Exhibit 4(d)













                                 GUARANTEE AGREEMENT

                                       Between

                              The Montana Power Company
                                    (as Guarantor)

                                         and

                                 The Bank of New York
                                (as Guarantee Trustee)

                                     dated as of

                               _____________ ___, 199_



                                  TABLE OF CONTENTS
                                  -----------------

                                                                            Page
                                                                            ----

     ARTICLE I    DEFINITIONS  . . . . . . . . . . . . . . . . . . . . . . .   1
          SECTION 1.01 Definitions   . . . . . . . . . . . . . . . . . . . .   1

     ARTICLE II   TRUST INDENTURE ACT  . . . . . . . . . . . . . . . . . . .   4
          SECTION 2.01 Conflict With Trust Indenture Act   . . . . . . . . .   4
          SECTION 2.02 Lists of Holders of Preferred Securities  . . . . . .   4
          SECTION 2.03 Reports by the Guarantee Trustee and the
                         Guarantor . . . . . . . . . . . . . . . . . . . . .   4
          SECTION 2.04 Preferential Collection of Claims Against the
                         Guarantor . . . . . . . . . . . . . . . . . . . . .   4
          SECTION 2.05 Compliance Certificates and Opinions  . . . . . . . .   5
          SECTION 2.06 Events of Default; Waiver   . . . . . . . . . . . . .   6
          SECTION 2.07 Notice of Event of Default  . . . . . . . . . . . . .   6
          SECTION 2.08 Conflicting Interests   . . . . . . . . . . . . . . .   6

     ARTICLE III  POWERS, DUTIES, RESPONSIBILITIES AND RIGHTS OF
                  THE GUARANTEE TRUSTEE  . . . . . . . . . . . . . . . . . .   6
          SECTION 3.01 Certain Powers, Duties and Responsibilities
                         of the Guarantee Trustee  . . . . . . . . . . . . .   6
          SECTION 3.02 Certain Rights of the Guarantee Trustee   . . . . . .   7

     ARTICLE IV   GUARANTEE TRUSTEE  . . . . . . . . . . . . . . . . . . . .   9
          SECTION 4.01 Guarantee Trustee; Eligibility  . . . . . . . . . . .   9
          SECTION 4.02 Compensation and Reimbursement  . . . . . . . . . . .  10
          SECTION 4.03 Appointment, Removal and Resignation of the
                         Guarantee Trustee . . . . . . . . . . . . . . . . .  10

     ARTICLE V    GUARANTEE  . . . . . . . . . . . . . . . . . . . . . . . .  11
          SECTION 5.01 Guarantee   . . . . . . . . . . . . . . . . . . . . .  11
          SECTION 5.02 Waiver of Notice and Demand   . . . . . . . . . . . .  11
          SECTION 5.03 Obligations Not Affected  . . . . . . . . . . . . . .  12
          SECTION 5.04 Rights of Holders   . . . . . . . . . . . . . . . . .  13
          SECTION 5.05 Guarantee of Payment  . . . . . . . . . . . . . . . .  13
          SECTION 5.06 Subrogation   . . . . . . . . . . . . . . . . . . . .  13
          SECTION 5.07 Independent Obligations   . . . . . . . . . . . . . .  13

     ARTICLE VI   SUBORDINATION  . . . . . . . . . . . . . . . . . . . . . .  14
          SECTION 6.01 Subordination   . . . . . . . . . . . . . . . . . . .  14

     ARTICLE VII  TERMINATION  . . . . . . . . . . . . . . . . . . . . . . .  14
          SECTION 7.01 Termination   . . . . . . . . . . . . . . . . . . . .  14

     ARTICLE VIII      MISCELLANEOUS   . . . . . . . . . . . . . . . . . . .  14
          SECTION 8.01 Successors and Assigns  . . . . . . . . . . . . . . .  14
          SECTION 8.02 Amendments  . . . . . . . . . . . . . . . . . . . . .  15
          SECTION 8.03 Notices   . . . . . . . . . . . . . . . . . . . . . .  15
          SECTION 8.04 Benefit   . . . . . . . . . . . . . . . . . . . . . .  16
          SECTION 8.05 Interpretation  . . . . . . . . . . . . . . . . . . .  16
          SECTION 8.06 Governing Law   . . . . . . . . . . . . . . . . . . .  17


                                CROSS-REFERENCE TABLE
                                ---------------------


     Section of                                                  Section of
     Trust Indenture Act                                         Guarantee
     of 1939, as amended                                         Agreement
     -------------------                                         ---------


     310(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  4.01
     310(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  4.01, 2.08
     310(c)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     311(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.04
     311(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.04
     311(c)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     312(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.02
     312(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.02
     313 . . . . . . . . . . . . . . . . . . . . . . . . . . .  2.03
     314(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.03
     314(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     314(c)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.05
     314(d)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     314(e)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.05
     314(f)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     315(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  3.01, 3.02
     315(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.07
     315(c)  . . . . . . . . . . . . . . . . . . . . . . . . .  3.01
     315(d)  . . . . . . . . . . . . . . . . . . . . . . . . .  3.01
     316(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  5.04, 2.06
     316(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  5.03
     317(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     317(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  Inapplicable
     318(a)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.01
     318(b)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.01
     318(c)  . . . . . . . . . . . . . . . . . . . . . . . . .  2.01

     _____________
     *    This Cross-Reference Table does not constitute part of the Guarantee
          Agreement and shall not affect the interpretation of any of its terms
          or provisions.


