Exhibit 4(a)

                                   TRUST AGREEMENT
                              OF MONTANA POWER CAPITAL I


                  This TRUST AGREEMENT of Montana Power Capital I (the
        "Trust"), dated as of October__, 1996, among (i) The Montana Power
        Company, a Montana corporation (the "Depositor"), (ii) The Bank of New
        York, a New York banking corporation, not in its individual capacity
        but solely as trustee of the Trust, (iii) The Bank of New York
        (Delaware), a Delaware banking corporation, not in its individual
        capacity but solely as trustee of the Trust, and (iv) Ellen M.
        Senechal, an individual employed by the Depositor, not in her
        individual capacity but solely as trustee of the Trust (the
        "Administrative Trustee") (each of such trustees in (ii), (iii) and
        (iv) a "Trustee" and collectively, the "Trustees").  The Depositor and
        the Trustees hereby agree as follows:

                  1.   The trust created hereby shall be known as "Montana
        Power Capital I", in which name the Trustees, or the Depositor to the
        extent provided herein, may conduct the business of the Trust, make
        and execute contracts, and sue and be sued.

                  2.   The Depositor hereby assigns, transfers, conveys and
        sets over to the Trustees the sum of $10.  The Trustees hereby
        acknowledge receipt of such amount in trust from the Depositor, which
        amount shall constitute the initial trust estate.  The Trustees hereby
        declare that they will hold the trust estate in trust for the
        Depositor.  It is the intention of the parties hereto that the Trust
        created hereby constitute a business trust under Chapter 38 of Title
        12 of the Delaware Code, 12 Del. C. Section 3801 et seq. (the 
                                   -------               -------
        "Business Trust Act"), and that this document constitutes the 
        governing instrument of the Trust.  The Trustees are hereby authorized
        and directed to execute and file a certificate of trust with the
        Secretary of State of the State of Delaware in accordance with the
        provisions of the Business Trust Act.

                  3.   The Depositor and the Trustees will enter into an
        amended and restated Trust Agreement, satisfactory to each such party
        and substantially in the form to be included as an exhibit to the 1933
        Act Registration Statement referred to below, to provide for the
        contemplated operation of the Trust created hereby and the issuance of
        the Preferred Securities and Common Securities referred to therein. 
        Prior to the execution and delivery of such amended and restated Trust
        Agreement, the Trustees shall not have any duty or obligation
        hereunder or with respect of the trust estate, except as otherwise
        required by applicable law or as may be necessary to obtain prior to
        such execution and delivery any licenses, consents or approvals
        required by applicable law or otherwise.  The Administrative Trustee
        is hereby authorized and directed, on behalf of the Trust, to execute
        and deliver an underwriting agreement in respect of the sale of the
        Preferred Securities in such form as the Depositor shall approve.

