PUBLIC SERVICE CO OF OKLAHOMA
S-3/A, 1997-04-02
ELECTRIC SERVICES
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    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON April 2, 1997
                              Registration No. 333-21153

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                              AMENDMENT NO. 1 TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

   PUBLIC SERVICE COMPANY OF OKLAHOMA             PSO CAPITAL I (333-21153-01 )
 (EXACT NAME OF REGISTRANT AS SPECIFIED          PSO CAPITAL II (333-21153-02 )
     IN CHARTER)                                  (EXACT NAMES OF REGISTRANTS
                                                      AS SPECIFIED IN TRUST
                                                           AGREEMENTS)
         OKLAHOMA                                           DELAWARE
(STATE OR OTHER JURISDICTION OF                 (STATE OR OTHER JURISDICTION OF
 INCORPORATION OR ORGANIZATION)                   INCORPORATION OR ORGANIZATION)
        73-0410895                                    EACH TO BE APPLIED FOR
(I.R.S. EMPLOYER IDENTIFICATION NO.)        (I.R.S. EMPLOYER IDENTIFICATION NO.)

                              212 EAST SIXTH STREET
                           TULSA, OKLAHOMA 74119-1212
                                 (918) 599-2000
                   (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE
                  NUMBER, INCLUDING AREA CODE, OF REGISTRANTS'
                          PRINCIPAL EXECUTIVE OFFICES)


T.D. CHURCHWELL                              ROBERT B. WILLIAMS, ESQ.
PRESIDENT                                    JORIS M. HOGAN, ESQ.
PUBLIC SERVICE COMPANY OF OKLAHOMA           MILBANK, TWEED, HADLEY & MCCLOY
212 EAST SIXTH STREET                        1 CHASE MANHATTAN PLAZA
TULSA, OKLAHOMA  74119-1212                  NEW YORK, NEW YORK  10005
(918) 599-2000                               (212) 530-5000


                   (NAMES, ADDRESSES, INCLUDING ZIP CODES, AND
               TELEPHONE NUMBERS, INCLUDING AREA CODES, OF AGENTS
                                  FOR SERVICE)


          APPROXIMATE DATE OF PROPOSED SALE TO THE PUBLIC: From time to time
after the effective date of the Registration Statement.

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

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

          If this Form is filed to register additional securities for an
offering pursuant to Rule 462(b) under the Securities Act of 1933, please check
the following box and list the Securities Act registration statement number of
the earlier effective registration statement for the same offering. |_|

          If this Form is a post-effective amendment filed pursuant to Rule
462(c) under the Securities Act of 1933, check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering. |_|

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




                         CALCULATION OF REGISTRATION FEE

=============================================================================
                                                       Proposed
                                          Proposed      maximum
                              Amount       maximum      aggregate    Amount of
Title of each class of         to be    offering price  offering    registration
securities being registered  registed    per unit (1)   price (1)     fee (2)
- - --------------------------- ----------  -------------- ----------- -----------

Public Service Company of
Oklahoma
Junior Subordinated
Deferrable Interest
Debentures


PSO Capital I
and II
Preferred Securities


Public Service Company of
Oklahoma
Guarantees with
respect to Preferred
Securities (3)(4)


Total                      $75,000,000       100%      $75,000,000     $22,728
                               (5)                         (5)           (6)
(1) Estimated solely for the purpose of computing the registration fee.

(2) The amount of the registration fee has been calculated in accordance with
    Rule 457(o) under the Securities Act of 1933.

(3) No separate consideration will be received for the Public Service Company of
    Oklahoma Guarantees.

(4) This Registration Statement is deemed to include the rights of holders of
    the Preferred Securities and the obligations of Public Service Company of
    Oklahoma ("Back-Up Obligations") under (i) the Guarantees, (ii) the Junior
    Subordinated Deferrable Interest Debentures (including Corresponding Junior
    Subordinated Deferrable Interest Debentures), (iii) the Trust Agreements for
    PSO Capital I and PSO Capital II, (iv) the Indenture and Supplemental
    Indentures under which the Junior Subordinated Deferrable Interest
    Debentures or Corresponding Junior Subordinated Deferrable Interest
    Debentures will be issued and (v) the Expense Agreements in which Public
    Service Company of Oklahoma undertakes to pay all of the expenses of PSO
    Capital I and PSO Capital II, except for obligations under the Preferred
    Securities, as described in this Registration Statement.

(5) Represents (a) the principal amount of the Junior Subordinated Deferrable
    Interest Debentures issued at their principal amount and (b) the initial
    public offering price of PSO Capital I and II Preferred Securities. No
    separate consideration will be received for any Public Service Company of
    Oklahoma Guarantees or Public Service Company of Oklahoma Junior
    Subordinated Deferrable Interest Debentures in connection with an issuance
    of Preferred Securities by PSO Capital I and II. The amount to be
    registered, the proposed maximum offering price per unit and the proposed
    maximum aggregate offering price for each class of securities being
    registered have been omitted in accordance with General Instruction II.D.
    of Form S-3.

(6)  A registration statement fee of $22,728 was previously paid on February 5,
     1997.

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


      THE REGISTRANTS HEREBY AMEND THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANTS
SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(A) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.
- --------------------------------------------------------------------------------
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. NEITHER THIS PROSPECTUS SUPPLEMENT NOR THE PROSPECTUS TO WHICH IT
RELATES SHALL CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO BUY
NOR SHALL THERE BE ANY SALE OF THESE SECURITIES IN ANY JURISDICTION IN WHICH
SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR
QUALIFICATION UNDER THE SECURITIES LAWS OF ANY SUCH JURISDICTION.
- --------------------------------------------------------------------------------



                                SUBJECT TO COMPLETION, DATED April 2, 1997

PROSPECTUS SUPPLEMENT
(To Prospectus dated            , 1997)

                         3,000,000 Preferred Securities*
                                  PSO Capital I
                  ___% Trust Originated Preferred SecuritiesSM,
                              Series A ("TOPrSSM")
               (liquidation preference $25 per preferred security)
                       guaranteed, as described herein, by
                       PUBLIC SERVICE COMPANY OF OKLAHOMA
                                    ---------

                        The ___% Trust Originated Preferred Securities, Series A
        (the "Series A Preferred Securities"), offered hereby represent
        undivided beneficial interests in the assets of PSO Capital I, a trust
        created under the laws of the State of Delaware ("PSO Capital I").
        Public Service Company of Oklahoma, an Oklahoma corporation ("PSO"),
        will be the owner of all of the beneficial interests represented by
        common securities of PSO Capital I ("Series A Common Securities"). The
        Bank of New York is the Property Trustee of PSO Capital I. PSO Capital I
        exists for the sole purpose of issuing the Series A Preferred Securities
        and the Series A Common Securities and investing the proceeds thereof in
        __% Junior Subordinated Deferrable

                                                       (CONTINUED ON NEXT PAGE)
                                    ---------

        SEE "RISK FACTORS" BEGINNING ON PAGE S-6 OF THIS PROSPECTUS SUPPLEMENT
        FOR CERTAIN INFORMATION RELEVANT TO AN INVESTMENT IN THE SERIES A
        PREFERRED SECURITIES INCLUDING THE PERIOD AND CIRCUMSTANCES DURING AND
        UNDER WHICH PAYMENTS OF DISTRIBUTIONS ON THE SERIES A PREFERRED
        SECURITIES MAY BE DEFERRED AND THE RELATED UNITED STATES FEDERAL INCOME
        TAX CONSEQUENCES OF SUCH DEFERRAL.


                                    ---------

          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 THE PROSPECTUS TO WHICH IT RELATES. ANY
                       REPRESENTATION TO THE CONTRARY IS A
                                CRIMINAL OFFENSE.

                                    ---------

- --------------------------------------------------------------------------------
                          INITIAL PUBLIC     UNDERWRITING       PROCEEDS TO
                          OFFERING PRICE     COMMISSION(1)  PSO CAPITAL I(2)(3)

Per Series A Preferred
  Security...........        $                   (2)              $

  Total..............        $                   (2)              $


        (1)     PSO Capital I and PSO have agreed to indemnify the several
                Underwriters against certain liabilities, including liabilities
                under the Securities Act of 1933, as amended. See
                "Underwriting."

        (2)     In view of the fact that the proceeds of the sale of the Series
                A Preferred Securities will be used to purchase the Series A
                Debentures, the Underwriting Agreement provides that PSO
                will pay to the Underwriters, as compensation ("Underwriters'
                Compensation") for their arranging the investment therein of
                such proceeds, $______ per Series A Preferred Security;
                PROVIDED, that such compensation will be $___ per Series A
                Preferred Security sold to certain institutions. Accordingly,
                the maximum aggregate amount of Underwriters' Compensation
                will be $_________, but the actual amount of Underwriters'
                Compensation will be less than such amount to the extent that
                Series A Preferred Securities are sold to such institutions.
                See "Underwriting."

        (3)     Expenses of the offering, which are payable by PSO, are
                estimated to be $250,000.
                                  ------------

     The Series A Preferred Securities offered hereby are offered severally by
the Underwriters, as specified herein, subject to receipt and acceptance by them
and subject to their right to reject any order in whole or in part. It is
expected that the Series A Preferred Securities will be ready for delivery in
book-entry form only through the facilities of The Depository Trust Company in
New York, New York, on or about __________, 1997, against payment therefor in
immediately available funds.
                                  ------------

      MERRILL LYNCH & CO.

                        GOLDMAN, SACHS & CO.


                                         MORGAN STANLEY & CO.
                                                   INCORPORATED

                                                               SMITH BARNEY INC.
                                   -----------

              The date of this Prospectus Supplement is ____, 1997.

          SM "Trust Originated Preferred Securities" and "TOPrS" are service
marks of Merrill Lynch & Co., Inc.

        *       Preliminary, subject to change.


                 CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY
         ENGAGE IN TRANSACTIONS THAT STABILIZE, MAINTAIN OR
         OTHERWISE AFFECT THE PRICE OF THE SERIES A PREFERRED
         SECURITIES, INCLUDING OVER-ALLOTMENT, STABILIZING
         BIDS, EFFECTING SYNDICATE COVERING TRANSACTIONS AND IMPOSING 
         PENALTY BIDS. FOR A DESCRIPTION OF THESE ACTIVITIES, SEE 
         "UNDERWRITING".


                                    ---------

         (CONTINUED FROM PREVIOUS PAGE)

         Interest Debentures, Series A (the "Series A Debentures") to be issued
         by PSO. The Series A Debentures will mature on ________, 2037, which
         date may be shortened to a date not earlier than ________, 2002. The
         Series A Debentures are redeemable prior to maturity at the option of
         PSO as described below. The Series A Preferred Securities will have a
         preference under certain circumstances with respect to cash
         distributions and amounts payable on liquidation, redemption or
         otherwise over the Series A Common Securities. See "Description of
         Preferred Securities--Subordination of Common Securities" in the
         accompanying Prospectus.

                  Holders of the Series A Preferred Securities will be entitled
         to receive preferential cumulative cash distributions accruing from the
         date of original issuance and payable quarterly in arrears on March 31,
         June 30, September 30 and December 31 of each year, commencing
         __________, 1997, at the annual rate of __% of the liquidation
         preference of $25 per Series A Preferred Security ("Distributions").
         PSO has the right to defer the payment of interest on the Series A
         Debentures at any time or from time to time for one or more periods
         (each, an "Extension Period"), PROVIDED that such Extension Period,
         together with all previous and further extensions thereof prior to its
         termination, does not exceed 20 consecutive quarters and does not
         extend beyond the maturity of the Series A Debentures. Upon the
         termination of any such Extension Period and the payment of all amounts
         then due on any Interest Payment Date (as defined herein), PSO may
         elect to begin a new Extension Period subject to the requirements set
         forth herein. If interest payments on the Series A Debentures are so
         deferred, Distributions on the Series A Preferred Securities will also
         be deferred and PSO will not be permitted, subject to certain
         exceptions set forth herein, to declare or pay any cash distributions
         with respect to PSO's capital stock or debt securities that rank PARI
         PASSU with or junior to the Series A Debentures. During an Extension
         Period, interest on the Series A Debentures will continue to accrue
         (and the amount of Distributions to which holders of the Series A
         Preferred Securities are entitled will accumulate at the rate of __%
         per annum, compounded quarterly) and holders of Series A Preferred
         Securities will be required to accrue interest income for United States
         federal income tax purposes in advance of receipt of cash related to
         such interest income. See "Certain Terms of the Series A
         Debentures--Option to Extend Interest Payment Period" and "Certain
         Federal Income Tax Considerations--Potential Extension of Interest
         Payment Period and Original Issue Discount."

                  PSO has, through the Series A Guarantee, the Trust Agreement,
         the Series A Debentures, the Indenture and the Expense Agreement (each
         as defined herein), taken together, fully, irrevocably and
         unconditionally guaranteed all of PSO Capital I's obligations under the
         Series A Preferred Securities. The Series A Guarantee guarantees the
         payment of Distributions and payments on liquidation or redemption of
         the Series A Preferred Securities, but only in each case to the extent
         of funds held by PSO Capital I, as described herein (the "Series A
         Guarantee"). See "Description of Guarantees" in the accompanying
         Prospectus. If PSO does not make interest payments on the Series A
         Debentures held by PSO Capital I, PSO Capital I will have insufficient
         funds to pay Distributions on the Series A Preferred Securities. The
         Series A Guarantee does not cover payment of Distributions when PSO
         Capital I does not have sufficient funds to pay such Distributions. In
         such event, a holder of Series A Preferred Securities may have the
         right to institute a legal proceeding directly against PSO to enforce
         payment to such holder of the principal of or interest on the
         Corresponding Junior Subordinated Debentures as described in
         "Description of Preferred Securities--Enforcement of Certain Rights by
         Holders of Preferred Securities" in the accompanying Prospectus. The
         obligations of PSO under the Series A Guarantee and the Series A
         Debentures are subordinate and junior in right of payment to all Senior
         Indebtedness (as defined in "Description of Junior Subordinated
         Debentures--Subordination" in the accompanying Prospectus) of PSO.

                  The Series A Preferred Securities are subject to mandatory
         redemption, in whole or in part, upon repayment of the Series A
         Debentures at maturity or their earlier redemption in an amount equal
         to the amount of related Series A Debentures maturing or being redeemed
         at a redemption price equal to the aggregate liquidation preference of
         such Series A Preferred Securities plus accumulated and unpaid
         Distributions thereon to the date of redemption. The Series A
         Debentures are redeemable prior to maturity at the option of PSO (i) on
         or after _________, 2002 in whole at any time or in part from time to
         time, at a redemption price equal to the accrued and unpaid interest on
         the Series A Debentures so redeemed to the date fixed for redemption,
         plus 100% of the principal amount thereof, or (ii) at any time, in
         whole (but not in part), within 90 days of the occurrence of a Special
         Event (as defined herein), at a redemption price equal to the accrued
         and unpaid interest on the Series A Debentures so redeemed to the date
         fixed for redemption, plus 100% of the principal amount thereof, in
         each case subject to the further conditions described under
         "Description of Junior Subordinated Debentures--Redemption" and
         "Description of Corresponding Junior Subordinated Debentures--Optional
         Redemption" in the accompanying Prospectus.

                  At any time, PSO will have the right to terminate PSO Capital
         I and, after satisfaction of liabilities to creditors of PSO Capital I
         as required by applicable law, cause the Series A Debentures to be
         distributed to the holders of the Series A Preferred Securities in
         liquidation of PSO Capital I. See "Certain Terms of the Series A
         Preferred Securities--Distribution of Series A Debentures."

                  The Series A Debentures are subordinate and junior in right of
         payment to all Senior Indebtedness of PSO. As of December 31, 1996, PSO
         had approximately $485.2 million aggregate principal amount of Senior
         Indebtedness outstanding. The terms of the Series A Debentures place no
         limitation on the amount of Senior Indebtedness that may be incurred by
         PSO. In addition, the Series A Debentures will be effectively
         subordinated to all existing and future liabilities of PSO's
         subsidiaries, if any, and holders of Series A Debentures should look
         only to the assets of PSO for payments on Series A Debentures. See
         "Description of Junior Subordinated Debentures--Subordination" in the
         accompanying Prospectus.

                  In the event of the termination of PSO Capital I, after
         satisfaction of creditors of PSO Capital I as provided by applicable
         law, the holders of the Series A Preferred Securities will be entitled
         to receive a liquidation preference of $25 per Series A Preferred
         Security plus accumulated and unpaid Distributions thereon to the date
         of payment, which may be in the form of a distribution of such Like
         Amount in Series A Debentures, subject to certain exceptions. See
         "Description of Preferred Securities--Liquidation Distribution Upon
         Termination" in the accompanying Prospectus.

                  Application will be made to list the Series A Preferred
         Securities on the New York Stock Exchange (the "NYSE") under the symbol
         "_______". Trading of the Series A Preferred Securities on the NYSE is
         expected to commence within thirty days after the initial delivery of
         the Series A Preferred Securities. If the Series A Debentures are
         distributed to the holders of Series A Preferred Securities upon the
         liquidation of PSO Capital I, PSO will use its best efforts to list the
         Series A Debentures on the NYSE or such other stock exchanges or other
         organizations, if any, on which the Series A Preferred Securities are
         then listed.

                  The Series A Preferred Securities will be represented by one
         or more global certificates registered in the name of The Depository
         Trust Company ("DTC") or its nominee. Beneficial interests in the
         Series A Preferred Securities will be shown on, and transfers thereof
         will be effected only through, records maintained by participants in
         DTC. Except as described in the accompanying Prospectus, Series A
         Preferred Securities in certificated form will not be issued in
         exchange for the global certificates. See "Description of Preferred
         Securities--Book-entry Issuance" in the accompanying Prospectus.


                  THE FOLLOWING INFORMATION SUPPLEMENTS AND SHOULD BE READ IN
         CONJUNCTION WITH THE INFORMATION CONTAINED IN THE ACCOMPANYING
         PROSPECTUS. AS USED HEREIN, (I) THE "INDENTURE" MEANS THE INDENTURE, AS
         AMENDED AND SUPPLEMENTED FROM TIME TO TIME, INCLUDING THE FIRST
         SUPPLEMENTAL INDENTURE RELATING TO THE SERIES A DEBENTURES, BETWEEN PSO
         AND THE BANK OF NEW YORK, AS TRUSTEE (THE "DEBENTURE TRUSTEE"), AND
         (II) THE "TRUST AGREEMENT" MEANS THE AMENDED AND RESTATED TRUST
         AGREEMENT AMONG PSO, AS DEPOSITOR, THE BANK OF NEW YORK, AS PROPERTY
         TRUSTEE (THE "PROPERTY TRUSTEE"), THE BANK OF NEW YORK (DELAWARE), AS
         DELAWARE TRUSTEE (THE "DELAWARE TRUSTEE"), AND THE ADMINISTRATIVE
         TRUSTEES NAMED THEREIN (COLLECTIVELY, WITH THE PROPERTY TRUSTEE AND THE
         DELAWARE TRUSTEE, THE "ISSUER TRUSTEES"). EACH OF THE OTHER CAPITALIZED
         TERMS USED IN THIS PROSPECTUS SUPPLEMENT AND NOT OTHERWISE DEFINED IN
         THIS PROSPECTUS SUPPLEMENT HAS THE MEANING SET FORTH IN THIS PROSPECTUS
         SUPPLEMENT OR IN THE ACCOMPANYING PROSPECTUS.

                                  RISK FACTORS

                  Prospective purchasers of the Series A Preferred Securities
         should carefully review the information contained elsewhere in this
         Prospectus Supplement and in the accompanying Prospectus and should
         particularly consider the following matters.

         RANKING OF SUBORDINATED OBLIGATIONS UNDER THE SERIES A GUARANTEE AND
         THE SERIES A DEBENTURES

                  The obligations of PSO under the Series A Guarantee issued by
         PSO for the benefit of the holders of Series A Preferred Securities are
         unsecured and rank subordinate and junior in right of payment to all
         Senior Indebtedness of PSO. The obligations of PSO under the Series A
         Debentures are subordinate and junior in right of payment to all such
         Senior Indebtedness. At December 31, 1996, the Senior Indebtedness of
         PSO aggregated approximately $485.2 million. In addition, the Series A
         Debentures will be effectively subordinated to all existing and future
         liabilities of PSO's subsidiaries, if any, and holders of Series A
         Debentures should look only to the assets of PSO for payments on the
         Series A Debentures. None of the Indenture, the Series A Guarantee or
         the Trust Agreement places any limitation on the amount of secured or
         unsecured debt, including Senior Indebtedness, that may be incurred by
         PSO. See "Description of Guarantees--Status of the Guarantees" and
         "Description of Junior Subordinated Debentures--Subordination" in the
         accompanying Prospectus.

                  The ability of PSO Capital I to pay amounts due on the Series
         A Preferred Securities is solely dependent upon PSO making payments on
         the Series A Debentures as and when required.

         OPTION TO EXTEND INTEREST PAYMENT PERIOD; TAX CONSEQUENCES; POTENTIAL
         MARKET VOLATILITY DURING EXTENSION PERIOD

                  PSO has the right under the Indenture to defer the payment of
         interest on the Series A Debentures at any time or from time to time
         for one or more Extension Periods, each of which, together with all
         previous and further extensions of such Extension Period prior to its
         termination, may not exceed 20 consecutive quarters and may not extend
         beyond the maturity of the Series A Debentures. As a consequence of any
         such election, quarterly Distributions on the Series A Preferred
         Securities by PSO Capital I will be deferred (and the amount of
         Distributions to which holders of the Series A Preferred Securities are
         entitled will continue to accumulate at the rate of __% per annum,
         compounded quarterly) during any such Extension Period. During any such
         Extension Period, PSO may not, and may not permit any subsidiary of PSO
         to, (i) declare, set aside or pay any dividend or distribution on, or
         repurchase, redeem, or otherwise acquire or make any sinking fund
         payment with respect to, any shares of PSO's capital stock or (ii) make
         any payment of principal, interest or premium, if any, on or repay,
         repurchase or redeem any debt securities (including other Junior
         Subordinated Debentures) that rank PARI PASSU with or junior in
         interest to the Series A Debentures or make any guarantee payments with
         respect to the foregoing (other than (a) dividends or distributions in
         shares of its capital stock or in rights to acquire shares of its
         capital stock, (b) conversions into or exchanges for shares of its
         capital stock, (c) redemptions, purchases or other acquisitions of
         shares of its capital stock made for the purpose of an employee
         incentive plan or benefit plan of PSO or any of its subsidiaries and
         mandatory redemptions or sinking fund payments with respect to any
         series of Preferred Stock of PSO that are subject to mandatory
         redemption or sinking fund requirements, PROVIDED that the aggregate
         stated value of all such series outstanding at the time of any such
         payment does not exceed five percent of the aggregate of (1) the total
         principal amount of all bonds or other securities representing secured
         indebtedness issued or assumed by PSO and then outstanding and (2) the
         capital and surplus of PSO to be stated on the books of account of PSO
         after giving effect to such payment, PROVIDED, HOWEVER, that any moneys
         deposited in any sinking fund and not in violation of this provision
         may thereafter be applied to the purchase or redemption of such
         Preferred Stock in accordance with the terms of such sinking fund
         without regard to the restrictions contained in this provision, and (d)
         payments under any guarantee by PSO with respect to any securities of a
         subsidiary of PSO, provided that the proceeds from the issuance of such
         securities were used to purchase Junior Subordinated Debentures of any
         series under the Indenture). Upon the termination of any Extension
         Period and the payment of all amounts then due on any Interest Payment
         Date, PSO may elect to begin a new Extension Period subject to the
         above requirements. Consequently, there could be multiple Extension
         Periods of varying lengths throughout the term of the Series A
         Debentures. See "Certain Terms of the Series A Preferred
         Securities--Distributions" and "Certain Terms of the Series A
         Debentures--Option to Extend Interest Payment Period."

                  Should an Extension Period occur, a holder of Series A
         Preferred Securities must accrue interest income (as original issue
         discount) on an economic accrual basis in respect of its PRO RATA share
         of the Series A Debentures held by PSO Capital I for United States
         federal income tax purposes. As a result, a holder of Series A
         Preferred Securities will include such interest in gross income for
         United States federal income tax purposes in advance of the receipt of
         cash, and will not receive the cash related to such income from PSO
         Capital I if the holder disposes of the Series A Preferred Securities
         prior to the record date for the payment of Distributions. See "Certain
         Federal Income Tax Considerations--Potential Extension of Interest
         Payment Period and Original Issue Discount" and "--Sale or Redemption
         of Series A Preferred Securities."

                  PSO has no current intention of exercising its right to defer
         payments of interest by extending the interest payment period on the
         Series A Debentures. However, should PSO elect to exercise such right
         in the future, the market price of the Series A Preferred Securities is
         likely to be affected. A holder that disposes of its Series A Preferred
         Securities during an Extension Period, therefore, might not receive the
         same return on its investment as a holder that continues to hold its
         Series A Preferred Securities.

         SPECIAL EVENT REDEMPTION

                  Upon the occurrence of a Special Event, as described in
         "Description of Preferred Securities--Redemption or Exchange--Special
         Event Redemption or Distribution of Corresponding Junior Subordinated
         Debentures" in the accompanying Prospectus, PSO has the right to redeem
         the Series A Debentures in whole (but not in part) within 90 days
         following the occurrence of such Special Event and thereby cause a
         mandatory redemption of the Series A Preferred Securities at the
         applicable redemption price. See "Description of Preferred
         Securities--Redemption or Exchange--Special Event Redemption or
         Distribution of Corresponding Junior Subordinated Debentures" in the
         accompanying Prospectus.

                  Under current United States federal income tax law, such a
         redemption of the Series A Preferred Securities would constitute a
         taxable event to the holders thereof. See "Certain Federal Income Tax
         Considerations--Sale or Redemption of Series A Preferred Securities."

         EXCHANGE OF SERIES A PREFERRED SECURITIES FOR SERIES A DEBENTURES

                  PSO will have the right at any time to terminate PSO Capital I
         and, after satisfaction of liabilities to creditors of PSO Capital I as
         required by applicable law, cause the Series A Debentures to be
         distributed to the holders of the Series A Preferred Securities in
         liquidation of PSO Capital I. See "Certain Terms of Series A Preferred
         Securities--Distribution of Series A Debentures."

                  Under current United States federal income tax law, provided
         PSO Capital I is treated as a "grantor trust" at the time of the
         distribution, a distribution of the Series A Debentures upon
         liquidation of PSO Capital I should not be a taxable event to holders
         of the Series A Preferred Securities. However, if at the time of the
         distribution, PSO Capital I were subject to United States federal
         income tax with respect to income received or accrued on the Series A
         Debentures, a distribution of the Series A Debentures by PSO Capital I
         would be a taxable event to PSO Capital I and the holders of the Series
         A Preferred Securities. See "Certain Federal Income Tax
         Considerations--Distribution of Series A Debentures to Holders of
         Series A Preferred Securities."

                  There can be no assurance as to the market prices for Series A
         Preferred Securities or Series A Debentures that may be distributed in
         exchange for Series A Preferred Securities if a liquidation of PSO
         Capital I occurs. Accordingly, the Series A Preferred Securities that
         an investor may purchase, whether pursuant to the offer made hereby or
         in the secondary market, or the Series A Debentures that a holder of
         Series A Preferred Securities may receive on liquidation of PSO Capital
         I, may trade at a discount to the price that the investor paid to
         purchase the Series A Preferred Securities offered hereby. Holders of
         Series A Preferred Securities may receive Series A Debentures upon
         liquidation of PSO Capital I and prospective purchasers of Series A
         Preferred Securities are also making an investment decision with regard
         to the Series A Debentures and should carefully review all the
         information regarding the Series A Debentures contained herein. See
         "Description of the Preferred Securities--Redemption or
         Exchange--Special Event Redemption or Distribution of Corresponding
         Junior Subordinated Debentures" and "Description of the Corresponding
         Junior Subordinated Debentures--General" in the accompanying
         Prospectus.

         SHORTENING OF STATED MATURITY OF SERIES A DEBENTURES; MARKET PRICE

                  PSO will have the right at any time and from time to time to
         shorten the maturity of the Series A Debentures to a date not earlier
         than _______, 2002 and thereby cause the Series A Preferred Securities
         to be redeemed on such earlier date. If PSO does exercise such right,
         there can be no assurance that the shortening of the maturity of the
         Series A Debentures will not have an effect on the market price of the
         Series A Preferred Securities or Series A Debentures that may be
         distributed in exchange for Series A Preferred Securities.

         POSSIBLE TAX LAW CHANGES

               On February 6, 1997, President Clinton introduced to Congress his
          budget proposal for fiscal year 1998.  Included in President Clinton's
          budget proposal is a tax provision,  which if enacted, generally would
          treat as equity, for federal income tax purposes, an instrument issued
          by a corporation  if the instrument has a maximum term of more than 15
          years and is not shown as indebtedness  on the separate  balance sheet
          of the issuer or, where the  instrument  is issued to a related  party
          (other  than a  corporation),  where the holder or some other  related
          party issues a related instrument that is not shown as indebtedness on
          the  issuer's   consolidated   balance  sheet.  The  above-  described
          provision is proposed to be effective generally for instruments issued
          on or after the date of first action by Congressional committee. As of
          the date hereof,  no such  Congressional  action has occurred.  If the
          proposed  provision  applied to the Series A Debentures,  PSO would be
          unable to deduct  interest on the Series A  Debentures.  A similar tax
          provision was  contained in President  Clinton's  budget  proposal for
          fiscal year 1997,  which  provision  was not enacted  before the 104th
          Congress  adjourned.  Under  current  law, PSO believes and intends to
          take the position  that it is able to deduct  interest on the Series A
          Debentures.   There  can  be  no  assurance  that  current  or  future
          legislative proposals or final legislation will not affect the ability
          of PSO to deduct  interest on the Series A  Debentures.  Such a change
          could  give rise to a Tax  Event,  which  would  permit PSO to cause a
          redemption of the Series A Preferred Securities before ________, 2002.
          See "Certain Terms of Series A Subordinated Debentures--Redemption" in
          this   Prospectus    Supplement   and    "Description   of   Preferred
          Securities--Redemption   or  Exchange--Special   Event  Redemption  or
          Distribution of Corresponding  Junior Subordinated  Debentures" in the
          accompanying   Prospectus.   See  also  "Certain  Federal  Income  Tax
          Considerations--Possible  Tax Law Changes."  RIGHTS UNDER THE SERIES A
          GUARANTEE

         The Series A Guarantee will be qualified as an indenture under
         the Trust Indenture Act of 1939, as amended (the "Trust Indenture
         Act"). The Bank of New York will act as the indenture trustee under the
         Series A Guarantee (the "Guarantee Trustee") for the purposes of
         compliance with the Trust Indenture Act and will hold the Series A
         Guarantee for the benefit of the holders of the Series A Preferred
         Securities. The Bank of New York also will act as Debenture Trustee for
         the Series A Debentures and as Property Trustee under the Trust
         Agreement. The Series A Guarantee guarantees to the holders of the
         Series A Preferred Securities the following payments, to the extent not
         paid by PSO Capital I: (i) any accumulated and unpaid Distributions
         required to be paid on the Series A Preferred Securities, to the extent
         that PSO Capital I has funds on hand available therefor, (ii) the
         redemption price with respect to any Series A Preferred Securities
         called for redemption to the extent that PSO Capital I has funds on
         hand available therefor at the date of redemption, and (iii) upon a
         voluntary or involuntary termination, winding up or liquidation of PSO
         Capital I (unless the Series A Debentures are distributed to holders of
         the Series A Preferred Securities), the lesser of (a) the aggregate of
         the liquidation preference and all accumulated and unpaid Distributions
         to the date of payment to the extent PSO Capital I has funds on hand
         available therefor and (b) the amount of assets of PSO Capital I
         remaining available for distribution to holders of the Series A
         Preferred Securities. If PSO were to default on its obligation to pay
         amounts payable under the Series A Debentures, PSO Capital I would lack
         funds for the payment of Distributions or amounts payable on redemption
         of the Series A Preferred Securities or otherwise, and, in such event,
         holders of the Series A Preferred Securities would not be able to rely
         upon the Series A Guarantee for payment of such amounts. Instead,
         holders of the Series A Preferred Securities would have the limited
         enforcement rights described under "Description of Preferred
         Securities--Events of Default; Notice" and "--Enforcement of Certain
         Rights by Holders of Preferred Securities" in the accompanying
         Prospectus. See "Description of Guarantees" and "Description of
         Corresponding Junior Subordinated Debentures" in the accompanying
         Prospectus. The Trust Agreement provides that each holder of Series A
         Preferred Securities by acceptance thereof agrees to the provisions of
         the Series A Guarantee and the Indenture.

         LIMITED VOTING RIGHTS

                  Holders of Series A Preferred Securities will generally have
         limited voting rights relating only to the modification of the Series A
         Preferred Securities and the dissolution, winding-up or liquidation of
         PSO Capital I. Holders of Series A Preferred Securities will not be
         entitled to vote to appoint, remove or replace the Property Trustee or
         the Delaware Trustee, which voting rights are vested exclusively in the
         holder of the Series A Common Securities except upon the occurrence of
         certain events. The Issuer Trustees and PSO may amend the Trust
         Agreement without the consent of holders of Series A Preferred
         Securities to ensure that PSO Capital I will be classified for United
         States federal income tax purposes as a "grantor trust," even if such
         action adversely affects the interests of such holders in a material
         respect. See "Description of Preferred Securities--Voting Rights;
         Amendment of Trust Agreement" and "--Removal of Issuer Trustees" in the
         accompanying Prospectus.

         TRADING CHARACTERISTICS OF SERIES A PREFERRED SECURITIES

                  PSO Capital I intends to list the Series A Preferred
         Securities on the NYSE. The Series A Preferred Securities may trade at
         prices that do not fully reflect the value of accrued but unpaid
         interest with respect to the underlying Series A Debentures. A holder
         of Series A Preferred Securities that disposes of its Series A
         Preferred Securities between record dates for payments of Distributions
         (and consequently does not receive a Distribution from PSO Capital I
         for the period prior to such disposition) will nevertheless be required
         to include as ordinary income, accrued but unpaid interest on the
         Series A Debentures through the date of disposition. Such holder will
         recognize a capital loss to the extent the amount realized with respect
         to the Series A Preferred Securities is less than its adjusted tax
         basis. Subject to certain limited exceptions, capital losses cannot be
         applied to offset ordinary income for United States federal income tax
         purposes. See "Certain Federal Income Tax Considerations--Sale or
         Redemption of Series A Preferred Securities."