                                 GUARANTEE AGREEMENT

               This GUARANTEE AGREEMENT ("Guarantee Agreement"), dated as of
     __________ __, 199_, is executed and delivered by The Montana Power
     Company, a Montana corporation (the "Guarantor"), and The Bank of New York,
     as trustee (the "Guarantee Trustee"), for the benefit of the Holders (as
     defined herein) from time to time of the Preferred Securities (as defined
     herein) of Montana Power Capital I, a Delaware statutory business trust
     (the "Issuer").

               WHEREAS, pursuant to an Amended and Restated Trust Agreement (the
     "Trust Agreement"), dated as of _________ __, 199__ among the Trustees of
     the Issuer named therein and The Montana Power Company, as Depositor, the
     Issuer is issuing as of the date hereof $___________ aggregate liquidation
     amount of its ___% Cumulative Quarterly Income Preferred Securities (the
     "Preferred Securities") representing preferred undivided beneficial
     ownership interests in the Issuer and having the terms set forth in the
     Trust Agreement;

               WHEREAS, the Preferred Securities are to be issued for sale by
     the Issuer and the proceeds are to be invested in $____  principal amount
     of Debentures (as defined in the Trust Agreement); and 

               WHEREAS, in order to enhance the value of the Preferred
     Securities, the Guarantor desires to irrevocably and unconditionally agree,
     to the extent set forth herein, to pay to the Holders (as defined herein)
     the Guarantee Payments (as defined herein) and to make certain other
     payments on the terms and conditions set forth herein;

               NOW, THEREFORE, in consideration of the purchase of Debentures,
     which purchase the Guarantor hereby agrees shall benefit the Guarantor, the
     Guarantor executes and delivers this Guarantee Agreement for the benefit of
     the Holders from time to time.


                                      ARTICLE I

                                     DEFINITIONS

               SECTION 1.01        DEFINITIONS.

               As used in this Guarantee Agreement, the terms set forth below
     shall, unless the context otherwise requires, have the following meanings. 
     Capitalized or otherwise defined terms used but not otherwise defined
     herein shall have the meanings assigned to such terms in the Trust
     Agreement as in effect on the date hereof.

               "Affiliate" of any specified Person means any other Person
     directly or indirectly controlling or controlled by or under direct or
     indirect common control with such specified Person.  For the purposes of
     this definition, "control" when used with respect to any specified Person
     means the power to direct the management and policies of such Person,
     directly or indirectly, whether through the ownership of voting securities,
     by contract or otherwise; and the terms "controlling" and "controlled" have
     meanings correlative to the
     foregoing.

               "Commission" means the Securities and Exchange Commission, as
     from time to time constituted, created under the Securities Exchange Act of
     1934, as amended, or, if at any time after the date of execution and
     delivery of this Guarantee Agreement such Commission is not existing and
     performing the duties now assigned to it under the Trust Indenture Act,
     then the body, if any, performing such duties at such time.

               "Common Securities" means the securities representing common
     undivided beneficial ownership interests in the assets of the Issuer.

               "Dollar" or "$" means a dollar or other equivalent unit in such
     coin or currency of the United States as at the time shall be legal tender
     for the payment of public and private debts.

               "Event of Default" means a failure by the Guarantor to perform
     any of its payment or other obligations under this Guarantee Agreement.

               "Guarantee Payments" shall mean the following payments or
     distributions, without duplication, with respect to the Preferred
     Securities, to the extent not paid or made by or on behalf of the Issuer:
     (i) any accrued and unpaid Distributions that are required to be paid on
     such Preferred Securities but only if and to the extent that the Property
     Trustee has available in the Payment Account funds sufficient to make such
     payment, (ii) the Redemption Price with respect to the Preferred Securities
     called for redemption by the Issuer but only if and to the extent that the
     Property Trustee has available in the Payment Account funds sufficient to
     make such payment, (iii) upon a voluntary or involuntary dissolution,
     winding-up or termination of the Issuer (unless Debentures are distributed
     to the Holders), the lesser of (a) the aggregate of the Liquidation Amount
     and all accrued and unpaid Distributions on the Preferred Securities to the
     date of payment, and (b) the amount of assets of the Issuer remaining
     available for distribution to Holders in liquidation of the Issuer (in
     either case, the "Liquidation Distribution").

               "Guarantee Trustee" means The Bank of New York until a Successor
     Guarantee Trustee has been appointed and has accepted such appointment
     pursuant to the terms of this Guarantee Agreement and thereafter means each
     such Successor Guarantee Trustee.

               "Guarantor Request" means a written request or order signed in
     the name of the Guarantor by an Authorized Officer and delivered to the
     Guarantee Trustee.

               "Holder" shall mean any holder, as registered on the books and
     records of the Issuer, of any Preferred Securities then outstanding;
     provided, however, that in determining whether the holders of the requisite
     percentage of Preferred Securities have given any request, notice, consent
     or waiver hereunder, "Holder" shall not include the Guarantor or any
     Affiliate of the Guarantor.

