EX-99.f




                       INTERSTATE POWER COMPANY
                   IRREVOCABLE TRUST AGREEMENT 1990



     THIS TRUST AGREEMENT is effective April  30,  1990,  by and between
Interstate Power Company, a corporation organized and existing under the
laws of the State of Delaware  (the "Company"),  and American Trust and
Savings Bank (the "Trustee").

                         W I T N E S S E T H :

     WHEREAS, the Company, by resolution of its Board of Directors, has
adopted  the  Interstate  Power  Company  General  Creditor 
Supplemental Retirement Plan (the "Plan", which Plan and all the terms
defined therein are hereby incorporated by reference) for the benefit of
Participants under the Plan and,  in order to aid in the proper
execution of the Plan, has authorized the simultaneous adoption of this
Trust Agreement; and

     WHEREAS,  the Trustee has  agreed and does  agree to the terms  and
conditions of this Trust Agreement;

     NOW, THEREFORE, the premises considered, it is agreed by and
between the Company and the Trustee, as follows:


                               ARTICLE I
                         Trust and Definitions

1.1  Trust.   The Company hereby establishes with the Trustee a trust
     (the "Trust") for the benefit of Participants under the Plan, to be
     known as  the  Interstate  Power  Company  Irrevocable  Trust 
     Agreement, consisting of (i) such contributions as have been or
     shall be received by the Trustee from the Company, or any successor
     to the Company, or any affiliate or subsidiary of the Company that
     has adopted the Plan and  that  adopts  the  Trust  (separately  or 
     jointly  known  as  the "Company"), in accordance with the
     provisions of the Plan, and (ii) any net income on such
     contributions.  The Trust is intended to be a grantor trust  as 
     contemplated under  Section  671  of  the  Internal Revenue Code of
     1986,  and the Trust Agreement shall be construed accordingly. The
     Trustee shall receive such contributions in trust and shall hold
     such contributions and the income thereon separate and apart from
     other funds of the Company to be used exclusively for the purposes
     herein set forth, shall hold and administer the same as a single 
     Trust  Fund,  shall  invest  and  reinvest  the  same  without
     distinction between principal  and  income,  and shall pay over and
     distribute the same in accordance with the provisions of the Trust
     Agreement and the Plan.

1.2  Effective Date.   The effective date of the Trust is April 30,   
     1990.
                              ARTICLE II
                         Payments to the Trust

Receipt of Payments.   The Company may from time to time remit
contributions in cash or annuity or insurance contracts in trust to the
Trustee.  Premium payments made by the Company to annuity or insurance
contracts registered in the name of the Trustee  shall  be considered
cash remitted to the Trustee.  Such contributions, together with any
income thereon,  shall be held in trust on behalf of Participants under
the Plan.  The Trustee shall be accountable therefore to the Company,
but shall have no right or duty to enforce collection of any
contribution from the Company.


                              ARTICLE III
                   Powers and Duties of the Trustee

3.1  General.   The Trustee shall hold the Trust Fund subject to the
     terms and purposes of the Plan and the Trust.

3.2  Standard.   The Trustee shall act with the care, skill, prudence
     and diligence under the circumstances then prevailing that a
     prudent man acting in a like capacity and familiar with such
     matters would use in the conduct of an enterprise of a like
     character and with like aims.

3.3  Liability.   The Trustee shall incur no liability to anyone for any
     action taken pursuant to a direction,  request or approval by the
     Company that is contemplated by and in compliance with the terms of
     the Trust Agreement, or for any action or omission of the Company
     with respect to the performance of its duties and obligations under
     the Plan.  The Trustee shall not be required to undertake or defend
     any litigation arising in connection with this Trust Agreement,
     unless the Trustee be first indemnified by the Company against its
     prospective costs,  expenses and liabilities,  and the Company
     hereby agrees to indemnify the Trustee for such costs, expenses and
     liabilities.  The Trustee shall be indemnified and held harmless by
     the Company against liability or losses occurring by reason of any
     act or omission of the Trustee under this Trust Agreement, unless
     such act or omission is due to  the  Trustee's  own  gross 
     negligence  or  willful  nonfeasance, malfeasance, or misfeasance.

3.4  Taxes and Expenses.

     (a)  Any federal, state or local taxes which may be imposed upon
          the trust fund,  or any part thereof,  or upon the income
          thereon, shall be paid by the Company.

     (b)  The Company shall pay to the Trustee all reasonable expenses
          properly  and  actually  incurred  by  the  Trustee  in  the
          administration  of  this  Trust,  including  but  not  limited 
          to accounting,   insurance   (including  fiduciary  insurance 
          that provides  for  recourse against  the  fiduciary), 
          consulting  and legal  expenses,   and  reasonable 
          compensation  for  services performed by the Trustee as the
          Trustee hereunder as shall be agreed upon from time to time by
          the Company and Trustee in writing.

3.5  Tenure in Office.   Any Trustee may resign upon giving thirty (30)
     days written notice to the Company.  Upon thirty (30) days written
     notice, unless a shorter period is agreed to, the Company shall
     have the power to remove any Trustee for any reason.

3.6  Successor Trustee.    The Company shall have the power to appoint
     a successor Trustee.   The  appointment  of  a  successor Trustee 
     shall become effective upon acceptance in writing of such
     appointment by the successor Trustee.  The successor Trustee shall
     be a corporate Trustee and shall have no liability for events
     occurring prior to the time the successor  Trustee  assumed  its 
     Trustee  duties  hereunder.   Every successor Trustee appointed to
     and accepting a trusteeship hereunder shall  have  all  the 
     rights,  title,  power,  duties,  exemptions  and limitations of
     the original Trustee.


                              ARTICLE IV
                           Investment Powers

4.1  Investments.  The Trustee shall, as directed by the Company, 
     invest and reinvest the principal and income of the Trust Fund and
     keep the Trust Fund invested, without distinction between principal
     and income, in the following:

     (a)  annuity or insurance contracts applied for by either the
          Company or the Trustee, registered in the name of the Trustee
          and issued by an insurance and annuity company organized under
          the laws of any state,  district or commonwealth of the United
          States of America.

     (b)  insured trust money market accounts.

4.2  Additional Powers.   The Trustee,  when specifically directed by
     the Company, shall have the following additional powers and
     authority with respect to property constituting a part of the Trust
     Fund:

     (a)  To invest in bonds, notes, bills, or other obligations insured
          or guaranteed as to principal and interest by the United
          States of America or any agency thereof.

     (b)  To invest in collective investment funds maintained by the
          Trustee .

     (c)  To sell, exchange or transfer any such property at public or
          private sale for cash or on credit.

     (d)  To commence or defend suits or legal proceedings and to
          represent the Trust in all suits or legal proceedings;  to
          settle, compromise or submit to arbitration, any claims, debts
          or damages due or owing to or from the Trust.

     (e)  To exercise, personally or by general or by limited power of
          attorney, any right, including the right to vote, appurtenant
          to any securities or other property held by it any time.


     (f)  To employ suitable agents and counsel and to pay their
          reasonable expenses and compensation.

     (g)  To transfer, convert, terminate, exchange or cash in  any
          insurance contract or annuity contract.

     (h)  To exercise, generally, any of the powers which an individual
          owner might exercise in connection with property held by the
          Trust Fund, and to do all other acts that the Trustee may deem
          necessary or proper to carry out any of the powers set forth
          herein or otherwise in the best interests of the Trust Fund.

4.3  The Company plans on acquiring an annuity contract for each
     participant who is entitled to benefits under the Plan at the time
     of the participant's retirement.  The size of the annuity contract
     will be sufficient to pay the monthly benefit due to the
     participant under the Plan.  Company will acquire an annuity
     contract either directly and then transfer the annuity contract to
     the Trustee or transfer sufficient cash to the Trustee so that the
     Trustee can acquire the annuity contract or instruct Trustee to use
     the cash value of any life insurance contract on participant to
     acquire the annuity contract.


                               ARTICLE V
                         Accounts and Records

5.1  Records.  The Trustee shall keep accurate and detailed records of
     all investments, receipts, disbursements, and  all other
     transactions required with regard to the general account, including
     such specific records as shall be agreed upon in writing between
     the Company and the Trustee.  All  such accounts, books and records
     shall be open to inspection and audit at all reasonable times by
     the Company and by Participants.

5.2  Reports.

     (a)  Within sixty (60) days after the end of each plan year and
          within sixty (60) days after the removal or resignation of the
          Trustee, the Trustee shall render a written report to the
          Chairman of the Board of Directors of Company containing a
          complete accounting showing the total assets in the Trust as
          of the latest Valuation Date and the fair market value placed
          on each asset as of that date,  as  well as a statement of
          purchases, sales and any investment charges and all income,
          expenses, and disbursements since the last such report.  Such
          report shall be in such form and contain  such other
          information as shall be required in writing by the Chairman of
          the Board of Directors of Company.

     (b)  The approval of the Chairman of the Board of Directors of the
          Company or the lack of written objection within ninety (90)
          days after submission of any report or accounting by the
          Trustee shall be a complete release and discharge of the
          Trustee as to the information contained therein, unless the
          Trustee has breached its  fiduciary duty in the preparation of
          such report or accounting.

5.3  Valuation.   The Trustee shall value all assets of the Trust Fund
     at least annually on the last day of December each year, or on such
     other day as is mutually agreed to by the Company and the Trustee
     (the "Valuation Date").


                              ARTICLE VI
                     Payments From the Trust Fund

6.1  Payments Generally.  The Trustee shall make payments out of the
     Trust Fund to Participants in such manner and in such  amounts as
     are required under the Plan or the Trustee can make a revocable
     direction to an annuity company to make payments directly to a
     Participant.  If the Trustee has  authorized an annuity company to
     make payments directly, Trustee shall have no liability to Company
     or Participant for any payments which should have been made by such
     annuity company.

6.2  Payments by Company.  If the Trust Fund or any annuity contract is
     not sufficient to make payments to Participants in accordance with
     the Plan, the Company shall make the balance of each such payment
     as it falls due.

6.3  Payments Only Under the Plan.  Except as provided in Section 8.1 of
     the Trust Agreement,  the Company shall have no right or power to
     direct the Trustee to return any assets of the Trust to the Company
     or to divert any assets of the Trust to any purpose other than the
     payment of benefits in accordance with the Plan.


                              ARTICLE VII
                    Trust Fund Subject to Creditors

7.1  Trust Assets.   All assets of the Trust shall be subject to  the
     respective claims of the general creditors of the Company but only
     under circumstances in which the Company has filed for bankruptcy,
     has been placed in bankruptcy by the Company's creditors, or is
     considered insolvent for purposes of the laws of the State of
     Delaware such that the assets of the Company prove insufficient to
     meet its current financial obligations as they become due.

7.2  Insolvency of the Company.  The Chairman of the Board of Directors
     of the Company shall have the duty to notify the Trustee
     immediately in the event the Company reaches the point of
     insolvency, files for bankruptcy, or is placed in bankruptcy by the
     Company's creditors.  The Trustee shall have no duty to determine
     whether the company is insolvent or bankrupt and shall only follow
     the directions of the Chairman of the Board of Directors of the
     Company.

7.3  Distribution of Trust Assets to Creditors.   Where the Company has
     filed for bankruptcy, is placed in bankruptcy  by the Company's
     creditors, or is considered insolvent, the Trustee shall
     discontinue payments of benefits under the Plan and shall notify
     annuity companies to do the  same and shall hold for the benefit of
     the Company's creditors all cash and other assets then held in the
     Trust Fund, after deduction of any fees, expenses or taxes properly
     due and payable from the Trust Fund. The Trustee shall deliver
     assets of the Trust to satisfy claims of the Company's creditors,
     as directed by a court of competent  jurisdiction.  The Trustee
     shall resume or cause to be resumed payments of benefits in
     accordance with the Plan only after the Trustee has been notified
     by the Chairman of  the Board of Directors of the Company that the
     Company is no longer insolvent or in bankruptcy.


                             ARTICLE VIII
                       Amendment and Termination

8.1  Termination.  The Trust shall be irrevocable and shall not
     terminate until the date on which no Participant is entitled to any
     payment under Article VI hereof.  Upon such termination of the
     Trust, any assets remaining in the Trust shall be returned to the
     Company.

8.2  Amendment.  The Company hereby expressly waives all rights and
     powers to amend this Trust Agreement or alter the Trust hereby
     created in whole or in part, except by a written instrument
     executed by the Company and Trustee and consented to by the
     Participants.  Under no circumstances, however, may the Trust or
     Trust Agreement be altered or amended to make the Trust revocable.

     The annuity or insurance company shall not be required to look into
     the terms of this Trust or question any action of the Trustee, nor
     shall it be responsible to see that any action of the Trustee is
     authorized.  The annuity or insurance company shall act only upon
     the written direction of the Trustee and shall be fully discharged
     from any and all liability for any amount paid to the Trustee or
     paid in accordance with the direction of the Trustee or for any
     change made or action taken upon such direction; and shall not be
     obligated to see that any money paid by it to the Trustee or to any
     person shall be properly distributed or applied.  Any instrument
     executed by the company shall be without liability in taking,
     permitting, or omitting any action on the faith of any such
     instrument and shall incur no liability or responsibility for doing
     so.


                              ARTICLE IX
                             Miscellaneous

9.1  No Assignment.   Except to the extent required by the Plan or by
     applicable law, the interest of Participants in the Trust shall not
     be subject in any way to alienation, sale, transfer, assignment,
     pledge, attachment, garnishment, execution or encumbrance of any
     kind, or to garnishment, attachment, levy or execution on any kind
     for the debts or defaults of the Trustee or of any person, natural
     or legal, having an interest in the Trust; any attempt to
     accomplish the same shall be void.

9.2  Governing Law and Severability.    The validity and construction of
     any provision of this Trust shall be governed by the laws of the
     State of Iowa, except as provided in Section 7.1.  If any provision
     of this Trust Agreement shall be declared invalid or unenforceable
     by a court of competent jurisdiction, the remaining provisions
     hereof shall remain valid and shall continue in effect.
9.3  Binding Effect on Successor.  This Trust Agreement shall be binding
     upon and inure to the benefit of any successor to the Company or
     its business as the result of merger,  consolidation,
     reorganization, transfer of assets or otherwise and any subsequent
     successor thereto. In no event shall any such merger,
     consolidation, reorganization, transfer of assets or other similar
     transaction suspend or delay the rights of any Participant to
     receive benefits hereunder.

9.4  Participant's Rights.  A Participant shall have no right, claim, or
     other cause of action against the Trustee or the Trust, except to
     the extent necessary to enforce the Participant's rights under the
     Plan. All assets held in the Trust shall at all times be subject to
     the terms of the Trust, and distribution of assets shall be made
     solely pursuant to the terms of the Trust.

9.5  Reversion to the Company.  No provision of the Plan nor any
     amendment shall cause any of the assets of the Trust to revert to
     the Company except as follows:

     (a)  Trustee can assign to Company any insurance contract on the
          life of an individual who is no longer a Participant or for
          whom a separate annuity contract has been purchased; or

     (b)  If a Participant dies, any sum received by Trustee on any
          annuity contract or insurance contract acquired on the
          Participant who died shall be distributed to Company; or

     (c)  Any other assets remaining after all liabilities to
          Participants have been satisfied, shall be distributed to the
          Company.

9.6  Treatment of Payments.  Any amount distributed from this Trust or
     as directed by Trustee shall not be deemed salary or other
     compensation to the Participant for the purpose of computing
     benefits to which the Participant may be entitled under any
     qualified retirement plan or other arrangement of the Company for
     the benefit of employees, except as may be otherwise specified in
     such plan or arrangement.

9.7  No Right to Participate.  No person shall have any claim or right
     to become a Participant under the Plan by reason of this Trust
     Agreement.

9.8  General Undertaking.   All parties to this Trust and all persons
     claiming any interest whatsoever hereunder agree to perform any and
     all acts and execute any and all documents and papers which may be
     necessary or desirable for the carrying out of the Trust or any of
     its provisions .
 
9.9  Masculine, Feminine, Singular and Plural.   The masculine shall be
     read in the feminine, the singular in the plural, and vice versa,
     wherever the context shall so require.

9.10 Notices.  Notices, accounting, and reports required to begiven by
the Trustee or the Company may be given by personal  delivery or by
certified mail (return  receipt  requested)  addressed to the party
involved at the last address of such party recorded on the general
address files of the Trustee or the company.  If given by mail, the date
of mailing shall be deemed to be the date as of which the same was given
or furnished to the addressee.  Any notice required under the Trust may
be waived in writing by the person entitled to such notice.

The foregoing instrument may be executed in one or more counterparts,
each of which shall be deemed an original and all of which together
shall be deemed one instrument.

IN WITNESS WHEREOF,  the Company has caused this Trust Agreement to be
executed by its duly authorized officer and the Trustee has caused this
Trust Agreement to be executed and accepted by its duly authorized
officer as of the year and day first above written.


                                        INTERSTATE POWER COMPANY

Attest:   Judith A. Palm /s/            By W. H. Stoppelmoor /s/  
(SEAL)                                  Title: President         


                                        TRUSTEE
Attest: Robert J. Donovan /s/           By:  Leo J. Meier /s/    

                                        Title: Ex. V. Pres.