only indebtedness owing by a  subsidiary to the Company, to one or
more subsidiaries, or to the Company and one or more subsidiaries; (d) Mortgages
on any property or assets  acquired from a corporation  which is merged with  or
into  the Company or any subsidiary, or  any Mortgages on the property or assets
of any corporation  or other  entity existing at  the time  such corporation  or
other  entity becomes a subsidiary and, in either such case, is not created as a
result of  or in  connection with  or in  anticipation of  any such  transaction
(unless  such Mortgage was created  to secure or provide  for the payment of any
part of  the  purchase price  of  such corporation);  (e)  any Mortgage  on  any
property  or assets existing at the time of acquisition thereof and which is not
created as  a  result of  or  in connection  with  or in  anticipation  of  such
acquisition  (unless  such Mortgage  was created  to secure  or provide  for the
payment of any part of  the purchase price of such  property or assets); or  (f)
any  extension,  renewal  or replacement  of  any  Mortgage referred  to  in the
foregoing clauses (a) through (e), provided that the principal amount of Debt so
secured thereby shall not exceed the principal amount of Debt so secured at  the
time of such extension, renewal or replacement, and that such extension, renewal
or  replacement Mortgage shall  be limited to  all or part  of substantially the
same property which  secured the  Mortgage extended, renewed  or replaced  (plus
improvements  on such property). Notwithstanding  the foregoing, the Company and
one or  more  subsidiaries  may  issue, assume  or  guarantee  Debt  secured  by
Mortgages  which would otherwise be subject  to the foregoing restrictions in an
aggregate principal  amount  which,  together  with  the  aggregate  outstanding
principal  amount of  all other  Debt of  the Company  which would  otherwise be
subject to  the  foregoing restrictions  (not  including Debt  permitted  to  be
secured  under clauses (a) through (f) above)  does not at the time of issuance,
assumption or guarantee thereof exceed ten  percent of the Net Tangible  Assets,
which is defined as the total of all assets (including revaluations thereof as a
result of commercial appraisals, price level restatement or otherwise) appearing
on  a  balance sheet  of the  Company  and its  subsidiaries, net  of applicable
reserves and  deductions,  but  excluding  goodwill,  trade  names,  trademarks,
patents,  unamortized debt discount and all  other like intangible assets (which
term shall not be construed to include such revaluations), less the aggregate of
the current liabilities of  the Company and its  subsidiaries appearing on  such
balance  sheet. The following types of  transactions, among others, shall not be
deemed to create Debt secured by  Mortgages: Mortgages required by any  contract
or  statute  in order  to  permit the  Company or  a  subsidiary to  perform any
contract or subcontract  made by it  with or  at the request  of a  governmental
entity  or  any  department, agency  or  instrumentality thereof,  or  to secure
partial, progress,  advance  or  any  other  payments  to  the  Company  or  any
subsidiary  by such governmental unit pursuant to the provisions of any contract
or statute. (Section 1007)

    MODIFICATION OF  THE  SENIOR NOTE  INDENTURE.   The  Senior  Note  Indenture
contains provisions permitting the Company and the Senior Note Trustee, with the
consent  of  the  holders  of not  less  than  50% in  principal  amount  of the
outstanding Senior Notes, of all series affected by the modification (voting  as
one class), to modify the Senior Note Indenture or any supplemental indenture or
the  rights of the holders of the Senior  Notes of such series; provided that no
such modification shall without the consent  of the holders of each  outstanding
Senior  Note affected thereby (a) change the fixed date upon which the principal
of or  the interest  on  any Senior  Note  is due  and  payable, or  reduce  the
principal  amount thereof or the rate of interest thereon or any premium payable
upon the  redemption  thereof, or  reduce  the amount  of  the principal  of  an
Original Issue Discount Security that would be payable

                                       10
<PAGE>
upon  a declaration of acceleration of the maturity thereof, or change any place
of payment where, or the  currency in which, any Senior  Note or any premium  or
the  interest thereon is payable, or impair  the right to institute suit for the
enforcement of any payment on or after the date such payment is due (or, in  the
case  of  redemption,  on or  after  the  date fixed  for  such  redemption (the
"Redemption Date")), or impair  the interest of the  Senior Note Trustee in  the
Senior  Note Mortgage Bonds, or prior to  the Release Date, reduce the principal
amount of any series of  Senior Note Mortgage Bonds to  an amount less than  the
principal  amount of  the related  series of Senior  Notes or  alter the payment
provisions of such Senior Note Mortgage Bonds in a manner adverse to the Holders
of the Senior Notes, or (b) reduce the aforesaid percentage of Senior Notes, the
consent of  the  holders  of which  is  required  for any  modification  of  the
applicable  Senior Note  Indenture or  for waiver by  the holders  of certain of
their rights or  (c) modify  certain provisions  of the  Senior Note  Indenture.
(Section   902)  An  Original   Issue  Discount  Security   means  any  security
authenticated and delivered under the  Senior Note Indenture which provides  for
an  amount less than the principal amount thereof to be due and payable upon the
declaration of acceleration of the maturity thereof.

    The Senior Note  Indenture also contains  provisions permitting the  Company
and  the  Senior Note  Trustee to  amend  the Senior  Note Indenture  in certain
circumstances without the consent of the holders of any Senior Notes to evidence
the merger of the Company,  the replacement of the  Senior Note Trustee and  for
certain other purposes.