               "Indenture" means the Indenture dated as of ________ __, 199_,
     among the Guarantor (the "Debenture Issuer") and The Bank of New York, as
     trustee pursuant to which the Debentures are issued.

               "Majority in liquidation amount of the Preferred Securities"
     means a vote by Holders, voting separately as a class, of more than 50% of
     the aggregate liquidation amount of all Preferred Securities.

               "Officer's Certificate" means a certificate signed by the
     Chairman of the Board, the President, any Vice President, the Treasurer,
     any Assistant Treasurer, or any other officer or agent of the Guarantor
     duly authorized by the Board of Directors of the Guarantor to act in
     respect of matters relating to this Guarantee Agreement, delivered to the
     Guarantee Trustee.

               "Opinion of Counsel" means a written opinion of counsel, who may
     be counsel for the Guarantor, or other counsel acceptable to the Guarantee
     Trustee.

               "Person" means any individual, corporation, partnership, joint
     venture, trust, unincorporated organization or government or any agency or
     political subdivision thereof.

               "Responsible Officer" means, with respect to the Guarantee
     Trustee, any vice-president, any assistant vice-president, the secretary,
     any assistant secretary, the treasurer, any assistant treasurer, any trust
     officer or assistant trust officer or any other officer of the Corporate
     Trust Department of the Guarantee Trustee customarily performing functions
     similar to those performed by any of the above designated officers and also
     means, with respect to a particular corporate trust matter, any other
     officer to whom such matter is referred because of that officer's knowledge
     of and familiarity with the particular subject.

               "Successor Guarantee Trustee" means a successor Guarantee Trustee
     possessing the qualifications to act as Guarantee Trustee under Section
     4.01.

               "Trust Indenture Act" means the Trust Indenture Act of 1939, as
     amended.


                                      ARTICLE II

                                 TRUST INDENTURE ACT

               SECTION 2.01  CONFLICT WITH TRUST INDENTURE ACT.

               If any provision of this Guarantee Agreement limits, qualifies or
     conflicts with another provision hereof which is required or deemed to be
     included in this Guarantee Agreement by, or is otherwise governed by, any
     of the provisions of the Trust Indenture Act, such other provision shall
     control; and if any provision hereof otherwise conflicts with the Trust
     Indenture Act, the Trust Indenture Act shall control.

               SECTION 2.02  LISTS OF HOLDERS OF PREFERRED SECURITIES.

               Semiannually, not later than June 1 and December 1 in each year,
     commencing June 1, 1997, and at such other times as the Guarantee Trustee
     may request in writing, the Guarantor shall furnish or cause to be
     furnished to the Guarantee Trustee information as to the names and
     addresses of the Holders, and the Guarantee Trustee shall preserve such
     information and similar information received by it in any other capacity
     and afford to the Holders access to information so preserved by it, all to
     such extent, if any, and in such manner as shall be required by the Trust
     Indenture Act.

               SECTION 2.03  REPORTS BY THE GUARANTEE TRUSTEE AND THE GUARANTOR.

               Not later than July 31 in each year, commencing July 31, 1997,
     the Guarantee Trustee shall transmit to the Holders and the Commission a
     report, dated as of the next preceding May 31, with respect to any events
     and other matters described in Section 313(a) of the Trust Indenture Act,
     in such manner and to the extent required by the Trust Indenture Act.  The
     Guarantee Trustee shall transmit to the Holders and the Commission, and the
     Guarantor shall file with the Guarantee Trustee (within 30 days after
     filing with the Commission in the case of reports which pursuant to the
     Trust Indenture Act must be filed with the Commission and furnished to the
     Guarantee Trustee) and transmit to the Holders, such other information,
     reports and other documents, if any, at such times and in such manner, as
     shall be required by the Trust Indenture Act.

               SECTION 2.04  PREFERENTIAL COLLECTION OF CLAIMS AGAINST THE
                             GUARANTOR.

               If the Guarantee Trustee shall be or become a creditor of the
     Guarantor or any other obligor upon the Preferred Securities (other than by
     reason of a relationship described in Section 311(b) of the Trust Indenture
     Act), the Guarantee Trustee shall be subject to any and all applicable
     provisions of the Trust Indenture Act regarding the collection of claims
     against the Guarantor or such other obligor.  For purposes of Section
     311(b) of the Trust Indenture Act:

               (a)  the term "cash transaction" means any transaction in which
          full payment for goods or securities sold is made within seven days
          after delivery of the goods or securities in currency or in checks or
          other orders drawn upon banks or bankers and payable upon demand;

               (b)  the term "self-liquidating paper" means any draft, bill of
          exchange, acceptance or obligation which is made, drawn, negotiated or
          incurred by the Guarantor for the purpose of financing the purchase,
          processing, manufacturing, shipment, storage or sale of goods, wares
          or merchandise and which is secured by documents evidencing title to,
          possession of, or a lien upon, the goods, wares or merchandise or the
          receivables or proceeds arising from the sale of the goods, wares or
          merchandise previously constituting the security, provided the
          security is received by the Guarantee Trustee simultaneously with the
          creation of the creditor relationship with the Guarantor arising from
          the making, drawing, negotiating or incurring of the draft, bill of
          exchange, acceptance or obligation.