                                  PSO CAPITAL I

                  PSO Capital I is a statutory business trust created under
         Delaware law pursuant to (i) a trust agreement executed by PSO, as
         Depositor, The Bank of New York, as Property Trustee, The Bank of New
         York (Delaware), as Delaware Trustee, and the Administrative Trustee
         named therein (which trust agreement was later amended and restated in
         the form of the Trust Agreement) and (ii) the filing of a certificate
         of trust with the Delaware Secretary of State on January 29, 1997. PSO
         Capital I's business and affairs are conducted by the Issuer Trustees:
         The Bank of New York, as Property Trustee, The Bank of New York
         (Delaware), as Delaware Trustee, and two individual Administrative
         Trustees who are employees or officers of or affiliated with PSO. PSO
         Capital I exists for the exclusive purposes of (i) issuing and selling
         the Series A Preferred Securities and Series A Common Securities, (ii)
         using the proceeds from the sale of Series A Preferred Securities and
         the Series A Common Securities to acquire Series A Debentures issued by
         PSO and (iii) engaging in only those other activities necessary,
         convenient or incidental thereto. Accordingly, the Series A Debentures
         will be the sole assets of PSO Capital I, and payments under the Series
         A Debentures will be the sole revenue of PSO Capital I. All of the
         Series A Common Securities will be owned by PSO. The Series A Common
         Securities will rank PARI PASSU, and payments will be made thereon PRO
         RATA, with the Series A Preferred Securities, except that upon the
         occurrence and continuance of an event of default under the Trust
         Agreement resulting from an Event of Default under the Indenture, the
         rights of PSO as holder of the Series A Common Securities to payment in
         respect of Distributions and payments upon liquidation, redemption or
         otherwise will be subordinated to the rights of the holders of the
         Series A Preferred Securities. See "Description of Preferred
         Securities--Subordination of Common Securities" in the accompanying
         Prospectus. PSO will acquire Series A Common Securities having an
         aggregate liquidation amount equal to 3% of the total capital of PSO
         Capital I. PSO Capital I has a term of 45 years, but may terminate
         earlier as provided in the Trust Agreement. The principal executive
         office of PSO Capital I is c/o Central and South West Corporation, 1616
         Woodall Rodgers Freeway, Dallas, Texas 75202, Attention: Director,
         Finance, and its telephone number is (214) 777-1000. See "The Issuer
         Trusts" in the accompanying Prospectus.

                  It is anticipated that PSO Capital I will not be subject to
         the reporting requirements of the Exchange Act.

                       PUBLIC SERVICE COMPANY OF OKLAHOMA

                  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. PSO serves approximately 473,000 retail
         customers in the eastern and southwestern Oklahoma area. Central and
         South West Corporation ("CSW"), a registered public utility holding
         company under the Public Utility Holding Company Act of 1935, as
         amended, owns all of the issued and outstanding Common Stock of PSO.
         PSO's executive offices are located at 212 East Sixth Street, Tulsa,
         Oklahoma 74119-1212, telephone number (918) 599-2000.

               The foregoing information relating to PSO does not purport to
         be comprehensive and should be read together with the financial
         statements and other information contained in the Incorporated
         Documents. See "Incorporation of Certain Documents by Reference" in the
         accompanying Prospectus.

                              RECENT DEVELOPMENTS

               On March 18,  1997,  CSW  launched a tender  offer for all of the
          outstanding  preferred  stock of PSO. The tender offer is scheduled to
          expire at 5:00 pm central  time on April 16,  1997.  PSO  concurrently
          launched  a  solicitation  of proxies  from its  common and  preferred
          shareholders for use at a special meeting scheduled for April 16, 1997
          seeking  consent to remove a provision in its Restated  Certificate of
          Incorporation  which limits the amount of  unsecured  debt that PSO is
          allowed to issue.

                                 USE OF PROCEEDS

                All of the proceeds from the sale of Series A Preferred
         Securities will be invested by PSO Capital I in Series A Debentures.
         The proceeds from the sale of such Series A Debentures will initially
         become part of the general funds of PSO and will be used to replace or
         retire, through redemption, repurchase or otherwise, one or more series
         of outstanding preferred stock of PSO, or any combination thereof, to
         repay all or a portion of PSO's short-term borrowings outstanding and
         for other general corporate purposes, subject to applicable regulatory
         requirements.

      
        CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS TO
        COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND REQUIREMENTS

                  The following table sets forth PSO's ratios of earnings to
         fixed charges and ratios of earnings to combined fixed charges and
         preferred stock dividend requirements for the years indicated:


                             YEAR ENDED DECEMBER 31,


                                      1996    1995    1994    1993    1992

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

  Earnings to Fixed Charges           2.45    4.32    4.03    2.78    2.95
  Earnings to Combined Fixed
    Charges and Preferred Stock
    Dividend Requirements
    (unaudited)                       2.37    4.18    3.69    2.68    2.85


                  For computation of the foregoing ratios: (i) earnings consist
         of net income plus fixed charges, federal and state income taxes,
         deferred income taxes and investment tax credits and (ii) fixed charges
         consist of interest on long-term debt, other interest charges, the
         interest component of leases and amortization of debt discount, premium
         and expense. Pretax earnings required for preferred stock dividends
         were computed using the effective tax rate for the applicable year.


                         SELECTED FINANCIAL INFORMATION

                          (DOLLAR AMOUNTS IN THOUSANDS)


               The selected  financial  data of PSO for the years ended December
          31,  1994,  1995 and 1996 set forth below were derived from and should
          be read in conjunction with the financial statements and related notes
          of PSO incorporated by reference in the accompanying  Prospectus.  The
          financial statements for the three-year period ended December 31, 1996
          have been audited by Arthur Andersen LLP,  independent  auditors,  and
          the  reports  of Arthur  Andersen  LLP  thereon  are  incorporated  by
          reference in the accompanying Prospectus.


                             Year Ended December 31,

                                  1996           1995            1994
                                  ----           ----            ----


Operating Revenues             $735,265        $690,823        $740,496
Operating Income                101,737         111,769          98,258
Net Income Before Cumulative
  Effect of Changes in
  Accounting Principles           --              --               --
Cumulative Effect in Changes
  in Accounting Principles        --              --               --
Net Income                      31,478          81,828           68,266
Net Utility Plant            1,302,893       1,330,376        1,304,518





                                            Capitalization at
                                            December 31, 1996
                                            ------------------
                                                (unaudited)
                                     Amount
                                   Amount Actual    %    as Adjusted(1)    %

Long-Term Debt                     $  420,301    45.5%   $  420,301      43.0%
Company Obligated Mandatorily
  Redeemable Preferred Securities
  of Subsidiary Trust Holding
  Solely Parent Junior
  Subordinated Debentures (2)            --       --         74,750       7.6
  Preferred Stock                      19,826     2.2             0        0
  Common Equity                       483,173    52.3       483,173      49.4
                                      -------    ----       -------      ----

      Total                        $  923,300    100%     $ 978,224       100%
                                     ========    ====       ========      ====

Short-Term Debt                    $  42,867      --      $     0          --
Long-Term Debt and Preferred
  Stock Currently Maturing               --       --           --          --


- - ----------------------------
(1)  Adjusted to give effect to the consummation of the offering of 3,000,000
     Preferred Securities and the application of the estimated net proceeds
     therefrom to redeem all preferred stock and short-term debt.  Amount as 
     adjusted does not take into account the current tender offer by CSW.  See
     "Recent Developments."

(2)  As described herein, the sole assets of PSO Capital I will consist solely
     of approximately $75 million of Series A Debentures, issued by PSO to PSO
     Capital I, and certain rights under the Series A Guarantee. The Series A
     Debentures will bear interest at the annual rate of ___% of the principal
     amount thereof and will mature on _______, 2037 which date may be shortened
     to a date not earlier than ________, 2002. PSO owns all of the Series A
     Common Securities of PSO Capital I.




                              ACCOUNTING TREATMENT


                  For financial reporting purposes, PSO Capital I will be
         treated as a subsidiary of PSO and, accordingly, the accounts of PSO
         Capital I will be included in the financial statements of PSO. The
         Series A Preferred Securities will be presented as a separate line item
         in the balance sheet of PSO and appropriate disclosures about the
         Series A Preferred Securities, the Series A Guarantee and the Series A
         Debentures will be included in the notes to the financial statements.
         For financial reporting purposes, PSO will record Distributions payable
         on the Series A Preferred Securities as an expense.


               CERTAIN TERMS OF THE SERIES A PREFERRED SECURITIES

         GENERAL

                  The following summary of certain terms and provisions of the
         Series A Preferred Securities supplements the description of the terms
         and provisions of the Preferred Securities set forth in the
         accompanying Prospectus under the heading "Description of Preferred
         Securities," to which description reference is hereby made. This
         summary of certain terms and provisions of the Series A Preferred
         Securities does not purport to be complete and is subject to, and
         qualified in its entirety by reference to, the Trust Agreement. The
         form of the Trust Agreement has been filed as an exhibit to the
         Registration Statement of which this Prospectus Supplement and
         accompanying Prospectus is a part.

         DISTRIBUTIONS

                  The Series A Preferred Securities represent undivided
         beneficial interests in the assets of PSO Capital I, and Distributions
         on each Series A Preferred Security will be payable at the annual rate
         of __% of the stated liquidation preference of $25, payable quarterly
         in arrears on March 31, June 30, September 30 and December 31 of each
         year. Distributions will accumulate from __________, 1997, the date of
         original issuance. The first Distribution payment date for the Series A
         Preferred Securities will be __________, 1997. The amount of
         Distributions payable for any period will be computed on the basis of a
         360-day year of twelve 30-day months and, for any period shorter than a
         full calendar month, on the basis of the actual number of days elapsed
         in such period. In the event that any date on which Distributions are
         payable on the Series A Preferred Securities is not a Business Day,
         then payment of the Distributions payable on such date will be made on
         the next succeeding day that is a Business Day (and without any
         additional Distributions or other payment in respect of any such delay)
         except that, if such Business Day is in the next succeeding calendar
         year, payment of such Distribution shall be made on the immediately
         preceding Business Day, in each such case with the same force and
         effect as if made on the date such payment was originally payable.
         Accrued and unpaid distributions will accumulate additional
         Distributions thereon ("Additional Amounts") after the payment date
         therefor in an amount equal to the additional interest accrued on
         interest in arrears on the Series A Debentures. See "Certain Terms of
         the Series A Debentures--General." The term "Distributions" as used
         herein shall include any such Additional Amounts. See "Description of
         Preferred Securities--Distributions" in the accompanying Prospectus.

                  So long as no Event of Default under the Indenture has
         occurred and is continuing, PSO has the right under the Indenture to
         defer the payment of interest on the Series A Debentures at any time or
         from time to time for one or more Extension Periods, each of which,
         together with all previous and further extensions of such Extension
         Period prior to its termination, may not exceed 20 consecutive quarters
         and may not extend beyond the maturity of the Series A Debentures. As a
         consequence of any such election, quarterly Distributions on the Series
         A Preferred Securities will be deferred by PSO Capital I during any
         such Extension Period. Distributions to which holders of the Series A
         Preferred Securities are entitled will accumulate additional
         Distributions thereon at the rate of __% per annum thereof, compounded
         quarterly from the relevant payment date for such Distributions. During
         any such Extension Period, PSO may not, and may not permit any
         subsidiary of PSO to, (i) declare, set aside or pay any dividend or
         distribution on, or repurchase, redeem, or otherwise acquire or make
         any sinking fund payment with respect to, any shares of PSO's capital
         stock or (ii) make any payment of principal, interest or premium, if
         any, on or repay, repurchase or redeem any debt securities (including
         other Junior Subordinated Debentures) that rank PARI PASSU with or
         junior in interest to the Series A Debentures or make any guarantee
         payments with respect to the foregoing (other than (a) dividends or
         distributions in shares of its capital stock or in rights to acquire
         shares of its capital stock, (b) conversions into or exchanges for
         shares of its capital stock, (c) redemptions, purchases or other
         acquisitions of shares of its capital stock made for the purpose of an
         employee incentive plan or benefit plan of PSO or any of its
         subsidiaries and mandatory redemptions or sinking fund payments with
         respect to any series of Preferred Stock of PSO that are subject to
         mandatory redemption or sinking fund requirements, PROVIDED that the
         aggregate stated value of all such series outstanding at the time of
         any such payment does not exceed five percent of the aggregate of (1)
         the total principal amount of all bonds or other securities
         representing secured indebtedness issued or assumed by PSO and then
         outstanding and (2) the capital and surplus of PSO to be stated on the
         books of account of PSO after giving effect to such payment, PROVIDED,
         HOWEVER, that any moneys deposited in any sinking fund and not in
         violation of this provision may thereafter be applied to the purchase
         or redemption of such Preferred Stock in accordance with the terms of
         such sinking fund without regard to the restrictions contained in this
         provision, and (d) payments under any guarantee by PSO with respect to
         any securities of a subsidiary of PSO, provided that the proceeds from
         the issuance of such securities were used to purchase Junior
         Subordinated Debentures of any series under the Indenture). Upon the
         termination of any such Extension Period and the payment of all amounts
         then due on any Interest Payment Date, PSO may elect to begin a new
         Extension Period, subject to the above requirements. See "Certain Terms
         of the Series A Debentures--Option to Extend Interest Payment Period"
         and "Certain Federal Income Tax Considerations--Potential Extension of
         Interest Payment Period and Original Issue Discount."

                  PSO has no current intention of exercising its right to defer
         payments of interest by extending the interest payment period on the
         Series A Debentures.

         REDEMPTION

                  Upon the repayment or redemption, in whole or in part, of the
         Series A Debentures, whether at maturity or upon earlier redemption as
         provided in the Indenture, the proceeds from such repayment or
         redemption shall be applied by the Property Trustee to redeem a Like
         Amount of the Series A Preferred Securities, upon not less than 30 nor
         more than 60 days notice prior to the date fixed for repayment or
         redemption (the "Redemption Date"), at a redemption price equal to the
         aggregate liquidation preference of such Series A Preferred Securities
         plus accumulated and unpaid Distributions thereon to the Redemption
         Date (the "Redemption Price"). See "Description of Preferred
         Securities--Redemption or Exchange" in the accompanying Prospectus and
         "Certain Terms of the Series A Debentures--Redemption."

                  PSO will have the right to redeem the Series A Debentures (i)
         on or after _______, 2002 in whole at any time or in part from time to
         time, at a redemption price equal to the accrued and unpaid interest on
         the Series A Debentures so redeemed to the date fixed for redemption,
         plus 100% of the principal amount thereof or (ii) in whole (but not in
         part), within 90 days following the occurrence of a Tax Event or an
         Investment Company Event (each as defined in the accompanying
         Prospectus, and as so collectively defined, a "Special Event"), at a
         redemption price equal to the accrued and unpaid interest on the Series
         A Debentures so redeemed to the date fixed for redemption, plus 100% of
         the principal amount thereof, in each case subject to conditions
         described under "Description of Junior Subordinated
         Debentures--Redemption or Exchange" and "Description of Corresponding
         Junior Subordinated Debentures--Optional Redemption" in the
         accompanying Prospectus.

         DISTRIBUTION OF SERIES A DEBENTURES

                  At any time, PSO will have the right to terminate PSO Capital
         I and, after satisfaction of the liabilities of creditors of PSO
         Capital I as provided by applicable law, cause the Series A Debentures
         to be distributed to the holders of the Series A Preferred Securities
         in liquidation of PSO Capital I. See "Certain Terms of the Series A
         Debentures--Distribution of Series A Debentures." If such a
         distribution should occur, PSO would continue to have the right to
         shorten the maturity of the Series A Debentures, subject to certain
         conditions as described under "Certain Terms of the Series A Debentures
         - General." Under current United States federal income tax law,
         provided PSO Capital I is treated as a "grantor trust" at the time of
         such distribution, such distribution should not be a taxable event to
         PSO Capital I or to holders of the Series A Preferred Securities. If
         there were an occurrence of a Special Event pursuant to which PSO
         Capital I was determined to be an association taxable as a corporation,
         however, such a distribution would be a taxable event to PSO Capital I
         and to such holders. See "Certain Federal Income Tax
         Considerations--Distribution of Series A Debentures to Holders of
         Series A Preferred Securities." If PSO does not elect to redeem or
         distribute the Series A Debentures as described above, the Series A
         Preferred Securities will remain outstanding until the repayment of the
         Series A Debentures.

         LIQUIDATION VALUE

                  The amount payable on the Series A Preferred Securities in the
         event of any liquidation of PSO Capital I is $25 per Series A Preferred
         Security plus accumulated and unpaid Distributions, which may be in the
         form of a distribution of a Like Amount in Series A Debentures, subject
         to certain exceptions. See "Description of Preferred
         Securities--Liquidation Distribution Upon Termination" in the
         accompanying Prospectus.

                    CERTAIN TERMS OF THE SERIES A DEBENTURES

         GENERAL

                  The following summary of certain terms and provisions of the
         Series A Debentures supplements the description of the terms and
         provisions of the Corresponding Junior Subordinated Debentures set
         forth in the accompanying Prospectus under the headings "Description of
         Junior Subordinated Debentures" and "Description of Corresponding
         Junior Subordinated Debentures," to which description reference is
         hereby made. The summary of certain terms and provisions of the Series
         A Debentures set forth below does not purport to be complete and is
         subject to, and qualified in its entirety by reference to, the
         Indenture. The Indenture has been filed as an exhibit to the
         Registration Statement of which this Prospectus Supplement and
         accompanying Prospectus is a part.

                  Concurrently with the issuance of the Series A Preferred
         Securities, PSO Capital I will invest the proceeds thereof and the
         consideration paid by PSO for the Series A Common Securities in the
         Series A Debentures issued by PSO. The Series A Debentures will bear
         interest at the annual rate of __% of the principal amount thereof,
         payable quarterly in arrears on March 31, June 30, September 30 and
         December 31 of each year (each, an "Interest Payment Date"), commencing
         _______, 1997, to the person in whose name each Series A Debenture is
         registered, subject to certain exceptions, at the close of business on
         the fifteenth day of the month immediately preceding the Interest
         Payment Date.

                  It is anticipated that, until the liquidation, if any, of PSO
         Capital I, each Series A Debenture will be held in the name of the
         Property Trustee in trust for the benefit of the holders of the Series
         A Preferred Securities. The amount of interest payable for any period
         will be computed on the basis of a 360-day year of twelve 30-day months
         and, for any period shorter than a full calendar month, on the basis of
         the actual number of days elapsed in such period. In the event that any
         date on which interest is payable on the Series A Debentures is not a
         Business Day, then payment of the interest payable on such date will be
         made on the next succeeding day that is a Business Day (and without any
         interest or other payment in respect of any such delay) except that, if
         such Business Day is in the next succeeding calendar year, payment of
         such Distribution shall be made on the immediately preceding Business
         Day, in each such case with the same force and effect as if made on the
         date such payment was originally payable. Accrued interest that is not
         paid on the applicable Interest Payment Date will bear additional
         interest on the amount thereof (to the extent permitted by law) at the
         rate per annum of __% thereof, compounded quarterly. The term
         "interest" as used herein shall include quarterly interest payments,
         interest on quarterly interest payments not paid on the applicable
         Interest Payment Date and Additional Sums (as defined below), as
         applicable.

                  The Series A Debentures will be issued as a series of Junior
         Subordinated Debentures under the Indenture. The Series A Debentures
         will mature on _____, 2037, which date may be shortened at any time and
         from time to time at the election of PSO, but in no event to a date
         earlier than _______, 2002 (such date, as it may be shortened, the
         "Maturity Date"), provided, however, that, if PSO exercises its right
         to liquidate PSO Capital I and distribute the Series A Debentures to
         holders in exchange for the Series A Preferred Securities, effective
         upon such exercise the Maturity Date of the Series A Debentures may be
         changed to any date elected by PSO that is (i) no earlier than the date
         five years after the initial issuance of the Series A Preferred
         Securities and (ii) no later than ______, 2037. The Series A Debentures
         will be unsecured and will rank junior and be subordinate in right of
         payment to all Senior Indebtedness of PSO. In addition, the Series A
         Debentures will be effectively subordinated to all existing and future
         liabilities of PSO's subsidiaries, and holders of Series A Debentures
         should look only to the assets of PSO for payments on the Series A
         Debentures. PSO currently has no subsidiaries. The Indenture does not
         limit the incurrence or issuance of other secured or unsecured debt of
         PSO, whether under the Indenture, any other existing or other indenture
         that PSO may enter into in the future or otherwise. See "Description of
         Junior Subordinated Debentures--Subordination" in the accompanying
         Prospectus.

         OPTION TO EXTEND INTEREST PAYMENT PERIOD

                  So long as no Event of Default under the Indenture has
         occurred and is continuing, PSO has the right under the Indenture at
         any time during the term of the Series A Debentures to defer the
         payment of interest at any time or from time to time for one or more
         Extension Periods, each of which, together with all previous and
         further extensions of such Extension Period prior to its termination,
         may not exceed 20 consecutive quarters and may not extend beyond the
         maturity of the Series A Debentures. At the end of such Extension
         Period, PSO must pay all interest then accrued and unpaid (together
         with interest thereon at the annual rate of __%, compounded quarterly,
         to the extent permitted by applicable law). During an Extension Period,
         interest will continue to accrue and holders of Series A Debentures (or
         holders of Series A Preferred Securities while such series is
         outstanding) will be required to accrue interest income (as original
         issue discount) on an economic accrual basis for United States federal
         income tax purposes. See "Certain Federal Income Tax
         Considerations--Potential Extension of Interest Payment Period and
         Original Issue Discount."

                  During any such Extension Period, PSO may not, and may not
         permit any subsidiary of PSO to, (i) declare, set aside or pay any
         dividend or distribution on, or repurchase, redeem, or otherwise
         acquire or make any sinking fund payment with respect to, any shares of
         PSO's capital stock or (ii) make any payment of principal, interest or
         premium, if any, on or repay, repurchase or redeem any debt securities
         (including other Junior Subordinated Debentures) that rank PARI PASSU
         with or junior in interest to the Series A Debentures or make any
         guarantee payments with respect to the foregoing (other than (a)
         dividends or distributions in shares of its capital stock or in rights
         to acquire shares of its capital stock, (b) conversions into or
         exchanges for shares of its capital stock, (c) redemptions, purchases
         or other acquisitions of shares of its capital stock made for the
         purpose of an employee incentive plan or benefit plan of PSO or any of
         its subsidiaries and mandatory redemptions or sinking fund payments
         with respect to any series of Preferred Stock of PSO that are subject
         to mandatory redemption or sinking fund requirements, PROVIDED that the
         aggregate stated value of all such series outstanding at the time of
         any such payment does not exceed five percent of the aggregate of (1)
         the total principal amount of all bonds or other securities
         representing secured indebtedness issued or assumed by PSO and then
         outstanding and (2) the capital and surplus of PSO to be stated on the
         books of account of PSO after giving effect to such payment, PROVIDED,
         HOWEVER, that any moneys deposited in any sinking fund and not in
         violation of this provision may thereafter be applied to the purchase
         or redemption of such Preferred Stock in accordance with the terms of
         such sinking fund without regard to the restrictions contained in this
         provision, and (d) payments under any guarantee by PSO with respect to
         any securities of a subsidiary of PSO, provided that the proceeds from
         the issuance of such securities were used to purchase Junior
         Subordinated Debentures of any series under the Indenture). Upon the
         termination of any such Extension Period and the payment of all amounts
         then due on any Interest Payment Date, PSO may elect to begin a new
         Extension Period, subject to the above requirements. No interest shall
         be due and payable during an Extension Period, except at the end
         thereof. PSO must give the Administrative Trustees and the Debenture
         Trustee notice of its election of such Extension Period at least one
         Business Day prior to the earlier of (i) the date the Distributions on
         the Series A Preferred Securities would have been payable except for
         the election to begin such Extension Period and (ii) the date the
         Administrative Trustees are required to give notice to the NYSE or
         other applicable self-regulatory organization or to holders of such
         Series A Preferred Securities of the record date or the date such
         Distributions are payable, but in any event not less than one Business
         Day prior to such record date. The Administrative Trustees shall give
         notice of PSO's election to begin a new Extension Period to the holders
         of the Series A Preferred Securities within five Business Days of the
         receipt of notice thereof. See "Description of Junior Subordinated
         Debentures--Option to Extend Interest Payment Date" in the accompanying
         Prospectus.

         ADDITIONAL SUMS

                  If PSO Capital I is required to pay any additional taxes,
         duties or other governmental charges as a result of a Tax Event, PSO
         will pay as additional amounts on the Series A Debentures such amounts
         ("Additional Sums") as shall be required so that the Distributions
         payable by PSO Capital I shall not be reduced as a result of any such
         additional taxes, duties or other governmental charges, subject to the
         conditions described under "Description of Preferred
         Securities--Redemption or Exchange--Special Event Redemption or
         Distribution of Corresponding Junior Subordinated Debentures" in the
         accompanying Prospectus.

         REDEMPTION

                  The Series A Debentures are redeemable prior to maturity at
         the option of PSO (i) on or after _______, 2002, in whole at any time
         or in part from time to time, at a redemption price equal to the
         accrued and unpaid interest on the Series A Debentures so redeemed to
         the date fixed for redemption plus 100% of the principal amount thereof
         or (ii) in whole (but not in part), within 90 days of the occurrence of
         a Special Event, at a redemption price equal to the accrued and unpaid
         interest on the Series A Debentures so redeemed to the date fixed for
         redemption, plus 100% of the principal amount thereof, in each case
         subject to the further conditions described under "Description of
         Junior Subordinated Debentures--Redemption" and "Description of
         Corresponding Junior Subordinated Debentures--Optional Redemption" in
         the accompanying Prospectus.

         DISTRIBUTION OF SERIES A DEBENTURES

                  Under certain circumstances involving the termination of PSO
         Capital I, Series A Debentures may be distributed to the holders of the
         Series A Preferred Securities in liquidation of PSO Capital I after
         satisfaction of liabilities to creditors of PSO Capital I as provided
         by applicable law. If distributed to holders of Series A Preferred
         Securities in liquidation, the Series A Debentures will initially be
         issued in the form of one or more global securities and DTC, or any
         successor depositary for the Series A Preferred Securities, will act as
         depositary for the Series A Debentures. It is anticipated that the
         depositary arrangements for the Series A Debentures would be
         substantially identical to those in effect for the Series A Preferred
         Securities. If the Series A Debentures are distributed to the holders
         of Series A Preferred Securities upon the liquidation of PSO Capital I,
         PSO will use its best efforts to list the Series A Debentures on the
         NYSE or such other stock exchanges or other organizations, if any, on
         which the Series A Preferred Securities are then listed. There can be
         no assurance as to the market price of any Series A Debentures that may
         be distributed to the holders of Series A Preferred Securities. For a
         description of DTC and the terms of the depositary arrangements
         relating to payments, transfers, voting rights, redemption and other
         notices and other matters, see "Description of Preferred
         Securities--Book-entry Issuance" in the accompanying Prospectus.

         REGISTRATION OF SERIES A DEBENTURES

                  A global security shall be exchangeable for Series A
         Debentures registered in the names of persons other than DTC or its
         nominee only if (i) DTC notifies PSO that it is unwilling or unable to
         continue as a depositary for such global security and no successor
         depositary shall have been appointed, or if at any time DTC ceases to
         be a clearing agency registered under the Exchange Act, at a time when
         DTC is required to be so registered to act as such depositary, (ii) PSO
         in its sole discretion determines that such global security shall be so
         exchangeable or (iii) the global security was issued pursuant to a
         liquidation of PSO Capital I as provided in the Trust Agreement and
         there shall have occurred and be continuing a Debenture Event of
         Default with respect to such global security and the holders of at
         least a majority of the beneficial interests in such global security
         advise the Property Trustee in writing that the continuation of a
         book-entry system through DTC is no longer in their best interest. Any
         global security that is exchangeable pursuant to the preceding sentence
         shall be exchangeable for definitive certificates registered in such
         names as DTC shall direct. It is expected that such instructions will
         be based upon directions received by DTC from its Participants with
         respect to ownership of beneficial interests in such global security.
         In the event that Series A Debentures are issued in definitive form,
         such Series A Debentures will be in denominations of $25 and integral
         multiples thereof and may be transferred or exchanged at the offices
         described below.

                  Payments on Series A Debentures represented by a global
         security will be made to DTC, as the depositary for the Series A
         Debentures. In the event Series A Debentures are issued in definitive
         form, principal and interest will be payable, the transfer of the
         Series A Debentures will be registrable, and Series A Debentures will
         be exchangeable for Series A Debentures of other denominations of a
         like aggregate principal amount, at the corporate office of the
         Debenture Trustee in New York, New York, or at the offices of any
         paying agent or transfer agent appointed by PSO, PROVIDED that payment
         of interest may be made at the option of PSO by check mailed to the
         address of the persons entitled thereto or by wire transfer as provided
         under "Description of Junior Subordinated Debentures--Payment and
         Paying Agents" in the accompanying Prospectus. In addition, if the
         Series A Debentures are issued in certificated form, the record dates
         for payment of interest will be the 15th day of the month in which the
         relevant Interest Payment Date occurs. For a description of DTC and the
         terms of the depositary arrangements relating to payments, transfers,
         voting rights, redemptions and other notices and other matters, see
         "Description of Preferred Securities--Book-entry Issuance" in the
         accompanying Prospectus.

                              ERISA CONSIDERATIONS

                  Each fiduciary of a pension, profit-sharing or other employee
         benefit plan subject to the Employee Retirement Income Security Act of
         1974, as amended ("ERISA")(a "Plan"), should consider the fiduciary
         standards of ERISA in the context of the Plan's particular
         circumstances before authorizing an investment in the Series A
         Preferred Securities. Accordingly, among other factors, the fiduciary
         should consider whether the investment would satisfy the prudence and
         diversification requirements of ERISA and would be consistent with the
         documents and instruments governing the Plan.

                  Section 406 of ERISA and Section 4975 of the Internal Revenue
         Code of 1986, as amended (the "Code") prohibit Plans, as well as
         individual retirement accounts and Keogh plans subject to Section 4975
         of the Code (also "Plans"), from engaging in certain transactions
         involving "plan assets" with persons who are "parties in interest"
         under ERISA or "disqualified persons" under the Code ("Parties in
         Interest") with respect to such Plan. A violation of these "prohibited
         transaction" rules may result in an excise tax or other liabilities
         under ERISA and/or Section 4975 of the Code for such persons, unless
         exemptive relief is available under an applicable statutory or
         administrative exemption. Employee benefit plans that are governmental
         plans (as defined in Section 3(32) of ERISA), certain church plans (as
         defined in Section 3(33) of ERISA) and foreign plans (as described in
         Section 4(b)(5) of ERISA) are not subject to the requirements of ERISA
         or Section 4975 of the Code.

                  Under a regulation (the "Plan Assets Regulation") issued by
         the U.S. Department of Labor (the "DOL"), the assets of PSO Capital I
         would be deemed to be "plan assets" of a Plan for purposes of ERISA and
         Section 4975 of the Code if "plan assets" of the Plan were used to
         acquire an equity interest in PSO Capital I and no exception were
         applicable under the Plan Assets Regulation. An "equity interest" is
         defined under the Plan Assets Regulation as any interest in an entity
         other than an instrument which is treated as indebtedness under
         applicable local law and which has no substantial equity features and
         specifically includes a beneficial interest in a trust.

                  Pursuant to an exception contained in the Plan Assets
         Regulation, the assets of PSO Capital I would not be deemed to be "plan
         assets" of investing Plans if, immediately after the most recent
         acquisition of any equity interest in PSO Capital I, less that 25% of
         the value of each class of equity interests in PSO Capital I were held
         by Plans, other employee benefit plans not subject to ERISA or Section
         4975 of the Code (such as governmental, church and foreign plans), and
         entities holding assets deemed to be "plan assets" of any Plan
         (collectively, "Benefit Plan Investors"), or if the Series A Preferred
         Securities were "publicly-offered securities" for purposes of the Plan
         Assets Regulation. No assurance can be given that the value of the
         Series A Preferred Securities held by Benefit Plan Investors will be
         less than 25% of the total value of such Series A Preferred Securities
         at the completion of the initial offering or thereafter, and no
         monitoring or other measures will be taken with respect to the
         satisfaction of the conditions to this exception. In addition, no
         assurance can be given that the Series A Preferred Securities would be
         considered to be "publicly-offered securities" under the Plan Assets
         Regulation. All of the Series A Common Securities will be purchased and
         initially held by PSO.

                  Certain transactions involving PSO Capital I could be deemed
         to constitute direct or indirect prohibited transactions under ERISA
         and Section 4975 of the Code with respect to a Plan if the Series A
         Preferred Securities were acquired with "plan assets" of such Plan and
         the assets of PSO Capital I were deemed to be "plan assets" of Plans
         investing in PSO Capital I. For example, if PSO is a Party in Interest
         with respect to an investing Plan, extensions of credit between PSO
         Capital I and PSO (as represented by the Series A Debentures and the
         Guarantee) would likely be prohibited by Section 406(a)(1)(B) of ERISA
         and Section 4975(c)(1)(B) of the Code, UNLESS exemptive relief were
         available under an applicable administrative exemption (see below). In
         addition, if PSO were considered to be a fiduciary with respect to PSO
         Capital I as a result of certain powers it holds (such as the powers to
         remove and replace the Property Trustee and the Administrative
         Trustees), certain operations of PSO Capital I, including the optional
         redemption or acceleration of the Series A Debentures, could be
         considered to be prohibited transactions under Section 406(b) of ERISA
         and Section 4975(c)(1)(E) of the Code. IN ORDER TO AVOID SUCH POTENTIAL
         PROHIBITED TRANSACTIONS, EACH INVESTING PLAN, BY PURCHASING THE SERIES
         A PREFERRED SECURITIES, WILL BE DEEMED TO HAVE DIRECTED PSO CAPITAL I
         TO INVEST IN THE SERIES A DEBENTURES AND TO HAVE APPOINTED THE PROPERTY
         TRUSTEE.

                  The DOL has issued five prohibited transaction class
         exemptions ("PTCEs") that may provide exemptive relief if required for
         direct or indirect prohibited transactions that may arise from the
         purchase or holding of the Series A Preferred Securities if assets of
         PSO Capital I were deemed to be "plan assets" of Plans investing in PSO
         Capital I as described above. Those class exemptions are PTCE 96-23
         (for certain transactions determined by in-house asset managers), PTCE
         95-60 (for certain transactions involving insurance company general
         accounts), PTCE 91-38 (for certain transactions involving bank
         collective investment funds), PTCE 90-1 (for certain transactions
         involving insurance company pooled separate accounts), and PTCE 84-14
         (for certain transactions determined by independent qualified asset
         managers).

                  Because the Series A Preferred Securities may be deemed to be
         equity interests in PSO Capital I for purposes of applying ERISA and
         Section 4975 of the Code, the Series A Preferred Securities may not be
         purchased or held by any Plan, any entity whose underlying assets
         include "plan assets" by reason of any Plan's investment in the entity
         or any person investing "plan assets" of any Plan (each, a "Plan Asset
         Entity"), UNLESS such purchaser or holder is eligible for the exemptive
         relief available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14 or
         another applicable exemption. Any purchaser or holder of the Series A
         Preferred Securities or any interest therein will be deemed to have
         represented by its purchase and holding thereof that it either (a) is
         not a Plan or a Plan Asset Entity or (b) is eligible for the exemptive
         relief available under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14 or
         another applicable exemption with respect to such purchase or holding.
         If a purchaser or holder of the Series A Preferred Securities that is a
         Plan or a Plan Asset Entity elects to rely on an exemption other than
         PTCE 96-23, 95-60, 91-38, 90-1 or 84-14, PSO and PSO Capital I may
         require a satisfactory opinion of counsel or other evidence with
         respect to the availability of such exemption for such purchase and
         holding.

                  Due to the complexity of these rules and the penalties that
         may be imposed upon persons involved in nonexempt prohibited
         transactions, it is particularly important that fiduciaries or other
         persons considering purchasing the Series A Preferred Securities on
         behalf of or with "plan assets" of any Plan consult with their counsel
         regarding the potential consequences if the assets of PSO Capital I
         were deemed to be "plan assets" and the availability of exemptive
         relief under PTCE 96-23, 95-60, 91-38, 90-1 or 84-14 or any other
         applicable exemption.

                  Government plans, as defined in Section 3(32) of ERISA, are
         not subject to ERISA, and are also not subject to the prohibited
         transaction provisions under Section 4975 of the Code. However, state
         laws or regulations governing the investment and management of the
         assets of such plans may contain fiduciary and prohibited transaction
         requirements similar to those under ERISA and the Code discussed above.
         Accordingly, fiduciaries of governmental plans, in consultation with
         their advisors, should consider the impact of their respective state
         pension codes on investments in the Series A Preferred Securities, and
         the considerations discussed above, to the extent applicable.


                    CERTAIN FEDERAL INCOME TAX CONSIDERATIONS

                  The following is a general summary of certain United States
         federal income tax consequences of the purchase, ownership and
         disposition of Series A Preferred Securities. This summary only
         addresses the tax consequences to a person acquiring Series A Preferred
         Securities on their original issue at their original offering price and
         that is a "United States Person" within the meaning of the Code, which
         includes (i) an individual citizen or resident of the United States,
         (ii) a corporation or partnership organized in or under the laws of the
         United States or any state thereof or the District of Columbia or (iii)
         an estate or trust specified as being a United States Person in the
         Code. This summary does not address all tax consequences that may be
         applicable to a United States Person that is a beneficial owner of the
         Series A Preferred Securities, nor does it address the tax consequences
         to (i) persons that are not United States Persons, (ii) persons subject
         to special treatment under United States federal income tax law, such
         as banks, insurance companies, thrift institutions, regulated
         investment companies, real estate investment trusts, tax-exempt
         organizations and dealers in securities or currencies, (iii) persons
         that will hold Preferred Securities as part of a position in a
         "straddle" or as part of a "hedging," "conversion" or other integrated
         investment transaction for United States federal income tax purposes,
         (iv) persons whose "functional currency" is not the United States
         dollar or (v) persons that do not hold the Series A Preferred
         Securities as capital assets.

                  The statements of law or legal conclusion set forth in this
         summary constitute the opinion of Christy & Viener, special tax counsel
         to PSO and PSO Capital I. This summary is based upon the Code, Treasury
         Regulations, Internal Revenue Service rulings and pronouncements and
         judicial decisions now in effect, all of which are subject to change at
         any time. Such changes may be applied retroactively in a manner that
         could cause the tax consequences to vary substantially from the
         consequences described below, possibly adversely affecting a beneficial
         owner of a Series A Preferred Security. In particular, legislation has
         been proposed that could adversely affect PSO's ability to deduct
         interest on the Series A Debentures, which would in turn permit PSO to
         cause a redemption of the Series A Preferred Securities. See
         "--Possible Tax Law Changes." The authorities on which this summary is
         based are subject to various interpretations and it is therefore
         possible that the United States federal income tax treatment of the
         Series A Preferred Securities may differ from the treatment described
         below.

                  PROSPECTIVE INVESTORS ARE ADVISED TO CONSULT WITH THEIR OWN
         TAX ADVISORS IN LIGHT OF THEIR OWN PARTICULAR CIRCUMSTANCES AS TO THE
         UNITED STATES FEDERAL TAX CONSEQUENCES OF PURCHASE, OWNERSHIP AND
         DISPOSITION OF SERIES A PREFERRED SECURITIES, AS WELL AS THE EFFECT OF
         ANY STATE, LOCAL OR FOREIGN TAX LAWS.

         CLASSIFICATION OF PSO CAPITAL I

                  In connection with the issuance of the Series A Preferred
         Securities, Christy & Viener will render its opinion to the effect
         that, under then current law and assuming compliance with the terms of
         the Trust Agreement and certain other documents, and based on certain
         facts and assumptions contained in such opinion, PSO Capital I will be
         classified as a "grantor trust" and not as an association taxable as a
         corporation for United States federal income tax purposes. As a result,
         each beneficial owner of a Series A Preferred Security (a
         "Securityholder") will be treated as owning an undivided beneficial
         interest in the Series A Debentures.

         CLASSIFICATION OF THE SERIES A DEBENTURES

                  Based on the advice of its counsel, PSO believes and intends
         to take the position that the Series A Debentures will constitute
         indebtedness for United States federal income tax purposes. No
         assurance can be given that such position will not be challenged by the
         Internal Revenue Service or, if challenged, that such challenge will
         not be successful. By purchasing and accepting Series A Preferred
         Securities, each Securityholder agrees to treat the Series A Debentures
         as indebtedness and the Series A Preferred Securities as evidence of an
         indirect beneficial ownership in the Series A Debentures. The remainder
         of this discussion assumes that the Series A Debentures will be
         classified as indebtedness of PSO for United States federal income tax
         purposes.

         INCOME FROM SERIES A PREFERRED SECURITIES

                  Each Securityholder will be required to include in gross
         income its pro rata share of the interest income paid or accrued with
         respect to the Series A Debentures. Such income inclusion will be in
         accordance with the Securityholder's regular method of accounting
         except as set forth below under "--Potential Extension of Interest
         Payment Period and Original Issue Discount." Because income on the
         Series A Preferred Securities will constitute interest (or original
         issue discount), no amount included in income with respect to the
         Series A Preferred Securities will be eligible for the
         dividends-received deduction.

         POTENTIAL EXTENSION OF INTEREST PAYMENT PERIOD AND ORIGINAL ISSUE
         DISCOUNT

                  Under recently issued Treasury regulations (the
         "Regulations"), a contingency that stated interest will not be timely
         paid that is "remote" because of the terms of the relevant debt
         instrument will be ignored in determining whether such debt instrument
         is issued with original issue discount ("OID"). As a result of terms
         and conditions of the Series A Debentures that prohibit certain
         payments with respect to PSO's capital stock and indebtedness if PSO
         elects to extend interest payment periods (see "Certain Terms of the
         Series A Debentures--Option to Extend Interest Payment Period"), PSO
         believes that the likelihood of its exercising its option to defer
         payments is remote. Based on the foregoing, PSO believes that the
         Series A Debentures will not be considered to be issued with OID at the
         time of their original issuance and, accordingly, a Securityholder
         should include in gross income such holder's allocable share of
         interest on the Series A Debentures in accordance with such holder's
         regular method of tax accounting.

                  Under the Regulations, if PSO exercises its option to defer
         any payment of interest, the Series A Debentures would at that time be
         treated as issued with OID, and all stated interest on the Series A
         Debentures would thereafter be treated as OID for so long as the Series
         A Debentures remained outstanding. In such event, all of a
         Securityholder's taxable interest income with respect to the Series A
         Debentures would be accounted for as OID on an economic-accrual basis
         regardless of such holder's method of tax accounting, and actual
         distributions of stated interest would not be reported as taxable
         income. Consequently, a Securityholder would be required to include OID
         in gross income even though PSO would not make any actual cash payments
         during an Extension Period.

                  The Regulations have not been addressed in any rulings or
         other interpretations by the Internal Revenue Service (the "IRS"), and
         it is possible that the IRS could take a position contrary to the
         interpretation herein.

         DISTRIBUTION OF SERIES A DEBENTURES TO HOLDERS OF SERIES A PREFERRED
         SECURITIES

                  As described under the caption "Certain Terms of the Series A
         Preferred Securities--Distribution of Series A Debentures," PSO will
         have the right, at any time, to liquidate PSO Capital I and cause the
         Series A Debentures to be distributed to the holders of the Series A
         Preferred Securities. Under current United States federal income tax
         law, provided PSO Capital I is treated as a "grantor trust" at the time
         of such distribution, such distribution would not be a taxable event to
         Securityholders. Such a distribution would result in a Securityholder
         receiving directly such Securityholder's pro rata share of the Series A
         Debentures previously held indirectly through PSO Capital I, with a
         holding period and aggregate tax basis equal to the holding period and
         aggregate tax basis such Securityholder had in such Securityholder's
         Series A Preferred Securities before such distribution.

                  If, however, PSO Capital I were subject to United States
         federal income tax as a corporation with respect to income accrued or
         received on the Series A Debentures at the time of liquidation, the
         distribution of Series A Debentures to Securityholders by PSO Capital I
         would be a taxable event to PSO Capital I and each Securityholder, and
         each Securityholder would recognize gain or loss as if the
         Securityholder had exchanged its Series A Preferred Securities for the
         Series A Debentures it received upon the liquidation of PSO Capital I.

                  A Securityholder would accrue interest in respect of Series A
         Debentures received from PSO Capital I in the manner described above
         under "--Income from Series A Preferred Securities" and "--Potential
         Extension of Interest Payment Period and Original Issue Discount."

         SALE OR REDEMPTION OF SERIES A PREFERRED SECURITIES

                  A Securityholder that sells (including a redemption for cash)
         Series A Preferred Securities will recognize gain or loss equal to the
         difference between its adjusted tax basis in the Series A Preferred
         Securities and the amount of consideration paid for such Series A
         Preferred Securities (excluding the portion that represents accrued and
         unpaid interest that has not yet been included in income, which portion
         will constitute ordinary income). Assuming that PSO does not exercise
         its option to defer payment of interest on the Series A Debentures and
         the Series A Debentures are not considered issued with OID, a
         Securityholder's adjusted tax basis in the Series A Preferred
         Securities generally will be its initial purchase price. If PSO does
         exercise its option to defer payment of interest or the Series A
         Debentures are otherwise deemed to have been issued with OID, a
         Securityholder's adjusted tax basis in the Series A Preferred
         Securities generally will be its initial purchase price, increased by
         OID previously includible in such Securityholder's gross income to the
         date of disposition and decreased by Distributions or other payments
         received on the Series A Preferred Securities in respect of OID. Gain
         or loss on the sale of the Series A Preferred Securities generally will
         be a capital gain or loss and generally will be a long-term capital
         gain or loss if the Series A Preferred Securities have been held for
         more than one year.

                  The Series A Preferred Securities may trade at a price that
         does not fully reflect the value of accrued but unpaid interest with
         respect to the underlying Series A Debentures. A Securityholder that
         disposes of such Securityholder's Series A Preferred Securities between
         record dates for payments of Distributions (and consequently does not
         receive a Distribution from PSO Capital I for the period prior to such
         disposition) will nevertheless be required to include as ordinary
         income accrued but unpaid interest on the Series A Debentures through
         the date of disposition. Such Securityholder will recognize a capital
         loss on the disposition of Series A Preferred Securities to the extent
         the amount realized with respect to the Series A Preferred Securities
         is less than the Securityholder's adjusted tax basis in the Series A
         Preferred Securities. Subject to certain limited exceptions, capital
         losses cannot be applied to offset ordinary income for United States
         federal income tax purposes.

         BACKUP WITHHOLDING TAX AND INFORMATION REPORTING

                  The amount of interest income paid and OID accrued on the
         Series A Preferred Securities will be reported to Securityholders and
         to the Internal Revenue Service except in the case of corporations and
         other exempt Securityholders. "Backup" withholding at a rate of 31%
         will apply to payments of interest to non-exempt Securityholders unless
         the Securityholder furnishes its taxpayer identification number in the
         manner prescribed in applicable Treasury Regulations, certifies that
         such number is correct and meets certain other conditions.

                  Payment of proceeds from disposition of Series A Preferred
         Securities to or through the United States office of a broker is
         subject to information reporting and backup withholding unless the
         Securityholder establishes an exemption from information reporting and
         backup withholding.

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

         POSSIBLE TAX LAW CHANGES

               On February 6, 1997, President Clinton introduced to Congress his
          budget proposal for fiscal year 1998.  Included in President Clinton's
          budget proposal is a tax provision,  which if enacted, generally would
          treat as equity, for federal income tax purposes, an instrument issued
          by a corporation  if the instrument has a maximum term of more than 15
          years and is not shown as indebtedness  on the separate  balance sheet
          of the issuer or, where the  instrument  is issued to a related  party
          (other  than a  corporation),  where the holder or some other  related
          party issues a related instrument that is not shown as indebtedness on
          the  issuer's   consolidated   balance  sheet.  The  above-  described
          provision is proposed to be effective generally for instruments issued
          on or after the date of first action by Congressional committee. As of
          the date hereof,  no such  Congressional  action has occurred.  If the
          proposed  provision  applied to the Series A Debentures,  PSO would be
          unable to deduct  interest on the Series A  Debentures.  A similar tax
          provision was  contained in President  Clinton's  budget  proposal for
          fiscal year 1997,  which  provision  was not enacted  before the 104th
          Congress  adjourned.  Under  current  law, PSO believes and intends to
          take the position  that it is able to deduct  interest on the Series A
          Debentures.   There  can  be  no  assurance  that  current  or  future
          legislative proposals or final legislation will not affect the ability
          of PSO to deduct  interest on the Series A  Debentures.  Such a change
          could  give  rise to a Tax  Event, which would  permit  PSO to cause a
          redemption  of the Series A Preferred  Securities  as  described  more
          fully  under  "Description  of  Preferred   Securities--Redemption  or
          Exchange--Special  Event  Redemption or Distribution of  Corresponding
          Junior Subordinated Debentures" in the accompanying Prospectus.

                                  UNDERWRITING

                  Subject to the terms and conditions of the Underwriting
         Agreement, PSO and PSO Capital I have agreed that PSO Capital I will
         sell to each of the Underwriters named below, and each of such
         Underwriters, for whom Merrill Lynch, Pierce, Fenner & Smith
         Incorporated, Goldman, Sachs & Co., Morgan Stanley & Co. Incorporated
         and Smith Barney Inc. are acting as representatives (the
         "Representatives"), has severally agreed to purchase from PSO Capital I
         the respective number of Series A Preferred Securities set forth
         opposite its name below:

                                                                 Number of
                                                                 Series A
                                                                 Preferred
                                               UNDERWRITER      SECURITIES

      Merrill Lynch, Pierce, Fenner & Smith                      _________
                      Incorporated.........................
      Goldman, Sachs & Co..................................
      Morgan Stanley & Co. Incorporated....................
      Smith Barney Inc....................................       _________

               Total.......................................      3,000,000

                  Subject to the terms and conditions set forth in the
         Underwriting Agreement, the Underwriters are committed to take and pay
         for all such Series A Preferred Securities offered hereby, if any are
         taken.

                  The Underwriters propose to offer the Series A Preferred
         Securities in part directly to the public at the initial public
         offering price set forth on the cover page of this Prospectus
         Supplement and in part to certain securities dealers at such price less
         a concession of $____ per Series A Preferred Security. The Underwriters
         may allow, and such dealers may reallow, a concession not in excess of
         $____ per Series A Preferred Security to certain brokers and dealers.
         After the Series A Preferred Securities are released for sale to the
         public, the offering price and other selling terms may from time to
         time be varied by the Representatives.

                  In view of the fact that the proceeds from the sale of the
         Series A Preferred Securities will be used to purchase the Series A
         Debentures issued by PSO, the Underwriting Agreement provides that PSO
         will pay as Underwriters' Compensation for the Underwriters arranging
         the investment therein of such proceeds an amount of $____ per Series A
         Preferred Security ($____ per Series A Preferred Security sold to
         certain institutions) for the accounts of the several Underwriters.

               In  connection   with  this  offering  and  in  compliance   with
          applicable law, the Underwriters may overallot (i.e., sell more Series
          A  Preferred  Securities  than the total  amount  shown on the list of
          Underwriters  and  participations  which appears above) and may effect
          transactions which stabilize,  maintain or otherwise affect the market
          price of the Series A Preferred Securities at levels above those which
          might  otherwise  prevail in the open market.  Such  transactions  may
          include  placing  bids  for  the  Series  A  Preferred  Securities  or
          effecting  purchases  of the  Series A  Preferred  Securities  for the
          purpose of pegging,  fixing or  maintaining  the price of the Series A
          Preferred  Securities or for the purpose of reducing a syndicate short
          position  created in connection  with the offering.  In addition,  the
          contractural  arrangements among the Underwriters  include a provision
          whereby, if the Representatives purchase Series A Preferred Securities
          in the open market for the account of the  underwriting  syndicate and
          the secrities  purchased can be traced to a particular  Underwriter or
          member of the selling group,  the  underwriting  syndicate may require
          the  Underwriter  or selling  group member in question to purchase the
          Series A  Preferred  Securities  in  question at the cost price to the
          syndicate or may recover from (or decline to pay to ) the  Underwriter
          or selling group member in question the selling concession  applicable
          to the securities in question.  The  Underwriters  are not required to
          engage  in any  of  these  activities  and  any  such  activities,  if
          commenced, may be discontinued at any time.



                  PSO and PSO Capital I have agreed that, during the period
         beginning from the date of the Underwriting Agreement and continuing to
         and including the earlier of (i) the termination of trading
         restrictions on the Series A Preferred Securities, as determined by the
         Underwriters, and (ii) 30 days after the closing date, they will not
         offer, sell, contract to sell or otherwise dispose of any Preferred
         Securities, any other beneficial interests in the assets of PSO Capital
         I, or any preferred securities or any other securities of PSO Capital I
         or PSO which are substantially similar to the Series A Preferred
         Securities, including any guarantee of such securities, or any
         securities convertible into or exchangeable for or that represent the
         right to receive securities, preferred securities or any such
         substantially similar securities of either PSO Capital I or PSO,
         without the prior written consent of the Representatives, except for
         the Series A Preferred Securities and the Series A Guarantee offered in
         connection with the offering.

                  Prior to this offering, there has been no public market for
         the Series A Preferred Securities. The Series A Preferred Securities
         will be listed on the NYSE under the symbol "______". Trading of the
         Series A Preferred Securities on the NYSE is expected to commence
         within thirty days after the initial delivery of the Series A Preferred
         Securities. In order to meet one of the requirements for listing the
         Series A Preferred Securities on the NYSE, the Underwriters will
         undertake to sell lots of 100 or more Series A Preferred Securities to
         a minimum of 400 beneficial holders. Trading of the Series A Preferred
         Securities on the NYSE is expected to commence within a seven-day
         period after the initial delivery of the Series A Preferred Securities.
         The Representatives have advised PSO that they intend to make a market
         in the Series A Preferred Securities prior to commencement of trading
         on the NYSE, but are not obligated to do so and may discontinue market
         making at any time without notice. No assurance can be given as to the
         liquidity of the trading market for the Series A Preferred Securities.

                  PSO and PSO Capital I have agreed to indemnify the several
         Underwriters against certain liabilities, including liabilities under
         the Securities Act of 1933, as amended, or to contribute to payments
         the Underwriters may be required to make in respect thereof.

                  Certain of the Underwriters or their affiliates have provided
         from time to time, and expect to provide in the future, investment or
         commercial banking services to PSO and its affiliates, for which such
         Underwriters or their affiliates have received or will receive
         customary fees and commissions.

                                 LEGAL OPINIONS

                  Certain matters of Delaware law relating to the validity of
         the Series A Preferred Securities, the enforceability of the Trust
         Agreement and the creation of PSO Capital I will be passed upon by
         Richards, Layton & Finger, special Delaware counsel to PSO and PSO
         Capital I. The validity of the Series A Guarantee and the Series A
         Debentures will be passed upon for PSO by Milbank, Tweed, Hadley &
         McCloy, New York, New York, and for the Underwriters by Sidley &
         Austin, Chicago, Illinois. Sidley & Austin has from time to time
         represented CSW and certain of its affiliates, including PSO, in
         connection with certain matters. All matters of Oklahoma law will be
         passed upon by Doerner, Saunders, Daniel & Anderson, Tulsa, Oklahoma.
         Certain matters relating to United States federal income tax
         considerations will be passed upon by Christy & Viener, New York, New
         York, special tax counsel to PSO and PSO Capital I.



                    (THIS PAGE INTENTIONALLY LEFT BLANK)

===============================================================================
Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission.  These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective.  This prospectus shall not constitute an offer to sell
or the solicitation of an offer to buy nor shall there be any sale of these
securities in any jurisdiction in which such offer, solicitation or sale would
be unlawful prior to registration or qualification under the securities laws of
any such jurisdiction.
===============================================================================


                  SUBJECT TO COMPLETION, DATED April 2, 1997

 PROSPECTUS                        $75,000,000

                       PUBLIC SERVICE COMPANY OF OKLAHOMA
                         JUNIOR SUBORDINATED DEBENTURES
                               ------------------

                                  PSO CAPITAL I
                                 PSO CAPITAL II
                              PREFERRED SECURITIES
                       GUARANTEED, AS DESCRIBED HEREIN, BY
                       PUBLIC SERVICE COMPANY OF OKLAHOMA
                               ------------------

         Public Service Company of Oklahoma, an Oklahoma corporation ("PSO"),
may from time to time offer in one or more series or issuances its junior
subordinated deferrable interest debentures (the "Junior Subordinated
Debentures"). The Junior Subordinated Debentures will be unsecured and
subordinate and junior in right of payment to Senior Indebtedness (as defined
herein) of PSO. See "Description of the Junior Subordinated
Debentures--Subordination." If provided in a related prospectus supplement
accompanying this Prospectus (the "Prospectus Supplement"), PSO will have the
right to defer payments of interest on any series of Junior Subordinated
Debentures at any time or from time to time for such number of consecutive
interest payment periods (which shall not extend beyond the maturity of the
Junior Subordinated Debentures) with respect to each deferral period as may be
specified in the Prospectus Supplement (each, an "Extension Period"). See
"Description of Junior Subordinated Debentures--Option to Extend Interest
Payments" and "--Certain Covenants of PSO."

         PSO Capital I and PSO Capital II, each a statutory business trust
created under the laws of the State of Delaware (each, an "Issuer Trust," and
collectively, the "Issuer Trusts"), may severally offer, from time to time,
their respective preferred securities (the "Preferred Securities") representing
preferred undivided beneficial interests in the assets of each Issuer Trust. PSO
will be the owner of the common securities (the "Common Securities")
representing common undivided beneficial interests in the assets of each Issuer
Trust. The payment of periodic cash distributions ("Distributions") with respect
to Preferred Securities of each Issuer Trust, and payments on liquidation or
redemption with respect to such Preferred Securities are each guaranteed by PSO
as described herein (each, a "Guarantee," and collectively, the "Guarantees").
See "Description of Guarantees." PSO's obligations under each Guarantee will be
subordinate and junior in right of payment to all Senior Indebtedness of PSO.
Concurrently with the issuance by an Issuer Trust of its Preferred Securities,
such Issuer Trust will invest the proceeds thereof and any contributions made
                                                       (CONTINUED ON NEXT PAGE)
                              --------------------

            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 date of this Prospectus is           , 1997



(CONTINUED FROM PREVIOUS PAGE)

by PSO in respect of PSO's purchase of the Common Securities in a corresponding
series of Junior Subordinated Debentures (the "Corresponding Junior Subordinated
Debentures") with terms corresponding to the terms of such Issuer Trust's
Preferred Securities. The Corresponding Junior Subordinated Debentures will be
the sole assets of each Issuer Trust, and payments under the Corresponding
Junior Subordinated Debentures and the related Expense Agreement (as defined
herein) will be the only revenue of each Issuer Trust. PSO may redeem the
Corresponding Junior Subordinated Debentures (and cause the redemption of the
related Preferred Securities) or may terminate each Issuer Trust at any time and
cause the Corresponding Junior Subordinated Debentures to be distributed to the
holders of Preferred Securities in liquidation of their interests in such Issuer
Trust. See "Description of Preferred Securities--Liquidation Distribution Upon
Termination."

         Holders of the Preferred Securities will be entitled to receive
preferential cumulative cash Distributions accumulating from the date of
original issuance and payable periodically as specified in the related
Prospectus Supplement. If provided in the related Prospectus Supplement, PSO
will have the right to defer payments of interest on any series of Junior
Subordinated Debentures at any time or from time to time for one or more
Extension Periods (which shall not extend beyond the maturity of such Junior
Subordinated Debentures). If Corresponding Junior Subordinated Debentures are
issued and interest payments on such Corresponding Junior Subordinated
Debentures are so deferred, Distributions on the related series of Preferred
Securities will also be deferred and PSO will not be permitted, subject to
certain exceptions set forth herein, to declare, set aside or pay any cash
distributions with respect to PSO's capital stock or debt securities that rank
PARI PASSU with or junior to the Corresponding Junior Subordinated Debentures.
During an Extension Period, interest on the Corresponding Junior Subordinated
Debentures will continue to accrue (and the amount of Distributions to which
holders of Preferred Securities are entitled will accumulate) at the rate per
annum set forth in the related Prospectus Supplement. See "Description of Junior
Subordinated Debentures--Option to Extend Interest Payment Date" and "--Certain
Covenants of PSO" and "Description of Preferred Securities--Distributions."

         The Junior Subordinated Debentures and the Preferred Securities (the
"Offered Securities") may be offered in amounts, at prices and on terms to be
determined at the time of offering, PROVIDED that the aggregate initial public
offering price of all Junior Subordinated Debentures (other than Corresponding
Junior Subordinated Debentures) and Preferred Securities shall not exceed
$75,000,000. Certain specific terms of the Offered Securities will be described
in the Prospectus Supplement, including, without limitation and where applicable
and to the extent not set forth herein: (i) in the case of Junior Subordinated
Debentures, the specific designation, aggregate principal amount, denominations,
maturity (including any provision for shortening thereof), interest payment
dates, interest rate (which may be fixed or variable) or method of calculating
interest, if any, applicable Extension Period or interest deferral terms, if
any, place or places where principal, premium, if any, and interest, if any,
will be payable, terms of redemption, if any, sinking fund provisions, if any,
terms for conversion or exchange, if any, into other securities, the initial
offering or purchase price, methods of distribution and any other special terms;
and (ii) in the case of Preferred Securities, the identity of the Issuer Trust,
specific title, aggregate amount, stated liquidation preference, distribution
rate or the method of calculating such rate, applicable Extension Period or
Distribution deferral terms, if any, dates on which and place or places where
Distributions will be payable, voting rights, any redemption provisions, terms
for any conversion or exchange into other securities, initial offering or
purchase price, methods of distribution, and any other special terms.

         The Prospectus Supplement will also contain information, as applicable,
concerning certain United States federal income tax considerations relating to
the Offered Securities.

         The Offered Securities may be sold directly by PSO, PSO Capital I
and/or PSO Capital II, as the case may be (each, an "Issuer"), through agents
designated from time to time or through underwriters or dealers. See "Plan of
Distribution." If any agents of an Issuer or underwriters are involved in the
sale of any Offered Securities in respect of which this Prospectus is being
delivered, the names of such agents or underwriters and any applicable
commissions or discounts will be set forth in a Prospectus Supplement. The net
proceeds to an Issuer or Issuers, as the case may be, from such sale also will
be set forth in a Prospectus Supplement or Prospectus Supplements. The
Prospectus Supplement will state whether the Offered Securities will be listed
on any national securities exchange or the Nasdaq National Market. If the
Offered Securities are not listed on any national securities exchange or the
Nasdaq National Market, there can be no assurance that there will be a liquid
secondary market for such Offered Securities.

         This Prospectus may not be used to consummate sales of Offered
Securities unless accompanied by a Prospectus Supplement relating to such
Offered Securities.



                              AVAILABLE INFORMATION

         PSO 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 (including
proxy and information statements) filed by PSO can be inspected and copied at
public reference facilities maintained by the Commission at 450 Fifth Street,
N.W., Room 1024, Washington, D.C. 20549, and at the following Regional Offices
of the Commission: New York Regional Office, 7 World Trade Center, 13th Floor,
New York, New York 10048, and Chicago Regional Office, Citicorp Center, 500 W.
Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such material can
be obtained from the Public Reference Section of the Commission at 450 Fifth
Street, N.W., Washington, D.C. 20549, upon payment of the prescribed rates. The
Commission also maintains a web site (http://www.sec.gov.) that contains
reports, proxy statements and other information regarding PSO.

         PSO and the Issuer Trusts have filed with the Commission a joint
Registration Statement under the Securities Act of 1933, as amended (the
"Securities Act"), with respect to the securities offered hereby. This
Prospectus does not contain all of the information set forth in such
Registration Statement and the exhibits thereto, certain portions of which have
been omitted as permitted by the rules and regulations of the Commission. For
further information with respect to PSO, the Issuer Trusts and the Offered
Securities, reference is hereby made to such Registration Statement, including
the exhibits thereto, which may be examined at the Commission's principal
office, 450 Fifth Street, N.W., Washington, D.C. 20549 or through the
Commission's home page on the Internet, or copies of which may be obtained from
the Commission at such office upon payment of the fees prescribed by the
Commission. Statements made in this Prospectus concerning the contents of any
documents referred to herein are not necessarily complete, and in each instance
are qualified in all respects by reference to the copy of such document filed as
an exhibit to the Registration Statement.

         No separate financial statements of the Issuer Trusts have been
included herein. PSO and the Issuer Trusts do not consider that such financial
statements would be material to holders of Preferred Securities offered hereby
because each Issuer Trust is a newly formed special purpose entity, has no
operating history, has no independent operations and is not engaged in, and does
not propose to engage in, any activity other than as set forth below.
Furthermore, taken together, PSO's obligations under each series of
Corresponding Junior Subordinated Debentures, the Indenture, the related Trust
Agreement, the related Expense Agreement and the related Guarantee, provide in
the aggregate, a guarantee of Distributions and other amounts due on the related
Preferred Securities of the Issuer Trusts. See "The Issuer Trusts," "Description
of the Preferred Securities," "Description of Guarantees" and "Description of
Corresponding Junior Subordinated Debentures." In addition, PSO does not expect
that any of the Issuer Trusts will be filing reports under the Exchange Act with
the Commission.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

         PSO's Annual Report on Form 10-K for the year ended December 31, 1996
filed by PSO with the Commission pursuant to the Exchange Act is incorporated in
this Prospectus by reference.

        All documents filed by PSO pursuant to Section 13(a), 13(c), 14 or 15(d)
of the Exchange Act after the date of this Prospectus and prior to the
termination of this offering shall be deemed to be incorporated by reference in
this Prospectus and to be a part hereof from the date of filing of such
documents (such documents, and the documents enumerated above, being hereinafter
referred to as "Incorporated Documents"; PROVIDED, HOWEVER, that all documents
subsequently filed by PSO pursuant to Section 13 or 14 of the Exchange Act in
each year during which the offering made by this Prospectus is in effect prior
to the filing with the Commission of PSO's Annual Report on Form 10-K covering
such year shall not be Incorporated Documents or be incorporated by reference in
this Prospectus or be a part hereof from and after such filing of such Annual
Report on Form 10-K).

         Any statement contained in an Incorporated Document shall be deemed to
be modified or superseded for purposes of this Prospectus to the extent that a
statement contained herein or in any other subsequently filed Incorporated
Document modifies or supersedes such statement. Any such statement so modified
or superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Prospectus.

         PSO HEREBY UNDERTAKES TO PROVIDE WITHOUT CHARGE TO EACH PERSON TO WHOM
A COPY OF THIS PROSPECTUS IS DELIVERED, ON THE WRITTEN OR ORAL REQUEST OF ANY
SUCH PERSON, A COPY OF ANY OR ALL OF THE INCORPORATED DOCUMENTS, OTHER THAN
EXHIBITS TO SUCH DOCUMENTS, UNLESS SUCH EXHIBITS ARE SPECIFICALLY INCORPORATED
BY REFERENCE THEREIN. REQUESTS SHOULD BE DIRECTED TO CENTRAL AND SOUTH WEST
CORPORATION, 1616 WOODALL RODGERS FREEWAY, DALLAS, TEXAS 75202, ATTENTION:
DIRECTOR, FINANCE, TELEPHONE NUMBER (214) 777-1000. THE INFORMATION RELATING TO
PSO CONTAINED IN THIS PROSPECTUS DOES NOT PURPORT TO BE COMPREHENSIVE AND SHOULD
BE READ TOGETHER WITH THE INFORMATION CONTAINED IN THE INCORPORATED DOCUMENTS.

         NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATION NOT CONTAINED IN THIS PROSPECTUS OR IN ANY PROSPECTUS SUPPLEMENT,
AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION SHOULD NOT BE RELIED
UPON AS HAVING BEEN AUTHORIZED. THIS PROSPECTUS AND ANY PROSPECTUS SUPPLEMENT DO
NOT CONSTITUTE 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 AND THE 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 PSO OR ITS
SUBSIDIARIES SINCE THE DATE OF THIS PROSPECTUS OR THE DATE OF THE LATEST
PROSPECTUS SUPPLEMENT, AS THE CASE MAY BE.

                       PUBLIC SERVICE COMPANY OF OKLAHOMA

         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. PSO
serves approximately 473,000 retail customers in the eastern and southwestern
Oklahoma area. Central and South West Corporation ("CSW"), a registered public
utility holding company under the Public Utility Holding Company Act of 1935, as
amended, owns all of the issued and outstanding Common Stock of PSO. PSO's
executive offices are located at 212 East Sixth Street, Tulsa, Oklahoma
74119-1212, telephone number (918) 599-2000.

         The foregoing information relating to PSO does not purport to be
comprehensive and should be read together with the financial statements and
other information contained in the Incorporated Documents.

                                THE ISSUER TRUSTS

         Each Issuer Trust is a statutory business trust created under Delaware
law pursuant to (i) a trust agreement executed by PSO, as depositor of such
Issuer Trust, the Delaware Trustee (as defined herein) of such Issuer Trust, the
Property Trustee (as defined herein) of such Issuer Trust and the Administrative
Trustees (as defined herein) of such Issuer Trust and (ii) the filing of a
certificate of trust with the Delaware Secretary of State. Each trust agreement
will be amended and restated in its entirety (each, as so amended and restated,
a "Trust Agreement") substantially in the form filed as an exhibit to the
Registration Statement of which this Prospectus forms a part. Each Trust
Agreement will be qualified as an indenture under the Trust Indenture Act of
1939, as amended (the "Trust Indenture Act"). Each Issuer Trust exists for the
exclusive purposes of (i) issuing and selling its Preferred Securities and
Common Securities, (ii) using the proceeds from the sale of such Preferred
Securities and Common Securities to acquire a corresponding series of
Corresponding Junior Subordinated Debentures issued by PSO and (iii) engaging in
only those other activities necessary, convenient or incidental thereto.
Accordingly, such Corresponding Junior Subordinated Debentures will be the sole
assets of such Issuer Trust, and payments under such Corresponding Junior
Subordinated Debentures and the related Expense Agreement (as defined herein)
will be the sole source of revenue of such Issuer Trust.

         All of the Common Securities of each Issuer Trust will be owned by PSO.
The Common Securities of an Issuer Trust will rank PARI PASSU, and payments will
be made thereon PRO RATA, with the Preferred Securities of such Issuer Trust,
except that upon the occurrence and continuance of an event of default under a
Trust Agreement resulting from a Debenture Event of Default (as defined herein),
the rights of PSO as holder of the Common Securities to payment in respect of
Distributions and payments upon liquidation, redemption or otherwise will be
subordinated to the rights of the holders of the Preferred Securities of such
Issuer Trust. See "Description of Preferred Securities--Subordination of Common
Securities." PSO will acquire Common Securities having an aggregate Liquidation
Amount (as defined herein) equal to not less than 3% of the total capital of
each Issuer Trust.

         Unless otherwise specified in the applicable Prospectus Supplement,
each Issuer Trust has a term of up to 45 years, but may terminate earlier as
provided in the applicable Trust Agreement. Each Issuer Trust's business and
affairs are conducted by its trustees, which will be appointed by PSO as holder
of the Common Securities.

         Unless otherwise specified in the applicable Prospectus Supplement, the
trustees will be The Bank of New York, as Property Trustee, (the "Property
Trustee"), The Bank of New York (Delaware), as the Delaware Trustee (the
"Delaware Trustee"), and two individual trustees (the "Administrative Trustees")
who are employees or officers of or affiliated with PSO (collectively, the
"Issuer Trustees"). The Bank of New York, as Property Trustee, will act as sole
indenture trustee under each Trust Agreement for purposes of compliance with the
Trust Indenture Act. The Bank of New York will also act as trustee under the
Guarantee and the Indenture (each as defined herein). See "Description of
Guarantees" and "Description of Junior Subordinated Debentures." The holder of
the Common Securities, or the holders of a majority in liquidation preference of
the Preferred Securities if a Debenture Event of Default under the Trust
Agreement has occurred and is continuing, will be entitled to appoint, remove or
replace the Property Trustee and/or the Delaware Trustee. In no event will the
holders of the Preferred Securities have the right to vote to appoint, remove or
replace the Administrative Trustees; such voting rights are vested exclusively
in the holder of the Common Securities. The duties and obligations of each
Issuer Trustee are governed by the applicable Trust Agreement. PSO will pay all
fees and expenses related to each Issuer Trust and the offering of the Preferred
Securities and will pay, directly or indirectly, all ongoing costs, expenses and
liabilities of each Issuer Trust. The principal executive office of each Issuer
Trust is 212 East Sixth Street, Tulsa, Oklahoma 74119-2121; telephone number
(918) 599-2000.

                                 USE OF PROCEEDS

         Unless otherwise indicated in the Prospectus Supplement, the net
proceeds to be received by PSO from the issuance and sale of the Junior
Subordinated Debentures (including Corresponding Junior Subordinated Debentures
issued to the Issuer Trusts in connection with the investment by the Issuer
Trusts of all of the proceeds from the sale of Preferred Securities) will
initially become part of the general funds of PSO and will be used to replace or
retire, through redemption, repurchase or otherwise, one or more series of
outstanding first mortgage bonds or preferred stock, or any combination thereof,
to repay all or a portion of PSO's short-term borrowings outstanding at the time
of issuance of the Offered Securities and for other general corporate purposes,
subject to applicable regulatory requirements. Reference is made to the
Incorporated Documents with respect to PSO's capital requirements and its
general financing plans. Each Issuer Trust will invest all proceeds received
from the sale of Preferred Securities in Corresponding Junior Subordinated
Debentures.

          CONSOLIDATED RATIOS OF EARNINGS TO FIXED CHARGES AND EARNINGS
             TO COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDEND
                                  REQUIREMENTS

          The  following  table sets forth PSO's ratio of earnings to fixed
          charges  and ratio of earnings to fixed  charges and  preferred  stock
          dividend requirements for the years indicated:


                             Year Ended December 31,

                                  1996      1995      1994    1993    1992
                                  ----      ----      ----    ----    ----


Earnings to Fixed Charges         2.45      4.32      4.03    2.78     2.95
Earnings to Combined Fixed
  Charges and Preferred
  Stock Dividend
  Requirements (unaudited)        2.37      4.18      3.69    2.68     2.85



         For computation of the foregoing ratios: (i) earnings consist of net
income plus fixed charges, federal and state income taxes, deferred income taxes
and investment tax credits and (ii) fixed charges consist of interest on
long-term debt, other interest charges, the interest component of leases and
amortization of debt discount, premium and expense. Pretax earnings required for
preferred stock dividends were computed using the effective tax rate for the
applicable year.


                  DESCRIPTION OF JUNIOR SUBORDINATED DEBENTURES

         The Junior Subordinated Debentures may be issued from time to time in
one or more series under an Indenture dated as of , as supplemented and amended
from time to time (the "Indenture"), between PSO and The Bank of New York, as
trustee (the "Debenture Trustee"). The Corresponding Junior Subordinated
Debentures may be issued from time to time in one or more series of
Corresponding Junior Subordinated Debentures under the Indenture between PSO and
the Debenture Trustee. PSO may issue Junior Subordinated Debentures to the
public or to institutional investors as described under "Plan of Distribution"
or Corresponding Junior Subordinated Debentures to the Issuer Trusts in
connection with the issuance of Preferred Securities. The following summary is
subject to the provisions of and is qualified by reference to the Indenture,
which is filed as an exhibit to the Registration Statement of which this
Prospectus forms a part, and to the Trust Indenture Act. Whenever particular
provisions or defined terms in the Indenture are referred to herein or in a
Prospectus Supplement, such provisions or defined terms are incorporated herein
or therein by reference. Section and Article references used herein are
references to provisions of the Indenture unless otherwise noted. Except as
otherwise provided herein, this summary of certain terms and provisions of
Junior Subordinated Debentures is also applicable to the Corresponding Junior
Subordinated Debentures. For additional terms and provisions applicable only to
the Corresponding Junior Subordinated Debentures, see "Description of
Corresponding Junior Subordinated Debentures."

GENERAL

         Each series of Junior Subordinated Debentures will rank PARI PASSU with
all other series of Junior Subordinated Debentures, will be unsecured and will
be subordinated and junior in right of payment to the extent and in the manner
set forth in the Indenture to all Senior Indebtedness (as defined below) of PSO.
See "--Subordination." As the Junior Subordinated Debentures will be issued by
PSO, the Junior Subordinated Debentures effectively will be subordinate to all
obligations of any PSO subsidiaries, and the rights of PSO's creditors,
including holders of Junior Subordinated Debentures, to participate in the
assets of such subsidiaries upon liquidation or reorganization will be junior to
the rights of the holders of all preferred stock, indebtedness and other
liabilities of such subsidiaries, which may include trade payables, obligations
to banks under credit facilities, guarantees, pledges, support arrangements,
bonds, capital leases, notes and other obligations. PSO currently has no
subsidiaries. Except as otherwise provided in the applicable Prospectus
Supplement, the Indenture does not limit the incurrence or issuance of other
secured or unsecured debt of PSO, whether under the Indenture, any other
indenture that PSO may enter into in the future or otherwise. See
"--Subordination" and the Prospectus Supplement relating to any offering of
Preferred Securities or Junior Subordinated Debentures.

         The Indenture provides that Junior Subordinated Debentures may be
issued from time to time in one or more series pursuant to an indenture
supplemental to the Indenture or a resolution of PSO's Board of Directors or an
Officer's Certificate (each, a "Supplemental Indenture"). (Section 2.01) The
Indenture does not limit the aggregate principal amount of Junior Subordinated
Debentures that may be issued thereunder. PSO's Restated Certificate of
Incorporation, as amended (the "Articles"), currently limit the amount of
unsecured debt that PSO may issue to (i) the equivalent of 20% of the total of
all secured indebtedness and total equity or (ii) as to unsecured debt maturing
in less than ten years, the equivalent of 10% of such aggregate. PSO is
currently seeking to amend its Articles to eliminate such limitations. The
Indenture does not contain any provisions that would limit the ability of PSO to
incur indebtedness or that would afford holders of Junior Subordinated
Debentures protection in the event of a highly leveraged or similar transaction
involving PSO or in the event of a change of control.

         Reference is made to the Prospectus Supplement for the following terms
of the series of Junior Subordinated Debentures being offered thereby: (i) the
specific title of such Junior Subordinated Debentures; (ii) any limit on the
aggregate principal amount of such Junior Subordinated Debentures; (iii) the
date or dates on which the principal of such Junior Subordinated Debentures is
payable or the method of determination thereof (including any provision for the
shortening thereof); (iv) the rate or rates at which such Junior Subordinated
Debentures will bear interest, if any, or the manner of calculation of such rate
or rates; (v) the date or dates from which such interest shall accrue, the
interest payment dates on which such interest will be payable or the manner of
determination of such interest payment dates and the record dates for the
determination of holders to whom interest is payable on any such interest
payment dates; (vi) the right, if any, of PSO to extend or defer the interest
payment periods and the duration of such extension or deferral; (vii) the period
or periods within which, the price or prices at which and the terms and
conditions upon which such Junior Subordinated Debentures may be redeemed, in
whole or in part, at the option of PSO; (viii) the obligation, if any, of PSO to
redeem or purchase such Junior Subordinated Debentures pursuant to any sinking
fund or analogous provisions or at the option of a holder thereof and the period
or periods during which, the price or prices at which and the terms and
conditions upon which such Junior Subordinated Debentures shall be redeemed or
purchased, in whole or part, pursuant to such obligation; (ix) the form of such
Junior Subordinated Debentures; (x) if other than denominations of $25 or any
integral multiple thereof, the denominations in which such Junior Subordinated
Debentures shall be issuable; (xi) whether such Junior Subordinated Debentures
are issuable as a global security, and in such case, the identity of the
depositary; and (xii) any and all other terms with respect to such series not
inconsistent with the provisions of the Indenture. (Section 2.01)

SUBORDINATION

         The Indenture provides that Junior Subordinated Debentures are
subordinate and junior in right of payment to the prior payment in full of all
Senior Indebtedness of PSO, whether outstanding on the date of such issuance of
Junior Subordinated Debentures or thereafter incurred, as provided in the
Indenture. No payment of principal of (including redemption and sinking fund
payments), or premium, if any, or interest on, the Junior Subordinated
Debentures may be made if any Senior Indebtedness is not paid when due, any
applicable grace period with respect to such default has ended and such default
has not been cured or waived, or if the maturity of any Senior Indebtedness has
been accelerated because of a default. Upon any payment or distribution of
assets to creditors upon any dissolution, winding-up, liquidation or
reorganization of PSO, whether voluntary or involuntary or in bankruptcy,
insolvency, receivership or other proceedings, all amounts due or to become due
on all Senior Indebtedness must be paid in full before the holders of the Junior
Subordinated Debentures are entitled to receive or retain any payment. The
rights of the holders of the Junior Subordinated Debentures will be subrogated
to the rights of the holders of Senior Indebtedness to receive payments or
distributions applicable to Senior Indebtedness until all amounts owing on the
Junior Subordinated Debentures are paid in full. (Sections 14.01 to 14.04) The
Junior Subordinated Debentures effectively will also be subordinate to all
obligations of PSO's subsidiaries, if any. See "--General."

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

         (a) all indebtedness of PSO evidenced by notes, debentures, bonds or
other securities sold by PSO for money;

         (b) all indebtedness of others of the kinds described in paragraph (a)
above assumed by or guaranteed in any manner by PSO or in effect guaranteed by
PSO through an agreement to purchase, contingent or otherwise;

         (c) all renewals, extensions or refundings of indebtedness of the kinds
described in either of paragraphs (a) and (b) above; and

         (d) all payments of money relating to any lease which is capitalized on
the balance sheet or consolidated balance sheet, as the case may be, of PSO or
its subsidiaries, if any, in accordance with generally accepted accounting
principles as in effect from time to time;

unless, in the case of any particular indebtedness, renewal, extension,
refunding or lease payment, the instrument creating or evidencing the same or
the assumption or guarantee of the same expressly provides that such
indebtedness, renewal, extension, refunding or lease payment is not superior in
right of payment to or is PARI PASSU with the Junior Subordinated Debentures.
Such Senior Indebtedness shall continue to be Senior Indebtedness and entitled
to the benefits of the subordination provisions contained in the Indenture
irrespective of any amendment, modification or waiver of any term of such Senior
Indebtedness. (Section 1.01)

         The Indenture does not limit the aggregate amount of Senior
Indebtedness which may be issued. As of December 31, 1996, Senior Indebtedness
of PSO aggregated approximately $485.2 million. PSO expects from time to time to
incur additional indebtedness constituting Senior Indebtedness.

CERTAIN COVENANTS OF PSO

         If there shall have occurred any event that would, with the giving of
notice or the passage of time, or both, constitute a Debenture Event of Default
under the Indenture, as described under "--Debenture Events of Default" below,
or PSO exercises its option to extend or defer the interest payment period
described in clause (vi) under "--General" above, PSO will not, until all
defaulted interest on the Junior Subordinated Debentures and all interest
accrued on the Junior Subordinated Debentures during any such extended or
deferred interest payment period and all principal and premium, if any, then due
and payable on the Junior Subordinated Debentures shall have been paid in full,
(i) declare, set aside or pay any dividend or distribution on any capital stock
of PSO, except for dividends or distributions in shares of its capital stock or
in rights to acquire shares of its capital stock, or (ii) repurchase, redeem or
otherwise acquire, or make any sinking fund payment for the purchase or
redemption of, any shares of its capital stock (except by conversion into or
exchange for shares of its capital stock and except for a redemption, purchase
or other acquisition of shares of its capital stock made for the purpose of an
employee incentive plan or benefit plan of PSO or any of its subsidiaries and
except for mandatory redemption or sinking fund payments with respect to any
series of Preferred Stock of PSO that are subject to mandatory redemption or
sinking fund requirements, PROVIDED that the aggregate stated value of all such
series outstanding at the time of any such payment does not exceed five percent
of the aggregate of (1) the total principal amount of all bonds or other
securities representing secured indebtedness issued or assumed by PSO and then
outstanding and (2) the capital and surplus of PSO to be stated on the books of
account of PSO after giving effect to such payment); PROVIDED, HOWEVER, that any
moneys deposited in any sinking fund and not in violation of this provision may
thereafter be applied to the purchase or redemption of such Preferred Stock in
accordance with the terms of such sinking fund without regard to the
restrictions contained in this provision. (Section 4.06) As of October 31, 1996,
PSO had no such series of Preferred Stock outstanding. With respect to any
issuance of Corresponding Junior Subordinated Debentures in connection with the
issuance of Preferred Securities, PSO will make certain additional covenants as
described under "Description of Corresponding Junior Subordinated Debentures."

FORM, EXCHANGE, REGISTRATION AND TRANSFER

         Each series of Junior Subordinated Debentures will be issued in
registered form and in certificated form or will be represented by one or more
global securities. If not represented by one or more global securities, Junior
Subordinated Debentures may be presented for registration of transfer (with the
form of transfer endorsed thereon duly executed) or exchange, at the office of
the Registrar or at the office of any transfer agent designated by PSO for such
purpose with respect to any series of Junior Subordinated Debentures and
referred to in an applicable Prospectus Supplement, without service charge and
upon payment of any taxes and other governmental charges as described in the
Indenture. Such transfer or exchange will be effected upon the Registrar or such
transfer agent, as the case may be, being satisfied with the documents of title
and identity of the person making the request. (Section 2.05) If a Prospectus
Supplement refers to any transfer agent (in addition to the Registrar) initially
designated by PSO with respect to any series of Junior Subordinated Debentures,
PSO may at any time rescind the designation of any such transfer agent or
approve a change in the location through which any such transfer agent acts,
except that PSO will be required to maintain a transfer agent in each Place of
Payment for such series. (Section 4.02) PSO may at any time designate additional
transfer agents with respect to any series of Junior Subordinated Debentures.
The Junior Subordinated Debentures may be transferred or exchanged without
service charge, other than any tax or governmental charge imposed in connection
therewith. (Section 2.05)

         In the event of any redemption in part, PSO shall not be required to
(i) issue, register the transfer of or exchange any Junior Subordinated
Debenture during a period beginning at the opening of business 15 days before
any selection for redemption of Junior Subordinated Debentures of like tenor and
of the series of which such Junior Subordinated Debenture is a part, and ending
at the close of business on the earliest date on which the relevant notice of
redemption is deemed to have been given to all holders of Junior Subordinated
Debentures of like tenor and of such series to be redeemed and (ii) register the
transfer of or exchange any Junior Subordinated Debentures so selected for
redemption, in whole or in part, except the unredeemed portion of any Junior
Subordinated Debenture being redeemed in part. (Section 2.05)

PAYMENT AND PAYING AGENTS

         Unless otherwise indicated in the Prospectus Supplement, payment of
principal of and premium, if any, on any Junior Subordinated Debenture will be
made only against surrender to the Paying Agent of such Junior Subordinated
Debenture. Unless otherwise indicated in the Prospectus Supplement, principal of
and premium, if any, and interest on Junior Subordinated Debentures will be
payable, subject to any applicable laws and regulations, at the office of such
Paying Agent or Paying Agents as PSO may designate from time to time, except
that at the option of PSO payments on the Junior Subordinated Debentures may be
made (i) by checks mailed by the Debenture Trustee to the holders entitled
thereto at their registered addresses as specified in the Register for such
Junior Subordinated Debentures or (ii) to a holder of $1,000,000 or more in
aggregate principal amount of such Junior Subordinated Debentures who has
delivered a written request to the Debenture Trustee at least 14 days prior to
the relevant Interest Payment Date electing to have payments made by wire
transfer to a designated account in the United States, by wire transfer of
immediately available funds to such designated account; PROVIDED that, in either
case, the payment of principal with respect to any Junior Subordinated Debenture
will be made only upon surrender of such Junior Subordinated Debenture to the
Debenture Trustee. Unless otherwise indicated in the Prospectus Supplement,
payment of interest on a Junior Subordinated Debenture on any Interest Payment
Date will be made to the person in whose name such Junior Subordinated Debenture
(or Predecessor Junior Subordinated Debenture) is registered at the close of
business on the record date for such interest payment. (Sections 2.03 and 4.03)

         The Debenture Trustee will initially act as Paying Agent with respect
to the Junior Subordinated Debentures. PSO may at any time designate additional
Paying Agents or rescind the designation of any Paying Agents or approve a
change in the office through which any Paying Agent acts, except that PSO will
be required to maintain a Paying Agent in each Place of Payment for each series
of the Junior Subordinated Debentures. (Sections 4.02 and 4.03)

         All moneys paid by PSO to a Paying Agent for the payment of the
principal of or premium, if any, or interest on any Junior Subordinated
Debenture of any series that remain unclaimed at the end of two years after such
principal, premium, if any, or interest shall have become due and payable will
be repaid to PSO and the holder of such Junior Subordinated Debenture will
thereafter look only to PSO for payment thereof. (Section 11.06)

GLOBAL DEBENTURES

         The Junior Subordinated Debentures of a series may be issued in whole
or in part in the form of one or more global securities ("Global Junior
Subordinated Debentures") that will be deposited with, or on behalf of, a
depositary (the "Depositary") identified in the Prospectus Supplement relating
to such series. Global Junior Subordinated Debentures may be issued only in
fully registered form and in either temporary or permanent form. Unless and
until it is exchanged in whole or in part for the individual Junior Subordinated
Debentures represented thereby, a Global Junior Subordinated Debenture may not
be transferred except as a whole by the Depositary for such Global Junior
Subordinated Debenture to a nominee of such Depositary or by a nominee of such
Depositary to such Depositary or another nominee of such Depositary or by the
Depositary or any nominee to a successor Depositary or any nominee of such
successor Depositary. (Section 2.11)

         The specific terms of the depositary arrangement with respect to any
portion of a series of Junior Subordinated Debentures to be represented by a
Global Junior Subordinated Debenture will be described in the Prospectus
Supplement relating to such series. PSO anticipates that the following
provisions will generally apply to depositary arrangements.

         Upon the issuance of a Global Junior Subordinated Debenture, and the
deposit of such Global Junior Subordinated Debenture with or on behalf of the
Depositary, the Depositary for such Global Junior Subordinated Debenture or its
nominee will credit on its book-entry registration and transfer system, the
respective principal amounts of the individual Junior Subordinated Debentures
represented by such Global Junior Subordinated Debenture to the accounts of
persons that have accounts with such Depositary ("Participants"). Such accounts
shall be designated by the dealers, underwriters or agents with respect to such
Junior Subordinated Debentures or by PSO if such Junior Subordinated Debentures
are offered and sold directly by PSO. Ownership of beneficial interests in a
Global Junior Subordinated Debenture will be limited to Participants or persons
that may hold interests through Participants. Ownership of beneficial interests
in such Global Junior Subordinated Debenture will be shown on, and the transfer
of that ownership will be effected only through, records maintained by the
applicable Depositary or its nominee (with respect to interests of Participants)
and the records of Participants (with respect to interests of persons who hold
through Participants). The laws of some states may require that certain
purchasers of securities take physical delivery of such securities in definitive
form. Such limits and such laws may impair the ability to transfer beneficial
interests in a Global Junior Subordinated Debenture.

         So long as the Depositary for a Global Junior Subordinated Debenture,
or its nominee, is the registered owner of such Global Junior Subordinated
Debenture, such Depositary or such nominee, as the case may be, will be
considered the sole owner or holder of the Junior Subordinated Debentures
represented by such Global Junior Subordinated Debenture for all purposes under
the Indenture governing such Junior Subordinated Debentures. Except as provided
below, owners of beneficial interests in a Global Junior Subordinated Debenture
will not be entitled to have any of the individual Junior Subordinated
Debentures of the series represented by such Global Junior Subordinated
Debenture registered in their names, will not receive or be entitled to receive
physical delivery of any such Junior Subordinated Debentures of such series in
definitive form and will not be considered the owners or holders thereof under
the Indenture.

         Payments of principal of, premium, if any, and interest on individual
Junior Subordinated Debentures represented by a Global Junior Subordinated
Debenture registered in the name of a Depositary or its nominee will be made to
the Depositary or its nominee, as the case may be, as the registered owner of
the Global Junior Subordinated Debenture representing such Junior Subordinated
Debentures. None of PSO, the Debenture Trustee, any Paying Agent, or the
Registrar for such Junior Subordinated Debentures will have any responsibility
or liability for any aspect of the records relating to or payments made on
account of beneficial ownership interests of the Global Junior Subordinated
Debentures representing such Junior Subordinated Debentures or for maintaining,
supervising or reviewing any records relating to such beneficial ownership
interests.

         PSO expects that the Depositary for a series of Junior Subordinated
Debentures or its nominee, upon receipt of any payment of principal, premium, if
any, or interest in respect of a permanent Global Junior Subordinated Debenture
representing any of such Junior Subordinated Debentures, immediately will credit
Participants' accounts with payments in amounts proportionate to their
respective beneficial interests in the principal amount of such Global Junior
Subordinated Debenture representing such Junior Subordinated Debentures as shown
on the records of such Depositary or its nominee. PSO also expects that payments
by Participants to owners of beneficial interests in such Global Junior
Subordinated Debenture 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." Such payments will be the responsibility of such Participants.

         Unless otherwise specified in the applicable Prospectus Supplement, if
a Depositary for a series of Junior Subordinated Debentures is at any time
unwilling, unable or ineligible to continue as depositary and a successor
depositary is not appointed by PSO within 90 days, PSO will issue individual
Junior Subordinated Debentures of such series in exchange for the Global Junior
Subordinated Debenture representing such series of Junior Subordinated
Debentures. In addition, PSO may at any time and in its sole discretion, subject
to any limitations described in the Prospectus Supplement relating to such
Junior Subordinated Debentures, determine not to have any Junior Subordinated
Debentures of such series represented by one or more Global Junior Subordinated
Debentures and, in such event, will issue individual Junior Subordinated
Debentures of such series in exchange for the Global Junior Subordinated
Debenture representing such series of Junior Subordinated Debentures. Further,
if PSO so specifies with respect to the Junior Subordinated Debentures of a
series, an owner of a beneficial interest in a Global Junior Subordinated
Debenture representing Junior Subordinated Debentures of such series may, on
terms acceptable to PSO, the Debenture Trustee and the Depositary for such
Global Junior Subordinated Debenture, receive individual Junior Subordinated
Debentures of such series in exchange for such beneficial interest, subject to
any limitations described in the Prospectus Supplement relating to such Junior
Subordinated Debentures. In any such instance, an owner of a beneficial interest
in a Global Junior Subordinated Debenture will be entitled to physical delivery
of individual Junior Subordinated Debentures of the series represented by such
Global Junior Subordinated Debenture equal in principal amount to such
beneficial interest and to have such Junior Subordinated Debentures registered
in its name. Individual Junior Subordinated Debentures of such series so issued
will be issued in denominations, unless otherwise specified by PSO, of $25 and
integral multiples thereof. (Section 2.11)

REDEMPTION

         Unless otherwise indicated in the applicable Prospectus Supplement,
Junior Subordinated Debentures will not be subject to any sinking fund.

         The applicable Prospectus Supplement will specify the period or periods
within which, the price or prices at which and the terms and conditions upon
which the Junior Subordinated Debentures of any series may be redeemed, in whole
or in part, at the option of PSO. Junior Subordinated Debentures in
denominations larger than $25 may be redeemed in part but only in integral
multiples of $25. Except as otherwise specified in the applicable Prospectus
Supplement, the redemption price for any Junior Subordinated Debenture so
redeemed shall equal any accrued and unpaid interest thereon to the redemption
date, plus 100% of the principal amount thereof.

         Except as otherwise specified in the applicable Prospectus Supplement,
if a Debenture Tax Event (as defined below) in respect of a series of Junior
Subordinated Debentures shall occur and be continuing, PSO may, at its option,
redeem such series of Junior Subordinated Debentures in whole (but not in part)
at any time within 90 days of the occurrence of such Debenture Tax Event, at a
redemption price equal to 100% of the principal amount of such Junior
Subordinated Debentures then outstanding plus accrued and unpaid interest to the
date fixed for redemption.

         "Debenture Tax Event" means the receipt by PSO of an opinion of
counsel, rendered by a law firm having a recognized national tax and securities
practice, to the effect that, as a result of any amendment to, or change
(including any announced prospective change) in, the laws (or any regulations
thereunder) of the United States or any political subdivision or taxing
authority thereof or therein, or as a result of any official administrative
pronouncement or judicial decision interpreting or applying such laws or
regulations, which amendment or change is effective or such pronouncement or
decision is announced on or after the date of issuance of the applicable series
of Junior Subordinated Debentures under the Indenture, there is more than an
insubstantial risk that interest payable by PSO on such series of Junior
Subordinated Debentures is not, or within 90 days of the date of such opinion,
will not be, deductible by PSO, in whole or in part, for United States federal
income tax purposes.

         Notice of any redemption will be mailed at least 30 days but not more
than 60 days before the redemption date to each holder of Junior Subordinated
Debentures to be redeemed at its registered address (Section 3.02). Unless PSO
defaults in payment of the redemption price, on and after the redemption date
interest will cease to accrue on such Junior Subordinated Debentures or portions
thereof called for redemption.

OPTION TO EXTEND INTEREST PAYMENT DATE

         If provided in the applicable Prospectus Supplement, PSO shall have the
right at any time or from time to time during the term of any series of Junior
Subordinated Debentures to defer the payment of interest for such number of
consecutive interest payment periods with respect to each deferred period as may
be specified in the applicable Prospectus Supplement (each, an "Extension
Period"), subject to the terms, conditions and covenants, if any, specified in
such Prospectus Supplement, provided that such Extension Period may not extend
beyond the maturity of such series of Junior Subordinated Debentures. Certain
United States federal income tax consequences and special considerations
applicable to any such Junior Subordinated Debentures will be described in the
applicable Prospectus Supplement. In the event that PSO exercises this right,
certain restrictions will be applicable to PSO as described under "--Certain
Covenants of PSO."

AGREED TAX TREATMENT

         The Indenture provides that each holder of a Junior Subordinated
Debenture, each person that acquires a beneficial ownership interest in a Junior
Subordinated Debenture and PSO agree that for United States federal, state and
local tax purposes it is intended that such Junior Subordinated Debenture
constitute indebtedness. (Section 13.12)

MODIFICATION OF INDENTURE

         The Indenture contains provisions permitting PSO and the Debenture
Trustee, with the consent of the holders of not less than a majority in
principal amount of the Junior Subordinated Debentures of each series which are
affected by the modification, to modify the Indenture or any supplemental
indenture affecting that series or the rights of the holders of that series of
Junior Subordinated Debentures; PROVIDED that no such modification may, without
the consent of the holder of each outstanding Junior Subordinated Debenture
affected thereby, (i) extend the fixed maturity of any Junior Subordinated
Debentures of any series, or reduce the principal amount thereof, or reduce the
rate or extend the time of payment of interest thereon, or reduce any premium
payable upon the redemption thereof or (ii) reduce the percentage of Junior
Subordinated Debentures, the holders of which are required to consent to any
such supplemental indenture. (Section 9.02) In the case of Corresponding Junior
Subordinated Debentures, so long as any of the related series of Preferred
Securities remain outstanding, PSO will covenant in the applicable Supplemental
Indenture that no such modification may be made that adversely affects the
holders of such Preferred Securities in any material respect, and no termination
of the Indenture may occur, and no waiver of any Debenture Event of Default or
non-compliance with any covenant under the Indenture may be effective, without
the prior consent of the holders of at least a majority of the aggregate
liquidation preference of such Preferred Securities unless and until the
principal of the Corresponding Junior Subordinated Debentures and all accrued
and unpaid interest thereon have been paid in full and certain other conditions
are satisfied. See "Description of Corresponding Junior Subordinated
Debentures."

         In addition, PSO and the Debenture Trustee may execute, without the
consent of any holder of Junior Subordinated Debentures (including the Junior
Subordinated Debentures being offered hereby), any supplemental indenture for
certain other usual purposes, including the creation of any new series of Junior
Subordinated Debentures. (Sections 2.01, 9.01 and 10.01)

DEBENTURE EVENTS OF DEFAULT

         The Indenture provides that any one or more of the following described
events with respect to a series of Junior Subordinated Debentures, which has
occurred and is continuing, constitutes a "Debenture Event of Default" with
respect to such series of Junior Subordinated Debentures:

         (a) failure for 60 days to pay interest on the Junior Subordinated
Debentures of that series when due and payable (subject to PSO's right to defer
interest payments pursuant to an Extension Period as described under "--Option
to Extend Interest Payment Date"); or

         (b) failure for 3 days to pay principal of or premium, if any, on the
Junior Subordinated Debentures of that series when due whether at maturity, upon
redemption, by declaration or otherwise, or to make any sinking or analogous
fund payment if established with respect to that series; or

         (c) failure to observe or perform any other covenant (other than those
specifically relating to one or more other series of Junior Subordinated
Debentures) contained in the Indenture for 90 days after notice; or

         (d) a decree or order by a court having jurisdiction in the premises
shall have been entered adjudging PSO a bankrupt or insolvent, or approving as
properly filed a petition seeking liquidation or reorganization of PSO under the
Federal Bankruptcy Code or any other similar applicable federal or state law,
and such decree or order shall have continued unvacated and unstayed for a
period of 90 days; an involuntary case shall be commenced under such Code in
respect of PSO and shall continue undismissed for a period of 90 days or an
order for relief in such case shall have been entered; or a decree or order of a
court having jurisdiction in the premises shall have been entered for the
appointment on the ground of insolvency or bankruptcy of a receiver, custodian,
liquidator, trustee or assignee in bankruptcy or insolvency of PSO or of its
property, or for the winding up or liquidation of its affairs, and such decree
or order shall have remained in force unvacated and unstayed for a period of 90
days; or

         (e) PSO shall institute proceedings to be adjudicated a voluntary
bankrupt, shall consent to the filing of a bankruptcy proceeding against it,
shall file a petition or answer or consent seeking liquidation or reorganization
under the Federal Bankruptcy Code or other similar applicable federal or state
law, shall consent to the filing of any such petition or shall consent to the
appointment on the ground of insolvency or bankruptcy of a receiver or custodian
or liquidator or trustee or assignee in bankruptcy or insolvency of it or of its
property, or shall make an assignment for the benefit of creditors; or

         (f) any other Event of Default specified with respect to the Junior
Subordinated Debentures of that series (Section 6.01).

         The holders of a majority in aggregate outstanding principal amount of
any series of the Junior Subordinated Debentures have the right to direct the
time, method and place of conducting any proceeding for any remedy available to
the Debenture Trustee for that series. (Section 6.06) The Debenture Trustee or
the holders of not less than 33% in aggregate outstanding principal amount of
any particular series of the Junior Subordinated Debentures may declare the
principal due and payable immediately upon a Debenture Event of Default with
respect to such series and, in the case of Corresponding Junior Subordinated
Debentures, should the Debenture Trustee or such holders of such Corresponding
Junior Subordinated Debentures fail to make such declaration, the holders of at
least 33% in aggregate liquidation preference of the related series of Preferred
Securities shall have such right.

         At any time after a declaration of acceleration with respect to the
Junior Subordinated Debentures of any series has been made and before a judgment
or decree for payment of the money due has been obtained, the Debenture Event or
Events of Default giving rise to such declaration of acceleration will, without
further act, be deemed to have been waived, and such declaration and its
consequences will, without further act, be deemed to have been rescinded and
annulled, if:

         (a) PSO has paid or deposited with the Debenture Trustee a sum
             sufficient to pay:

                  (1) all overdue interest on all Junior Subordinated Debentures
         of such series;

                  (2) the principal of and premium, if any, on any Junior
         Subordinated Debentures of such series which have become due otherwise
         than by such declaration of acceleration and interest thereon at the
         rate or rates prescribed therefor in such Junior Subordinated
         Debentures;

                  (3) interest upon overdue interest at the rate or rates
         prescribed therefor in such Junior Subordinated Debentures, to the
         extent that payment of such interest is lawful;

                  (4) all amounts due to the Debenture Trustee under the
         Indenture; and

         (b) any other Debenture Event or Events of Default with respect to
         Junior Subordinated Debentures of such series, other than the
         nonpayment of the principal of the Junior Subordinated Debentures of
         such series which has become due solely by such declaration of
         acceleration, have been cured or waived as provided in the Indenture.
         (Section 6.01)

         The holders of a majority in aggregate outstanding principal amount of
all series of the Junior Subordinated Debentures affected thereby may, on behalf
of the holders of all the Junior Subordinated Debentures of such series, waive
any past default, except a default in the payment of principal, premium, if any,
or interest. (Section 6.06) In the case of Corresponding Junior Subordinated
Debentures, should the holders of such Corresponding Junior Subordinated
Debentures fail to waive such default, the holders of a majority in aggregate
liquidation preference of the related series of Preferred Securities shall have
such right. PSO is required to file annually with the Debenture Trustee a
certificate as to whether or not PSO is in compliance with all the conditions
and covenants under the Indenture. (Section 5.03(d))

         In case a Debenture Event of Default shall occur and be continuing as
to a series of Corresponding Junior Subordinated Debentures, the Property
Trustee will have the right to declare the principal of and the interest on such
Corresponding Junior Subordinated Debentures and any other amounts payable under
the Indenture, to be forthwith due and payable and to enforce its other rights
as a creditor with respect to such Corresponding Junior Subordinated Debentures.

         If a Debenture Event of Default has occurred and is continuing and such
event is attributable to the failure of PSO to pay interest or principal on the
Corresponding Junior Subordinated Debentures on the date such interest or
principal is otherwise payable, then a holder of Preferred Securities may
institute a Direct Action (as defined below under "Description of Preferred
Securities--Enforcement of Certain Rights by Holders of Preferred Securities")
for payment after the respective due dates specified in the Corresponding Junior
Subordinated Debentures. PSO may not amend the Indenture to remove the foregoing
right to bring a Direct Action without the prior written consent of the holders
of all of the Preferred Securities. PSO shall be subrogated to the rights of the
holder of such Preferred Securities with respect to payments on the Preferred
Securities to the extent of any payments made by PSO to such holder in any
Direct Action.

         The holders of the Preferred Securities would not be able to exercise
directly any rights against PSO other than those set forth in the preceding
paragraph available to the holders of the Corresponding Junior Subordinated
Debentures unless the Property Trustee or the Debenture Trustee, acting for the
benefit of the Property Trustee, fails to do so for 60 days. In such event, to
the fullest extent permitted by law, the holders of at least 33% in aggregate
liquidation preference of the outstanding Preferred Securities would have the
right to directly institute proceedings for enforcement of such rights. See
"Description of Preferred Securities--Enforcement of Certain Rights by Holders
of Preferred Securities."

CONSOLIDATION, MERGER AND SALE

         The Indenture does not contain any covenant which restricts PSO's
ability to merge or consolidate with or into any other corporation, sell or
convey all or substantially all of its assets to any corporation or otherwise
engage in restructuring transactions. (Section 10.01)

CONVERSION OR EXCHANGE

         Unless otherwise indicated in the applicable Prospectus Supplement, the
Junior Subordinated Debentures of any series may be convertible or exchangeable
into Preferred Securities or other securities. The specific terms on which
Junior Subordinated Debentures of any series may be so converted or exchanged
will be set forth in the applicable Prospectus Supplement. Such terms may
include provisions for conversion or exchange, either mandatory, at the option
of the holder, or at the option of PSO, in which case the number of shares of
Preferred Securities or other securities to be received by the holders of Junior
Subordinated Debentures would be calculated as of a time and in the manner
stated in the applicable Prospectus Supplement.

DEFEASANCE AND DISCHARGE

         Under the terms of the Indenture, if PSO deposits with the Debenture
Trustee, in trust, moneys or Government Obligations, in an amount sufficient to
pay all the principal of, and interest on, the Junior Subordinated Debentures of
any series on the dates such payments are due in accordance with the terms of
such Junior Subordinated Debentures and if PSO delivers to the Debenture Trustee
an Opinion of Counsel to the effect that the holders of Junior Subordinated
Debentures of such series will not recognize income, gain or loss for federal
income tax purposes as a result of such deposit and the release of certain
obligations of the Company (as described below) and will be subject to federal
income tax on the same amount and in the same manner and at the same times as
would have been the case if such deposit and release had not occurred:

         (a) PSO will be released from substantially all of its covenants and
         other obligations contained in the Indenture and thereafter any failure
         to comply with any such covenant or obligation will not constitute a
         Default or a Debenture Event of Default with respect to the Junior
         Subordinated Debentures of such series;

         (b) the occurrence of an event described in clause (c) under "Debenture
         Events of Default" above will no longer constitute a Default or a
         Debenture Event of Default with respect to the Junior Subordinated
         Debentures of such series; and

         (c) the Junior Subordinated Debentures of such series will thereafter
         be deemed not to be outstanding for purposes of determining whether the
         holders of the requisite aggregate principal amount of Junior
         Subordinated Debentures have approved any amendment, modification or
         waiver with respect to any covenant or obligation described in clause
         (a) above or any event described in clause (b) above;

PROVIDED that the foregoing will not relieve PSO of its obligations to make
payments in respect of the Junior Subordinated Debentures of such series.

         In addition to discharging certain obligations under the Indenture as
stated above, if PSO delivers to the Debenture Trustee an Opinion of Counsel (in
lieu of the Opinion of Counsel referred to above) to the effect that (a) PSO has
received from, or there has been published by, the Internal Revenue Service a
ruling or (b) since the date of the Indenture there has been a change in
applicable federal income tax law, in either case to the effect that, and based
thereon such Opinion of Counsel shall confirm that, the holders of Junior
Subordinated Debentures of such series will not recognize income, gain or loss
for federal income tax purposes as a result of such deposit, defeasance and
discharge and will be subject to federal income tax on the same amount and in
the same manner and at the same times, as would have been the case if such
deposit, defeasance and discharge had not occurred, and (c) the trust resulting
from the defeasance is a valid trust and will not constitute a regulated
investment company under the Investment Company Act of 1940, as amended, then,
in such event, PSO will be deemed to have paid and discharged the entire
indebtedness on the Junior Subordinated Debentures (except as to any surviving
rights such as rights of registration of transfer or exchange expressly provided
for in the Indenture). In the event of any such defeasance and discharge of
Junior Subordinated Debentures of such series, holders of Junior Subordinated
Debentures of such series would be able to look only to such trust fund for
payment of principal of (and premium, if any) and interest, if any, on the
Junior Subordinated Debentures of such series. (Sections 11.01, 11.02 and 11.03)
Prospective investors are urged to consult their own tax advisors as to the
specific consequences to them of such deposit.

GOVERNING LAW

         The Indenture and the Junior Subordinated Debentures will be governed
by, and construed in accordance with, the laws of the State of New York.
(Section 13.04)

INFORMATION CONCERNING THE DEBENTURE TRUSTEE

         The Debenture Trustee, prior to default, undertakes to perform only
such duties as are specifically set forth in the Indenture and, after default,
shall exercise the same degree of care as a prudent individual would exercise in
the conduct of his or her own affairs. (Section 7.01) Subject to such provision,
the Debenture Trustee is under no obligation to exercise any of the powers
vested in it by the Indenture at the request of any holder of Junior
Subordinated Debentures, unless offered reasonable indemnity by such holder
against the costs, expenses and liabilities which might be incurred thereby.
(Section 7.02) The Debenture Trustee is not required to expend or risk its own
funds or otherwise incur personal financial liability in the performance of its
duties if the Debenture Trustee reasonably believes that repayment or adequate
indemnity is not reasonably assured to it. (Section 7.01)

         The Bank of New York serves as trustee and agent under agreements
involving PSO and its affiliates.

MISCELLANEOUS

         PSO will have the right at all times to assign any of its rights or
obligations under the Indenture to a direct or indirect wholly-owned subsidiary
of PSO; PROVIDED that, in the event of any such assignment, PSO will remain
liable for all such obligations. Subject to the foregoing, the Indenture will be
binding upon and inure to the benefit of the parties thereto and their
respective successors and permitted assigns. The Indenture provides that it may
not otherwise be assigned by the parties thereto. (Section 13.11)

                       DESCRIPTION OF PREFERRED SECURITIES

         The Preferred Securities and the Common Securities of each Issuer Trust
will be created pursuant to the terms of the Trust Agreement for each Issuer
Trust. The Preferred Securities of a particular issue will represent preferred
undivided beneficial interests in the assets of the related Issuer Trust and the
holders thereof will be entitled to a preference in certain circumstances with
respect to Distributions and amounts payable on redemption or liquidation over
the Common Securities of such Issuer Trust, as well as other benefits as
described in the corresponding Trust Agreement. This summary of certain
provisions of the Preferred Securities and each Trust Agreement does not purport
to be complete and is subject to, and is qualified in its entirety by reference
to, all the provisions of each Trust Agreement, including the definitions
therein of certain terms, and the Trust Indenture Act. Wherever particular
defined terms of a Trust Agreement (as supplemented or amended from time to
time) are referred to herein or in a Prospectus Supplement, such defined terms
are incorporated herein or therein by reference. The form of each Trust
Agreement has been filed as an exhibit to the Registration Statement of which
this Prospectus forms a part. Each of the Issuer Trusts is a legally separate
entity and the assets of one are not available to satisfy the obligations of any
of the others.

GENERAL

         The Preferred Securities of an Issuer Trust will rank PARI PASSU, and
payments will be made thereon PRO RATA, with the Common Securities of that
Issuer Trust except as described below under "--Subordination of Common
Securities." Legal title to the Corresponding Junior Subordinated Debentures
will be held by the Property Trustee in trust for the benefit of the holders of
the related Preferred Securities and Common Securities. Each Guarantee Agreement
executed by PSO for the benefit of the holders of an Issuer Trust's Preferred
Securities (each, a "Guarantee") will be a guarantee on a subordinated basis
with respect to the related Preferred Securities but will not guarantee payment
of Distributions or amounts payable on redemption or liquidation of such
Preferred Securities when the related Issuer Trust does not have funds on hand
available to make such payments. See "Description of Guarantees."

DISTRIBUTIONS

         Each Issuer Trust's Preferred Securities represent preferred undivided
beneficial interests in the assets of such Issuer Trust, and the Distributions
on each Preferred Security will be payable at a rate specified in the Prospectus
Supplement for such Preferred Securities. The amount of Distributions payable
for any period will be computed on the basis of a 360-day year of twelve 30-day
months unless otherwise specified in the applicable Prospectus Supplement.
Distributions to which holders of Preferred Securities are entitled will
accumulate additional Distributions ("Additional Amounts") if and as specified
in the applicable Prospectus Supplement. The term "Distributions" as used herein
includes any Additional Amounts unless otherwise stated.

         Distributions on the Preferred Securities will be cumulative, will
accumulate from the date of original issuance and will be payable on such dates
as specified in the applicable Prospectus Supplement. In the event that any date
on which Distributions are payable on the Preferred Securities is not a Business
Day (as defined below), payment of the Distribution payable on such date will be
made on the next succeeding day that is a Business Day (and without any interest
or other payment in respect of any such delay) except that, if such Business Day
is in the next succeeding calendar year, payment of such Distribution shall be
made on the immediately preceding Business Day, in each case with the same force
and effect as if made on such date (each date on which Distributions are payable
in accordance with the foregoing, a "Distribution Date"). A "Business Day" shall
mean any day other than a Saturday or a Sunday, or a day on which banking
institutions in The City of New York are authorized or required by law or
executive order to remain closed or a day on which the corporate trust office of
the Property Trustee or the Debenture Trustee is closed for business.

         If provided in the applicable Prospectus Supplement, PSO has the right
under the Indenture to defer the payment of interest on any series of the
Corresponding Junior Subordinated Debentures at any time or from time to time
for one or more Extension Periods, subject to the terms, conditions and
covenants, if any, specified in the applicable Prospectus Supplement, PROVIDED
that no Extension Period may extend beyond the maturity of such series of
Corresponding Junior Subordinated Debentures. As a consequence of any such
extension, Distributions on the corresponding Preferred Securities would be
deferred (but would continue to accumulate additional Distributions thereon at
the rate per annum set forth in the Prospectus Supplement for such Preferred
Securities) by the Issuer Trust of such Preferred Securities during any such
Extension Period. During such Extension Period PSO may not, and may not permit
any subsidiary of PSO to, (i) declare, set aside or pay any dividend or
distribution on, or repurchase, redeem, or otherwise acquire or make any sinking
fund payment with respect to, any shares of PSO's capital stock, including the
Common Stock of PSO, or (ii) make any payment of principal, interest or premium,
if any, on or repay, repurchase or redeem any debt securities that rank PARI
PASSU with or junior in interest to the Corresponding Junior Subordinated
Debentures or make any guarantee payments with respect to the foregoing (other
than (a) dividends or distributions in shares of its capital stock or in rights
to acquire shares of its capital stock, (b) conversions into or exchanges for
shares of its capital stock, (c) redemptions, purchases or other acquisitions of
shares of its capital stock made for the purpose of an employee incentive plan
or benefit plan of PSO or any of its subsidiaries and mandatory redemptions or
sinking fund payments with respect to any series of Preferred Stock of PSO that
are subject to mandatory redemption or sinking fund requirements, PROVIDED that
the aggregate stated value of all such series outstanding at the time of any
such payment does not exceed five percent of the aggregate of (1) the total
principal amount of all bonds or other securities representing secured
indebtedness issued or assumed by PSO and then outstanding and (2) the capital
and surplus of PSO to be stated on the books of account of PSO after giving
effect to such payment, PROVIDED, HOWEVER, that any moneys deposited in any
sinking fund and not in violation of this provision may thereafter be applied to
the purchase or redemption of such Preferred Stock in accordance with the terms
of such sinking fund without regard to the restrictions contained in this
provision, and (d) payments under any guarantee by PSO with respect to any
securities of a subsidiary of PSO, provided that the proceeds from the issuance
of such securities were issued to purchase Junior Subordinated Debentures of any
series under the Indenture). See "Description of Junior Subordinated
Debentures--Option to Extend Interest Payment Date," and "--Certain Covenants of
PSO" and "Description of Corresponding Junior Subordinated Debentures--Certain
Covenants of PSO."

         The revenue of each Issuer Trust available for distribution to holders
of its Preferred Securities will be limited to payments under the Corresponding
Junior Subordinated Debentures in which such Issuer Trust will invest the
proceeds from the issuance and sale of its Preferred Securities and its Common
Securities. See "Description of Corresponding Junior Subordinated Debentures."
If PSO does not make interest payments on such Corresponding Junior Subordinated
Debentures, the Property Trustee will not have funds available to pay
Distributions on the related Preferred Securities. The payment of Distributions
(if and to the extent the Issuer Trust has funds available for the payment of
such Distributions and cash sufficient to make such payments) is guaranteed by
PSO on a limited basis as set forth herein under "Description of Guarantees."

         Distributions on the Preferred Securities of each Issuer Trust will be
payable to the holders thereof as they appear on the register of such Issuer
Trust on the relevant record dates, which, as long as the Preferred Securities
remain in book-entry form, will be one Business Day prior to the relevant
Distribution Date. Subject to any applicable laws and regulations and the
provisions of the applicable Trust Agreement, each such payment will be made as
described under "--Book-entry Issuance." In the event any Preferred Securities
are not in book-entry form, the relevant record date for such Preferred
Securities shall be a date at least 15 days prior to the relevant Distribution
Date, as specified in the applicable Prospectus Supplement.

REDEMPTION OR EXCHANGE

         MANDATORY REDEMPTION. Upon the repayment or redemption, in whole or in
part, of any Corresponding Junior Subordinated Debentures, whether at maturity
or upon earlier redemption as provided in the Indenture, the proceeds from such
repayment or redemption shall be applied by the Property Trustee to redeem a
Like Amount (as defined below) of the related Preferred Securities and Common
Securities, upon not less than 30 nor more than 60 days' notice prior to the
date fixed for repayment or redemption (the "Redemption Date"), at a redemption
price equal to the aggregate liquidation preference of such Preferred Securities
plus accumulated and unpaid Distributions thereon to the Redemption Date (the
"Redemption Price") and the related amount of the premium, if any, paid by PSO
upon the concurrent redemption of such Corresponding Junior Subordinated
Debentures. See "Description of Corresponding Junior Subordinated Debentures
Optional Redemption." If less than all of any series of Corresponding Junior
Subordinated Debentures are to be repaid or redeemed on a Redemption Date, then
the proceeds from such repayment or redemption shall be allocated to the
redemption PRO RATA of the related Preferred Securities and the Common
Securities. The amount of premium, if any, paid by PSO upon the redemption of
all or any part of any series of any Corresponding Junior Subordinated
Debentures to be repaid or redeemed on a Redemption Date shall be allocated to
the redemption PRO RATA of the related Preferred Securities and the Common
Securities.

         PSO will have the right to redeem any series of Corresponding Junior
Subordinated Debentures at any time, in whole (but not in part), upon the
occurrence of a Tax Event or an Investment Company Event (each as defined below,
a "Special Event") and subject to the further conditions described under
"Description of Corresponding Junior Subordinated Debentures--Optional
Redemption." In addition, the applicable Prospectus Supplement will specify the
period or periods within which, the price or prices at which and the terms and
conditions upon which the Corresponding Junior Subordinated Debentures of any
series may be redeemed, in whole or in part, at the option of PSO. Corresponding
Junior Subordinated Debentures in denominations larger than $25 may be redeemed
in part but only in integral multiples of $25. Except as otherwise specified in
the applicable Prospectus Supplement, the Redemption Price for any Corresponding
Junior Subordinated Debenture so redeemed shall equal any accrued and unpaid
interest thereon to the Redemption Date, plus 100% of the principal amount
thereof.

SPECIAL EVENT REDEMPTION OR DISTRIBUTION OF CORRESPONDING
JUNIOR SUBORDINATED DEBENTURES.

         If a Special Event in respect of a series of Preferred Securities and
Common Securities shall occur and be continuing, PSO has the right to redeem the
Corresponding Junior Subordinated Debentures in whole (but not in part) and
thereby cause a mandatory redemption of such Preferred Securities and Common
Securities in whole (but not in part) within 90 days following the occurrence of
such Special Event at the Redemption Price. Whether or not a Special Event has
occurred, PSO has the right to terminate the related Issuer Trust at any time
and, after satisfaction of liabilities to creditors of such Issuer Trust, if
any, as provided by applicable law, cause such Corresponding Junior Subordinated
Debentures to be distributed to the holders of such Preferred Securities and
Common Securities in liquidation of the Issuer Trust. If PSO does not elect
either option described above, the applicable series of Preferred Securities
will remain outstanding and, in the event a Tax Event has occurred and is
continuing, Additional Sums (as defined below) may be payable on the
Corresponding Junior Subordinated Debentures.

         "Additional Sums" means the additional amounts as may be necessary in
order that the amount of Distributions then due and payable by an Issuer Trust
on the outstanding Preferred Securities and Common Securities of the Issuer
Trust shall not be reduced as a result of any additional taxes, duties and other
governmental charges to which such Issuer Trust has become subject as a result
of a Tax Event.

         "Investment Company Event" means the receipt by the applicable Issuer
Trust of an opinion of counsel, rendered by a law firm having a recognized
national tax and securities practice, to the effect that, as a result of the
occurrence of a change in law or regulation or a change in interpretation or
application of law or regulation by any legislative body, court, governmental
agency or regulatory authority (a "Change in 1940 Act Law") the applicable
Issuer Trust is or will be considered an "investment company" that is required
to be registered under the Investment Company Act of 1940, as amended (the
"Investment Company Act"), which Change in 1940 Act Law becomes effective on or
after the date of original issuance of the series of Preferred Securities issued
by the applicable Issuer Trust.

         "Like Amount" means (i) with respect to a redemption of any series of
Preferred Securities, Preferred Securities and Common Securities of such series
having a Liquidation Amount (as defined below) equal to that portion of the
principal amount of Corresponding Junior Subordinated Debentures to be
contemporaneously redeemed in accordance with the Indenture and the proceeds of
which will be used to pay the Redemption Price of such Preferred Securities and
Common Securities, and (ii) with respect to a distribution of Corresponding
Junior Subordinated Debentures to holders of any series of Preferred Securities
in connection with a termination or liquidation of the related Issuer Trust,
Corresponding Junior Subordinated Debentures having a principal amount equal to
the Liquidation Amount of the Preferred Securities or Common Securities of the
holder to whom such Corresponding Junior Subordinated Debentures are
distributed.

         "Liquidation Amount" means the stated amount of $25 per Preferred
Security and Common Security.

         "Tax Event" means the receipt by the applicable Issuer Trust of an
opinion of counsel, rendered by a law firm having a recognized national tax and
securities practice, to the effect that, as a result of any amendment to, or
change (including any announced prospective change) in, the laws (or any
regulations thereunder) of the United States, or any political subdivision or
taxing authority thereof or therein, or as a result of any official
administrative pronouncement or judicial decision interpreting or applying such
laws or regulations, which amendment or change is effective or which
pronouncement or decision is announced on or after the date of issuance of the
Preferred Securities under the related Trust Agreement, there is more than an
insubstantial risk that (i) the applicable Issuer Trust is, or will be within 90
days of the date of such opinion, subject to United States federal income tax
with respect to income received or accrued on the corresponding series of
Corresponding Junior Subordinated Debentures, (ii) interest payable by PSO on
such series of Corresponding Junior Subordinated Debentures is not, or within 90
days of the date of such opinion, will not be, deductible by PSO, in whole or in
part, for United States federal income tax purposes, or (iii) the applicable
Issuer Trust is, or will be within 90 days of the date of such opinion, subject
to more than a DE MINIMIS amount of other taxes, duties or other governmental
charges.

         After the liquidation date fixed for any distribution of Corresponding
Junior Subordinated Debentures for any series of Preferred Securities and Common
Securities (i) such series of Preferred Securities and Common Securities will no
longer be deemed to be outstanding, (ii) The Depository Trust Company ("DTC") or
its nominee, as the record holder of such series of Preferred Securities, will
receive a registered global certificate or certificates representing the
Corresponding Junior Subordinated Debentures to be delivered upon such
distribution and (iii) any certificates representing such series of Preferred
Securities not held by DTC or its nominee will be deemed to represent the
Corresponding Junior Subordinated Debentures having a principal amount equal to
the stated liquidation preference of such series of Preferred Securities, and
bearing accrued and unpaid interest in an amount equal to the accrued and unpaid
Distributions on such series of Preferred Securities until such certificates are
presented to the Administrative Trustees or their agent for transfer or
reissuance.

         There can be no assurance as to the market prices for the Preferred
Securities or the Corresponding Junior Subordinated Debentures that may be
distributed in exchange for Preferred Securities if a termination and
liquidation of an Issuer Trust were to occur. Accordingly, the Preferred
Securities that an investor may purchase, or the Corresponding Junior
Subordinated Debentures that the investor may receive on termination and
liquidation of an Issuer Trust, may trade at a discount to the price that the
investor paid to purchase the Preferred Securities offered hereby.

REDEMPTION PROCEDURES

         Preferred Securities redeemed on each Redemption Date shall be redeemed
at the Redemption Price with the applicable proceeds from the contemporaneous
redemption of the Corresponding Junior Subordinated Debentures. Redemptions of
the Preferred Securities shall be made and the Redemption Price shall be payable
on each Redemption Date only to the extent that the related Issuer Trust has
funds on hand available for the payment of such Redemption Price. See also
"--Subordination of Common Securities."

         If an Issuer Trust gives a notice of redemption in respect of its
Preferred Securities, then, by 12:00 noon, New York City time, on the Redemption
Date, to the extent funds are available, the Property Trustee will deposit
irrevocably with DTC, funds sufficient to pay the applicable Redemption Price
and will give DTC irrevocable instructions and authority to pay the Redemption
Price to the holders of such Preferred Securities. See "--Book-entry Issuance."
If such Preferred Securities are no longer in book-entry form, such Issuer
Trust, to the extent funds are available, will irrevocably deposit with the
paying agent for such Preferred Securities funds sufficient to pay the
applicable Redemption Price and will give such paying agent irrevocable
instructions and authority to pay the Redemption Price to the holders thereof
upon surrender of their certificates evidencing such Preferred Securities.
Notwithstanding the foregoing, Distributions payable on or prior to the
Redemption Date for any Preferred Securities called for redemption shall be
payable to the holder of such Preferred Securities as of the relevant record
dates for the related Distribution Dates. If notice of redemption shall have
been given and funds deposited as required, then upon the date of such deposit,
all rights of the holders of such Preferred Securities so called for redemption
will cease, except the right of the holders of such Preferred Securities to
receive the Redemption Price, but without interest on such Redemption Price, and
such Preferred Securities will cease to be outstanding. In the event that any
date fixed for redemption of Preferred Securities is not a Business Day, then
payment of the Redemption Price payable on such date will be made on the next
succeeding day which is a Business Day (and without any interest or other
payment in respect of any such delay), except that, if such Business Day falls
in the next calendar year, such payment will be made on the immediately
preceding Business Day. In the event that payment of the Redemption Price in
respect of Preferred Securities called for redemption is improperly withheld or
refused and not paid either by the Issuer Trust or by PSO pursuant to the
Guarantee as described under "Description of Guarantees," Distributions on such
Preferred Securities will continue to accrue at the then applicable rate, from
the Redemption Date originally established by the Issuer Trust for such
Preferred Securities to the date such Redemption Price is actually paid, in
which case the actual payment date will be the date fixed for redemption for
purposes of calculating the Redemption Price.

         Subject to applicable law (including, without limitation, United States
federal securities law), PSO or its subsidiaries, if any, may at any time and
from time to time purchase outstanding Preferred Securities by tender, in the
open market or by private agreement.

         Payment of the Redemption Price on the Preferred Securities and any
distribution of Corresponding Junior Subordinated Debentures to holders of
Preferred Securities shall be made to the applicable recordholders thereof as
they appear on the register for such Preferred Securities on the relevant record
date, which shall be one Business Day prior to the relevant Redemption Date or
liquidation date, as applicable; PROVIDED, HOWEVER, that in the event that any
Preferred Securities are not in book-entry form, the relevant record date for
such Preferred Securities shall be the fifteenth day prior to the Redemption
Date or liquidation date, as applicable, as specified in the applicable
Prospectus Supplement.

         If less than all of the Preferred Securities and Common Securities
issued by an Issuer Trust are to be redeemed on a Redemption Date, then the
aggregate Liquidation Amount of such Preferred Securities and Common Securities
to be redeemed shall be allocated PRO RATA among the Preferred Securities and
Common Securities. The particular Preferred Securities to be redeemed shall be
selected on a PRO RATA basis not more than 60 days prior to the Redemption Date
by the Property Trustee from the outstanding Preferred Securities not previously
called for redemption, by such method as the Property Trustee shall deem fair
and appropriate and which may provide for the selection for redemption of
portions (equal to $25 or an integral multiple of $25 in excess thereof) of the
liquidation preference of Preferred Securities of a denomination larger than
$25. The Property Trustee shall promptly notify the trust registrar in writing
of the Preferred Securities selected for redemption and, in the case of any
Preferred Securities selected for partial redemption, the liquidation preference
thereof to be redeemed. For all purposes of each Trust Agreement, unless the
context otherwise requires, all provisions relating to the redemption of
Preferred Securities shall relate, in the case of any Preferred Securities
redeemed or to be redeemed only in part, to the portion of the aggregate
liquidation preference of Preferred Securities which has been or is to be
redeemed.

         Notice of any redemption will be mailed at least 30 days but not more
than 60 days before the Redemption Date to each holder of Preferred Securities
to be redeemed at its registered address.

SUBORDINATION OF COMMON SECURITIES

         Payment of Distributions (including Additional Sums, if applicable) on,
and the Redemption Price of, each Issuer Trust's Preferred Securities and Common
Securities, as applicable, shall be made PRO RATA based on the Liquidation
Amount of such Preferred Securities and Common Securities; PROVIDED, HOWEVER,
that if on any Distribution Date or Redemption Date any Event of Default
resulting from a Debenture Event of Default shall have occurred and be
continuing, no payment of any Distribution (including Additional Sums, if
applicable) on, or Redemption Price of, any of the Issuer Trust's Common
Securities, and no other payment on account of the redemption, liquidation or
other acquisition of such Common Securities, shall be made unless payment in
full in cash of all accumulated and unpaid Distributions (including Additional
Amounts, if applicable) on all of the Issuer Trust's outstanding Preferred
Securities for all Distribution periods terminating on or prior thereto, or in
the case of payment of the Redemption Price the full amount of such Redemption
Price on all of the Issuer Trust's outstanding Preferred Securities then called
for redemption, shall have been made or provided for, and all funds available to
the Property Trustee shall first be applied to the payment in full in cash of
all Distributions (including Additional Sums, if applicable) on, or Redemption
Price of, the Issuer Trust's Preferred Securities then due and payable.

         In the case of any Event of Default resulting from a Debenture Event of
Default, PSO as holder of each Issuer Trust's Common Securities will be deemed
to have waived any right to act with respect to any such Event of Default under
the applicable Trust Agreement until the effect of all such Events of Default
with respect to such Preferred Securities have been cured, waived or otherwise
eliminated. Until any such Events of Default under the applicable Trust
Agreement with respect to the Preferred Securities have been so cured, waived or
otherwise eliminated, the Property Trustee shall act solely on behalf of the
holders of such Preferred Securities and not on behalf of PSO as holder of the
Common Securities, and only the holders of such Preferred Securities will have
the right to direct the Property Trustee to act on their behalf.

LIQUIDATION DISTRIBUTION UPON TERMINATION

         Pursuant to each Trust Agreement, each Issuer Trust shall automatically
terminate upon expiration of its term and shall be terminated on the first to
occur of: (i) certain events of bankruptcy, dissolution or liquidation of PSO;
(ii) the distribution of a Like Amount of the Corresponding Junior Subordinated
Debentures to the holders of its Preferred Securities and Common Securities if
PSO, as Depositor, has given written direction to the Property Trustee to
terminate such Issuer Trust (which direction is optional and wholly within the
discretion of PSO as Depositor); (iii) the redemption of all of such Issuer
Trust's Preferred Securities as described under "--Redemption or Exchange"; and
(iv) the entry by a court of competent jurisdiction of an order for the
dissolution of such Issuer Trust.

         If an early termination occurs as described in clause (i), (ii) or (iv)
above, such Issuer Trust shall be liquidated by the Issuer Trustees as
expeditiously as the Issuer Trustees determine to be possible by distributing,
after satisfaction of liabilities to creditors of such Issuer Trust as provided
by applicable law, to the holders of such Preferred Securities and Common
Securities a Like Amount of the Corresponding Junior Subordinated Debentures,
unless such distribution is determined by the Property Trustee not to be
practical, in which event such holders will be entitled to receive out of the
assets of the Issuer Trust available for distribution to holders, after
satisfaction of liabilities to creditors of such Issuer Trust as provided by
applicable law, an amount equal to, in the case of holders of Preferred
Securities, the aggregate of the liquidation preference plus accrued and unpaid
Distributions thereon to the date of payment (such amount being the "Liquidation
Distribution"). If such Liquidation Distribution can be paid only in part
because such Issuer Trust has insufficient assets available to pay in full the
aggregate Liquidation Distribution, then the amounts payable directly by such
Issuer Trust on its Preferred Securities shall be paid on a PRO RATA basis. The
holders of such Issuer Trust's Common Securities will be entitled to receive
distributions upon any such liquidation PRO RATA with the holders of its
Preferred Securities, except that if a Debenture Event of Default has occurred
and is continuing, such Preferred Securities shall have a priority over such
Common Securities. A supplemental indenture may provide that if an early
termination occurs as described in clause (iv) above, the Corresponding Junior
Subordinated Debentures may be subject to optional redemption in whole (but not
in part).

EVENTS OF DEFAULT; NOTICE

         Any one of the following events constitutes an "Event of Default" under
each Trust Agreement (an "Event of Default") with respect to the Preferred
Securities issued thereunder (whatever the reason for such Event of Default and
whether it shall be voluntary or involuntary or be effected by operation of law
or pursuant to any judgment, decree or order of any court or any order, rule or
regulation of any administrative or governmental body):

                  (i) the occurrence of a Debenture Event of Default under the
         Indenture with respect to the Corresponding Junior Subordinated
         Debentures (see "Description of Junior Subordinated Debentures--
         Debenture Events of Default"); or

                  (ii) default by an Issuer Trust in the payment of any
         Distribution with respect to Preferred Securities of that issue when it
         becomes due and payable, and continuation of such default for a period
         of 30 days; or

                  (iii) default by an Issuer Trust in the payment of any
         Redemption Price of any Preferred Security or Common Security of that
         issue when it becomes due and payable; or

                  (iv) default in the performance, or breach, in any material
         respect, of any covenant or warranty of the Issuer Trustees in such
         Trust Agreement (other than a covenant or warranty a default in the
         performance of which or the breach of which is dealt with in clause
         (ii) or (iii) above), and continuation of such default or breach for a
         period of 60 days after there has been given, by registered or
         certified mail, to the defaulting Issuer Trustee or Trustees by the
         holders of at least 33% in aggregate liquidation preference of the
         outstanding Preferred Securities of that issue, a written notice
         specifying such default or breach and requiring it to be remedied and
         stating that such notice is a "Notice of Default" under such Trust
         Agreement; or

                  (v) the occurrence of certain events of bankruptcy or
         insolvency with respect to the Property Trustee and the failure by PSO
         to appoint a successor Property Trustee within 60 days thereof.

         Within 15 Business Days after the occurrence of any Event of Default
actually known to the Property Trustee, the Property Trustee shall transmit
notice of such Event of Default to the holders of such Issuer Trust's Preferred
Securities, the Administrative Trustees and PSO, as Depositor, unless such Event
of Default shall have been cured or waived. PSO, as Depositor, and the
Administrative Trustees are required to file annually with the Property Trustee
a certificate as to whether or not they are in compliance with all the
conditions and covenants applicable to them under each Trust Agreement.

         If, in the event of a Debenture Event of Default, the Debenture Trustee
fails or the holders of not less than 33% in aggregate principal amount of the
Corresponding Junior Subordinated Debentures fail to declare the principal due
and payable, the holders of at least 33% in aggregate liquidation preference of
the related series of Preferred Securities shall have such right. Except as set
forth above, the existence of an Event of Default does not entitle the holders
of Preferred Securities to accelerate the maturity thereof or declare amounts
due and payable.

         If a Debenture Event of Default with respect to any Corresponding
Junior Subordinated Debentures has occurred and is continuing, the corresponding
Preferred Securities shall have a preference over the related Common Securities
upon termination of the applicable Issuer Trust as described above. See
"--Liquidation Distribution Upon Termination."

ENFORCEMENT OF CERTAIN RIGHTS BY HOLDERS OF PREFERRED SECURITIES

         If a Debenture Event of Default has occurred and is continuing, then
the holders of Preferred Securities would rely on the enforcement by the
Property Trustee or the Debenture Trustee, acting for the benefit of the
Property Trustee, of its rights as a holder of the Corresponding Junior
Subordinated Debentures against PSO. Notwithstanding the foregoing, if a
Debenture Event of Default has occurred and is continuing and such event is
attributable to the failure of PSO to pay interest or principal on the
Corresponding Junior Subordinated Debentures on the date such interest or
principal is otherwise payable (or in the case of redemption, on the redemption
date), then a holder of Preferred Securities may directly institute a proceeding
against PSO for enforcement of payment to such holder of the principal of or
interest on the Corresponding Junior Subordinated Debentures having a principal
amount equal to the aggregate liquidation preference of the Preferred Securities
of such holder (a "Direct Action") after the respective due dates specified in
the Corresponding Junior Subordinated Debentures. In connection with such Direct
Action, PSO will be subrogated to the rights of such holder of Preferred
Securities with respect to payments on the Preferred Securities to the extent of
any payment made by PSO to such holder of Preferred Securities in such Direct
Action.

         The holders of the Preferred Securities would not be able to exercise
directly against PSO any rights other than those set forth in the preceding
paragraph available to the holders of the Corresponding Junior Subordinated
Debentures unless the Property Trustee or the Debenture Trustee, acting for the
benefit of the Property Trustee, fails to do so for 60 days. In such event, to
the fullest extent permitted by law, the holders of at least 33% in aggregate
liquidation preference of the outstanding Preferred Securities would have the
right to directly institute proceedings for enforcement of such rights.

REMOVAL OF ISSUER TRUSTEES

         Unless a Debenture Event of Default with respect to any Corresponding
Junior Subordinated Debentures shall have occurred and be continuing, the
applicable Issuer Trustee may be removed at any time by the holder of the
related Common Securities. If such a Debenture Event of Default has occurred and
is continuing, the Property Trustee and the Delaware Trustee may be removed at
such time by the holders of a majority in Liquidation Amount of the outstanding
corresponding Preferred Securities. In no event will the holders of the
Preferred Securities have the right to vote to appoint, remove or replace the
Administrative Trustees, which voting rights are vested exclusively in PSO as
the holder of the Common Securities. No resignation or removal of an Issuer
Trustee and no appointment of a successor trustee shall be effective until the
acceptance of appointment by the successor trustee in accordance with the
provisions of the applicable Trust Agreement.

CO-TRUSTEES AND SEPARATE PROPERTY TRUSTEE

         Unless an Event of Default shall have occurred and be continuing, at
any time or times, for the purpose of meeting the legal requirements of the
Trust Indenture Act or of any jurisdiction in which any part of the applicable
Trust Property may at the time be located, PSO, as the holder of the Common
Securities, shall have power to appoint one or more persons either to act as a
co-trustee, jointly with the Property Trustee, of all or any part of such Trust
Property, or to act as separate trustee of any such property, in either case
with such powers as may be provided in the instrument of appointment, and to
vest in such person or persons in such capacity any property, title, right or
power deemed necessary or desirable, subject to the provisions of the applicable
Trust Agreement. In case a Debenture Event of Default with respect to any
Corresponding Junior Subordinated Debentures has occurred and is continuing, the
Property Trustee alone shall have power to make such appointment.

MERGER OR CONSOLIDATION OF ISSUER TRUSTEES

         Any entity into which the Property Trustee, the Delaware Trustee or any
Administrative Trustee that is not a natural person may be merged or converted
or with which it may be consolidated, or any entity resulting from any merger,
conversion or consolidation to which such Trustee shall be a party, or any
entity succeeding to all or substantially all the corporate trust business of
such Trustee, shall be the successor of such Trustee under each Trust Agreement,
provided such entity shall be otherwise qualified and eligible.

MERGERS, CONSOLIDATIONS, AMALGAMATIONS OR REPLACEMENTS OF THE ISSUER TRUSTS

         An Issuer Trust may not merge with or into, consolidate, amalgamate, or
be replaced by, or convey, transfer or lease its properties and assets
substantially as an entirety to any corporation or other Person, except as
described below. An Issuer Trust may, at the request of PSO, with the consent of
the Administrative Trustees and without the consent of the holders of the
Preferred Securities of such Issuer Trust, merge with or into, consolidate,
amalgamate, be replaced by or convey, transfer or lease its properties and
assets substantially as an entirety to a trust organized as such under the laws
of any State; PROVIDED that (i) such successor entity either (a) expressly
assumes all of the obligations of such Issuer Trust with respect to such
Preferred Securities or (b) substitutes for such Preferred Securities other
securities having substantially the same terms as such Preferred Securities (the
"Successor Securities") so long as the Successor Securities rank the same as
such Preferred Securities rank in priority with respect to distributions and
payments upon liquidation, redemption and otherwise, (ii) PSO expressly appoints
a trustee of such successor entity possessing the same powers and duties as the
Property Trustee as the holder of the Corresponding Junior Subordinated
Debentures, (iii) the Successor Securities are listed or traded, or any
Successor Securities will be listed or traded upon notification of issuance, on
any national securities exchange or other organization on which such Preferred
Securities are then listed, if any, (iv) such merger, consolidation,
amalgamation, replacement, conveyance, transfer or lease does not cause such
Preferred Securities (including any Successor Securities) to be downgraded by
any nationally recognized statistical rating organization, (v) such merger,
consolidation, amalgamation, replacement, conveyance, transfer or lease does not
adversely affect the rights, preferences and privileges of the holders of such
Preferred Securities (including any Successor Securities) in any material
respect, (vi) such successor entity has a purpose substantially identical to
that of such Issuer Trust, (vii) prior to such merger, consolidation,
amalgamation, replacement, conveyance, transfer or lease, PSO has received an
opinion from independent counsel to such Issuer Trust experienced in such
matters to the effect that (a) such merger, consolidation, amalgamation,
replacement, conveyance, transfer or lease does not adversely affect the rights,
preferences and privileges of the holders of such Preferred Securities
(including any Successor Securities) in any material respect, and (b) following
such merger, consolidation, amalgamation, replacement, conveyance, transfer or
lease, neither such Issuer Trust nor such successor entity will be required to
register as an "investment company" under the Investment Company Act and (viii)
PSO or any permitted successor or assignee owns all of the common securities of
such successor entity and guarantees the obligations of such successor entity
under the Successor Securities at least to the extent provided by the applicable
Guarantee. Notwithstanding the foregoing, an Issuer Trust shall not, except with
the consent of holders of 100% in aggregate liquidation preference of the
Preferred Securities of such Issuer Trust, consolidate, amalgamate, merge with
or into, be replaced by or convey, transfer or lease its properties and assets
substantially as an entirety to any other entity or permit any other entity to
consolidate, amalgamate, merge with or into, or replace it if such
consolidation, amalgamation, merger, replacement, conveyance, transfer or lease
would cause such Issuer Trust or the successor entity to be classified as other
than a "grantor trust" for United States federal income tax purposes.

VOTING RIGHTS; AMENDMENT OF TRUST AGREEMENT

         Except as provided below and under "Description of
Guarantees--Amendments and Assignment" and as otherwise required by law and the
applicable Trust Agreement, the holders of the Preferred Securities will have no
voting rights.

         Each Trust Agreement may be amended from time to time by PSO and the
Administrative Trustees, without the consent of the holders of the related
Preferred Securities, (i) to reflect the acceptance of appointment by a
successor Issuer Trustee, (ii) to cure any ambiguity, correct or supplement any
provisions in such Trust Agreement that may be inconsistent with any other
provision, or to make any other provisions with respect to matters or questions
arising under such Trust Agreement, that shall not be inconsistent with the
other provisions of such Trust Agreement, or (iii) to modify, eliminate or add
to any provisions of such Trust Agreement to such extent as shall be necessary
to ensure that the related Issuer Trust will be classified for United States
federal income tax purposes as a "grantor trust" at all times that any Preferred
Securities and Common Securities of such Issuer Trust are outstanding or to
ensure that such Issuer Trust will not be required to register as an "investment
company" under the Investment Company Act, PROVIDED, HOWEVER, that in the case
of clause (ii) above, such action shall not adversely affect in any material
respect the interests of any holder of Preferred Securities or Common Securities
of such Issuer Trust, and, in the case of clause (iii), any amendments of such
Trust Agreement shall become effective when notice thereof is given to the
holders of such Preferred Securities and Common Securities. Such Trust Agreement
may be amended by the Administrative Trustees and PSO with (i) the consent of
holders representing not less than a majority (based upon Liquidation Amounts)
of such outstanding Preferred Securities and Common Securities and (ii) receipt
by the Issuer Trustees of an opinion of counsel to the effect that such
amendment or the exercise of any power granted to the Issuer Trustees in
accordance with such amendment will not affect such Issuer Trust's status as a
"grantor trust" for United States federal income tax purposes or such Issuer
Trust's exemption from status as an "investment company" under the Investment
Company Act, PROVIDED, FURTHER that without the consent of each holder of such
Preferred Securities and Common Securities, such Trust Agreement may not be
amended to (i) change the amount or timing of any Distribution on such Preferred
Securities and Common Securities or otherwise adversely affect the amount of any
Distribution required to be made in respect of such Preferred Securities and
Common Securities as of a specified date or (ii) restrict the right of holders
of such Preferred Securities and Common Securities to institute suit for the
enforcement of any such payment on or after such date as described under
"--Events of Default; Notice" above.

         So long as any Corresponding Junior Subordinated Debentures are held by
the Property Trustee, the Issuer Trustees shall not (i) direct the time, method
and place of conducting any proceeding for any remedy available to the Debenture
Trustee or executing any trust or power conferred on the Property Trustee with
respect to such Corresponding Junior Subordinated Debentures, (ii) waive any
past default that is waivable under the Indenture, (iii) exercise any right to
rescind or annul a declaration that the principal of all the Corresponding
Junior Subordinated Debentures shall be due and payable or (iv) consent to any
amendment, modification or termination of the Indenture or such Corresponding
Junior Subordinated Debentures, where such consent shall be required, without,
in each case, obtaining the prior approval of the holders of a majority in
aggregate liquidation preference of all outstanding corresponding Preferred
Securities; PROVIDED, HOWEVER, that where a consent under the Indenture would
require the consent of each holder of Corresponding Junior Subordinated
Debentures affected thereby, no such consent shall be given by the Property
Trustee without the prior consent of each holder of the corresponding Preferred
Securities. The Issuer Trustees shall not revoke any action previously
authorized or approved by a vote of the holders of the Preferred Securities
except by subsequent vote of the holders of the Preferred Securities. The
Property Trustee shall notify each holder of record of the Preferred Securities
of any notice of default with respect to the Corresponding Junior Subordinated
Debentures. In addition to obtaining the foregoing approvals of the holders of
the Preferred Securities, prior to taking any of the foregoing actions, the
Issuer Trustees shall obtain an opinion of counsel experienced in such matters
to the effect that the applicable Issuer Trust will be classified as a "grantor
trust" and will not be classified as an association taxable as a corporation for
United States federal income tax purposes on account of such action.

         Any required approval of holders of Preferred Securities may be given
at a meeting of holders of Preferred Securities convened for such purpose or
pursuant to written consent. The Property Trustee will cause a notice of any
meeting at which holders of Preferred Securities are entitled to vote, or of any
matter upon which action by written consent of such holders is to be taken, to
be given to each holder of record of Preferred Securities in the manner set
forth in the applicable Trust Agreement.

         No vote or consent of the holders of Preferred Securities will be
required for an Issuer Trust to redeem and cancel its Preferred Securities in
accordance with the applicable Trust Agreement.

         Notwithstanding that holders of Preferred Securities are entitled to
vote or consent under any of the circumstances described above, any of the
Preferred Securities that are owned by PSO, the Issuer Trustees or any affiliate
of PSO or any Issuer Trustees shall, for purposes of such vote or consent, be
treated as if they were not outstanding.

PAYMENT AND PAYING AGENCY

         Payments in respect of the Preferred Securities shall be made to DTC,
which shall credit the relevant accounts at DTC on the applicable Distribution
Dates or, if any Issuer Trust's Preferred Securities are not held by DTC, such
payments shall be made by check mailed to the address of the holder entitled
thereto as such address shall appear on the Register. Unless otherwise specified
in the applicable Prospectus Supplement, the paying agent (the "Paying Agent")
shall initially be the Property Trustee and any co-paying agent chosen by the
Property Trustee and acceptable to the Administrative Trustees and PSO. The
Paying Agent shall be permitted to resign as Paying Agent upon 30 days' written
notice to the Property Trustee and PSO. In the event that the Property Trustee
shall no longer be the Paying Agent, the Administrative Trustees shall appoint a
successor (which shall be a bank or trust company acceptable to the Property
Trustee and PSO) to act as Paying Agent.

BOOK-ENTRY ISSUANCE

         DTC will act as securities depositary for all of the Preferred
Securities. The Preferred Securities will be issued only as fully-registered
securities registered in the name of Cede & Co. (DTC's nominee). One or more
fully-registered global certificates will be issued for the Preferred Securities
of each Issuer Trust, representing in the aggregate the total number of such
Issuer Trust's Preferred Securities, and will be deposited with DTC.

         DTC is a limited purpose trust company organized under the New York
Banking Law, a "banking organization" within the meaning of the New York Banking
Law, a member of the 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. DTC
holds securities that its participants deposit with DTC. DTC 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. Direct Participants include securities
brokers and dealers, banks, trust companies, clearing corporations and certain
other organizations ("Direct Participants"). DTC is owned by a number of its
Direct Participants and by the New York Stock Exchange, Inc., the American Stock
Exchange, Inc. and the National Association of Securities Dealers, Inc. Access
to the DTC system is also available to others such as securities brokers and
dealers, banks and trust companies that clear through or maintain custodial
relationships with Direct Participants, either directly or indirectly ("Indirect
Participants"). The rules applicable to DTC and its Participants are on file
with the Commission.

         Purchases of Preferred Securities within the DTC system must be made by
or through Direct Participants, which will receive a credit for the Preferred
Securities on DTC's records. The ownership interest of each actual purchaser of
each Preferred Security ("Beneficial Owner") is in turn to be recorded on the
Direct and Indirect Participants' records. Beneficial Owners will not receive
written confirmation from DTC of their purchases, but Beneficial Owners are
expected to receive written confirmations providing details of the transactions,
as well as periodic statements of their holdings, from the Direct or Indirect
Participants through which the Beneficial Owners purchased Preferred Securities.
Transfers of ownership interests in the Preferred Securities are to be
accomplished by entries made on the books of Participants acting on behalf of
Beneficial Owners. Beneficial Owners will not receive certificates representing
their ownership interests in Preferred Securities, except in the event that use
of the book-entry system for the Preferred Securities of such Issuer Trust is
discontinued.

         To facilitate subsequent transfers, all of the Preferred Securities
deposited by the Participants with DTC are registered in the name of DTC's
nominee, Cede & Co. The deposit of Preferred Securities with DTC and their
registration in the name of Cede & Co. effect no change in beneficial ownership.
DTC has no knowledge of the actual Beneficial Owners of the Preferred
Securities; DTC's records reflect only the identity of the Direct Participants
to whose accounts such Preferred Securities are credited, which may or may not
be the Beneficial Owners. The Participants will remain responsible for keeping
account of their holdings on behalf of their customers.

         Redemption notices shall be sent to Cede & Co. as the registered holder
of the Preferred Securities. If less than all of an Issuer Trust's Preferred
Securities are being redeemed, DTC's current practice is to determine by lot the
amount of the interest of each Direct Participant to be redeemed.

         Although voting with respect to the Preferred Securities is limited to
the holders of record of the Preferred Securities, in those instances in which a
vote is required, neither DTC nor Cede & Co. will itself consent or vote with
respect to Preferred Securities. Under its usual procedures, DTC would mail an
omnibus proxy (the "Omnibus Proxy") to the Property Trustee as soon as possible
after the record date. The Omnibus Proxy assigns Cede & Co.'s consenting or
voting rights to those Direct Participants to whose accounts such Preferred
Securities are credited on the record date (identified in a listing attached to
the Omnibus Proxy).

         Conveyance of notices and other communications by DTC to Direct
Participants, by Direct Participants to Indirect Participants, and by Direct
Participants and Indirect Participants to Beneficial Owners and the voting
rights of Direct Participants, Indirect Participants and Beneficial Owners will
be governed by arrangements among them, subject to any statutory or regulatory
requirements as may be in effect from time to time.

         Distribution payments on the Preferred Securities will be made by the
Property Trustee to DTC. DTC's practice is to credit Direct Participants'
accounts on the relevant payment date in accordance with their respective
holdings shown on DTC's records unless DTC has reason to believe that it will
not receive payments on such payment date. Payments by Participants to
Beneficial Owners will be governed by standing instructions and customary
practices and will be the responsibility of such Participant and not of DTC, the
Property Trustee, the Issuer Trust thereof or PSO, subject to any statutory or
regulatory requirements as may be in effect from time to time. Payment of
Distributions to DTC is the responsibility of the Property Trustee, disbursement
of such payments to Direct Participants is the responsibility of DTC, and
disbursements of such payments to the Beneficial Owners is the responsibility of
Direct and Indirect Participants.

         DTC may discontinue providing its services as securities depositary
with respect to any of the Preferred Securities at any time by giving reasonable
notice to the Property Trustee and PSO. In the event that a successor securities
depositary is not obtained, definitive Preferred Security certificates
representing such Preferred Securities are required to be printed and delivered.
PSO, at its option, may decide to discontinue use of the system of book-entry
transfers through DTC (or a successor depositary). After a Debenture Event of
Default, the holders of a majority in liquidation preference of Preferred
Securities may determine to discontinue the system of book-entry transfers
through DTC. In any such event, definitive certificates for such Issuer Trust's
Preferred Securities will be printed and delivered.

         The information in this section concerning DTC and DTC's book-entry
system has been obtained from sources that the Issuer Trusts and PSO believe to
be accurate, but the Issuer Trusts and PSO assume no responsibility for the
accuracy thereof. None of the Issuer Trusts, any Issuer Trustee nor PSO has any
responsibility for the performance by DTC or its Participants of their
respective obligations as described herein or under the rules and procedures
governing their respective operations.

REGISTRAR AND TRANSFER AGENT

         Unless otherwise specified in the applicable Prospectus Supplement, the
Property Trustee will act as registrar and transfer agent for the Preferred
Securities.

         Registration of transfers of Preferred Securities will be effected
without charge by or on behalf of each Issuer Trust, but upon payment of any tax
or other governmental charges that may be imposed in connection with any
transfer or exchange. The Issuer Trusts will not be required to register or
cause to be registered the transfer of their Preferred Securities after such
Preferred Securities have been called for redemption.

INFORMATION CONCERNING THE PROPERTY TRUSTEE

         The Property Trustee, other than during the occurrence and continuance
of an Event of Default, undertakes to perform only such duties as are
specifically set forth in each Trust Agreement and, after such Event of Default,
must exercise the same degree of care and skill as a prudent person would
exercise or use in the conduct of his or her own affairs. Subject to this
provision, the Property Trustee is under no obligation to exercise any of the
powers vested in it by the applicable Trust Agreement at the request of any
holder of Preferred Securities unless it is offered reasonable indemnity against
the costs, expenses and liabilities that might be incurred thereby. If no Event
of Default has occurred and is continuing and the Property Trustee is required
to decide between alternative causes of action, construe ambiguous provisions in
the applicable Trust Agreement or is unsure of the application of any provision
of the applicable Trust Agreement, and the matter is not one on which holders of
Preferred Securities are entitled under such Trust Agreement to vote, then the
Property Trustee shall take such action as is directed by PSO and if not so
directed, shall take such action as it deems advisable and in the best interests
of the holders of the Preferred Securities and the Common Securities and will
have no liability except for its own bad faith, negligence or willful
misconduct.

MISCELLANEOUS

         The Administrative Trustees are authorized and directed to conduct the
affairs of and to operate the Issuer Trusts in such a way that no Issuer Trust
will be deemed to be an "investment company" required to be registered under the
Investment Company Act or classified as an association taxable as a corporation
for United States federal income tax purposes and so that the Corresponding
Junior Subordinated Debentures will be treated as indebtedness of PSO for United
States federal income tax purposes. In this connection, PSO and the
Administrative Trustees are authorized to take any action, not inconsistent with
applicable law, the certificate of trust of each Issuer Trust or each Trust
Agreement, that PSO and the Administrative Trustees determine in their
discretion to be necessary or desirable for such purposes, as long as such
action does not materially adversely affect the interests of the holders of the
related Preferred Securities.

         Holders of the Preferred Securities have no preemptive or similar
rights.

         No Issuer Trust may borrow money or issue debt or mortgage or pledge
any of its assets.

                            DESCRIPTION OF GUARANTEES

         Each Guarantee will be executed and delivered by PSO concurrently with
the issuance by each Issuer Trust of its Preferred Securities for the benefit of
the holders from time to time of such Preferred Securities. The Bank of New York
will act as indenture trustee ("Guarantee Trustee") under each Guarantee for the
purposes of compliance with the Trust Indenture Act and each Guarantee will be
qualified as an indenture under the Trust Indenture Act. This summary of certain
provisions of the Guarantees does not purport to be complete and is subject to,
and qualified in its entirety by reference to, all of the provisions of each
Guarantee, including the definitions therein of certain terms, and the Trust
Indenture Act. The form of each Guarantee has been filed as an exhibit to the
Registration Statement of which this Prospectus forms a part. Reference in this
summary to the Preferred Securities and the Issuer Trust mean the Preferred
Securities of an Issuer Trust and such Issuer Trust, respectively, to which a
Guarantee relates. The Guarantee Trustee will hold each Guarantee for the
benefit of the holders of the related Issuer Trust's Preferred Securities.

GENERAL

         PSO will irrevocably agree to pay in full on a subordinated basis, to
the extent set forth herein, the Guarantee Payments (as defined below) to the
holders of the Preferred Securities, as and when due, regardless of any defense,
right of set-off or counterclaim that such Issuer Trust may have or assert other
than the defense of payment. The following payments with respect to the
Preferred Securities, to the extent not paid by or on behalf of the related
Issuer Trust (the "Guarantee Payments"), will be subject to the Guarantees: (i)
any accumulated and unpaid Distributions required to be paid on such Preferred
Securities, to the extent that such Issuer Trust has funds on hand available
therefor, (ii) the Redemption Price with respect to any Preferred Securities
called for redemption to the extent that such Issuer Trust has funds on hand
available therefor, and (iii) upon a voluntary or involuntary termination,
winding up or liquidation of such Issuer Trust (unless the Corresponding Junior
Subordinated Debentures are distributed to holders of such Preferred
Securities), the lesser of (a) the Liquidation Amount plus accumulated and
unpaid Distributions on the Preferred Securities to the date of payment to the
extent that such Issuer Trust has funds on hand available therefor and (b) the
amount of assets of such Issuer Trust remaining available for distribution to
holders of Preferred Securities. PSO's obligation to make a Guarantee Payment
may be satisfied by direct payment of the required amounts by PSO to the holders
of the applicable Preferred Securities or by causing the Issuer Trust to pay
such amounts to such holders.

         Each Guarantee will be an irrevocable guarantee on a subordinated basis
of the related Issuer Trust's obligations under the Preferred Securities, but
will apply only to the extent that such related Issuer Trust has funds
sufficient to make such payments, and is not a guarantee of collection.

         If PSO does not make interest payments on the Corresponding Junior
Subordinated Debentures held by the Issuer Trust, it is expected the Issuer
Trust will not be able to pay Distributions on the Preferred Securities and will
not have funds available therefor. Each Guarantee will rank subordinate and
junior in right of payment to all Senior Indebtedness of PSO. See "--Status of
the Guarantees." Except as otherwise provided in the applicable Prospectus
Supplement, the Guarantees do not limit the incurrence or issuance of other
secured or unsecured debt of PSO, whether under the Indenture or any existing or
other indenture that PSO may enter into in the future or otherwise.

         PSO has, through the applicable Guarantee, the applicable Trust
Agreement, the Junior Subordinated Debentures, the Indenture and the Expense
Agreements (as defined below), taken together, fully, irrevocably and
unconditionally guaranteed all of the Issuer Trust's obligations under the
Preferred Securities. No single document standing alone or operating in
conjunction with fewer than all of the other documents constitutes such a
guarantee. It is only the combined operation of these documents that has the
effect of providing a full, irrevocable and unconditional guarantee of the
Issuer Trust's obligations under the Preferred Securities. See "Relationship
Among the Preferred Securities, the Corresponding Junior Subordinated Debentures
and the Guarantees."

STATUS OF THE GUARANTEES

         Each Guarantee will constitute an unsecured obligation of PSO and will
rank subordinate and junior in right of payment to all Senior Indebtedness of
PSO.

         Each Guarantee will rank PARI PASSU with all other Guarantees issued by
PSO. Each Guarantee will constitute a guarantee of payment and not of collection
(i.e., the guaranteed party may institute a legal proceeding directly against
PSO to enforce its rights under the Guarantee without first instituting a legal
proceeding against any other person or entity). Each Guarantee will be held for
the benefit of the holders of the related Preferred Securities. Each Guarantee
will not be discharged except by payment of the related Guarantee Payments in
full to the extent not paid by the related Issuer Trust or upon distribution to
the holders of the Preferred Securities of the Corresponding Junior Subordinated
Debentures. None of the Guarantees places a limitation on the amount of
additional Senior Indebtedness that may be incurred by PSO. PSO may, from time
to time, incur additional indebtedness constituting Senior Indebtedness.

AMENDMENTS AND ASSIGNMENT

         Except with respect to any changes which do not materially adversely
affect the rights of holders of the related Preferred Securities (in which case
no vote will be required), no Guarantee may be amended without the prior
approval of the holders of not less than a majority of the aggregate Liquidation
Amount of such outstanding Preferred Securities. The manner of obtaining any
such approval will be as set forth under "Description of the Preferred
Securities -- Voting Rights; Amendment of Trust Agreement." All guarantees and
agreements contained in each Guarantee shall bind the successors, assigns,
receivers, trustees and representatives of PSO and shall inure to the benefit of
the holders of the related Preferred Securities then outstanding.

EVENTS OF DEFAULT

         An event of default under each Guarantee will occur upon the failure of
PSO to perform any of its payment or other obligations thereunder. The holders
of not less than a majority in aggregate Liquidation Amount of the related
Preferred Securities have the right to direct the time, method and place of
conducting any proceeding for any remedy available to the Guarantee Trustee in
respect of such Guarantee or to direct the exercise of any trust or power
conferred upon the Guarantee Trustee under such Guarantee.

         Any holder of the related Preferred Securities may institute a legal
proceeding directly against PSO to enforce its rights under such related
Guarantee without first instituting a legal proceeding against the Issuer Trust,
the Guarantee Trustee or any other person or entity.

         PSO, as guarantor, is required to file annually with the Guarantee
Trustee a certificate as to whether or not PSO is in compliance with all the
conditions and covenants applicable to it under the Guarantees.

INFORMATION CONCERNING THE GUARANTEE TRUSTEE

         The Guarantee Trustee, other than during the occurrence and continuance
of a default by PSO in performance of any Guarantee, undertakes to perform only
such duties as are specifically set forth in each Guarantee and, after default
with respect to any Guarantee, must exercise the same degree of care and skill
as a prudent person would exercise or use in the conduct of his or her own
affairs. Notwithstanding this provision, the Guarantee Trustee is under no
obligation to exercise any of the powers vested in it by any Guarantee at the
request of any holder of any Preferred Securities unless it is offered
reasonable indemnity against the costs, expenses and liabilities that might be
incurred thereby.

TERMINATION OF THE GUARANTEES

         Each Guarantee will terminate and be of no further force and effect
upon full payment of the Redemption Price of the related Preferred Securities,
upon full payment of the amounts payable upon liquidation of the related Issuer
Trust or upon distribution of Corresponding Junior Subordinated Debentures to
the holders of the related Preferred Securities. Each Guarantee will continue to
be effective or will be reinstated, as the case may be, if at any time any
holder of the related Preferred Securities must restore payment of any sums paid
under such Preferred Securities or such Guarantee.

GOVERNING LAW

         Each Guarantee will be governed by and construed in accordance with the
laws of the State of New York.

THE EXPENSE AGREEMENTS

         Pursuant to the related Agreement as to Expenses and Liabilities
entered into by PSO under each Trust Agreement (the "Expense Agreement"), PSO
will, as holder of the Common Securities, irrevocably and unconditionally
guarantee to each person or entity to whom the Issuer Trust becomes indebted or
liable, the full payment of any costs, expenses or liabilities of the Issuer
Trust, other than obligations of the Issuer Trust to pay to the holders of any
Preferred Securities or other similar interests in the Issuer Trust the amounts
due such holders pursuant to the terms of the Preferred Securities or such other
similar interests, as the case may be.

                          DESCRIPTION OF CORRESPONDING
                         JUNIOR SUBORDINATED DEBENTURES

         The Corresponding Junior Subordinated Debentures are to be issued in
one or more series under the Indenture with terms corresponding to the terms of
the related Preferred Securities. For a summary of certain terms and provisions
of Junior Subordinated Debentures that, except where noted, pertains in all
respects to the Corresponding Junior Subordinated Debentures, see "Description
of Junior Subordinated Debentures." This summary of certain terms and provisions
of, or relating to, Corresponding Junior Subordinated Debentures and the
Indenture does not purport to be complete and is subject to, and is qualified in
its entirety by reference to, the Indenture, the form of which is filed as an
exhibit to the Registration Statement of which this Prospectus forms a part, and
to the Trust Indenture Act. Whenever particular defined terms of the Indenture
(as supplemented or amended from time to time) are referred to herein or in a
Prospectus Supplement, such defined terms are incorporated herein or therein by
reference.

GENERAL

         Concurrently with the issuance of each Issuer Trust's Preferred
Securities, such Issuer Trust will invest the proceeds thereof and the
consideration paid by PSO for the Common Securities in a series of Corresponding
Junior Subordinated Debentures issued by PSO to such Issuer Trust. Each series
of Corresponding Junior Subordinated Debentures will be in the principal amount
equal to the aggregate stated Liquidation Amount of the related Preferred
Securities plus PSO's concurrent investment in the Common Securities and will
rank PARI PASSU with all other series of Junior Subordinated Debentures. The
Corresponding Junior Subordinated Debentures will be unsecured and subordinate
and junior in right of payment to the extent and in the manner set forth in the
Indenture to all Senior Indebtedness of PSO. See "Description of Junior
Subordinated Debentures--Subordination" and the Prospectus Supplement relating
to any offering of related Preferred Securities.

OPTIONAL REDEMPTION

         The applicable Prospectus Supplement will specify the period or periods
within which, the price or prices at which and the terms and conditions upon
which the Corresponding Junior Subordinated Debentures of any series may be
redeemed, in whole or in part, at the option of PSO. Except as otherwise set
forth in the applicable Prospectus Supplement, the redemption price for any
Corresponding Junior Subordinated Debentures so redeemed shall be equal to any
accrued and unpaid interest thereon to the date fixed for redemption, plus 100%
of the principal amount thereof. See "Description of Junior Subordinated
Debentures--Redemption."

         If a Special Event in respect of an Issuer Trust shall occur and be
continuing, PSO may, at its option, redeem the Corresponding Junior Subordinated
Debentures at any time within 90 days of the occurrence of such Special Event,
in whole but not in part, subject to the provisions of the Indenture. The
redemption price for any Corresponding Junior Subordinated Debentures shall be
equal to 100% of the principal amount of such Corresponding Junior Subordinated
Debentures then outstanding plus accrued and unpaid interest to the date fixed
for redemption.

         For so long as the applicable Issuer Trust is the holder of all the
outstanding series of Corresponding Junior Subordinated Debentures, the proceeds
of any such redemption will be used by the Issuer Trust to redeem the related
Preferred Securities in accordance with their terms. PSO may not redeem a series
of Corresponding Junior Subordinated Debentures in part unless all accrued and
unpaid interest has been paid in full on all outstanding Corresponding Junior
Subordinated Debentures of such series for all interest periods terminating on
or prior to the Redemption Date.

CERTAIN COVENANTS OF PSO

         PSO will covenant in the applicable Supplemental Indenture as to each
series of Corresponding Junior Subordinated Debentures, that if and so long as
(i) the Issuer Trust of the corresponding series of Preferred Securities and
Common Securities is the holder of all such Corresponding Junior Subordinated
Debentures, (ii) a Tax Event in respect of such Issuer Trust has occurred and is
continuing and (iii) PSO has elected, and has not revoked such election, to pay
Additional Sums in respect of such Preferred Securities and Common Securities,
PSO will pay to such Issuer Trust such Additional Sums. PSO will also covenant,
as to each series of Corresponding Junior Subordinated Debentures, that it will
not, and will not permit any subsidiary of PSO to, (i) declare, set aside or pay
any dividend or distribution on, or repurchase, redeem or otherwise acquire, or
make any sinking fund payment for the purchase or redemption of, any shares of
its capital stock, including the Common Stock of PSO, or (ii) make any payment
of principal, interest or premium, if any, on or repay or repurchase or redeem
any debt securities (including other Corresponding Junior Subordinated
Debentures) that rank PARI PASSU with or junior in interest to the Corresponding
Junior Subordinated Debentures or make any guarantee payments with respect to
the foregoing (other than (a) dividends or distributions in shares of its
capital stock or in rights to acquire shares of its capital stock, (b)
conversions into or exchanges for shares of its capital stock, (c) redemptions,
purchases or other acquisitions of shares of its capital stock made for the
purpose of an employee incentive plan or benefit plan of PSO or any of its
subsidiaries and mandatory redemptions or sinking fund payments with respect to
any series of Preferred Stock of PSO that are subject to mandatory redemption or
sinking fund requirements, PROVIDED that the aggregate stated value of all such
series outstanding at the time of any such payment does not exceed five percent
of the aggregate of (1) the total principal amount of all bonds or other
securities representing secured indebtedness issued or assumed by PSO and then
outstanding and (2) the capital and surplus of PSO to be stated on the books of
account of PSO after giving effect to such payment, PROVIDED, HOWEVER, that any
moneys deposited in any sinking fund and not in violation of this provision may
thereafter be applied to the purchase or redemption of such Preferred Stock in
accordance with the terms of such sinking fund without regard to the
restrictions contained in this provision, and (d) payments under any guarantee
by PSO with respect to any securities of a subsidiary of PSO, provided that the
proceeds from the issuance of such securities were used to purchase Junior
Subordinated Debentures of any series under the Indenture) if at such time (i)
there shall have occurred any event of which PSO has actual knowledge that (a)
with the giving of notice or the lapse of time, or both, would constitute a
"Debenture Event of Default" under the Indenture with respect to Corresponding
Junior Subordinated Debentures of such series and (b) in respect of which PSO
shall not have taken reasonable steps to cure, (ii) PSO shall be in default with
respect to its payment of any obligations under the related Guarantee or (iii)
PSO shall have given notice of its selection of an Extension Period as provided
in the Indenture with respect to Corresponding Junior Subordinated Debentures of
such series and shall not have rescinded such notice, or such Extension Period,
or any extension thereof, shall be continuing.

         PSO will also covenant, as to each series of Corresponding Junior
Subordinated Debentures, (i) to maintain directly or indirectly 100% ownership
of the Common Securities of the Issuer Trust to which Corresponding Junior
Subordinated Debentures have been issued, provided that certain successors which
are permitted pursuant to the Indenture may succeed to PSO's ownership of the
Common Securities, (ii) not to voluntarily terminate, wind-up or liquidate any
Issuer Trust, except (a) in connection with a distribution of Corresponding
Junior Subordinated Debentures to the holders of the Preferred Securities and
Common Securities in liquidation of such Issuer Trust or (b) in connection with
certain mergers, consolidations or amalgamations permitted by the related Trust
Agreement and (iii) to use its reasonable efforts, consistent with the terms and
provisions of the related Trust Agreement, to cause such Issuer Trust to remain
classified as a "grantor trust" and not to be classified as an association
taxable as a corporation for United States federal income tax purposes. PSO will
also make certain additional agreements relating to the Indenture as provided in
the last sentence of the first paragraph under "Description of Junior
Subordinated Debentures--Modification of Indenture."



                  RELATIONSHIP AMONG THE PREFERRED SECURITIES,
                THE CORRESPONDING JUNIOR SUBORDINATED DEBENTURES
                               AND THE GUARANTEES

         As long as payments of interest and other payments are made when due on
each series of Corresponding Junior Subordinated Debentures, such payments will
be sufficient to cover Distributions and other payments due on the related
Preferred Securities, primarily because (i) the aggregate principal amount of
each series of Corresponding Junior Subordinated Debentures will be equal to the
sum of the aggregate Liquidation Amount of the related Preferred Securities and
related Common Securities; (ii) the interest rate and interest and other payment
dates on each series of Corresponding Junior Subordinated Debentures will match
the Distribution rate and Distribution and other payment dates for the related
Preferred Securities; (iii) PSO shall pay for all and any costs, expenses and
liabilities of such Issuer Trust except the Issuer Trust's obligations to
holders of its Preferred Securities under such Preferred Securities; and (iv)
each Trust Agreement further provides that the Issuer Trust will not engage in
any activity that is not consistent with the limited purposes of such Issuer
Trust.

         Payments of Distributions and other amounts due on the Preferred
Securities (to the extent the Issuer Trust has funds available for the payment
of such Distributions) are irrevocably guaranteed by PSO as and to the extent
set forth under "Description of Guarantees." Taken together, PSO's obligations
under each series of Corresponding Junior Subordinated Debentures, the
Indenture, the related Trust Agreement, the related Expense Agreement, and the
related Guarantee provide a full, irrevocable and unconditional guarantee of
payments of distributions and other amounts due on the related series of
Preferred Securities. No single document standing alone or operating in
conjunction with fewer than all of the other documents constitutes such
guarantee. It is only the combined operation of these documents that has the
effect of providing a full, irrevocable and unconditional guarantee of the
Issuer Trust's obligations under the Preferred Securities. If and to the extent
that PSO does not make payments on any series of Corresponding Junior
Subordinated Debentures, such Issuer Trust will not pay Distributions or other
amounts due on related Preferred Securities. The Guarantees do not cover payment
of Distributions when the related Issuer Trust does not have sufficient funds to
pay such Distributions. In such event, the remedies of a holder of a series of
Preferred Securities are as described above under "Description of Junior
Subordinated Debentures--Debenture Events of Default," "Description of Preferred
Securities--Events of Default; Notice" and "--Enforcement of Certain Rights by
Holders of Preferred Securities." The obligations of PSO under each Guarantee
are subordinate and junior in right of payment to all Senior Indebtedness of
PSO.

         Notwithstanding anything to the contrary in the Indenture, PSO has the
right to set off any payment it is otherwise required to make thereunder with
and to the extent PSO has theretofore made, or is concurrently on the date of
such payment making, a payment under the related Guarantee.

         A holder of any related Preferred Security may institute a legal
proceeding directly against PSO to enforce its rights under the related
Guarantee without first instituting a legal proceeding against the Guarantee
Trustee, the related Issuer Trust or any other person or entity.

         Each Issuer Trust's Preferred Securities evidence a beneficial interest
in such Issuer Trust, and each Issuer Trust exists for the sole purpose of
issuing its Preferred Securities and Common Securities and investing the
proceeds thereof in Corresponding Junior Subordinated Debentures. A principal
difference between the rights of a holder of a Preferred Security and the rights
of a holder of a Corresponding Junior Subordinated Debenture is that a holder of
a Corresponding Junior Subordinated Debenture is entitled to receive from PSO
the principal amount of and interest accrued on Corresponding Junior
Subordinated Debentures held, while a holder of Preferred Securities is entitled
to receive Distributions from such Issuer Trust (or from PSO under the
applicable Guarantee) if and to the extent such Issuer Trust has funds available
for the payment of such Distributions.

         Upon any voluntary or involuntary termination, winding-up or
liquidation of any Issuer Trust involving the liquidation of the Corresponding
Junior Subordinated Debentures, the holders of the related Preferred Securities
will be entitled to receive, out of assets held by such Issuer Trust and after
satisfaction of liabilities to creditors of such Issuer Trust as provided by
applicable law, the Liquidation Distribution in cash. See "Description of
Preferred Securities--Liquidation Distribution Upon Termination." Upon any
voluntary or involuntary liquidation or bankruptcy of PSO, the Property Trustee,
as holder of the Corresponding Junior Subordinated Debentures, would be a
subordinated creditor of PSO, subordinated in right of payment to all Senior
Indebtedness, but entitled to receive payment in full of principal and interest,
before any shareholders of PSO receive payments or distributions. Since PSO is
the guarantor under each Guarantee and has agreed to pay for all costs, expenses
and liabilities of each Issuer Trust (other than the Issuer Trust's obligations
to the holders of its Preferred Securities), the positions of a holder of such
Preferred Securities and a holder of such Corresponding Junior Subordinated
Debentures relative to other creditors and to shareholders of PSO in the event
of liquidation or bankruptcy of PSO would be substantially the same.

         A default or event of default under any Senior Indebtedness of PSO will
not constitute a default or Event of Default under the Indenture. However, in
the event of payment defaults under, or acceleration of, Senior Indebtedness of
PSO, the subordination provisions of the Indenture provide that no payments may
be made in respect of the Corresponding Junior Subordinated Debentures until
such Senior Indebtedness has been paid in full or any payment default thereunder
has been cured or waived. Failure to make required payments on any series of
Corresponding Junior Subordinated Debentures would constitute a Debenture Event
of Default under the Indenture with respect to such series.

                              PLAN OF DISTRIBUTION

         PSO may sell any series of the Junior Subordinated Debentures, and each
Issuer Trust may sell any series of Preferred Securities, through underwriters,
dealers or agents, or directly to one or more purchasers. The Prospectus
Supplement with respect to the securities offered thereby will set forth the
terms of the offering of such Offered Securities, including the name or names of
any underwriters, dealers or agents, the purchase price of such Offered
Securities and the proceeds to PSO or the Issuer Trust, as the case may be, from
such sale, any underwriting discounts and other items constituting underwriters'
or agents' compensation, any initial public offering price and any discounts or
concessions allowed or reallowed or paid to dealers.

         If underwriters are involved in the sale of any Offered Securities,
such Offered Securities will be acquired by the underwriters for their own
account and may be resold from time to time in one or more transactions,
including negotiated transactions, at a fixed public offering price or at
varying prices determined at the time of sale. The underwriter or underwriters
with respect to a particular underwritten offering of Offered Securities will be
named in the Prospectus Supplement relating to such offering and, if an
underwriting syndicate is used, the managing underwriter or underwriters will be
set forth on the cover page of such Prospectus Supplement. Unless otherwise set
forth in such Prospectus Supplement, the obligations of the underwriters to
purchase the Offered Securities will be subject to certain conditions precedent,
and the underwriters will be obligated to purchase all such Offered Securities
if any are purchased.

         If a dealer is used in the sale of any Offered Securities, PSO will
sell such Offered Securities to the dealer, as principal. The dealer may then
resell such Offered Securities to the public at varying prices to be determined
by such dealer at the time of resale. The name of any dealer involved in a
particular offering of Offered Securities and any discounts or concessions
allowed or reallowed or paid to the dealer will be set forth in the Prospectus
Supplement relating to such offering.

         The Offered Securities may be sold directly by PSO or through agents
designated by PSO from time to time. Any such agent, who may be deemed to be an
underwriter as that term is defined in the Securities Act, involved in the offer
or sale of any of the Offered Securities will be named, and any commissions
payable by PSO to such agent will be set forth, in the Prospectus Supplement
relating to such offer or sale. Unless otherwise indicated in such Prospectus
Supplement, any such agent will be acting on a reasonable best efforts basis for
the period of its appointment.

         Certain of the underwriters, dealers or agents and their associates may
be customers of, engage in the transactions with or perform services for PSO
and/or the applicable Issuer Trust and/or any of their respective affiliates in
the ordinary course of business.

         PSO will indicate in a Prospectus Supplement the extent to which it
anticipates that a secondary market for the Offered Securities will be
available.

         Underwriters, dealers and agents participating in the distribution of
the Offered Securities may be deemed to be "underwriters" within the meaning of,
and any discounts and commissions received by them and any profit realized by
them on resale of such Offered Securities may be deemed to be underwriting
discounts and commissions under, the Securities Act. Subject to certain
conditions, PSO and the applicable Issuer Trustee may agree to indemnify the
several underwriters, dealers or agents and their controlling persons against
certain civil liabilities, including certain liabilities under the Securities
Act, or to contribute to payments any such person may be required to make in
respect thereof.

                                 LEGAL OPINIONS

         Unless otherwise indicated in the applicable Prospectus Supplement,
certain legal matters in connection with the Offered Securities, including the
validity of the Junior Subordinated Debentures, the Indenture and the
Guarantees, will be passed upon for PSO and each Issuer Trust by Milbank, Tweed,
Hadley & McCloy, New York, New York, and for the underwriters by Sidley &
Austin, Chicago, Illinois. Sidley & Austin has from time to time represented CSW
and certain of its affiliates, including PSO, in connection with certain
matters. All matters of Oklahoma law will be passed upon by Doerner, Saunders,
Daniel & Anderson, Tulsa, Oklahoma. Certain matters of Delaware law relating to
the validity of the Preferred Securities, the enforceability of each Trust
Agreement and the creation of each Issuer Trust will be passed upon by Richards,
Layton & Finger, P.A., as special Delaware counsel to PSO and the Issuer Trusts.
Certain tax matters in connection with the Preferred Securities will be passed
upon for PSO and each Issuer Trust by Christy & Viener, New York, New York.

                                     EXPERTS

         The financial statements and schedules incorporated in this Prospectus
by reference from PSO's Annual Report on Form 10-K have been audited by Arthur
Andersen LLP, independent public accountants, as stated in their reports, which
are incorporated herein by reference and have been so incorporated herein in
reliance upon the authority of such firm as experts in accounting and auditing
in giving such reports.


  NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR THE
PROSPECTUS, AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT
BE RELIED UPON AS HAVING BEEN AUTHORIZED. THIS PROSPECTUS SUPPLEMENT AND THE
PROSPECTUS DO NOT CONSTITUTE AN OFFER TO SELL OR THE SOLICITATION OF AN OFFER TO
BUY ANY SECURITIES OTHER THAN THE SECURITIES DESCRIBED IN THIS PROSPECTUS
SUPPLEMENT AND THE PROSPECTUS OR ANY OFFER TO SELL OR THE SOLICITATION OF AN
OFFER TO BUY SUCH SECURITIES IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS SUPPLEMENT AND
THE PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL, UNDER ANY CIRCUMSTANCES,
CREATE ANY IMPLICATION THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF PSO SINCE
THE DATE HEREOF OR THAT THE INFORMATION CONTAINED HEREIN OR THEREIN IS CORRECT
AS OF ANY TIME SUBSEQUENT TO ITS DATE.


                         3,000,000 PREFERRED SECURITIES

                                  PSO CAPITAL I

                               % TRUST ORIGINATED
                              PREFERRED SECURITIES,
                              SERIES A ("TOPRSSM")
                                TABLE OF CONTENTS

                              PROSPECTUS SUPPLEMENT

                                                               PAGE

Risk Factors...................................................S- 6
PSO Capital I..................................................S- 9
Public Service Company of Oklahoma.............................S-10
Recent Developments............................................S-10
Use of Proceeds................................................S-10
Consolidated Ratios of Earnings to Fixed
  Charges and Earnings to Combined Fixed
  Charges and Preferred Stock Dividend
  Requirements.................................................S-11
Selected Financial Information.................................S-11
Accounting Treatment...........................................S-12
Certain Terms of the Series A Preferred
  Securities...................................................S-12
Certain Terms of the Series A Debentures.......................S-14
ERISA Considerations...........................................S-16
Certain Federal Income Tax Considerations......................S-18
Underwriting...................................................S-21
Legal Opinions.................................................S-22

                             PROSPECTUS

Available Information.........................................    2
Incorporation of Certain Documents by
  Reference...................................................    2
Public Service Company of Oklahoma............................    4
The Issuer Trusts.............................................    4
Use of Proceeds...............................................    5
Consolidated Ratios of Earnings to Fixed
  Charges and Earnings to Combined Fixed Charges
  and Preferred Stock Dividend Requirements...................    5
Description of Junior Subordinated Debentures.................    6
Description of Preferred Securities...........................   18
Description of Guarantees.....................................   34
Description of Corresponding Junior
   Subordinated Debentures....................................   37
Relationship Among the Preferred Securities,
   the Corresponding Junior Subordinated
   Debentures and the Guarantees..............................   39
Plan of Distribution..........................................   40
Legal Opinions................................................   42
Experts.......................................................   42


GUARANTEED, AS DESCRIBED HEREIN, BY


PSO
PUBLIC SERVICE
COMPANY OF OKLAHOMA


                              --------------------
                              PROSPECTUS SUPPLEMENT
                              --------------------




                               MERRILL LYNCH & CO.
                              GOLDMAN, SACHS & CO.
                              MORGAN STANLEY & CO.
                                  INCORPORATED
                                SMITH BARNEY INC.












                                    ___________, 1997





                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.

             Registration fee......................................... $ 22,728
            *Public Utility Holding Company Act filing fee............    2,000
            *Counsel fees..........................................      80,000
            *Accountants' fees....................................        8,000
            *Stock exchange listing fees..........................       36,900
            *Trustee fees..........................................      10,000
            *Rating agency fees...................................       18,000
            *Blue sky expenses.....................................       1,250
            *Printing and delivery of registration statement,
               prospectus, certificates, etc......................       20,000
            *Expenses of Central and South West Services, Inc.........    3,000
            *Miscellaneous expenses...................................    4,689
                                                                          -----

                 Total................................................ $206,567
- - -------------------

* Estimated


ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS.

        Article 1031 of the Oklahoma General Corporation Act provides broadly
for indemnification of directors and officers against claims and liabilities
against them in their capacities as such. PSO's bylaws also provide for the
indemnification of officers and directors by PSO. In addition, PSO has purchased
Directors' and Officers' Liability and Company Reimbursement Liability Insurance
which, in certain circumstances, provide for payments to the directors and
officers of PSO, in the event of such liabilities.

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.

        (a)    Exhibits

               A list of exhibits included as part of this Registration
               Statement is set forth in an Exhibit Index, which immediately
               precedes such exhibits.

        (b)    Financial Statement Schedules

               None.

ITEM 17.  UNDERTAKINGS.

        (a)    Each of the undersigned registrants hereby undertakes:

               (1) To file, during any period in which offers or sales are being
        made, a post-effective amendment to this registration statement:

                       (i)  To include any prospectus required by section 10(a)
              (3)  of the Securities Act of 1933;

                       (ii) To reflect in the prospectus any facts or events
               arising after the effective date of the registration statement
               (or the most recent post-effective amendment thereof) which,
               individually or in the aggregate, represent a fundamental change
               in the information set forth in the registration statement;
               PROVIDED, HOWEVER, that any increase or decrease in volume of
               securities offered (if the total dollar value of securities
               offered would not exceed that which was registered) and any
               deviation from the low or high end of the estimated maximum
               offering range may be reflected in the form of prospectus filed
               with the Commission pursuant to Rule 424(b) if, in the aggregate,
               the changes in volume and price represent no more than a 20%
               change in the maximum aggregate offering price set forth in the
               "Calculation of Registration Fee" table in the effective
               registration statement; and

                       (iii) To include any material information with respect to
               the plan of distribution not previously disclosed in the
               registration statement or any material change to such information
               in the registration statement;

        PROVIDED, HOWEVER, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply
        if the information required to be included in a post-effective amendment
        by those paragraphs is contained in periodic reports filed with or
        furnished to the Commission by the registrant pursuant to section 13 or
        section 15(d) of the Securities Exchange Act of 1934 that are
        incorporated by reference in the registration statement.

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

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

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

               (5) To provide to the underwriters at the closing specified in
        the underwriting agreements certificates in such denominations and
        registered in such names as required by the underwriter to permit prompt
        delivery to each purchaser.

        (b) Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the registrants pursuant to the provisions described under Item 15,
or otherwise, the registrants have been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Securities Act of 1933 and is, therefore, unenforceable. In
the event that a claim for indemnification against such liabilities (other than
the payment by the registrants of expenses incurred or paid by a director,
officer or controlling person of the registrants in the successful defense of
any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the
registrants will, unless in the opinion of their counsel the matter has been
settled by controlling precedent, submit to a court of appropriate jurisdiction
the question whether such indemnification by it is against public policy as
expressed in the Securities Act of 1933 and will be governed by the final
adjudication of such issue.


                                   SIGNATURES

         Pursuant to the  requirements  of the Securities Act of 1933, PSO
certifies  that  it  has  reasonable  grounds  to  believe  that  it  meets  the
requirements  for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Tulsa, State of Oklahoma, on April 2, 1997.

                                      PUBLIC SERVICE COMPANY OF OKLAHOMA


                                      By:    /S/  WENDY G. HARGUS
                                             Wendy G. Hargus
                                             Treasurer


         Pursuant to the  requirements of the Securities Act of 1933, this
Amendment  No.1 to  Registration  Statement  has been  signed  by the  following
persons in the capacities indicated on April 2, 1997.

                        SIGNATURE                           TITLE


/S/                  T.D. CHURCHWELL*   President (principal executive officer);
                     T.D. Churchwell    Director


/S/                  WENDY G. HARGUS*    Treasurer (principal financial officer)
                     Wendy G. Hargus


/S/                 R. RUSSELL DAVIS*    Controller and Chief Accounting Officer
                    R. Russell Davis    (principal accounting officer)


                                        Director
                       E.R. Brooks


/S/                    GLENN FILES*      Director
                       Glenn Files




<PAGE>


/S/                  DR. ROBERT B. TAYLOR, JR.*               Director
                     Dr. Robert B. Taylor, Jr.


/S/                WILLIAM R. MCKAMEY*                       Director
                   William R. McKamey


                                    Director
                   Paula Marshall-Chapman


/S/                PAUL K. LACKEY, JR*.                      Director
                   Paul K. Lackey, Jr.


/S/                  HARRY A. CLARK*                         Director
                     Harry A. Clark



*By:  /s/  Wendy G. Hargus
         Wendy G. Hargus
         Attorney-in-Fact





                                SIGNATURES

               Pursuant to the  requirements  of the Securities Act of 1933, PSO
Capital I certifies that it has reasonable  grounds to believe that it meets the
requirements  for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Dallas, State of Texas, on April 2, 1997.

                                             PSO CAPITAL I


                                             By:  /S/  WENDY G. HARGUS
                                                       Wendy G. Hargus, as
                                                       Administrative Trustee


                                 SIGNATURES

               Pursuant to the  requirements  of the Securities Act of 1933, PSO
Capital II certifies that it has reasonable grounds to believe that it meets the
requirements  for filing on Form S-3 and has duly caused this Amendment No. 1 to
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Dallas, State of Texas, on April 2, 1997.

                                             PSO CAPITAL II



                                             By: /S/ WENDY G. HARGUS
                                                     Wendy G. Hargus, as
                                                     Administrative Trustee




                                      EXHIBIT INDEX

   Exhibit
     NO.                      DESCRIPTION


 1(a)   Form of Underwriting Agreement relating to Junior Subordinated
        Debentures not issued in connection with Preferred Securities
         (previously filed).

  1(b)  Form of Underwriting Agreement to be used in connection with the
        issuance of Preferred Securities (previously filed).

  4(a)  Form of Indenture between PSO and The Bank of New York, as Trustee, to
        be used in connection with the issuance of the Junior Subordinated
        Debentures and Corresponding Junior Subordinated Debentures (previously
        filed).

  4(b)  Form of Supplemental Indenture to Indenture to be used in connection
        with the issuance of Junior Subordinated Debentures (other than
        Corresponding Junior Subordinated Debentures) (previously filed).

  4(c)  Form of Supplemental Indenture to Indenture to be used in connection
        with the issuance of Corresponding Junior Subordinated Debentures and
        Preferred Securities (previously filed).

  4(d)  Form of Junior Subordinated Debenture (included in Exhibit 4(c) above).

  4(e)  Certificate of Trust of PSO Capital I (Certificate for PSO Capital II
        will be substantially identical except for names and dates) (previously
        filed).

  4(f)  Trust Agreement of PSO Capital I (Trust Agreement for PSO Capital II
        will be substantially identical except for names and dates) (previously
        filed).

  4(g)  Form of Amended and Restated Trust Agreement (Agreements for PSO Capital
        I and PSO Capital II are substantially identical except for names and
        dates) (previously filed).

  4(h)  Form of Preferred Security  Certificate for PSO Capital I and PSO
        Capital II. (included in Exhibit 4(g) above).

  4(i)  Form of Guarantee Agreement (Agreements for PSO Capital I and PSO
        Capital II are substantially identical except for names and dates) (
        previously filed).

  5(a)  Opinion of Milbank, Tweed, Hadley & McCloy with respect to the Junior
        Subordinated Debentures and Guarantees.
 
  5(b)  Opinion of Richards, Layton & Finger, special Delaware counsel, with
        respect to the Preferred Securities of PSO Capital I.
 
  5(c)  Opinion of Richards, Layton & Finger, special Delaware counsel, with
        respect to the Preferred Securities of PSO Capital II. 

  5(d)  Opinion of Doerner, Saunders, Daniel & Anderson, with respect to the
        Junior Subordinated Debentures and Guarantees.
 
  8     Opinion of Christy & Viener with respect to United States Federal Income
        Tax Matters.

*12(a)  Statements re Computation of Ratios of Earnings to Fixed Charges
        (Exhibit 12.2, Form 10-K for the Year ended December 31, 1996).

12(b)   Statements re Computation of Ratios of Earnings to Combined Fixed
        Charges and Preferred Stock Dividend Requirements.

23(a)   Consent of Arthur Andersen LLP.

 23(b)  Consent of Milbank, Tweed, Hadley & McCloy (included in Exhibit 5(a)
        above).

 23(c) Consents of Richards, Layton & Finger (included in Exhibits 5(b) and 5(c)
       above).

 23(d)  Consent of Christy & Viener (included in Exhibit 8 above).

 23(e) Consent of Doerner, Saunders, Daniel & Anderson (included in Exhibit 5(d)
       above).

 24    Powers of Attorney (included on page II-3 of Registration Statement)
       (previously filed).

 25(a) Statement of Eligibility under the Trust Indenture Act of 1939, as
       amended, of The Bank of New York, as Trustee under the Indenture between
       PSO and The Bank of New York.

 25(b)  Statement of Eligibility under the Trust Indenture Act of 1939 of The
        Bank of New York, as Guarantee Trustee for the Guarantee for PSO Capital
        I.

 25(c)  Statement of Eligibility under the Trust Indenture Act of 1939 of The
        Bank of New York, as Property Trustee for the Amended and Restated Trust
        Agreement of PSO Capital I.

 25(d)  Statement of Eligibility under the Trust Indenture Act of 1939 of The
        Bank of New York, as Guarantee Trustee for the Guarantee for PSO Capital
        II.

 25(e)  Statement of Eligibility under the Trust Indenture Act of 1939 of The
        Bank of New York, as Property Trustee for the Amended and Restated Trust
        Agreement of PSO Capital II.
- - ------------------
*  Incorporated by reference.





                                                                    Exhibit 5(a)


                         Milbank, Tweed, Hadley & McCloy
                             1 Chase Manhattan Plaza
                            New York, New York 10005


                                   April 2, 1997


Public Service Company of Oklahoma
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

PSO Capital I
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

PSO Capital II
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

          Re:  Amendment No. 1 to Registration Statement on Form S-3 of
               Public Service Company of Oklahoma

Ladies and Gentlemen:

          We are acting as special  counsel  to Public  Service  Company of
Oklahoma,  an Oklahoma  corporation  (the  "Company"),  in  connection  with the
proposed issuance and sale by the Company from time to time of up to $75 million
aggregate principal amount of the Company's Junior Subordinated  Debentures (the
"Debentures"),  to be  issued in one or more  series  pursuant  to an  indenture
between the Company and The Bank of New York, as Trustee (the "Indenture"),  and
the  proposed  public  offering  by PSO  Capital I and PSO  Capital  II,  each a
business  trust created  under the laws of the State of Delaware  (collectively,
the "Issuer Trusts"),  from time to time in one or more series, of an amount not
to exceed $75 million of preferred securities,  representing preferred undivided
beneficial  interests  in the  assets  of such  Issuer  Trusts  (the  "Preferred
Securities"),  all as  contemplated by the  Registration  Statement on Form S-3,
including Amendment No. 1 thereto (the "Registration  Statement"),  filed by the
Company and the Issuer Trusts with the Securities and Exchange  Commission  (the
"Commission")  for the  registration of the Debentures and Preferred  Securities
under the Securities Act of 1933, as amended (the "Act") and their sale pursuant
to one or more  underwriting  agreements filed as an exhibit to the Registration
Statement (each, an "Underwriting Agreement"). Capitalized terms used herein and
not  otherwise  defined have the meanings  ascribed to them in the  Registration
Statement.

          As described in the Registration Statement, the Company may issue the
Debentures to (a) the public or institutional investors or (b) the Issuer Trusts
in connection with the issuance of Preferred Securities. If Preferred Securities
are issued by the Issuer Trusts, the proceeds therefrom, together with the
capital contribution of the Company, as owner of the common securities of each
Issuer Trust, will be used to purchase Debentures. The Company will guarantee
pursuant to a Guarantee Agreement between the Company and The Bank of New York,
as trustee, the payment by each Issuer Trust of distributions that are required
to be made from time to time with respect to the Preferred Securities and of
amounts due upon liquidation of each Issuer Trust or the redemption of the
Preferred Securities (the "Guarantee," or when referred to collectively, the
"Guarantees"), all to the extent such Issuer Trust has funds available therefor
as set forth in the Guarantees. The Preferred Securities are to be issued by
each Issuer Trust pursuant to a Trust Agreement, each as amended and restated.

          We have examined originals, or copies certified to our satisfaction,
of such corporate records of the Company and the Issuer Trusts, certificates of
public officials, certificates of officers and representatives of the Company
and the Issuer Trusts and other documents, as we have deemed it necessary to
require as a basis for the opinions hereinafter expressed. In our examination we
have assumed the genuineness of all signatures and the authenticity of all
documents submitted to us as originals and the conformity with the originals of
all documents submitted to us as copies. As to various questions of fact
material to such opinions we have, when relevant facts were not independently
established, relied upon certifications by officers of the Company and other
appropriate persons and statements contained in the Registration Statement.

          Based on the foregoing, and having regard to legal considerations we
deem relevant, we are of the opinion that when the Indenture has been duly
authorized, executed and delivered by the Company and duly executed and
delivered by The Bank of New York, as Trustee, when the supplemental indenture
with respect to a series of Debentures has been duly authorized, executed and
delivered, when the Guarantee Agreement relating to the Guarantee with respect
to a series of Preferred Securities has been duly authorized, executed and
delivered, when the Amended and Restated Trust Agreement of the Issuer Trust
issuing the Preferred Securities has been duly authorized, executed and
delivered, and when the Debentures and Preferred Securities of such series have
been duly authorized, executed, and, in the case of the Debentures,
authenticated, and issued in accordance with the terms of the Indenture and the
applicable supplemental indenture and delivered against payment therefor in
accordance with the terms of the applicable Underwriting Agreement, the
Debentures of such series and the Guarantee relating to such series of Preferred
Securities of such Issuer Trust, will constitute legal, valid and binding
obligations of the Company, entitled to the benefits of, and subject to the
provisions of, the Indenture and the applicable supplemental indenture, and the
Guarantee Agreement, except (i) as enforcement thereof may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws of general
applicability affecting the enforcement of creditors' rights and (ii) that such
enforceability may be limited by the application of general principals of equity
(regardless of whether considered in a proceeding in equity or at law),
including without limitation (x) the possible unavailability of specific
performance, injunctive relief or any other equitable remedies and (y) concepts
of materiality, reasonableness, good faith and fair dealing.

          We do not express any opinion as to matters governed by any laws other
than the Federal laws of the United States and the laws of the State of New
York, and we are expressing no opinion as to the effects of the laws of any
other jurisdiction.

          We hereby consent to the use of this opinion as Exhibit 5(a) to the
Registration Statement and further consent to the use of our name in the
Registration Statement, and any amendment thereto, and in the preliminary
Prospectus and the preliminary Prospectus Supplement constituting a part
thereof.

                              Very truly yours,

                              /s/ MILBANK, TWEED, HADLEY & McCLOY









                                                                    Exhibit 5(b)

                            RICHARDS, LAYTON & FINGER









                             April  2, 1997







PSO Capital One
c/o Public Service Company of Oklahoma
Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas 75202

            Re:   PSO CAPITAL I

Ladies and Gentlemen:

            We have acted as special Delaware counsel for Public Service Company
of Oklahoma, an Oklahoma corporation (the "Company"), and PSO Capital I, a
Delaware business trust (the "Trust" ), in connection with the matters set forth
herein. At your request, this opinion is being furnished to you.

            For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:

            (a) The Certificate of Trust of the Trust, dated January 29, 1997 as
filed with the office of the Secretary of State of the State of Delaware (the
"Secretary of State") on January 29, 1997;

            (b) The Trust Agreement of the Trust, dated as of January 29, 1997
between the Company and the trustees of the Trust named therein;

            (c) The Registration Statement on Form S-3, as amended by
Amendment No. 1 to the Registration Statement (collectively, the "Registration
 Statement"), including a prospectus and prospectus supplement with respect to
the Trust (collectively, the "Prospectus"), relating to the Trust Originated
Preferred Securities of the Trust representing preferred undivided beneficial
interests in the assets of the Trust (each, a "Security" and collectively, the
"Securities"), filed by the Company and the Trust with the Securities and
Exchange Commission on or about April 2, 1997;

            (d) A form of Amended and Restated Trust Agreement for the Trust, to
be entered into between the Company, the trustees of the Trust named therein,
and the holders, from time to time, of the undivided beneficial interests in the
assets of the Trust (including Exhibits C and E thereto) (the "Trust
Agreement"), attached as an exhibit to the Registration Statement; and

            (e) A Certificate of Good Standing for the Trust, dated February 4,
1997, obtained from the Secretary of State.

            Initially capitalized terms used herein and not otherwise defined
are used as defined in the Trust Agreement.

            For purposes of this opinion, we have not reviewed any documents
other than the documents listed in paragraphs (a) through (e) above. In
particular, we have not reviewed any document (other than the documents listed
in paragraphs (a) through (e) above) that is referred to in or incorporated by
reference into the documents reviewed by us. We have assumed that there exists
no provision in any document that we have not reviewed that is inconsistent with
the opinions stated herein. We have conducted no independent factual
investigation of our own but rather have relied solely upon the foregoing
documents, the statements and information set forth therein and the additional
matters recited or assumed herein, all of which we have assumed to be true,
complete and accurate in all material respects.

            With respect to all documents examined by us, we have assumed (i)
the authenticity of all documents submitted to us as authentic originals, (ii)
the conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

            For purposes of this opinion, we have assumed (i) that the Trust
Agreement and the Certificate of Trust are in full force and effect and have not
been amended, (ii) except to the extent provided in paragraph 1 below, the due
organization or due formation, as the case may be, and valid existence in good
standing of each party to the documents examined by us under the laws of the
jurisdiction governing its creation, organization or formation, (iii) the legal
capacity of natural persons who are parties to the documents examined by us,
(iv) that each of the parties to the documents examined by us has the power and
authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Security is to be issued by the Trust (collectively, the "Security Holders")
of a certificate for such Security in the form prescribed by the Trust Agreement
and the payment for such Security, in accordance with the Trust Agreement and
the Registration Statement, and (vii) that the Securities are issued and sold to
the Security Holders in accordance with the Trust Agreement and the Registration
Statement. We have not participated in the preparation of the Registration
Statement and assume no responsibility for its contents.

            This opinion is limited to the laws of the State of Delaware
(excluding the securities laws of the State of Delaware), and we have not
considered and express no opinion on the laws of any other jurisdiction,
including federal laws and rules and regulations relating thereto. Our opinions
are rendered only with respect to Delaware laws and rules, regulations and
orders thereunder which are currently in effect.

            Based upon the foregoing, and upon our examination of such questions
of law and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

            1. The Trust has been duly created and is validly existing in good
standing as a business trust under the Delaware Business Trust Act.

            2. The Securities of the Trust will represent valid and, subject to
the qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

            3. The Security Holders, as beneficial owners of the Trust, will be
entitled to the same limitation of personal liability extended to stockholders
of private corporations for profit organized under the General Corporation Law
of the State of Delaware. We note that the Security Holders may be obligated to
make payments as set forth in the Trust Agreement.

          We consent to the filing of this opinion with the  Securities and
Exchange  Commission  as an exhibit  to the  Registration  Statement.  We hereby
consent  to the use of our  name  under  the  heading  "Legal  Opinions"  in the
Prospectus.  In giving the foregoing  consents,  we do not thereby admit that we
come within the category of persons whose consent is required under Section 7 of
the  Securities  Act of 1933, as amended,  or the rules and  regulations  of the
Securities and Exchange Commission  thereunder.  Except as stated above, without
our prior  written  consent,  this opinion may not be furnished or quoted to, or
relied upon by, any other person for any purpose.

                                    Very truly yours,

                                    /s/ Richards, Layton & Finger




                                                                    Exhibit 5(c)

                            RICHARDS, LAYTON & FINGER









                             April 2, 1997







PSO Capital One
c/o Public Service Company of Oklahoma
Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas 75202

            Re:   PSO CAPITAL II

Ladies and Gentlemen:

            We have acted as special Delaware counsel for Public Service Company
of Oklahoma, an Oklahoma corporation (the "Company"), and PSO Capital II, a
Delaware business trust (the "Trust" ), in connection with the matters set forth
herein. At your request, this opinion is being furnished to you.

            For purposes of giving the opinions hereinafter set forth, our
examination of documents has been limited to the examination of originals or
copies of the following:

            (a) The Certificate of Trust of the Trust, dated January 29, 1997 as
filed with the office of the Secretary of State of the State of Delaware (the
"Secretary of State") on January 29, 1997;

            (b) The Trust Agreement of the Trust, dated as of January 29, 1997
between the Company and the trustees of the Trust named therein;

            (c) The Registration Statement on Form S-3, as amended by the
Amendment No. 1 the Registration Statement (collectively, the "Registration
Statement") on Form S-3, including a prospectus and prospectus supplement with
respect to the Trust (collectively, the "Prospectus"), relating to the Trust
Originated Preferred Securities of the Trust representing preferred undivided
beneficial interests in the assets of the Trust (each, a "Security" and
collectively, the "Securities"), filed by the Company and the Trust with the
Securities and Exchange Commission on or about April 2, 1997;

            (d) A form of Amended and Restated Trust Agreement for the Trust, to
be entered into between the Company, the trustees of the Trust named therein,
and the holders, from time to time, of the undivided beneficial interests in the
assets of the Trust (including Exhibits C and E thereto) (the "Trust
Agreement"), attached as an exhibit to the Registration Statement; and

            (e) A Certificate of Good Standing for the Trust, dated February 4,
1997, obtained from the Secretary of State.

            Initially capitalized terms used herein and not otherwise defined
are used as defined in the Trust Agreement.

            For purposes of this opinion, we have not reviewed any documents
other than the documents listed in paragraphs (a) through (e) above. In
particular, we have not reviewed any document (other than the documents listed
in paragraphs (a) through (e) above) that is referred to in or incorporated by
reference into the documents reviewed by us. We have assumed that there exists
no provision in any document that we have not reviewed that is inconsistent with
the opinions stated herein. We have conducted no independent factual
investigation of our own but rather have relied solely upon the foregoing
documents, the statements and information set forth therein and the additional
matters recited or assumed herein, all of which we have assumed to be true,
complete and accurate in all material respects.

            With respect to all documents examined by us, we have assumed (i)
the authenticity of all documents submitted to us as authentic originals, (ii)
the conformity with the originals of all documents submitted to us as copies or
forms, and (iii) the genuineness of all signatures.

            For purposes of this opinion, we have assumed (i) that the Trust
Agreement and the Certificate of Trust are in full force and effect and have not
been amended, (ii) except to the extent provided in paragraph 1 below, the due
organization or due formation, as the case may be, and valid existence in good
standing of each party to the documents examined by us under the laws of the
jurisdiction governing its creation, organization or formation, (iii) the legal
capacity of natural persons who are parties to the documents examined by us,
(iv) that each of the parties to the documents examined by us has the power and
authority to execute and deliver, and to perform its obligations under, such
documents, (v) the due authorization, execution and delivery by all parties
thereto of all documents examined by us, (vi) the receipt by each Person to whom
a Security is to be issued by the Trust (collectively, the "Security Holders")
of a certificate for such Security in the form prescribed by the Trust Agreement
and the payment for such Security, in accordance with the Trust Agreement and
the Registration Statement, and (vii) that the Securities are issued and sold to
the Security Holders in accordance with the Trust Agreement and the Registration
Statement. We have not participated in the preparation of the Registration
Statement and assume no responsibility for its contents.

            This opinion is limited to the laws of the State of Delaware
(excluding the securities laws of the State of Delaware), and we have not
considered and express no opinion on the laws of any other jurisdiction,
including federal laws and rules and regulations relating thereto. Our opinions
are rendered only with respect to Delaware laws and rules, regulations and
orders thereunder which are currently in effect.

            Based upon the foregoing, and upon our examination of such questions
of law and statutes of the State of Delaware as we have considered necessary or
appropriate, and subject to the assumptions, qualifications, limitations and
exceptions set forth herein, we are of the opinion that:

            1. The Trust has been duly created and is validly existing in good
standing as a business trust under the Delaware Business Trust Act.

            2. The Securities of the Trust will represent valid and, subject to
the qualifications set forth in paragraph 3 below, fully paid and nonassessable
undivided beneficial interests in the assets of the Trust.

            3. The Security Holders, as beneficial owners of the Trust, will be
entitled to the same limitation of personal liability extended to stockholders
of private corporations for profit organized under the General Corporation Law
of the State of Delaware. We note that the Security Holders may be obligated to
make payments as set forth in the Trust Agreement.

             We consent to the filing of this opinion with the  Securities and
Exchange  Commission  as an exhibit  to the  Registration  Statement.  We hereby
consent  to the use of our  name  under  the  heading  "Legal  Opinions"  in the
Prospectus.  In giving the foregoing  consents,  we do not thereby admit that we
come within the category of persons whose consent is required under Section 7 of
the  Securities  Act of 1933, as amended,  or the rules and  regulations  of the
Securities and Exchange Commission  thereunder.  Except as stated above, without
our prior  written  consent,  this opinion may not be furnished or quoted to, or
relied upon by, any other person for any purpose.

                                    Very truly yours,

                                    /s/ Richards, Layton & Finger




                                                                    EXHIBIT 5(d)

           FORM OF DOERNER, SAUNDERS, DANIEL & ANDERSON
                                 OPINION LETTER



                                   April  2, 1997



Public Service Company of Oklahoma
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

PSO Capital I
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

PSO Capital II
c/o Central and South West Corporation
1616 Woodall Rodgers Freeway
Dallas, Texas  75202

     Re:  Registration  Statement  on Form S-3 of Public  Service
          Company of Oklahoma

Ladies and Gentlemen:

     We are acting as special Oklahoma counsel to Public Service Company of
Oklahoma, an Oklahoma corporation (the "Company"), in connection with the
proposed public offering by the Company from time to time of up to $75 million
aggregate principal amount of the Company's Junior Subordinated Debentures (the
"Debentures") to be issued in one or more series pursuant to an indenture
between the Company and The Bank of New York, as Trustee (the "Indenture"), and
the proposed issuance and sale by PSO Capital I and PSO Capital II, each a
business trust created under the laws of the State of Delaware (collectively,
the "Issuer Trusts"), from time to time in one or more series, not to exceed $75
million, of their preferred securities, representing preferred undivided
beneficial interests in the assets of such Issuer Trusts (the "Preferred
Securities"), all as contemplated by the Registration Statement on Form S-3
filed by the Company and the Issuer Trusts with the Securities and Exchange
Commission (the "Commission") on February 5, 1997, as amended by Amendment No. 1
filed with the Commission on March , 1997, (the"Registration Statement") for the
registration of the Debentures and Preferred Securities under the Securities Act
of 1933, as amended (the "Act"), and their sale pursuant to one or more
underwriting agreements filed as an exhibit to the Registration Statement (each,
an "Underwriting Agreement").

     As described in the Registration Statement, the Company may issue the
Debentures to (a) the public or institutional investors or (b) the Issuer Trusts
in connection with the issuance of Preferred Securities. If Preferred Securities
are issued by the Issuer Trusts, the proceeds therefrom, together with the
capital contribution of the Company, as owner of the common securities of each
Issuer Trust, will be used to purchase Debentures. The Company will guarantee
pursuant to a Guarantee Agreement the payment by each Issuer Trust of
distributions with respect to the Preferred Securities and of amounts due upon
liquidation of each Issuer Trust or redemption of the Preferred Securities
(collectively, the "Guarantees"), all to the extent such Issuer Trust has funds
available therefor as set forth in the Guarantees. The Preferred Securities are
to be issued by each Issuer Trust pursuant to a Trust Agreement, each as amended
and restated.

     We have examined originals, or copies certified to our satisfaction, or
such corporate records of the Company and the Issuer Trusts, certificates of
public officials, certificates of officers and representatives of the Company
and the Issuer Trusts and other documents as we have deemed necessary as a basis
for the opinions hereinafter expressed. In our examination we have assumed the
genuineness of all signatures and the authenticity of all documents submitted to
us as originals and the conformity with the originals of all documents submitted
to us as copies. As to various questions of fact material to such opinions we
have, when relevant facts were not independently established, relied upon
certifications by officers of the Company and other appropriate persons and
statements contained in the Registration Statement.

     Based on the foregoing, and having regard to legal considerations we deem
relevant, we are of the opinion that:

     1. All requisite action necessary for the due execution and delivery of the
Guarantees will have been taken when the Board of Directors of the Company, or a
committee or officer duly authorized thereby, shall have taken such action as
may be necessary to fix and determine the terms of the Guarantees and the
Guarantees shall have been duly executed and delivered.

     2. All requisite action necessary for the due execution and delivery of the
Debentures will have been taken when the Board of Directors of the Company, or a
committee or officer duly authorized thereby, shall have taken such action as
may be necessary to fix and determine the terms of the Debentures, the Indenture
shall have been executed and delivered, and the Debentures shall have been
issued and delivered in exchange for the proceeds from the Preferred Securities
and the capital contribution of the Company.

     The opinions expressed above are limited to the laws of the State of
Oklahoma.

     We hereby consent to the use of this opinion as Exhibit 5(d) to the
Registration Statement. In giving such consent, we do not thereby admit that we
are within the category of persons whose consent is required pursuant to Section
7 of the Act or rules and regulations of the Securities and Exchange Commission.

                                Very truly yours,


                                /s/ DOERNER, SAUNDERS, DANIEL & ANDERSON




                                                                     Exhibit 8



                                Christy & Viener
                               Rockefeller Center
                                620 Fifth Avenue
                            New York, New York 10020



                                April 2, 1997




Public Service Company of Oklahoma
PSO Capital I
212 East Sixth Street
Tulsa, Oklahoma  74119-1212

Ladies and Gentlemen:

          We have acted as special tax counsel to you in connection with the
proposed offering by PSO Capital I, a Delaware statutory business trust (the
"Trust"), of its Trust Originated Preferred Securities, Series A (the "Series A
Preferred Securities"), as described in the Registration Statement on Form S-3,
as amended by Amendment No. 1 thereto (the "Registration Statement"), which is
being filed by Public Service Company of Oklahoma, an Oklahoma corporation (the
"Company"), the Trust, and PSO Capital II, a Delaware statutory business trust,
with the Securities and Exchange Commission pursuant to the Securities Act of
1933, as amended. The Registration Statement includes the Prospectus and the
Prospectus Supplement (collectively, the "Prospectuses") relating to such
offering.

          In rendering the opinion expressed below, we have examined the
Prospectuses and such other documents as we have deemed relevant and necessary,
including, without limitation, the Trust Agreement dated as of January 29, 1997,
the Form of the Amended and Restated Trust Agreement, the Form of the Indenture,
the Form of the First Supplemental Indenture, and the Form of the Guarantee
Agreement attached as Exhibits to the Registration Statement. Such opinion is
conditioned, among other things, upon the accuracy and completeness of the
facts, information, and representations contained in the Prospectuses as of the
date hereof and the continuing accuracy and completeness thereof as of the date
of the issuance of the Series A Preferred Securities. We have not undertaken any
independent investigation of any factual matters set forth in the Prospectuses
or such other documents. We have assumed that the transactions contemplated by
the Prospectuses and such other documents will occur as provided therein and
that there will be no material change to the Prospectuses or any of such other
documents between the date hereof and the date of the issuance of the Series A
Preferred Securities.

          Based upon and subject to the foregoing, we are of the opinion that
the discussion set forth in the Prospectus Supplement under the caption "CERTAIN
FEDERAL INCOME TAX CONSIDERATIONS" is a fair and accurate summary of the matters
addressed therein, based upon current law and the assumptions stated or referred
to therein.

          We assume no obligation to update or supplement this letter to reflect
any facts or circumstances which may hereafter come to our attention with
respect to the opinion expressed above, including any changes in applicable law
which may hereafter occur.

          We hereby consent to the filing of this letter as an Exhibit to the
Registration Statement and to the references to our firm under the captions
"CERTAIN FEDERAL INCOME TAX CONSIDERATIONS" and "LEGAL OPINIONS" in the
Prospectus Supplement.

                              Very truly yours,
                              /s/ Christy & Viener


Public Service Company of Oklahoma
Ratio of Earnings to Comined Fixed Charges
and Preferred Stock Dividend Requirements
(Unaudited)
<TABLE>
<CAPTION>


                                                                   Year Ended December 31,

                                             -----------------------------------------------------------
                                                   1996       1995        1994      1993        1992

                                             -----------------------------------------------------------
                                                               (thousands, except for ratios)
<S>                                              <C>           <C>       <C>       <C>       <C>
Operating Income                                 $101,737    $111,769    $ 98,258   $72,156   $ 78,096
Adjustments:
  Federal income taxes                             25,257      37,490      27,954    13,554      (835)
  Provision for deferred income taxes              (1,328)      2,704      7,779     9,537      21,157
  Deferred investment tax credits                  (2,784)     (2,789)     (2,789)   (2,838)    (2,711)
  Utility Plant development costs, net of tax     (35,708)        -           -         -          -
  Other income and deductions                         (95)      2,274         933       531       (940)
  Allowance for borrowed and equity
    funds used during construction                  1,722       3,734       2,513     1,948        740
  Interest portion of financing leases                -           -            -         17         37

                                             ------------------------------------------------------------------------------
                  Earnings                        $88,801    $155,182    $134,648    $94,905  $ 95,544

                                             ===========================================================================


Fixed Charges:
  Interest on long-term debt                      $30,555    $ 29,594    $ 29,594    $31,410  $ 30,688
  Interest on short-term debt and other             5,623       6,355       3,844      2,729     1,646
  Interest portion of financing leases                -           -           -           17        37
  Preferred stock dividend requirements             1,363       1,189       1,210      1,224     1,131

                                             ---------------------------------------------------------------------------
                                                  $37,541    $ 37,138    $ 34,648    $35,380  $ 33,502

                                             ===========================================================================


Ratio of earnings to combined fixed
  charges and preferred stock dividend
  requirements                                      2.37        4.18        3.89      2.68        2.85


</TABLE>


                                                                 Exhibit 23(a)


CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the incorporation by
reference in this Registration Statement of Public Service Company of Oklahoma
on Form S-3 of our report dated February 28, 1997 incorporated by reference in
the Annual Report on Form 10-K of Public Service Company of Oklahoma for the
year ended December 31, 1996, and to the reference to us under the headings
"Selected Financial Information" and "Experts" in the Prospectus, included in or
made a part of this Registration Statement.



                                         /S/ Arthur Andersen LLP


March 31, 1997








               THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED
PURSUANT TO RULE 901(d) OF REGULATION S-T



================================================================================
                                                       Exhibit 25(a)

                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) |__|



                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)


New York                                          13-5160382
(State of incorporation                           (I.R.S. employer
if not a U.S. national bank)                      identification no.)

48 Wall Street, New York, N.Y.                    10286
(Address of principal executive offices)          (Zip code)





                       PUBLIC SERVICE COMPANY OF OKLAHOMA
               (Exact name of obligor as specified in its charter)


Oklahoma                                          73-0410895
(State or other jurisdiction of                   (I.R.S. employer
incorporation or organization)                    identification no.)

212 East Sixth Street
Tulsa, Oklahoma                                   74119-1212
(Address of principal executive offices)          (Zip code)

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

               Junior Subordinated Deferrable Interest Debentures
                      (Title of the indenture securities)


================================================================================


1.   General information.  Furnish the following information as to the Trustee:

     (a)      Name and address of each examining or supervising authority to
               which it is subject.

- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

         Superintendent of Banks of the State of     2 Rector Street, New York,
         New York                                    N.Y.  10006, and Albany, 
                                                     N.Y. 12203

         Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                     N.Y.  10045

         Federal Deposit Insurance Corporation       Washington, D.C.  20429

         New York Clearing House Association         New York, New York  10005

     (b)      Whether it is authorized to exercise corporate trust powers.

         Yes.

2.   Affiliations with Obligor.

     If the obligor is an affiliate of the trustee, describe each such
     affiliation.

         None.

16.  List of Exhibits.

     Exhibits identified in parentheses below, on file with the Commission, are
     incorporated herein by reference as an exhibit hereto, pursuant to Rule
     7a-29 under the Trust Indenture Act of 1939 (the "Act") and Rule 24 of the
     Commission's Rules of Practice.

          1.   A copy of the  Organization  Certificate  of The Bank of New York
               (formerly Irving Trust Company) as now in effect,  which contains
               the  authority  to  commence  business  and a grant of  powers to
               exercise corporate trust powers. (Exhibit 1 to Amendment No. 1 to
               Form T-1 filed with Registration Statement No. 33-6215,  Exhibits
               1a and 1b to Form  T-1  filed  with  Registration  Statement  No.
               33-21672  and  Exhibit  1 to Form  T-1  filed  with  Registration
               Statement No. 33-29637.)

          4.   A copy of the existing By-laws of the Trustee. (Exhibit 4 to Form
               T-1 filed with Registration Statement No. 33-31019.)


                                                     


 THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
     901(d) OF REGULATION S-T

          6.   The consent of the Trustee required by Section 321(b) of the Act.
               (Exhibit  6 to Form T-1 filed  with  Registration  Statement  No.
               33-44051.)

          7.   A copy of the latest report of condition of the Trustee published
               pursuant  to law or to the  requirements  of its  supervising  or
               examining authority.







                                    SIGNATURE



         Pursuant to the requirements of the Act, the Trustee, The Bank of New
York, a corporation organized and existing under the laws of the State of New
York, has duly caused this statement of eligibility to be signed on its behalf
by the undersigned, thereunto duly authorized, all in The City of New York, and
State of New York, on the 24th day of March, 1997.


                                             THE BANK OF NEW YORK



                                             By:    /S/MARY LAGUMINA
                                             Name:  MARY LAGUMINA
                                             Title: ASSISTANT VICE PRESIDENT



                                                             -4-





                                                            




    THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
901(d) OF REGULATION S-T



================================================================================

                                                            Exhibit 25(b)
                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) |__|



                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)


New York                                          13-5160382
(State of incorporation                           (I.R.S. employer
if not a U.S. national bank)                      identification no.)

48 Wall Street, New York, N.Y.                    10286
(Address of principal executive offices)          (Zip code)





                       PUBLIC SERVICE COMPANY OF OKLAHOMA
               (Exact name of obligor as specified in its charter)


Oklahoma                                          73-0410895
(State or other jurisdiction of                   (I.R.S. employer
incorporation or organization)                    identification no.)

212 East Sixth Street
Tulsa, Oklahoma                                   74119-1212
(Address of principal executive offices)          (Zip code)

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

                      Guarantee of Preferred Securities of
                PSO Capital I(Title of the indenture securities)


================================================================================




1.   General information.  Furnish the following information as to the Trustee:

     (a)   Name and address of each examining or supervising authority to
           which it is subject.

- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

         Superintendent of Banks of the State of     2 Rector Street, New York,
         New York                                    N.Y.  10006, and Albany, 
                                                     N.Y. 12203

         Federal Reserve Bank of New York            33 Liberty Plaza, New York,
                                                     N.Y.  10045

         Federal Deposit Insurance Corporation       Washington, D.C.  20429

         New York Clearing House Association         New York, New York  10005

   (b)   Whether it is authorized to exercise corporate trust powers.

         Yes.

2.       Affiliations with Obligor.

         If the obligor is an affiliate of the trustee, describe each such
         affiliation.

         None.

16.      List of Exhibits.

         Exhibits identified in parentheses below, on file with the Commission,
         are incorporated herein by reference as an exhibit hereto, pursuant to
         Rule 7a-29 under the Trust Indenture Act of 1939 (the "Act") and Rule
         24 of the Commission's Rules of Practice.

         1.    A copy of the Organization Certificate of The Bank of New York
               (formerly Irving Trust Company) as now in effect, which contains
               the authority to commence business and a grant of powers to
               exercise corporate trust powers.  (Exhibit 1 to Amendment No.1 to
               Form T-1 filed with Registration Statement No. 33-6215, Exhibits
               1a and 1b to Form T-1 filed with Registration Statement
               No. 33-21672 and Exhibit 1 to Form T-1 filed with Registration
               Statement No. 33-29637.)

         4.    A copy of the existing By-laws of the Trustee.  (Exhibit 4 to
               Form T-1 filed with Registration Statement No. 33-31019.)



                                                       


    THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
901(d) OF REGULATION S-T

         6.       The consent of the Trustee required by Section 321(b) of the
                  Act.  (Exhibit 6 to Form T-1 filed with Registration Statement
                  No. 33-44051.)

         7.       A copy of the latest report of condition of the Trustee
                  published pursuant to law or to the requirements of its
                  supervising or examining authority.







                                    SIGNATURE



         Pursuant to the requirements of the Act, the Trustee, The Bank of New
York, a corporation organized and existing under the laws of the State of New
York, has duly caused this statement of eligibility to be signed on its behalf
by the undersigned, thereunto duly authorized, all in The City of New York, and
State of New York, on the 24th day of March, 1997.


                                             THE BANK OF NEW YORK



                                             By:/S/MARY LAGUMINA
                                             Name:  MARY LAGUMINA
                                             Title: ASSISTANT VICE PRESIDENT




                                                                


 THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
 901(d) OF REGULATION S-T



================================================================================
                                                        Exhibit 25(c)

                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) |__|



                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)


New York                                               13-5160382
(State of incorporation                                (I.R.S. employer
if not a U.S. national bank)                           identification no.)

48 Wall Street, New York, N.Y.                          10286
(Address of principal executive offices)                (Zip code)





                                  PSO CAPITAL I
               (Exact name of obligor as specified in its charter)


Delaware                                               To be applied for
(State or other jurisdiction of                        (I.R.S. employer
incorporation or organization)                         identification no.)

212 East Sixth Street
Tulsa, Oklahoma                                        74119-1212
(Address of principal executive offices)               Zip code)

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

                              Preferred Securities
                       (Title of the indenture securities)


================================================================================




1.  General information.  Furnish the following information as to the Trustee:

    (a)      Name and address of each examining or supervising authority to
               which it is subject.

- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

 Superintendent of Banks of the State of          2 Rector Street, New York,
 New York                                         N.Y.  10006, and Albany, N.Y.
                                                  12203

 Federal Reserve Bank of New York                 33 Liberty Plaza, New York,
                                                  N.Y.  10045

 Federal Deposit Insurance Corporation            Washington, D.C.  20429

 New York Clearing House Association              New York, New York   10005

   (b)      Whether it is authorized to exercise corporate trust powers.

         Yes.

2.       Affiliations with Obligor.

         If the obligor is an affiliate of the trustee, describe each such
          affiliation.

         None.

16.      List of Exhibits.

         Exhibits identified in parentheses below, on file with the Commission,
         are incorporated herein by reference as an exhibit hereto, pursuant to
         Rule 7a-29 under the Trust Indenture Act of 1939 (the "Act") and Rule
         24 of the Commission's Rules of Practice.

         1.    A copy of the Organization Certificate of The Bank of New York
               (formerly Irving Trust Company) as now in effect, which contains
               the authority to commence business and a grant of powers to
               exercise corporate trust powers.  (Exhibit 1 to Amendment No. 1
               to Form T-1 filed with Registration Statement No. 33-6215,
               Exhibits 1a and 1b to Form T-1 filed with Registration Statement
               No. 33-21672 and Exhibit 1 to Form T-1 filed with Registration
               Statement No. 33-29637.)

         4.    A copy of the existing By-laws of the Trustee.  (Exhibit 4 to
               Form T-1 filed with Registration Statement No. 33-31019.)



                                      

 THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
901(d) OF REGULATION S-T

         6.    The consent of the Trustee required by Section 321(b) of the
               Act.  (Exhibit 6 to Form T-1 filed with Registration Statement
               No. 33-44051.)

         7.    A copy of the latest report of condition of the Trustee published
               pursuant to law or to the requirements of its supervising or
               examining authority.







                                    SIGNATURE



         Pursuant to the requirements of the Act, the Trustee, The Bank of New
York, a corporation organized and existing under the laws of the State of New
York, has duly caused this statement of eligibility to be signed on its behalf
by the undersigned, thereunto duly authorized, all in The City of New York, and
State of New York, on the 24th day of March, 1997.


                                        THE BANK OF NEW YORK



                                       By:/S/MARY LAGUMINA
                                          Name:  MARY LAGUMINA
                                          Title: ASSISTANT VICE PRESIDENT






                                                                


  THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
901(d) OF REGULATION S-T



================================================================================
                                                   Exhibit 25(d)

                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) |__|



                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)


New York                                          13-5160382
(State of incorporation                           (I.R.S. employer
if not a U.S. national bank)                      identification no.)

48 Wall Street, New York, N.Y.                    10286
(Address of principal executive offices)          (Zip code)





                       PUBLIC SERVICE COMPANY OF OKLAHOMA
               (Exact name of obligor as specified in its charter)


Oklahoma                                          73-0410895
(State or other jurisdiction of                   (I.R.S. employer
incorporation or organization)                    identification no.)

212 East Sixth Street
Tulsa, Oklahoma                                   74119-1212
(Address of principal executive offices)          (Zip code)

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

                      Guarantee of Preferred Securities of
                PSO Capital II(Title of the indenture securities)


================================================================================




1.       General information.  Furnish the following information as to the
          Trustee:

         (a)      Name and address of each examining or supervising authority
          to which it is subject.

- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

Superintendent of Banks of the State of        2 Rector Street, New York,
New York                                       N.Y.  10006, and Albany, 
                                               N.Y. 12203

Federal Reserve Bank of New York               33 Liberty Plaza, New York,
                                               N.Y.  10045

Federal Deposit Insurance Corporation          Washington, D.C.  20429

New York Clearing House Association            New York, New York  10005

         (b)      Whether it is authorized to exercise corporate trust powers.

         Yes.

2.       Affiliations with Obligor.

         If the obligor is an affiliate of the trustee, describe each such
          affiliation.

         None.

16.      List of Exhibits.

         Exhibits identified in parentheses below, on file with the Commission,
         are incorporated herein by reference as an exhibit hereto, pursuant to
         Rule 7a-29 under the Trust Indenture Act of 1939 (the "Act") and Rule
         24 of the Commission's Rules of Practice.

               1.   A copy of the  Organization  Certificate  of The Bank of New
                    York (formerly Irving Trust Company) as now in effect, which
                    contains the  authority to commence  business and a grant of
                    powers to exercise  corporate  trust  powers.  (Exhibit 1 to
                    Amendment   No. 1  to  Form  T-1  filed  with   Registration
                    Statement No. 33-6215,  Exhibits 1a and 1b to Form T-1 filed
                    with  Registration  Statement No.  33-21672 and Exhibit 1 to
                    Form T-1 filed with Registration Statement No. 33-29637.)

               4.   A copy of the existing By-laws of the Trustee. (Exhibit 4 to
                    Form T-1 filed with Registration Statement No. 33-31019.)

                                  

  THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE
901(d) OF REGULATION S-T

         6.       The consent of the Trustee required by Section 321(b) of the
                  Act.  (Exhibit 6 to Form T-1 filed with Registration Statement
                  No. 33-44051.)

         7.       A copy of the latest report of condition of the Trustee
                  published pursuant to law or to the requirements of its
                  supervising or examining authority.






                                    SIGNATURE



          Pursuant to the requirements of the Act, the Trustee, The Bank of New
     York, a corporation organized and existing under the laws of the State of
     New York, has duly caused this statement of eligibility to be signed on its
     behalf by the undersigned, thereunto duly authorized, all in The City of
     New York, and State of New York, on the 24th day of March, 1997.

                                          THE BANK OF NEW YORK



                                          By:/S/MARY LAGUMINA
                                             Name:  MARY LAGUMINA
                                             Title: ASSISTANT VICE PRESIDENT



                                     



                                                            

 THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE 
901(d) OF REGULATION S-T



================================================================================
                                                        Exhibit 25(e)

                                    FORM T-1

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            STATEMENT OF ELIGIBILITY
                   UNDER THE TRUST INDENTURE ACT OF 1939 OF A
                    CORPORATION DESIGNATED TO ACT AS TRUSTEE

                      CHECK IF AN APPLICATION TO DETERMINE
                      ELIGIBILITY OF A TRUSTEE PURSUANT TO
                             SECTION 305(b)(2) |__|



                              THE BANK OF NEW YORK
               (Exact name of trustee as specified in its charter)


New York                                       13-5160382
(State of incorporation                        (I.R.S. employer
if not a U.S. national bank)                   identification no.)

48 Wall Street, New York, N.Y.                 10286
(Address of principal executive offices)       (Zip code)





                                 PSO CAPITAL II
               (Exact name of obligor as specified in its charter)


Delaware                                     To be applied for
(State or other jurisdiction of              (I.R.S. employer
incorporation or organization)               identification no.)

212 East Sixth Street
Tulsa, Oklahoma                              74119-1212
(Address of principal executive offices)     (Zip code)

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

                              Preferred Securities
                       (Title of the indenture securities)


================================================================================



1.  General information.  Furnish the following information as to the Trustee:

    (a)   Name and address of each examining or supervising authority to which 
it is subject.

- --------------------------------------------------------------------------------
                  Name                                        Address
- --------------------------------------------------------------------------------

Superintendent of Banks of the State of      2 Rector Street, New York,
New York                                     N.Y.  10006, and Albany, N.Y. 
                                             12203

Federal Reserve Bank of New York             33 Liberty Plaza, New York,
                                             N.Y.  10045

Federal Deposit Insurance Corporation        Washington, D.C.  20429

New York Clearing House Association          New York, New York   10005

         (b)      Whether it is authorized to exercise corporate trust powers.

         Yes.

2.       Affiliations with Obligor.

         If the obligor is an affiliate of the trustee, describe each such
affiliation.

         None.

16.      List of Exhibits.

         Exhibits identified in parentheses below, on file with the Commission,
         are incorporated herein by reference as an exhibit hereto, pursuant to
         Rule 7a-29 under the Trust Indenture Act of 1939 (the "Act") and Rule
         24 of the Commission's Rules of Practice.

         1.       A copy of the Organization Certificate of The Bank of New York
                  (formerly Irving Trust Company) as now in effect, which
                  contains the authority to commence business and a grant of
                  powers to exercise corporate trust powers. (Exhibit 1 to
                  Amendment No. 1 to Form T-1 filed with Registration Statement
                  No. 33-6215, Exhibits 1a and 1b to Form T-1 filed with
                  Registration Statement No. 33-21672 and Exhibit 1 to Form T-1
                  filed with Registration Statement No. 33-29637.)

         4.       A copy of the existing By-laws of the Trustee.  (Exhibit 4 to 
                  Form T-1 filed with Registration Statement No. 33-31019.)



THIS CONFORMING PAPER FORMAT DOCUMENT IS BEING SUBMITTED PURSUANT TO RULE 
901(d) OF REGULATION S-T

         6.    The consent of the Trustee required by Section 321(b) of the
               Act.  (Exhibit 6 to Form T-1 filed with Registration Statement
               No. 33-44051.)

         7.    A copy of the latest report of condition of the Trustee published
               pursuant to law or to the requirements of its supervising or 
               examining authority.







                                    SIGNATURE



         Pursuant to the requirements of the Act, the Trustee, The Bank of New
York, a corporation organized and existing under the laws of the State of New
York, has duly caused this statement of eligibility to be signed on its behalf
by the undersigned, thereunto duly authorized, all in The City of New York, and
State of New York, on the 24th day of March, 1997.


                                             THE BANK OF NEW YORK



                                             By:/S/MARY LAGUMINA
                                                Name:  MARY LAGUMINA
                                                Title: ASSISTANT VICE PRESIDENT



<PAGE>






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