    EVENTS  OF DEFAULT.  An Event of Default with respect to the Senior Notes is
defined in the Senior Note Indenture as being: default for 30 days in payment of
any interest  of  the  Senior  Notes;  default for  three  days  in  payment  of
principal,  including the  payment of  principal (or  premium, if  any) when due
pursuant to  any  redemption provision  of  the  Senior Notes;  default  in  the
performance, or breach, of any covenant or warranty of the Company in the Senior
Note Indenture and continuance of such default or breach for a period of 90 days
after  written notice is given  to the Company by the  Senior Note Trustee or to
the Company and the Senior Note Trustee by the holders of 33 percent or more  in
aggregate  principal amount of  the Senior Notes;  prior to the  Release Date, a
"default" as defined in the First Mortgage Indenture and the continuance of such
default after written notice is  given to the Senior  Note Trustee by the  First
Mortgage  Trustee, the  Company or  holders of 33  percent or  more in aggregate
principal amount  of  the  Senior  Notes;  and  certain  events  of  bankruptcy,
insolvency,  reorganization, receivership or  liquidation involving the Company.
(Section 501) The Company will be required to file with the Senior Note  Trustee
annually an officers' certificate as to the absence of default in performance of
certain  covenants in the Senior Note Indenture,  and will be required to notify
the Senior  Note  Trustee of  the  occurrence of  any  default under  the  First
Mortgage  Indenture. (Section 1009) The Senior  Note Indenture provides that the
Senior Note Trustee may withhold  notice to the holders  of the Senior Notes  of
any default (except in payment of principal of, or interest on, the Senior Notes
or  in the payment  of any sinking  fund installment with  respect to the Senior
Notes) if the Senior  Note Trustee in  good faith determines that  it is in  the
interest  of the holders of the Senior Notes  to do so. (Section 602) The Senior
Note Indenture provides that, if an Event of Default with respect to the  Senior
Notes specified therein shall have happened and be continuing, either the Senior
Note  Trustee or the holders of 33 percent or more in aggregate principal amount
of the Senior Notes may declare the principal amount of all the Senior Notes  to
be  due and payable immediately, but if  the Company shall cure all defaults and
certain other conditions  are met,  such declaration  may be  annulled and  past
defaults  may be  waived by  the holders  of a  majority in  aggregate principal
amount of the Senior Notes. (Section  502) Upon the Senior Notes being  declared
to  be or becoming due and payable, the Senior Note Trustee can immediately file
with the First Mortgage  Trustee a written demand  for redemption of all  Senior
Note  Mortgage Bonds pursuant  to the applicable  provisions of the supplemental
indenture to the First Mortgage Indenture. (Section 502)

    Subject to  the provisions  of the  Senior Note  Indenture relating  to  the
duties  of the  Senior Note Trustee,  the Senior  Note Trustee will  be under no
obligation to  exercise  any of  its  rights or  powers  under the  Senior  Note
Indenture at the request or direction of any of the holders of the Senior Notes,
unless  such holders  shall have offered  to the Senior  Note Trustee reasonable
indemnity. (Section 603)

                                       11
<PAGE>
Subject to such  provision for  indemnification, the  holders of  a majority  in
principal  amount of the  Senior Notes will  have the right  to direct the time,
method and place of  conducting any proceeding for  any remedy available to  the
Senior  Note Trustee, or exercising  any trust or power  conferred on the Senior
Note Trustee with  respect to the  Senior Notes, provided  that the Senior  Note
Trustee  shall have  the right to  decline to  follow any such  direction if the
Senior Note Trustee shall determine that  the action so directed conflicts  with
any  law or the  provisions of the Senior  Note Indenture or  if the Senior Note
Trustee shall determine  that such action  would be prejudicial  to holders  not
taking part in such direction. (Section 512)

    DEFEASANCE.  The Company, at its option, (a) will be Discharged from any and
all  obligations in respect of the Senior Notes (except in each case for certain
obligations to  register  the transfer  or  exchange of  Senior  Notes,  replace
stolen, lost or mutilated Senior Notes, maintain paying agencies and hold moneys
for  payment in  trust) or  (b) need  not comply  with certain  covenants of the
Senior Note  Indenture described  under "--  Consolidation, Merger,  Conveyance,
Sale or Transfer" and, "-- Limitation of Liens" or to certain covenants relating
to  corporate existence  and maintenance  of properties  and insurance,  in each
case, if (1) the Company irrevocably  deposits with the Senior Note Trustee,  in
trust, (i) money or (ii) in certain cases, (A) U.S. Government Obligations which
through  the payment of interest and  principal in respect thereof in accordance
with their terms will provide money in an amount, or (B) a combination  thereof,
in  each case sufficient to pay and discharge (x) the principal of (and premium,
if any) and each installment of principal (and premium, if any) and interest, if
any, on the  outstanding Senior Notes  on the  dates such payments  are due,  in
accordance  with  the  terms  of  the Senior  Notes,  or  to  and  including the
Redemption Date  irrevocably designated  by the  Company pursuant  to the  final
sentence  of this section and (y) any mandatory sinking fund payments applicable
to the  Senior Notes  on  the day  on  which payments  are  due and  payable  in
accordance  with the terms of the Senior Note Indenture and of the Senior Notes;
(2) no Event of Default or event which with notice or lapse of time would become
an Event of Default (including  by reason of such  deposit) with respect to  the
Senior  Notes shall have occurred and be continuing on the date of such deposit;
(3) the Company delivers to the Senior Note Trustee an opinion of counsel to the
effect (i) that the holders will not recognize income, gain or loss for  Federal
income  tax  purposes as  a result  of  such deposit  and defeasance  of certain
obligations; (ii) that  such provision  would not cause  any outstanding  Senior
Notes then listed on any national securities exchange to be delisted as a result
thereof;  and (iii) that  the defeasance trust  is not, or  is registered as, an
investment company under the Investment Company Act of 1940; and (4) the Company
has delivered to the Senior Note Trustee an officers' certificate and an opinion
of counsel,  each stating  that all  conditions precedent  provided for  in  the
Senior  Note Indenture relating to the  satisfaction and discharge of the Senior
Notes have  been complied  with.  (Sections 403,  1010) Discharged  means,  with
respect   to  the  Senior  Notes,  the  discharge  of  the  entire  indebtedness
represented by, and obligations  of the Company under,  the Senior Notes and  in
the  satisfaction of all  the obligations of  the Company under  the Senior Note
Indenture relating to the Senior Notes, except (A) the rights of holders of  the
Senior  Notes to receive, from the trust fund established pursuant to the Senior
Note Indenture, payment of the principal of and interest and premium, if any, on
the Senior Notes when such payments are due, (B) the Company's obligations  with
respect to the Senior Notes with respect to registration, transfer, exchange and
maintenance  of a place of  payment and (C) the  rights, powers, trusts, duties,
protections and immunities  of the  Senior Note  Trustee under  the Senior  Note
Indenture.  (Section 101) If the Company has deposited or caused to be deposited
money or U.S. Government Obligations to  pay or discharge the principal of  (and
premium,  if any) and interest,  if any, on the  outstanding Senior Notes to and
including a Redemption Date on which all of the outstanding Senior Notes are  to
be  redeemed, such Redemption Date shall be irrevocably designated by a Board of
Directors resolution delivered  to the Senior  Note Trustee on  or prior to  the
date  of deposit of such money or U.S. Government Obligations, and such Board of
Directors resolution shall be accompanied by an irrevocable Company request that
the Senior Note Trustee give  notice of such redemption in  the name and at  the
expense  of the Company  not less than  30 nor more  than 60 days  prior to such
Redemption Date in  accordance with  the Senior Note  Indenture. (Sections  403,
1010)  U.S.  Government  Obligations  means  direct  obligations  of  the United