               SECTION 2.05  COMPLIANCE CERTIFICATES AND OPINIONS.

               Except as otherwise expressly provided in this Guarantee
     Agreement, upon any application or request by the Guarantor to the
     Guarantee Trustee to take any action under any provision of this Guarantee
     Agreement, the Guarantor shall, if requested by the Guarantee Trustee,
     furnish to the Guarantee Trustee an Officer's Certificate stating that all
     conditions precedent, if any, provided for in this Guarantee Agreement
     relating to the proposed action (including any covenants compliance with
     which constitutes a condition precedent) have been complied with and an
     Opinion of Counsel stating that in the opinion of such counsel all such
     conditions precedent, if any, have been complied with, except that in the
     case of any such application or request as to which the furnishing of such
     documents is specifically required by any provision of this Guarantee
     Agreement relating to such particular application or request, no additional
     certificate or opinion need be furnished.

               Every certificate or opinion with respect to compliance with a
     condition or covenant provided for in this Guarantee Agreement shall
     include:

                    (a)  a statement that each Person signing such certificate
               or opinion has read such covenant or condition and the
               definitions herein relating thereto;

                    (b)  a brief statement as to the nature and scope of the
               examination or investigation upon which the statements or
               opinions contained in such certificate or opinion are based;

                    (c)  a statement that, in the opinion of each such Person,
               such Person has made such examination or investigation as is
               necessary to enable such Person to express an informed opinion as
               to whether or not such covenant or condition has been complied
               with; and

                    (d)  a statement as to whether, in the opinion of each such
               Person, such condition or covenant has been complied with.

               SECTION 2.06  EVENTS OF DEFAULT; WAIVER.

               The Holders of a Majority in liquidation amount of the Preferred
     Securities may, by vote, on behalf of all of the Holders, waive any past
     Event of Default and its consequences.  Upon such waiver, any such Event of
     Default shall cease to exist, and any Event of Default arising therefrom
     shall be deemed to have been cured, for every purpose of this Guarantee
     Agreement, but no such waiver shall extend to any subsequent or other
     default or Event of Default or impair any right consequent thereon.

               SECTION 2.07  NOTICE OF EVENT OF DEFAULT.

               The Guarantee Trustee shall give notice of any Event of Default
     hereunder to the Holders of Preferred Securities in the manner and to the
     extent required to do so by the Trust Indenture Act, unless such Event of
     Default shall have been cured or waived.

               SECTION 2.08  CONFLICTING INTERESTS.

               If the Guarantee Trustee shall have or acquire any conflicting
     interest within the meaning of the Trust Indenture Act, it shall either
     eliminate such conflicting interest or resign to the extent, in the manner
     and with the effect, and subject to the conditions, provided in the Trust
     Indenture Act and this Guarantee Agreement.  The Trust Agreement and the
     Indenture shall be deemed to be specifically described in this Guarantee
     Agreement for the purposes of clause (i) of the first proviso contained in
     Section 310(b) of the Trust Indenture Act.


                                     ARTICLE III

                         POWERS, DUTIES, RESPONSIBILITIES AND
                           RIGHTS OF THE GUARANTEE TRUSTEE

               SECTION 3.01  CERTAIN POWERS, DUTIES AND RESPONSIBILITIES OF THE
                             GUARANTEE TRUSTEE.

               (a)  This Guarantee Agreement shall be held by the Guarantee
          Trustee for the benefit of the Holders, and the Guarantee Trustee
          shall not transfer this Guarantee Agreement or any rights hereunder to
          any Person except a Holder exercising his or her rights pursuant to
          Section 5.04 or to a Successor Guarantee Trustee on acceptance by such
          Successor Guarantee Trustee of its appointment to act as Successor
          Guarantee Trustee.  The right, title and interest of the Guarantee
          Trustee shall automatically vest in any Successor Guarantee Trustee,
          and such vesting and cessation of title shall be effective whether or
          not conveyancing documents have been executed and delivered pursuant
          to the appointment of such Successor Guarantee Trustee.

               (b)  If an Event of Default has occurred and is continuing, the
          Guarantee Trustee may in its discretion proceed to protect and enforce
          its rights and the rights of the Holders by such appropriate judicial
          proceedings as it shall deem most effectual to protect and enforce any
          such rights, whether for the specific enforcement of any covenant or
          agreement in this Guaranty Agreement or in aid of the exercise of any
          power granted herein, or to enforce any other proper remedy.

               (c)  The Guarantee Trustee shall have and be subject to all the
          duties and responsibilities specified with respect to an indenture
          trustee in the Trust Indenture Act and no implied covenants or
          obligations shall be read into this Guarantee Agreement against the
          Guarantee Trustee.

               (d)  No provision of this Guarantee Agreement shall require the
          Guarantee Trustee to expend or risk its own funds or otherwise incur
          any financial liability in the performance of any of its duties
          hereunder, or in the exercise of any of its rights or powers, if it
          shall have reasonable grounds for believing that repayment of such
          funds or adequate indemnity against such risk or liability is not
          reasonably assured to it.