                  4.   The Depositor and the Trustees hereby authorize and
        direct the Depositor (i) to prepare and file with the Securities and
        Exchange Commission (the "Commission") and execute, in each case on
        behalf of the Trust, (a) a Registration Statement on Form S-3 (the
        "1933 Act Registration Statement"), including any pre-effective or
        post-effective amendments to the 1933 Act Registration Statement,
        relating to the registration under the Securities Act of 1933, as
        amended, of the Preferred Securities of the Trust and certain other
        securities and (b) a Registration Statement on Form 8-A (the "1934 Act
        Registration Statement") (including all pre-effective and post-
        effective amendments thereto) relating to the registration of the
        Preferred Securities of the Trust under Section 12(b) of the
        Securities Exchange Act of 1934, as amended; (ii) to prepare and file
        with the New York Stock Exchange (the "Exchange") and execute on
        behalf of the Trust a listing application and all other applications,
        statements, certificates, agreements and other instruments as shall be
        necessary or desirable to cause the Preferred Securities to be listed
        on the Exchange and (iii) to prepare and file and execute on behalf of
        the Trust such applications, reports, surety bonds, irrevocable
        consents, appointments of attorney for service of process and other
        papers and documents as shall be necessary or desirable to register
        the Preferred Securities under the securities or blue sky laws of such
        jurisdictions as the Depositor, on behalf of the Trust, may deem
        necessary or desirable.  In the event that any filing referred to
        above is required by the rules and regulations of the Commission, the
        Exchange or state securities or blue sky laws, to be executed on
        behalf of the Trust by one or more of the Trustees, each of the
        Trustees, in its or his capacity as Trustee of the Trust, is hereby
        authorized and, to the extent so required, directed to join in any
        such filing and to execute on behalf of the Trust any and all of the
        foregoing, it being understood that The Bank of New York and The Bank
        of New York (Delaware), in their capacities as Trustees of the Trust,
        respectively, shall not be required to join in any such filing or
        execute on behalf of the Trust any such document unless required by
        the rules and regulations of the Commission, the Exchange or state
        securities or blue sky laws.  In connection with the filings referred
        to above, the Depositor and each Trustee, solely in its or his
        capacity as Trustee of the Trust, hereby constitutes and appoints
        Daniel T. Berube, Jerry P. Pederson, Ellen M. Senechal and Robert G.
        Schuur, and each of them, as its or his true and lawful attorneys-in-
        fact and agents, with full power of substitution and resubstitution,
        for the Depositor or such Trustee or in the Depositor's or such
        Trustee's name, place and stead, in any and all capacities, to sign
        any and all amendments (including post-effective amendments) to any of
        such filings (including the 1933 Act Registration Statement) and the
        1934 Act Registration Statement and to file the same, with all
        exhibits thereto and other documents in connection therewith, with the
        Commission, the Exchange and securities or blue sky laws
        administrators, granting unto said attorneys-in-fact and agents full
        power and authority to do and perform each and every act and thing
        requisite and necessary to be done in connection therewith, as fully
        to all intents and purposes as the Depositor or such Trustee might or
        could do in person, hereby ratifying and confirming all that said
        attorneys-in-fact and agents or any of them, or their respective
        substitute or substitutes, shall do or cause to be done by virtue
        hereof.

                  5.   This Trust Agreement may be executed in one or more
        counterparts.

                  6.   The number of Trustees initially shall be three (3) and
        thereafter the number of Trustees shall be such number as shall be
        fixed from time to time by a written instrument signed by the
        Depositor which may increase or decrease the number of Trustees;
        provided, however, that to the extent required by the Business Trust
        Act, one Trustee shall be either a natural person who is a resident of
        the State of Delaware, or, if not a natural person, an entity which
        has its principal place of business in the State of Delaware and
        otherwise meets the requirements of applicable Delaware law.  Subject
        to the foregoing, the Depositor is entitled to appoint or remove
        without cause any Trustee at any time.  The Trustees may resign upon
        thirty days prior written notice to Depositor.
                  7.   The Depositor shall have the right to terminate the
        Trust at any time prior to the issuance of any Preferred Security.

                  8.   This Trust Agreement shall be governed by, and
        construed in accordance with, the laws of the State of Delaware
        (without regard to conflict of laws principles).

                  IN WITNESS WHEREOF, the parties hereto have caused this
        Trust Agreement to be duly executed as of the day and year first above
        written.


                                           THE MONTANA POWER COMPANY, 
                                                as Depositor

                                           By:______________________________
                                                Name:  
                                                Title:  


                                           THE BANK OF NEW YORK, not in its
                                                individual capacity but solely
                                                as Trustee

                                           By:_____________________________
                                                Name:  
                                                Title: 


                                           THE BANK OF NEW YORK
                                                (DELAWARE), not in its
                                                individual capacity but    
                                                 solely as Trustee


                                           By:____________________________
                                                Name:  
                                                Title: 


                                           ______________________________,
                                                Ellen M. Senechal, not in her
                                               individual capacity but solely
                                                     as Trustee