                                       12
<PAGE>
States for  the payment  of  which its  full faith  and  credit is  pledged,  or
obligations  of a person controlled or supervised  by and acting as an agency or
instrumentality of the United States and the payment of which is unconditionally
guaranteed by the  United States, and  shall also include  a depositary  receipt
issued  by a bank  or trust company as  custodian with respect  to any such U.S.
Government Obligation or a specific payment  of interest on or principal of  any
such  U.S. Government  Obligation held  by such custodian  for the  account of a
holder of a depositary receipt; provided  that (except as required by law)  such
custodian is not authorized to make any deduction from the amount payable to the
holder  of such depositary receipt from any  amount received by the custodian in
respect of the U.S. Government Obligation or the specific payment of interest on
or principal  of the  U.S. Government  Obligation evidenced  by such  depositary
receipt. (Section 101)

    VOTING  OF SENIOR  NOTE MORTGAGE  BONDS HELD  BY SENIOR  NOTE TRUSTEE.   The
Senior Note Trustee, as a holder of Senior Note Mortgage Bonds, will attend  any
meeting  of  bondholders  under the  First  Mortgage  Indenture as  to  which it
receives due notice,  or, at its  option, will deliver  its proxy in  connection
therewith.  Either at such meeting, or otherwise where the consent of holders of
first mortgage bonds issued under the First Mortgage Indenture is sought without
a meeting, the Senior  Note Trustee will  vote all of  the Senior Note  Mortgage
Bonds  held by  it, or  will consent  with respect  thereto, as  directed by the
holders of  not  less than  a  majority in  aggregate  principal amount  of  the
outstanding  Senior Notes;  provided, however, the  Senior Note  Trustee may not
vote the Senior Note  Mortgage Bonds of  any particular series  in favor of,  or
give  consent to, any action which, in  the Senior Note Trustee's opinion, would
materially adversely  affect such  series of  Senior Note  Mortgage Bonds  in  a
manner  not shared  generally by  all other  Senior Mortgage  Bonds, except upon
notification by the Senior Note Trustee to the holders of the related series  of
Senior  Notes of such proposal and consent  thereto of the holders of a majority
in principal amount  of the outstanding  Senior Notes of  such series.  (Section
1303)

    RESIGNATION  OR REMOVAL OF SENIOR NOTE TRUSTEE.  The Senior Note Trustee may
resign at any time upon  written notice to the  Company specifying the day  upon
which  the resignation is to  take effect and such  resignation will take effect
immediately upon the later of the appointment of a successor Senior Note Trustee
and such specified day. (Section 610)

    The Senior Note  Trustee may  be removed  at any  time by  an instrument  or
concurrent  instruments in writing delivered to  the Senior Note Trustee and the
Company and signed  by the holders,  or their attorneys-in-fact,  of at least  a
majority  in principal amount of the then outstanding Senior Notes. In addition,
under certain circumstances, the Company may remove the Senior Note Trustee upon
notice to  the  holder of  each  Senior Note  outstanding  and the  Senior  Note
Trustee, and appointment of a successor Senior Note Trustee. (Section 610)

    NO  RECOURSE AGAINST  OTHERS.   The Senior  Note Indenture  provides that no
recourse for the payment of the principal  of or any premium or interest on  any
Security  or any Senior  Note Mortgage Bond,  or for any  claim based thereon or
otherwise in respect  thereof, and  no recourse  under or  upon any  obligation,
covenant  or agreement of the Company, contained in the Senior Note Indenture or
the First Mortgage Indenture or in any supplemental indenture, or in any  Senior
Note  or  any Senior  Note  Mortgage Bond,  or because  of  the creation  of any
indebtedness  represented  thereby,  will  be  had  against  any   incorporator,
stockholder,  officer  or director,  as  such, past,  present  or future  of the
Company or any successor corporation, either directly or through the Company  or
any  successor corporation,  whether by virtue  of any  constitution, statute or
rule of law, or by the enforcement of any assessment or penalty or otherwise; it
being expressly  understood that  all  such liability  is expressly  waived  and
released  as a  condition of,  and in  consideration for,  the execution  of the
Senior Note Indenture and the issuance of the Senior Notes. Such waiver may  not
be  effective to waive liabilities  under the Federal securities  laws and it is
the view of the Commission that such a waiver is against public policy.