               (e)  Notwithstanding anything contained in this Guarantee
          Agreement to the contrary, the duties and responsibilities of the
          Guarantee Trustee under this Guarantee Agreement shall be subject to
          the protections, exculpations and limitations on liability afforded to
          the Guarantee Trustee under this Guarantee Agreement and the Trust
          Indenture Act, including those deemed by the Trust Indenture Act to be
          included herein.

               (f)  Whether or not therein expressly so provided, every
          provision of this Guarantee Agreement relating to the conduct or
          affecting the liability of or affording protection to the Trustee
          shall be subject to the provisions of this Section.

               SECTION 3.02  CERTAIN RIGHTS OF THE GUARANTEE TRUSTEE.

               Subject to the provisions of Section 3.01 and to the applicable
     provisions of the Trust Indenture Act:

               (a)  the Guarantee Trustee may rely and shall be protected in
          acting or refraining from acting in good faith upon any resolution,
          certificate, statement, instrument, opinion, report, notice, request,
          direction, consent, order, bond, debenture, note, other evidence of
          indebtedness or other paper or document reasonably believed by it to
          be genuine and to have been signed or presented by the proper party or
          parties;

               (b)  any request or direction of the Guarantor shall be
          sufficiently evidenced by a Guarantor Request, or as otherwise
          expressly provided herein, and any resolution of the Board of
          Directors may be sufficiently evidenced by a Board Resolution;

               (c)  whenever in the administration of this Guarantee Agreement
          the Guarantee Trustee shall deem it desirable that a matter be proved
          or established prior to taking, suffering or omitting any action
          hereunder, the Guarantee Trustee (unless other evidence be herein
          specifically prescribed) may, in the absence of bad faith on its part,
          rely upon an Officer's Certificate;

               (d)  the Guarantee Trustee may consult with counsel and the
          written advice of such counsel or any Opinion of Counsel shall be full
          and complete authorization and protection in respect of any action
          taken, suffered or omitted by it hereunder in good faith and in
          reliance thereon;

               (e)  the Guarantee Trustee shall be under no obligation to
          exercise any of the rights or powers vested in it by this Guarantee
          Agreement at the request or direction of any Holder pursuant to this
          Guarantee Agreement, unless such Holder shall have offered to the
          Guarantee Trustee reasonable security or indemnity against the costs,
          expenses and liabilities which might be incurred by it in compliance
          with such request or direction;

               (f)  the Guarantee Trustee shall not be bound to make any
          investigation into the facts or matters stated in any resolution,
          certificate, statement, instrument, opinion, report, notice, request,
          direction, consent, order, bond, debenture, note, other evidence of
          indebtedness or other paper or document, but the Guarantee Trustee, in
          its discretion, may make such further inquiry or investigation into
          such facts or matters as it may see fit, and, if the Guarantee Trustee
          shall determine to make such further inquiry or investigation, it
          shall (subject to applicable legal requirements) be entitled to
          examine, during normal business hours, the books, records and premises
          of the Guarantor, personally or by agent or attorney;

               (g)  the Guarantee Trustee may execute any of the trusts or
          powers hereunder or perform any duties hereunder either directly or by
          or through agents or attorneys and the Guarantee Trustee shall not be
          responsible for any misconduct or negligence on the part of any agent
          or attorney appointed with due care by it hereunder;

               (h)  the Guarantee Trustee shall not be charged with knowledge of
          any Event of Default unless either (1) a Responsible Officer of the
          Trustee shall have actual knowledge of the Event of Default or (2)
          written notice of such Event of Default shall have been given to the
          Guarantee Trustee by the Guarantor, any other obligor on the Preferred
          Securities or by any Holder of the Preferred Securities; and 

               (i)  no provision of this Guarantee Agreement shall be deemed to
          impose any duty or obligation on the Guarantee Trustee to perform any
          act or acts or exercise any right, power, duty or obligation conferred
          or imposed on it in any jurisdiction in which it shall be illegal, or
          in which the Guarantee Trustee shall be unqualified or incompetent in
          accordance with applicable law, to perform any such act or acts or to
          exercise any such right, power, duty or obligation.


                                      ARTICLE IV

                                  GUARANTEE TRUSTEE

               SECTION 4.01  GUARANTEE TRUSTEE; ELIGIBILITY.

               There shall at all times be a Guarantee Trustee hereunder which
     shall be

                  (a)  a corporation organized and doing business under the laws
             of the United States, any State or Territory thereof or the
             District of Columbia, authorized under such laws to exercise
             corporate trust powers, having a combined capital and surplus of at
             least $50,000,000 and subject to supervision or examination by
             Federal or State authority, or

                  (b)  if and to the extent permitted by the Commission by rule,
             regulation or order upon application, a corporation or other Person
             organized and doing business under the laws of a foreign
             government, authorized under such laws to exercise corporate trust
             powers, having a combined capital and surplus of at least
             $50,000,000 or the Dollar equivalent of the applicable foreign
             currency and subject to supervision or examination by authority of
             such foreign government or a political subdivision thereof
             substantially equivalent to supervision or examination applicable
             to United States institutional trustees,

     and, in either case, qualified and eligible under this Article and the
     Trust Indenture Act.  If such corporation publishes reports of condition at
     least annually, pursuant to law or to the requirements of such supervising
     or examining authority, then for the purposes of this Section, the combined
     capital and surplus of such corporation shall be deemed to be its combined
     capital and surplus as set forth in its most recent report of condition so
     published.  If at any time the Trustee shall cease to be eligible in
     accordance with the provisions of this Section, it shall resign immediately
     in the manner and with the effect hereinafter specified in this Article.


               SECTION 4.02  COMPENSATION AND REIMBURSEMENT.

               The Guarantor agrees:

               (a)  to pay the Guarantee Trustee from time to time such
     reasonable compensation as the Guarantor and the Guarantee Trustee shall
     from time to time agree in writing for all services rendered by it
     hereunder (which compensation shall not be limited by any provision of law
     in regard to the compensation of a trustee of an express trust);

               (b)  except as otherwise expressly provided herein, to reimburse
     the Guarantee Trustee upon its request for all reasonable expenses,
     disbursements and advances incurred or made by the Guarantee Trustee in
     accordance with the provisions of this Guarantee (including the reasonable
     compensation and expenses of its agents and counsel), except any such
     expense, disbursement or advance as may be attributable to its negligence
     or bad faith; and

               (c)  to indemnify each of the Guarantee Trustee and any
     predecessor Guarantee Trustee for, and to hold it harmless from and
     against, any and all loss, damage, claim, liability or expense, including
     taxes (other than taxes based upon the income of the Guarantee Trustee)
     incurred without negligence or bad faith on its part, arising out of or in
     connection with the acceptance of the trust created by, or the
     administration of, this Guarantee Agreement, including the costs and
     expenses of defending itself against any claim or liability in connection
     with the exercise or performance of any of its powers or duties hereunder.

               As security for the performance of the obligations of the
     Guarantor under this Section, the Guarantee Trustee shall have a lien prior
     to the Preferred Securities upon all the property and funds held or
     collected by the Guarantee Trustee as such, except funds held in trust for
     the payment of principal of, and premium (if any) or interest on,
     particular obligations of the Guarantor under this Guarantee Agreement.

               The provisions of this Section shall survive the termination of
     this Guarantee Agreement.

               SECTION 4.03  APPOINTMENT, REMOVAL AND RESIGNATION OF THE
                             GUARANTEE TRUSTEE.

               (a)  Subject to Section 4.03(b), unless an Event of Default shall
     have occurred and be continuing, the Guarantee Trustee may be appointed or
     removed without cause at any time by the Guarantor.

               (b)  The Guarantee Trustee shall not be removed until a Successor
     Guarantee Trustee has been appointed and has accepted such appointment by
     written instrument executed by such Successor Guarantee Trustee and
     delivered to the Guarantor.

               (c)  The Guarantee Trustee appointed to office shall hold office
     until a Successor Guarantee Trustee shall have been appointed or until its
     removal or resignation.  The Guarantee Trustee may resign from office
     (without need for prior or subsequent accounting) by an instrument in
     writing executed by the Guarantee Trustee and delivered to the Guarantor,
     which resignation shall not take effect until a Successor Guarantee Trustee
     has been appointed and has accepted such appointment by instrument in
     writing executed by such Successor Guarantee Trustee and delivered to the
     Guarantor and the resigning Guarantee Trustee.

               (d)  If no Successor Guarantee Trustee shall have been appointed
     and accepted appointment as provided in this Section 4.03 within 60 days
     after delivery to the Guarantor of an instrument of resignation, the
     resigning Guarantee Trustee may petition any court of competent
     jurisdiction for appointment of a Successor Guarantee Trustee.  Such court
     may thereupon, after prescribing such notice, if any, as it may deem
     proper, appoint a Successor Guarantee Trustee.

               (e)  The Guarantor shall give notice of each resignation and each
     removal of the Guarantee Trustee and each appointment of a successor
     Guarantee Trustee to all Holders in the manner provided in Section 8.03
     hereof.  Each notice shall include the name of the successor Guarantee
     Trustee and the address of its Corporate Trust Office.


                                      ARTICLE V

                                      GUARANTEE

               SECTION 5.01  GUARANTEE.

               The Guarantor irrevocably and unconditionally agrees to pay in
     full to the Holders the Guarantee Payments (without duplication of amounts
     theretofore paid by the Issuer), as and when due, regardless of any
     defense, right of set-off or counterclaim which the Issuer may have or
     assert.  The Guarantor's obligation to make a Guarantee Payment may be
     satisfied by direct payment of the required amounts by the Guarantor to the
     Holders or by causing the Issuer to pay such amounts to the Holders.

               SECTION 5.02  WAIVER OF NOTICE AND DEMAND.

               The Guarantor hereby waives notice of acceptance of this
     Guarantee Agreement and of any liability to which it applies or may apply,
     presentment, demand for payment, any right to require a proceeding first
     against the Issuer or any other Person before proceeding against the
     Guarantor, protest, notice of nonpayment, notice of dishonor, notice of
     redemption and all other notices and demands.