                                       13
<PAGE>
                       CONCERNING THE SENIOR NOTE TRUSTEE

    Liberty Bank and Trust Company of Tulsa, National Association is the  Senior
Note  Trustee under  the Senior  Note Indenture.  The Company  maintains banking
relationships with the Senior Note Trustee  in the ordinary course of  business.
The  Senior Note Trustee also  acts as trustee for  the Company's First Mortgage
Bonds.

                   DESCRIPTION OF SENIOR NOTE MORTGAGE BONDS

    First Mortgage Bonds,  including any  series of Senior  Note Mortgage  Bonds
issued  as security for the  Senior Notes, will be issued  in one or more series
under the Company's First Mortgage Indenture.

    The following statements, unless the context otherwise indicates, are  brief
summaries of certain provisions of the First Mortgage Indenture. Such statements
make  use  of  defined  terms, are  not  complete  and are  subject  to  all the
provisions of the First Mortgage Indenture.  The First Mortgage Indenture is  in
part  filed as  an exhibit  to, and  in part  incorporated by  reference in, the
Registration Statement of which this Prospectus is a part.

    GENERAL.  Senior Note  Mortgage Bonds will be  issuable in definitive  fully
registered  form  without coupons,  in denominations  of  $1,000 or  in integral
multiples thereof. Principal, premium, if any,  and interest on the Senior  Note
Mortgage  Bonds will be  payable at the office  or agency of  the Company in the
City of  New  York, State  of  New York.  The  Senior Note  Mortgage  Bonds  are
exchangeable  and transferable as  provided in the  First Mortgage Indenture and
without charge therefor, except for any stamp tax or other governmental  charge;
provided,  that the Company (a) shall  not register, exchange or transfer Senior
Note Mortgage Bonds  during the  ten days  preceding any  interest payment  date
thereof  and (b) shall not be required  to register, exchange or transfer Senior
Note Mortgage Bonds during the period beginning ten days preceding any date  for
selection  of Senior Note Mortgage Bonds to  be called for redemption and ending
on the date of the giving of the relevant notice of redemption and, as to Senior
Note Mortgage Bonds  selected for redemption,  from and after  the date of  such
selection.

    DEBT RETIREMENT.  The Debt Retirement provisions, if any, for each series of
Senior  Note  Mortgage  Bonds will  be  described in  the  Prospectus Supplement
relating thereto. First Mortgage  Bonds of Series J,  K and L outstanding  under
the First Mortgage Indenture on the date of this Prospectus provide that, during
each 12-month period specified in the First Mortgage Indenture, the Company will
(a)  retire, or pay to  the First Mortgage Trustee a  sum of money sufficient to
redeem and retire,  1% of the  greatest principal amount  of the First  Mortgage
Bonds  of such series outstanding at any time between the end of such period and
the day before the date of the Supplemental Indenture relating to such series of
First Mortgage Bonds (the  "Supplemental Indenture Date") or  (b) to the  extent
that  First  Mortgage  Bonds  of such  series  are  not so  retired  or  cash so
deposited, make  and certify  to the  First Mortgage  Trustee $1,666.67  of  net
expenditures  for bondable property  on which the First  Mortgage Indenture is a
first lien, subject only to permitted encumbrances and liens and prepaid  liens,
for  each $1,000 of First Mortgage Bonds of such series otherwise required to be
retired. Unused net expenditures for bondable  property and, as applied to  each
such series of First Mortgage Bonds, unused excess retirements of First Mortgage
Bonds of that series, may be used to satisfy the foregoing provisions.

    MAINTENANCE AND RENEWAL.  The First Mortgage Indenture provides that so long
as  there are outstanding any  First Mortgage Bonds of  a series issued prior to
Series N, the Company will expend during each calendar year, and certify to  the
First Mortgage Trustee, an amount equal to at least 15% of its utility operating
revenues  for  such  year,  after  deducting from  such  revenues  the  costs of
electricity purchased for  resale, for  (1) the  maintenance and  repair of  its
mortgaged  utility properties, (2)  the construction or  acquisition of bondable
property on which the First Mortgage Indenture is a first lien, subject only  to
permitted  encumbrances  and liens  and prepaid  liens,  or (3)  the retirement,
through purchase or  payment, of  First Mortgage  Bonds issued  under the  First
Mortgage Indenture, or redemption of First Mortgage Bonds issued under the First
Mortgage Indenture that are subject to

                                       14
<PAGE>
redemption;  and that, so long as any First Mortgage Bonds of Series F through M
are outstanding, the expenditures to be made for the purposes stated in  clauses
(2)  and (3) must equal at least 2 1/4% (unless modified upon application to the
Commission) of the average amount of depreciable property of the Company. At any
time when no First Mortgage Bonds of  such prior series are outstanding, but  so
long  as  First  Mortgage Bonds  of  Series  N through  W  are  outstanding, the
Indenture requires  that  expenditures of  at  least 3%  (unless  modified  upon
application  to the  Commission) of the  average amount  of bondable depreciable
property be made for the purposes stated in clauses (2) and (3). If the required
expenditures for  the foregoing  purposes are  not so  made, the  Company  shall
deposit  with the First Mortgage  Trustee cash to the  extent of any deficiency,
after deducting  (subject to  the terms  of the  First Mortgage  Indenture)  any
eligible  credit  for  unused  excess  expenditures  previously  made  for  such
purposes. Such cash may be applied  to the redemption at the applicable  General
Redemption  Price or to the  repurchase of First Mortgage  Bonds or withdrawn to
the extent of 100% of either  net expenditures or excess gross expenditures  for
such bondable property.

    The  First  Mortgage  Indenture also  provides  that (a)  the  Company shall
maintain the mortgaged properties in  good repair, working order and  condition,
(b) the First Mortgage Trustee may, and if requested by holders of a majority in
principal  amount of  all outstanding  First Mortgage  Bonds and  furnished with
funds therefor shall, cause  such properties to be  inspected by an  independent
engineer  (not more often than at five-year intervals) to determine whether they
have been so maintained and whether  any property, not retired on the  Company's
books,  should  be  classified  as  retired for  the  purpose  of  computing net
expenditures for  bondable  property  or  otherwise  under  the  First  Mortgage
Indenture,  and (c)  the Company shall  make good any  deficiency in maintenance
disclosed by such engineer's report as rendered or as modified by arbitration.

    SECURITY.  The Senior Note Mortgage Bonds  of any series will be secured  by
the  lien of the First  Mortgage Indenture and will  rank equally with all First
Mortgage Bonds at any time outstanding  under and secured by the First  Mortgage
Indenture,  except  as  to differences  between  series permitted  by  the First
Mortgage Indenture and not  affecting the rank of  the lien. The First  Mortgage
Indenture  will  constitute a  first mortgage  lien,  subject only  to permitted
encumbrances and  liens and  prepaid  liens, on  all  or substantially  all  the
permanent  fixed properties, other than excepted property, owned by the Company.
The First  Mortgage  Indenture  contains  provisions  subjecting  after-acquired
property, other than excepted property, to the lien thereof. Such provisions may
not be effective as to property or proceeds acquired subsequent to the filing of
any  case under the  Bankruptcy Code. The First  Mortgage Indenture excepts from
the lien thereof all cash, securities, accounts and bills receivable, choses  in
action and certain judgments not deposited with, assigned to or pledged with the
First  Mortgage Trustee, all tangible personal property held for sale, rental or
consumption in the ordinary course of business, the last day of each term  under
any  lease  of property,  all  oil, gas  and  mineral leaseholds,  interests and
estates, gas gathering lines and certain real estate described therein.

    ISSUANCE OF ADDITIONAL FIRST MORTGAGE  BONDS.  The First Mortgage  Indenture
provides  that the  aggregate principal  amount of  First Mortgage  Bonds of all
series that  may be  outstanding thereunder  at any  one time  shall not  exceed
$600,000,000.  Such amount may be  increased from time to  time by action of the
Board of Directors and the stockholder of  the Company as provided in the  First
Mortgage  Indenture. An aggregate  of $380,000,000 in  principal amount of First
Mortgage Bonds was outstanding under the Indenture on January 31, 1996.

    Additional First Mortgage  Bonds, of  a new or  an existing  series, may  be
issued  from time  to time  under the First  Mortgage Indenture,  subject to the
terms thereof,  in  a  principal  amount  equal to:  (a)  60%  of  eligible  net
expenditures  made by the Company for  bondable property constructed or acquired
by it on or after July 1, 1945,  and on which the First Mortgage Indenture is  a
first  lien, subject only to permitted encumbrances and liens and prepaid liens,
(b) the principal amount of First Mortgage Bonds previously authenticated  under
the  First Mortgage Indenture and which have  been retired or for the retirement
of which the First Mortgage Trustee holds the necessary funds, other than  First
Mortgage  Bonds  made ineligible  for  the purpose  by  the terms  of  the First
Mortgage Indenture (which First Mortgage Bonds so made ineligible include  First
Mortgage Bonds retired

                                       15
<PAGE>
through  the operation  of the debt  retirement and the  maintenance and renewal
provisions of  the  First Mortgage  Indenture),  and  (c) the  amount  of  money
deposited  with the First Mortgage  Trustee for the purpose,  which money may be
applied to the retirement of First Mortgage Bonds or may be withdrawn in lieu of
authentication of an equivalent principal  amount of First Mortgage Bonds  under
the  First Mortgage Indenture provisions referred to in clauses (a) and (b). Net
expenditures for  bondable property  are  determined as  provided in  the  First
Mortgage  Indenture.  In general,  bondable property,  the net  expenditures for
which are eligible as a basis  for issuance of additional First Mortgage  Bonds,
means  any electric utility plant, property or equipment owned by the Company on
July 1, 1945, or constructed  or acquired by it on  or after that date which  is
used or useful in its utility business and which the Company has lawful power to
own and operate.

    No  additional First  Mortgage Bonds  may be  authenticated under  the First
Mortgage Indenture provisions referred to in  clauses (a) and (c) above, and  no
First  Mortgage Bonds bearing a higher rate  of interest than the First Mortgage
Bonds for the retirement  of which they  are to be  issued may be  authenticated
under  the First Mortgage Indenture provisions  referred to in clause (b) above,
more than five years before maturity of the First Mortgage Bonds to be  retired,
unless,  in each case, net earnings of  the Company for a 12-month period ending
within 90 days preceding  such authentication were at  least equal to twice  the
interest for one year on (1) all of the First Mortgage Bonds of all series to be
outstanding   under  the   First  Mortgage  Indenture   immediately  after  such
authentication, other than First Mortgage Bonds for the retirement of which  the
First Mortgage Trustee holds the necessary funds, and (2) all other indebtedness
then  secured  by a  lien  equal or  prior to  the  First Mortgage  Indenture on
property of the  Company, except any  of such indebtedness  then held in  pledge
under  such lien or by the First  Mortgage Trustee and except prepaid liens. Net
earnings for the period in question are determined by deducting from total gross
earnings and income all operating expenses for the period, including taxes other
than income  taxes, rentals  and insurance  and all  charges or  provisions  for
maintenance   and   repairs   and  for   depreciation,   retirements,  renewals,
replacements and  amortization,  provided  that  charges  or  provisions  to  be
deducted  for such purposes shall  aggregate at least the  amount required to be
certified in connection with  the maintenance and renewal  fund under the  First
Mortgage  Indenture, described under  "Maintenance and Renewal"  above. Such net
earnings are  also subject  to any  adjustment required  by the  First  Mortgage
Indenture.

    Based  on the bondable property test described above, which is currently the
most restrictive of the First  Mortgage Indenture's issuance tests, and  without
taking into account the retirement of any First Mortgage Bonds with the proceeds
of  the Senior Notes,  the Company, as  of December 31,  1995, could have issued
approximately $51,056,691 principal amount of additional First Mortgage Bonds.

    The Company  anticipates  that  the  Senior  Note  Mortgage  Bonds  will  be
authenticated  under the First Mortgage Indenture against retired First Mortgage
Bonds  of  prior  series,  to  the  extent  available,  or  against  unused  net
expenditures for bondable property to the extent permitted in the First Mortgage
Indenture.  At December 31, 1995,  approximately $80,700,000 principal amount of
previously retired First  Mortgage Bonds  were available  for authentication  of
additional  First  Mortgage Bonds  and such  unused net  expenditures aggregated
approximately $85,094,485.

    ACQUISITION OF  PROPERTY  SUBJECT TO  A  PRIOR  LIEN.   The  First  Mortgage
Indenture  provides that the Company will not acquire any property of a value in
excess of $500,000 which at the time  of acquisition is subject to a lien  equal
or  prior to the First Mortgage Indenture (other than permitted encumbrances and
liens and prepaid liens)  unless at that  time (a) the  principal amount of  all
outstanding obligations secured by such equal or prior lien shall not exceed 60%
of  the fair value of any bondable property so acquired and (b) the net earnings
derived from the  operations of such  property during a  12-month period  ending
within  90 days  immediately preceding such  acquisition were equal  to at least
twice the annual interest charge  on such obligations, except obligations  owned
by  the Company or obligations  for the retirement of  which funds are deposited
under such lien or with the First Mortgage Trustee.

                                       16
<PAGE>
    LIMITATIONS  OF DIVIDENDS ON COMMON  STOCK.  Dividend restrictions dependent
upon earned surplus are binding on the  Company so long as certain prior  series
of  the  Company's  First Mortgage  Bonds  are outstanding.  The  First Mortgage
Indenture provides in effect that, so long as any First Mortgage Bonds of Series
R or a prior series are outstanding,  the aggregate amount of all dividends  and
distributions  on the Common Stock of the  Company on and after the Supplemental
Indenture Date for  such series, except  dividends payable in  shares of  Common
Stock  of the Company or in cash  where concurrently with the payment thereof an
amount at  least equal  to  such dividends  is received  in  cash as  a  capital
contribution  or as the proceeds from the sale of Common Stock, shall not exceed
the sum  of (a)  the earned  surplus  of the  Company earned  on and  after  the
Supplemental  Indenture  Date for  such series,  (b) its  earned surplus  at the
Supplemental Indenture Date for such series,  and (c) such additional amount  as
may  be approved by the  Commission. In determining earned  surplus on and after
the Supplemental Indenture Date for such series for such purpose, deductions are
required to be  made for depreciation,  retirements, renewals, replacements  and
amortization  as required in computing net earnings  as set forth in the next to
last  sentence  of  the  third  paragraph  under  the  subheading  "Issuance  of
Additional First Mortgage Bonds" above.

    The  Indenture also provides in effect that, so long as First Mortgage Bonds
of Series  J through  M are  outstanding, dividends  or other  distributions  on
Common  Stock (other than in  stock) may be paid only  out of the surplus earned
during the  period  from  July  1,  1945,  to  the  date  of  such  dividend  or
distribution,  after  giving  effect  in  the  calculation  of  such  surplus to
expenditures for maintenance and repairs and provisions for depreciation of  the
mortgaged  properties during such period of at  least 15% of the Company's total
utility operating revenues for  the period, after  deducting from such  revenues
the cost of electricity purchased for resale; provided that so long as any First
Mortgage  Bonds  of Series  F  through M  are  outstanding, in  calculating such
surplus the total amounts expended for  bondable property and the retirement  of
First  Mortgage Bonds shall equal  not less than 2  1/4% (unless modified by the
Commission) of the average amount of depreciable property.

    MODIFICATIONS OF INDENTURE.  The First Mortgage Indenture may be amended, by
supplemental indenture without the consent of bondholders, for various  purposes
specified  therein, including  the making  of any  change in  the First Mortgage
Indenture effective  only with  respect to  First Mortgage  Bonds  authenticated
after the execution of such supplemental indenture and only if such change would
not  adversely affect First  Mortgage Bonds then outstanding,  and the making of
any other change not inconsistent with the terms, and which would not impair the
security of the  First Mortgage Indenture.  The Supplemental Indenture  creating
the  First  Mortgage Bonds  of Series  M amended  the First  Mortgage Indenture,
effective upon the retirement or redemption,  or the consent of the holders,  of
all  outstanding First Mortgage  Bonds of all  series issued prior  to the First
Mortgage Bonds of Series M, by providing that with the consent of the holders of
not less  than  66  2/3%  in  principal amount  of  First  Mortgage  Bonds  then
outstanding  under the First  Mortgage Indenture may be  amended in any respect,
except that without the consent of the holder of each outstanding First Mortgage
Bond affected thereby no  such amendment shall, among  other things, (i)  extend
the  time  for, reduce  or  otherwise affect  the terms  of  any payment  of the
principal or of interest or premium on any First Mortgage Bond, (ii) permit  the
creation  of any lien ranking prior to or on a parity with the lien of the First
Mortgage Indenture,  other than  permitted encumbrances  and liens  and  prepaid
liens,  (iii) reduce the percentage in  principal amount of First Mortgage Bonds
the consent of the  holders of which  is required for  any such amendment,  (iv)
impair  the right of any bondholder to institute suit for the enforcement of any
payment in respect of his First Mortgage Bonds or (v) deprive any  non-assenting
bondholders  of a lien upon the mortgaged property for the security of his First
Mortgage Bonds.

    HIGHLY LEVERAGED TRANSACTIONS.   Certain  provisions of  the First  Mortgage
Indenture  may  provide holders  of  the Senior  Note  Mortgage Bonds  with some
protection in the event of a highly leveraged transaction. These provisions  are
described  in more detail in this  Prospectus under the following headings under
"Description of Senior Note Mortgage Bonds":

                                       17
<PAGE>
           Security:   A description  of the  first mortgage  lien securing  the
       Senior Note Mortgage Bonds and the limited exceptions from the lien.

           Issuance  of  Additional  First  Mortgage Bonds:    A  description of
       limitations on the issuance of additional First Mortgage Bonds, including
       60% of eligible  net expenditures  for bondable  property, the  principal
       amount  of retired First Mortgage Bonds, or cash deposited with the First
       Mortgage Trustee, subject  to the applicability  of an earnings  coverage
       test.

           Limitations  on Dividends on Common Stock:  A description of dividend
       limitations applicable so long as  certain series of the Company's  First
       Mortgage Bonds are still outstanding.

           Modifications  of  Indenture:   An  explanation of  the circumstances
       under which  the  First Mortgage  Indenture  may be  modified,  including
       amendments  requiring either a 66 2/3% vote of outstanding First Mortgage
       Bonds or a unanimous vote.

    The First Mortgage Indenture also provides that any merger of the Company or
conveyance of all or substantially all of its property shall not impair the lien
of the First Mortgage Indenture. Any  successor to the Company shall assume  the
obligations of the Company under the First Mortgage Indenture.

    Additionally, any change in control transaction that involves the incurrence
of  additional  long-term  indebtedness  (as  notes,  first  mortgage  bonds  or
otherwise) by the Company in such a transaction would require approval of  state
utility  regulatory  authorities and,  possibly,  of federal  utility regulatory
authorities. Management believes that  such approvals would  be unlikely in  any
transaction  that would result  in the Company,  or a successor  to the Company,
having a highly leveraged capital structure.

    DEFAULTS.  The First Mortgage Indenture  includes as events of default:  any
default  in payment  of principal  of any  First Mortgage  Bonds at  maturity or
otherwise; any default continued for 60 days in payment of interest thereon; any
default in payment of principal or interest on prior lien bonds continued beyond
any applicable  grace period;  any adjudication  of bankruptcy,  appointment  of
receiver,  filing of petition in voluntary bankruptcy or admission of insolvency
by or with respect to the Company;  and any default continued for 90 days  after
notice  from the First  Mortgage Trustee in  the performance of  any covenant or
condition in the First Mortgage Indenture or with respect to any prior lien. The
Company is required to give periodic certificates as to the absence of a default
and compliance with  the terms of  the First Mortgage  Indenture, and must  also
give  certificates  to  such effect  in  connection with  the  authentication of
additional First Mortgage Bonds or withdrawal  of cash under the First  Mortgage
Indenture.  The  First Mortgage  Trustee  is not  required  to take  action with
respect to a default except upon written request of the holders of not less than
a majority in  principal amount of  outstanding First Mortgage  Bonds under  the
First  Mortgage Indenture. No holder shall have  the right to exercise any right
in respect  of the  First  Mortgage Indenture,  unless  the Trustee  shall  have
refused  to  take action  requested by  holders  of 25%  in principal  amount of
outstanding First Mortgage Bonds under the First Mortgage Indenture and upon the
tender of security and indemnity satisfactory  to the Trustee against all  costs
and  liabilities which might be incurred by reason of the taking of such action.
The First  Mortgage  Indenture provides  that  the First  Mortgage  Trustee  may
withhold  notice  to  bondholders  of  any default  (except  in  payment  of the
principal of or interest  on any First  Mortgage Bonds or in  the making of  any
sinking  fund or similar payment) if it  considers such withholding to be in the
interest of bondholders.

                                 LEGAL OPINIONS

    Legal opinions relating to the validity of the Senior Notes will be given by
Milbank, Tweed, Hadley  & McCloy, 1  Chase Manhattan Plaza,  New York, New  York
10005, counsel for the Company,

                                       18
<PAGE>
and  Sidley & Austin, One First National Plaza, Chicago, Illinois 60603, counsel
for the Underwriters.  Sidley & Austin  has represented Central  and South  West
Corporation  and affiliates of  Central and South West  Corporation from time to
time in connection with certain legal matters.

                                    EXPERTS

    The audited financial statements and schedules incorporated by reference  in
this Prospectus and elsewhere in the Registration Statement have been audited by
Arthur  Andersen  LLP, independent  public  accountants, as  indicated  in their
report dated  February 13,  1995,  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 reports.

                              PLAN OF DISTRIBUTION

    The Company may sell the Senior Notes offered hereby (i) through negotiation
with one or more underwriters; (ii)  through one or more agents designated  from
time  to time; (iii) directly to purchasers;  or (iv) through any combination of
the above. The distribution  of the Senior  Notes may be  effected from time  to
time  in  one or  more transactions  at a  fixed  price or  prices which  may be
changed, at market prices prevailing at the  time of sale, at prices related  to
such  prevailing market prices or at  negotiated prices. A Prospectus Supplement
or a supplement thereto will describe  the method of distribution of the  Senior
Notes of any series.

    If an underwriter or underwriters are utilized in the sale, the Company will
execute  an underwriting agreement, distribution  agreement or similar agreement
with such  underwriters  prior  to the  time  of  sale, and  the  names  of  the
underwriters  of the transaction will be  set forth in the Prospectus Supplement
or a supplement thereto relating to  such sale. If an underwriting agreement  is
executed,  the Senior Notes 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 the sale. Unless otherwise indicated in
the Prospectus Supplement, the underwriting  or purchase agreement will  provide
that the underwriter or underwriters are obligated to purchase all of the Senior
Notes offered in the Prospectus Supplement if any are purchased.

    If any of the Senior Notes are sold through an agent or agents designated by
the Company from time to time, the Prospectus Supplement or a supplement thereto
will  name any such agent,  set forth any commissions  payable by the Company to
any such agent  and the obligations  of such  agent with respect  to the  Senior
Notes.  Unless otherwise indicated in the  Prospectus Supplement or a supplement
thereto, any such agent will be acting on a best efforts basis for the period of
its appointment.

    The Senior Notes of any series, when first issued, will have no  established
trading  market. Any underwriters or agents to  or through whom Senior Notes are
sold by the  Company for  public offering  and sale may  make a  market in  such
Senior Notes, but such underwriters or agents will not be obligated to do so and
may  discontinue any market making at any  time without notice. No assurance can
be given as to the liquidity of the trading market for any Senior Notes.

    In  connection  with  the  sale   of  the  Senior  Notes,  any   purchasers,
underwriters  or  agents  may  receive compensation  from  the  Company  or from
purchasers in the form of concessions or commissions. The underwriters will  be,
and  any agents and any dealers participating  in the distribution of the Senior
Notes may be, deemed to be underwriters within the meaning of the Securities Act
of 1933,  as amended  (the "Act").  The agreement  between the  Company and  any
purchasers,   underwriters  or  agents  will  contain  reciprocal  covenants  of
indemnity, and will provide  for contribution by the  Company in respect of  its
indemnity  obligations, between the Company and the purchasers, underwriters, or
agents against certain liabilities, including liabilities under the Act.

    Certain of the  underwriters or agents  and their associates  may engage  in
transactions  with, or perform  services for, the Company  and its affiliates in
the ordinary course of business.

                                       19
<PAGE>
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  NO  DEALER, SALESPERSON OR  ANY OTHER PERSON  HAS BEEN AUTHORIZED  TO GIVE ANY
INFORMATION, OR TO MAKE ANY REPRESENTATIONS, OTHER THAN THOSE CONTAINED IN  THIS
PROSPECTUS  SUPPLEMENT  OR  THE  PROSPECTUS  OR  THE  DOCUMENTS  INCORPORATED BY
REFERENCE THEREIN OR  HEREIN, IN  CONNECTION WITH  THE OFFER  CONTAINED IN  THIS
PROSPECTUS   SUPPLEMENT  AND  THE  PROSPECTUS,  AND,  IF  GIVEN  OR  MADE,  SUCH
INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED
BY THE COMPANY  OR BY  THE AGENTS. NEITHER  THIS PROSPECTUS  SUPPLEMENT NOR  THE
PROSPECTUS  CONSTITUTES AN OFFER OF ANY SECURITIES  OTHER THAN THOSE TO WHICH IT
RELATES OR AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, IN ANY  STATE
TO  ANY PERSON TO WHOM  IT IS NOT LAWFUL  TO MAKE SUCH OFFER  IN SUCH STATE. THE
DELIVERY OF THIS PROSPECTUS  SUPPLEMENT OR THE PROSPECTUS  AT ANY TIME DOES  NOT
IMPLY  THAT  THE INFORMATION  CONTAINED  IN EITHER  IS  CORRECT AS  OF  ANY TIME
SUBSEQUENT TO ITS DATE.

                                   ---------

                               TABLE OF CONTENTS

                             PROSPECTUS SUPPLEMENT

<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Recent Developments............................         S-2
Incorporation of Certain Documents by
 Reference.....................................         S-2
Description of the Notes.......................         S-2
Supplemental Plan of Distribution of the
 Notes.........................................         S-4

                         PROSPECTUS

Available Information..........................           2
Incorporation of Certain Documents by
 Reference.....................................           2
Prospectus Summary.............................           3
The Company....................................           5
Use of Proceeds................................           5
Description of Senior Notes....................           5
Concerning the Senior Note Trustee.............          14
Description of the Senior Note Mortgage
 Bonds.........................................          14
Legal Opinions.................................          18
Experts........................................          19
Plan of Distribution...........................          19
</TABLE>

                                  $75,000,000

                             PUBLIC SERVICE COMPANY
                                  OF OKLAHOMA

                          MEDIUM-TERM NOTES, SERIES A
                              DUE 9 MONTHS OR MORE
                               FROM DATE OF ISSUE

                                   ---------

                             PROSPECTUS SUPPLEMENT

                               FEBRUARY 26, 1996

                             (INCLUDING PROSPECTUS
                            DATED FEBRUARY 23, 1996)
                                   ---------

                               SMITH BARNEY INC.

                              MORGAN STANLEY & CO.
                                   INCORPORATED

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