               SECTION 5.03  OBLIGATIONS NOT AFFECTED.

               The obligations, covenants, agreements and duties of the
     Guarantor under this Guarantee Agreement shall in no way be affected or
     impaired by reason of the happening from time to time of any of the
     following:

               (a)  the release or waiver, by operation of law or otherwise, of
          the performance or observance by the Issuer of any express or implied
          agreement, covenant, term or condition relating to the Preferred
          Securities to be performed or observed by the Issuer;

               (b)  the extension of time for the payment by the Issuer of all
          or any portion of the Distributions, Redemption Price, Liquidation
          Distribution or any other sums payable under the terms of the
          Preferred Securities or the extension of time for the performance of
          any other obligation under, arising out of, or in connection with, the
          Preferred Securities (other than an extension of time for payment of
          Distributions, Redemption Price, Liquidation Distribution or other sum
          payable that results from the extension of any interest payment period
          on the Debentures permitted by the Indenture);

               (c)  any failure, omission, delay or lack of diligence on the
          part of the Holders to enforce, assert or exercise any right,
          privilege, power or remedy conferred on the Holders pursuant to the
          terms of the Preferred Securities, or any action on the part of the
          Issuer granting indulgence or extension of any kind;

               (d)  the voluntary or involuntary liquidation, dissolution, sale
          of any collateral, receivership, insolvency, bankruptcy, assignment
          for the benefit of creditors, reorganization, arrangement, composition
          or readjustment of debt of, or other similar proceedings affecting,
          the Issuer or any of the assets of the Issuer;

               (e)  any invalidity of, or defect or deficiency in, the Preferred
          Securities;

               (f)  the settlement or compromise of any obligation guaranteed
          hereby or hereby incurred; or 

               (g)  any other circumstance whatsoever that might otherwise
          constitute a legal or equitable discharge or defense of a guarantor,
          it being the intent of this Section 5.03 that the obligations of the
          Guarantor hereunder shall be absolute and unconditional under any and
          all circumstances.

     There shall be no obligation of the Holders to give notice to, or obtain
     consent of, the Guarantor with respect to the happening of any of the
     foregoing.


               SECTION 5.04        RIGHTS OF HOLDERS.

               The Guarantor expressly acknowledges that: (i) this Guarantee
     Agreement will be deposited with the Guarantee Trustee to be held for the
     benefit of the Holders; (ii) if an Event of Default has occurred and is
     continuing, the Guarantee Trustee has the right to enforce this Guarantee
     Agreement on behalf of the Holders; (iii) the Holders of a Majority in
     liquidation amount of the 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 this Guarantee Agreement
     or exercising any trust or power conferred upon the Guarantee Trustee under
     this Guarantee Agreement; and (iv) any Holder may institute a legal
     proceeding directly against the Guarantor to enforce its rights under this
     Guarantee Agreement without first instituting a legal proceeding against
     the Issuer or any other person or entity.

               SECTION 5.05        GUARANTEE OF PAYMENT.

               This Guarantee Agreement creates a guarantee of payment and not
     of collection.  This Guarantee Agreement will not be discharged except by
     payment of the Guarantee Payments in full (without duplication).

               SECTION 5.06        SUBROGATION.

               The Guarantor shall be subrogated to all (if any) rights of the
     Holders against the Issuer in respect of any amounts paid to the Holders by
     the Guarantor under this Guarantee Agreement; provided, however, that the
     Guarantor shall not (except to the extent required by mandatory provisions
     of law) be entitled to enforce or exercise any rights which it may acquire
     by way of subrogation or any indemnity, reimbursement or other agreement,
     in all cases as a result of payment under this Guarantee Agreement, if, at
     the time of any such payment, any amounts of Guarantee Payments are due and
     unpaid under this Guarantee Agreement.  If any amount shall be paid to the
     Guarantor in violation of the preceding sentence, the Guarantor agrees to
     hold such amount in trust for the Holders and to pay over such amount to
     the Holders.

               SECTION 5.07  INDEPENDENT OBLIGATIONS.

               The Guarantor acknowledges that its obligations hereunder are
     independent of the obligations of the Issuer with respect to the Preferred
     Securities and that the Guarantor shall be liable as principal and as
     debtor hereunder to make Guarantee Payments pursuant to the terms of this
     Guarantee Agreement notwithstanding the occurrence of any event referred to
     in subsections (a) through (g), inclusive, of Section 5.03.



                                      ARTICLE VI

                                    SUBORDINATION

               SECTION 6.01  SUBORDINATION.

               This Guarantee Agreement will constitute an unsecured obligation
     of the Guarantor and will rank subordinate and junior in right of payment
     to all Senior Indebtedness (as defined in the Indenture) of the Guarantor
     to the same extent as the Debentures.  Nothing in this Section 6.01 shall
     apply to claims of, or payments to, the Guarantee Trustee under or pursuant
     to Section 4.02 hereof.


                                     ARTICLE VII

                                     TERMINATION

               SECTION 7.01  TERMINATION.

               This Guarantee Agreement shall terminate and be of no further
     force and effect upon: (i) full payment of the Redemption Price of all
     Preferred Securities, and all accrued and unpaid Distributions to the date
     of redemption, (ii) the distribution of Debentures to Holders in exchange
     for all of the Preferred Securities or (iii) full payment of the amounts
     payable in accordance with the Trust Agreement upon liquidation of the
     Issuer.  Notwithstanding the foregoing, this Guarantee Agreement will
     continue to be effective or will be reinstated, as the case may be, if at
     any time any Holder must restore payment of any sums paid with respect to
     Preferred Securities or under this Guarantee Agreement.


                                     ARTICLE VIII

                                    MISCELLANEOUS

               SECTION 8.01  SUCCESSORS AND ASSIGNS.

               All guarantees and agreements contained in this Guarantee
     Agreement shall bind the successors, assigns, receivers, trustees and
     representatives of the Guarantor and shall inure to the benefit of the
     Holders of the Preferred Securities then outstanding.  Except in connection
     with a consolidation, merger or sale involving the Guarantor that is
     permitted under Article Eleven of the Indenture, the Guarantor shall not
     assign its obligations hereunder.


               SECTION 8.02  AMENDMENTS.

               This Guarantee Agreement may be amended only by an instrument in
     writing entered into by the Guarantor and the Guarantee Trustee.  Except
     with respect to any changes which do not adversely affect the rights of
     Holders (in which case no consent of Holders will be required), this
     Guarantee Agreement may only be amended with the prior approval of the
     Holders of not less than 66 2/3% in aggregate liquidation amount of all the
     outstanding Preferred Securities.  The provisions of Article VI of the
     Trust Agreement concerning meetings of Holders shall apply to the giving of
     such approval.  Nothing herein contained shall be deemed to require that
     the Guarantee Trustee enter into any amendment of this Guarantee Agreement.

               SECTION 8.03  NOTICES.

               Any notice, request or other communication required or permitted
     to be given hereunder shall be in writing, duly signed by the party giving
     such notice, and delivered, telecopied or mailed by first class mail as
     follows:

               (a)  if given to the Guarantor, to the address set forth below or
          such other address as the Guarantor may give notice of to the Holders
          of the Preferred Securities:

                         The Montana Power Company
                         40 East Broadway
                         Butte, Montana 59701-9989
                         Facsimile No:  (406) 497-2374
                         Attention:  Treasurer

               (b)  if given to the Issuer, in care of the Administrative
          Trustees, at the Issuer's (and the Administrative Trustee's) address
          set forth below or such other address as the Administrative Trustees
          on behalf of the Issuer may give notice of to the Holders:

                         Montana Power Capital I
                         c/o The Montana Power Company
                         40 East Broadway
                         Butte, Montana 59701-9989
                         Facsimile No:  (406) 497-3018
                         Attention:  Administrative Trustees

               (c)  if given to the Guarantee Trustee, to the address set forth
          below or such other address as the Guarantee Trustee may give notice
          of to the Holders of the Preferred Securities:

                         The Bank of New York
                         101 Barclay Street
                         21 West
                         New York, New York 10286
                         Facsimile No: (212) 815-5915
                         Attention: Corporate Trust Administration

               (d)  if given to any Holder, at the address set forth on the
          books and records of the Issuer.

               All notices hereunder shall be deemed to have been given when
     received in person, telecopied with receipt confirmed, or mailed by first
     class mail, postage prepaid except that if a notice or other document is
     refused delivery or cannot be delivered because of a changed address of
     which no notice was given, such notice or other document shall be deemed to
     have been delivered on the date of such refusal or inability to deliver.

               SECTION 8.04  BENEFIT.

               This Guarantee Agreement is solely for the benefit of the Holders
     and, subject to Section 3.01(a), is not separately transferable from the
     Preferred Securities.

               SECTION 8.05  INTERPRETATION.

               In this Guarantee Agreement, unless the context otherwise
     requires:

               (a)  a term defined anywhere in this Guarantee Agreement has the
          same meaning throughout;

               (b)  all references to "the Guarantee Agreement" or "this
          Guarantee Agreement" are to this Guarantee Agreement as modified,
          supplemented or amended from time to time;

               (c)  all references in this Guarantee Agreement to Articles and
          Sections are to Articles and Sections of this Guarantee Agreement
          unless otherwise specified;

               (d)  a term defined in the Trust Indenture Act has the same
          meaning when used in this Guarantee Agreement unless otherwise defined
          in this Guarantee Agreement or unless the context otherwise requires;

               (e)  a reference to the singular includes the plural and vice
          versa; and

               (f)  the masculine, feminine or neuter genders used herein shall
          include the masculine, feminine and neuter genders.

               SECTION 8.06  GOVERNING LAW.

               THIS GUARANTEE AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED AND
     INTERPRETED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

               This instrument may be executed in any number of counterparts,
     each of which so executed shall be deemed to be an original, but all such
     counterparts shall together constitute but one and the same instrument.


               THIS GUARANTEE AGREEMENT is executed as of the day and year first
     above written.

                                        The Montana Power Company

                                        By: ___________________________________
                                           Name:
                                           Title:


                                        The Bank of New York,
                                         as Guarantee Trustee

                                        By: __________________________________
                                           Name:
                                           Title: