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                            BOND COLLATERAL AGREEMENT


                                     between


                            NORTHWESTERN CORPORATION


                                       and


                           CREDIT SUISSE FIRST BOSTON,
                    acting through its Cayman Islands Branch,
                               as Collateral Agent






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                          Dated as of February 10, 2003

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


                                                                                  
ARTICLE I DEFINITIONS.................................................................1

    SECTION 1.1 Defined Terms.........................................................1
    SECTION 1.2 Additional Terms......................................................1

ARTICLE II COLLATERAL FIRST MORTGAGE BONDS............................................3

    SECTION 2.1 Form; Issuance and Delivery...........................................3
    SECTION 2.2 Property of Collateral Agent..........................................4
    SECTION 2.3 Loans and Collateral First Mortgage Bonds Constitute Same
                      Indebtedness Unless and Until Remedy Exercise Day Occurs;
                      Application of Payments.........................................4
    SECTION 2.4 Transfer Provisions and Restrictions..................................5
    SECTION 2.5 Registration Rights and Related Matters...............................5
    SECTION 2.6 Private Sales.........................................................7

ARTICLE III REPRESENTATIONS, WARRANTIES AND  COVENANTS OF THE COMPANY.................7

    SECTION 3.1 Name and Jurisdiction of Organization.................................7
    SECTION 3.2 Collateral First Mortgage Bonds; Related Matters......................7
    SECTION 3.3 Other Consents........................................................8
    SECTION 3.4 Change of Name, Jurisdiction of Organization or Location of Place of
                      Business........................................................8
    SECTION 3.5 Further Assurances....................................................8
    SECTION 3.6 Filing; No Further Security Interest..................................9
    SECTION 3.7 Filing or Recording of Supplemental Indentures........................9
    SECTION 3.8 Delivery of Notices...................................................9

ARTICLE IV RIGHT TO DISPOSE OF COLLATERAL FIRST MORTGAGE BONDS........................9

    SECTION 4.1 Right to Dispose of Collateral First Mortgage Bonds...................9
    SECTION 4.2 Reservation of Other Rights..........................................10
    SECTION 4.3 Subsequent Dispositions..............................................10

ARTICLE V COLLATERAL AGENT AND LENDERS...............................................10

    SECTION 5.1 Authority and Duties of Collateral Agent.............................10
    SECTION 5.2 Successor Collateral Agent...........................................11
    SECTION 5.3 Protections of Collateral Agent......................................11
    SECTION 5.4 Applicable Share Certificates........................................11
    SECTION 5.5 Private Placement Representations....................................11

ARTICLE VI MISCELLANEOUS.............................................................12

    SECTION 6.1 Indemnification, Expenses, Etc.......................................12
    SECTION 6.2 Obligations Absolute.................................................13




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                                TABLE OF CONTENTS
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    SECTION 6.3 Remedies Cumulative; Delay Not Waiver................................13
    SECTION 6.4 Termination..........................................................14
    SECTION 6.5 Taxes 14
    SECTION 6.6 Amendments, Etc......................................................15
    SECTION 6.7 Address for Notices..................................................15
    SECTION 6.8 Severability.........................................................15
    SECTION 6.9 Survival of Provisions...............................................15
    SECTION 6.10 Binding Agreement...................................................15
    SECTION 6.11 Headings............................................................15
    SECTION 6.12 GOVERNING LAW.......................................................15
    SECTION 6.13 WAIVER OF JURY TRIAL; SUBMISSION TO JURISDICTION....................16
    SECTION 6.14 Third Party Rights..................................................16
    SECTION 6.15 Integration.........................................................16
    SECTION 6.16 Execution in Counterparts...........................................16
    SECTION 6.17 Conflict with Other Documents.......................................16




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               BOND  COLLATERAL  AGREEMENT,  dated as of February 10, 2003 (this
"Agreement"), between NORTHWESTERN CORPORATION, a corporation duly organized and
validly  existing under the laws of the State of Delaware (the  "Company"),  and
CREDIT  SUISSE  FIRST  BOSTON,  acting  through its Cayman  Islands  Branch,  as
collateral agent (together with its successors and assigns in such capacity, the
"Collateral Agent") for the benefit of the Lenders (as defined below).

                              W I T N E S S E T H:
                               -------------------

               WHEREAS, the Company has entered into the Credit Agreement, dated
as of  December  17,  2002 (as  amended,  restated,  supplemented  or  otherwise
modified  from  time to  time,  the  "Credit  Agreement"),  with  the  financial
institutions   from  time  to  time  parties  thereto  (each,  a  "Lender"  and,
collectively,  the "Lenders") and Credit Suisse First Boston, acting through its
Cayman  Islands   Branch,   as   Administrative   Agent  for  the  Lenders  (the
"Administrative Agent");

               WHEREAS,  pursuant  to the Credit  Agreement,  the  Lenders  have
agreed to make Loans to the Company, in accordance with the terms and conditions
set forth  therein  and,  pursuant  to Article 8 of the Credit  Agreement,  have
designated and appointed  Credit Suisse First Boston,  acting through its Cayman
Islands Branch, as Collateral Agent; and

               WHEREAS,  as  conditions  to the  making of the  Loans  under the
Credit  Agreement,  the  Company  is  required  (i) to issue and  deliver to the
Collateral Agent, as security for the Obligations, the Collateral First Mortgage
Bonds (such terms and all other capitalized terms used in these recitals but not
defined in these  recitals  having the meanings  stated or ascribed in Article I
hereof), and (ii) to execute and deliver this Agreement.

                                A G R E E M E N T
                                -----------------

               NOW, THEREFORE, in consideration of the foregoing,  and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:



                                    ARTICLE I

                                   DEFINITIONS

               SECTION 1.1 Defined  Terms.  For all purposes of this  Agreement,
capitalized terms not otherwise defined herein shall have the meanings set forth
in  the  Credit  Agreement  or the  Collateral  First  Mortgage  Bonds  (or  the
Supplemental Indentures relating thereto).

               SECTION 1.2 Additional  Terms.  In addition,  the following terms
have the meaning hereafter specified:






               "Acceleration   Day"  means  the  day  on  which  the  Loans  are
        accelerated in accordance with the Credit Agreement.

               "Administrative  Agent" has the meaning  given in the recitals to
        this Agreement.

               "Agreement" has the meaning given in the  introductory  paragraph
        to this Agreement.

               "Collateral  Agent"  has the  meaning  given in the  introductory
        paragraph to this Agreement.

               "Collateral  First  Mortgage  Bonds"  means,  collectively,   the
        Montana First Mortgage Bonds and the South Dakota First Mortgage Bonds.

               "Collateral  First  Mortgage  Bondowner  Rights"  has the meaning
        given in Section 2.2 of this Agreement.

               "Company" has the meaning given in the introductory  paragraph to
        this Agreement.

               "Credit  Agreement" has the meaning given in the recitals to this
        Agreement.

               "Indentures"  means,  collectively,  the Montana  First  Mortgage
        Indenture and the South Dakota First Mortgage Indenture.

               "Lenders"   has  the  meaning  given  in  the  recitals  to  this
        Agreement.

               "Montana  First Mortgage  Bonds" means the First Mortgage  Bonds,
        Credit Agreement (2002) Series,  due 2006,  authenticated  and delivered
        under the Montana First Mortgage Indenture.

               "Montana First Mortgage Indenture" means the Mortgage and Deed of
        Trust  dated as of  October  1,  1945  from the  Company  (as  successor
        thereunder to NorthWestern Energy,  L.L.C., in turn successor thereunder
        to  The  Montana  Power  Company)  to the  trustees  named  therein,  as
        supplemented  and  amended,   including  by  the  Montana   Supplemental
        Indenture.

               "Montana   Supplemental   Indenture"   means   the   Twenty-third
        Supplemental  Indenture,  dated as of February  1, 2003,  to the Montana
        First Mortgage  Indenture  amending and  supplementing  the same,  among
        other things, to provide for the issuance and terms of the Montana First
        Mortgage Bonds.

               "Obligations"  means the unpaid  principal of and interest on the
        Loans  (including,  without  limitation,  interest  accruing  after  the
        maturity  of the  Loans,  interest  accruing  after  the  filing  of any
        petition  in  bankruptcy,   or  the   commencement  of  any  insolvency,
        reorganization or like proceeding, relating to


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        the Company,  whether or not a claim for  post-filing  or  post-petition
        interest is allowed in such proceeding  and, to the extent  permitted by
        law,  interest  on  interest)  payable  in  accordance  with the  Credit
        Agreement (and, if applicable, evidenced by the Notes).

               "Permitted  Sale" has the meaning given in Section 2.5(b) of this
        Agreement.

               "Remedy Exercise Day" means the day (on or after the Acceleration
        Day) on  which  all  (but not less  than  all) of the  Collateral  First
        Mortgage Bonds are  transferred  by the Collateral  Agent to or upon the
        order of the Lenders in full satisfaction and discharge of the Loans and
        Obligations pursuant to Section 4.1 hereof.

               "Securities  Act" has the meaning given in Section 2.5(b) of this
        Agreement.

               "Security  Interest"  means  the  security  interest  granted  or
        purported to be granted by the Company pursuant to the final sentence of
        Section 2.2 of this Agreement.

               "South Dakota First Mortgage Bonds" means the New Mortgage Bonds,
        Credit Agreement (2002) Series,  due 2006,  authenticated  and delivered
        under the South Dakota First Mortgage Indenture.

               "South  Dakota  First  Mortgage   Indenture"  means  the  General
        Mortgage  Indenture and Deed of Trust dated as of August 1, 1993 between
        the  Company  and  The  Chase  Manhattan  Bank  (National   Association)
        (JPMorgan Chase Bank, as successor),  as trustee,  as  supplemented  and
        amended, including by the South Dakota Supplemental Indenture.

               "South  Dakota  Supplemental  Indenture"  means the  Supplemental
        Indenture,  dated as of  February  1, 2003,  to the South  Dakota  First
        Mortgage  Indenture  amending and  supplementing  the same,  among other
        things,  to provide for the issuance and terms of the South Dakota First
        Mortgage Bonds.

               "Supplemental  Indentures"  means,   collectively,   the  Montana
        Supplemental Indenture and the South Dakota Supplemental Indenture.



                                   ARTICLE II

                         COLLATERAL FIRST MORTGAGE BONDS


               SECTION 2.1 Form;  Issuance  and  Delivery.  (a) Each  Collateral
First Mortgage Bond shall be in substantially  the form set forth in or attached
as an exhibit to the  relevant  Supplemental  Indenture,  in each case with such
appropriate  insertions,


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omissions,  substitutions  and other  variations as are required or permitted by
the relevant  Indenture  and the Credit  Agreement,  and may have such  letters,
numbers or other marks of identification and such legends or endorsements placed
thereon  as may be  required  to  comply  with  applicable  law or the terms and
provisions of the relevant Indenture.

      (a) Simultaneously with the execution and delivery of this Agreement,  the
Company  shall issue and  deliver the  Collateral  First  Mortgage  Bonds to the
Collateral  Agent for the ratable  benefit of the  Lenders,  as security for the
prompt  and full  payment  by the  Company  of,  and to  further  evidence,  the
Obligations. The Collateral First Mortgage Bonds shall be registered in the name
of the  Collateral  Agent  and  shall be held by the  Collateral  Agent  for the
ratable benefit of the Lenders.

               SECTION 2.2  Property of  Collateral  Agent.  Upon  issuance  and
delivery to the Collateral Agent of the Collateral First Mortgage Bonds: (i) the
Company  shall not be, or be deemed  to be,  the owner of the  Collateral  First
Mortgage  Bonds;  (ii) the  Company  shall not have,  and shall not be deemed to
have, any right, title or interest in, to or under the Collateral First Mortgage
Bonds  (other than as the payor and obligor  thereunder);  (iii) the  Collateral
Agent (or any transferee in accordance with the terms hereof) shall be and shall
have all of the rights and  interests of a registered  owner of each  Collateral
First Mortgage Bond under the Indenture  relating  thereto,  including,  without
limitation,  (x) the right to vote, consent or take any other action (including,
without  limitation,  to issue  instructions and make requests for action) which
may be taken by a registered  owner of such Collateral First Mortgage Bond under
such  Indenture,  and (y) the  right to  collect  all  amounts  payable  to such
registered  owner under such Indenture (all such rights described in this clause
(iii)  being  referred  to,  collectively,  as the  "Collateral  First  Mortgage
Bondowner  Rights");  and (iv) the Collateral  First Mortgage Bonds shall not be
considered the property of the Company or the Company's  estate in the event the
Company  becomes  the subject of a  proceeding  or action  under any  applicable
domestic or foreign bankruptcy,  insolvency,  reorganization or similar law. If,
notwithstanding  the  foregoing,  the Company shall be deemed to have any right,
title or interest in, to or under any Collateral First Mortgage Bond (other than
as the payor and obligor  thereunder),  the Company  hereby  pledges such right,
title and interest (and all proceeds  thereof) to the  Collateral  Agent for the
ratable  benefit of the  Lenders and hereby  grants a security  interest in such
right, title and interest (and all proceeds thereof) to the Collateral Agent for
the  ratable  benefit  of the  Lenders,  in  each  case,  as  security  for  the
Obligations.

               SECTION 2.3 Loans and Collateral  First Mortgage Bonds Constitute
Same  Indebtedness  Unless and Until Remedy Exercise Day Occurs;  Application of
Payments.  At all times prior to the Remedy  Exercise  Day (and by reason of the
terms and provisions of the Collateral First Mortgage Bonds and the Supplemental
Indentures,  including, without limitation, the principal of and interest on the
Collateral  First Mortgage Bonds being  determined by reference to the principal
of and interest on the Loans and the  satisfaction of obligations of the Company
to make payments of principal of and interest on the  Collateral  First Mortgage
Bonds  which  results  from  payments  made by the Company of  principal  of and
interest on the Loans),  the Loans and the Collateral First Mortgage Bonds shall
be and constitute the same indebtedness of the Company and, in respect of all of
the Loans and all of the Collateral  First Mortgage Bonds, the


                                       4



Company  shall  not  be  obligated  to  make  principal   payments  that  exceed
$390,000,000  in the  aggregate  (or to pay interest on a principal  amount that
exceeds  $390,000,000  in the  aggregate).  If, at any time  prior to the Remedy
Exercise Day, the Collateral Agent receives  payments or other  distributions of
moneys under an Indenture and, in accordance with such Indenture,  such payments
or other  distributions  are to be  applied or to be deemed to be applied to the
payment or reduction of the principal of or the interest on the Collateral First
Mortgage Bonds issued under such  Indenture,  there shall be deemed to have been
paid or reduced  an equal  amount of the  principal  of or the  interest  on the
Loans.  If (but only if) the Remedy  Exercise Day shall have occurred,  then, on
and as of the Remedy Exercise Day, (i) the Loans and Obligations shall be deemed
satisfied and discharged in full in accordance  with Section 4.1 hereof (without
any  further  liability  on the  part of the  Company  therefor),  and  (ii) the
Collateral  First  Mortgage  Bonds shall  constitute  separate  and  independent
indebtedness of the Company  governed by the terms thereof and of the Indentures
(without any further reference to the Credit Agreement).

               SECTION 2.4 Transfer  Provisions and Restrictions.  (a) The Loans
(as  evidenced by the Notes) may be assigned  (and thereby  transferred)  by the
Lenders to Assignees subject to and in accordance with Section 9.6 of the Credit
Agreement.  Following any such  assignment  to an Assignee,  such Assignee (as a
Lender)  shall be entitled to the  benefits  afforded  by the  Collateral  First
Mortgage  Bonds  to the  Loans so  assigned  on the  terms  and  subject  to the
conditions  of this  Agreement  (but shall not be entitled,  by virtue solely of
such assignment, to the transfer of any portion of the Collateral First Mortgage
Bonds to such Assignee).

      (b) The Collateral Agent hereby  expressly  acknowledges and agrees to the
restrictions on transfer of the Collateral First Mortgage Bonds contained in the
Collateral First Mortgage Bonds and the Supplemental Indentures.  The Collateral
Agent hereby further agrees that, except for (i) any transfer in accordance with
such  restrictions on transfer,  or (ii) in connection with the surrender of the
Collateral  First Mortgage Bonds pursuant to Section 6.4 hereof,  the Collateral
Agent shall not sell, assign,  transfer,  pledge, mortgage or otherwise encumber
or dispose of any Collateral First Mortgage Bond or any interest  therein;  and,
subject to such  exceptions,  the  Collateral  Agent (or a  custodian  acting on
behalf of the Collateral  Agent pursuant to a written  agreement  apprising such
custodian  of,  and  obligating   such  custodian  to  observe  (to  the  extent
applicable),  this Agreement) shall at all times maintain physical possession of
the  Collateral  First  Mortgage Bonds until the same are paid or deemed to have
been paid or otherwise  satisfied and discharged as provided in this  Agreement,
the Collateral First Mortgage Bonds and/or the Indentures.

               SECTION  2.5  Registration  Rights and Related  Matters.  (a) The
Collateral  Agent and the Lenders (or any purchaser from, or other successor to,
any Lender with respect to any Collateral  First Mortgage  Bonds) shall have the
right  to  sell  or  otherwise  dispose  of any or all of the  Collateral  First
Mortgage Bonds, so long as (i) any such sale or other  disposition  occurs on or
after the Acceleration Day, and (ii) prior to (or simultaneously  with) any such
sale or other disposition,  the Remedy Exercise Day has occurred (or occurs) and
the Loans and the  Obligations  have been (or are)  satisfied and  discharged in
full in accordance with Section 4.1 hereof (without any further liability on


                                       5



the part of the Company  therefor).  For the avoidance of doubt, it is expressly
stated  that (x) on the Remedy  Exercise  Day,  one or more  Lenders  may become
registered  owners of the Collateral  First Mortgage Bonds (and  thereafter such
Lender  or  Lenders  may sell or  otherwise  dispose  of such  Collateral  First
Mortgage Bonds), and/or (y) on the Remedy Exercise Day, one or more Persons that
are  purchasers  from the  Collateral  Agent or one or more  Lenders  may become
registered owners of the Collateral First Mortgage Bonds (thereby  obviating the
necessity for any  subsequent  sale of such  Collateral  First Mortgage Bonds by
such Lender or Lenders).

      (b) If, in connection with any sale or transfer by the Collateral Agent or
any  Lender (or any  purchaser  from,  or other  successor  to, any Lender  with
respect to any Collateral  First Mortgage  Bonds) that is permitted  pursuant to
Section 2.5(a) hereof (a "Permitted  Sale"), the Collateral Agent or such Lender
(or purchaser) requests,  by written notice to the Company, that such Collateral
First Mortgage Bonds be registered  under the Securities Act of 1933, as amended
(together  with any  successor  statute  thereto,  the  "Securities  Act") (such
written  request to  generally  describe  such  Permitted  Sale and the intended
method of disposition contemplated for such Permitted Sale), the Company, at the
Company's costs and expense, shall as soon as practicable:

               (I)  cause  a   registration   statement  with  respect  to  such
      Collateral  First Mortgage  Bonds (A) to become  effective so as to permit
      such Permitted Sale in accordance  with the intended method of disposition
      of such  Collateral  First Mortgage Bonds  contemplated  by such Permitted
      Sale, and (B) to remain  effective  until the earlier of the expiration of
      two (2) years from the effective  date thereof or the  disposition of such
      Collateral  First  Mortgage  Bonds  pursuant  thereto  (referred to in the
      proviso  to this  Section  2.5(b)  as "to  effect  registration"  or words
      similar thereto);

               (II) register or qualify such  Collateral  First  Mortgage  Bonds
      covered by such registration statement under all applicable "blue sky" and
      other state securities laws and keep such registration or qualification in
      effect for so long as such registration statement remains in effect;

               (III) cause such Collateral  First Mortgage Bonds covered by such
      registration  statement  to be  registered  with or approved by such other
      Governmental  Authorities having  jurisdiction with respect to the Company
      and/or such Collateral First Mortgage Bonds as may be reasonably necessary
      to permit such  Permitted Sale in accordance  with the intended  method of
      disposition of such Collateral  First Mortgage Bonds  contemplated by such
      Permitted Sale;

               (IV)  comply with all  applicable  rules and  regulations  of the
      Securities  and  Exchange  Commission  relating  to or arising out of such
      registration  statement,  including,  without  limitation,  qualifying the
      Indentures under the Trust Indenture Act of 1939, as amended,  and to make
      available to its security holders, as soon as reasonably  practicable,  an
      earnings  statement  satisfying  the  provisions  of Section  11(a) of the
      Securities Act and Rule 158 promulgated thereunder; and



                                       6




               (V) take  such  other  actions  as the  Collateral  Agent or such
      Lender shall  reasonably  request in order to expedite or  facilitate  the
      disposition  of such  Collateral  First  Mortgage Bonds pursuant to and as
      contemplated by such registration statement;

provided,  however,  that the  Company  shall  not be  required  to  effect  any
registration  pursuant to this  Section 2.5 if (i) such  registration  shall not
have been  requested  or approved by Lenders (or any  purchaser  from,  or other
successor to, any Lender with respect to any Collateral  First  Mortgage  Bonds)
for whom an aggregate principal amount of at least $95 million of the Collateral
First  Mortgage  Bonds are held or owned,  or (ii) more than two (2) years shall
have elapsed subsequent to the Remedy Exercise Day.

               SECTION 2.6 Private Sales.  The Company and the Collateral  Agent
hereby  acknowledge and agree that: (a) the Collateral  Agent and/or the Lenders
(or any purchaser  from,  or other  successor to, any Lender with respect to any
Collateral  First Mortgage Bonds) may effect any Permitted Sale in a transaction
exempt from  registration  under the Securities  Act; (b) such Permitted Sale in
such transaction  will be deemed to have been made in a commercially  reasonable
manner;  and (c) although such Permitted Sale in such  transaction may result in
prices  and  terms  less  favorable  than if such  Permitted  Sale were a public
offering,  neither  that fact nor any other fact,  event or  circumstance  shall
result in (x) the  Obligations  not being  satisfied  and  discharged in full in
accordance  with  Section  4.1  hereof  or the  Company  being  liable  for  any
deficiency  between the  proceeds  of such  Permitted  Sale and the  Obligations
previously  payable to such Lender,  or (y) any claim by the Company against the
Collateral Agent or any Lender.



                                  ARTICLE III

                         REPRESENTATIONS, WARRANTIES AND
                            COVENANTS OF THE COMPANY

The  Company  represents,   warrants  and  covenants,   which   representations,
warranties and covenants shall survive execution and delivery of this Agreement,
as follows:

               SECTION 3.1 Name and Jurisdiction of Organization.  The Company's
name,  within the meaning of Section 9-503(a) of the Uniform  Commercial Code as
in effect in the State of New York, is NorthWestern Corporation.  The Company is
a  corporation  organized  solely under the laws of the State of Delaware and no
other state or  jurisdiction,  and,  pursuant to applicable law, such State must
maintain a public  record  showing  the Company to have been so  organized.  The
Company's  organizational  identification  number  in the State of  Delaware  is
0161208.

               SECTION 3.2 Collateral First Mortgage Bonds; Related Matters. (a)
The  Collateral  First Mortgage  Bonds have been validly  authorized,  executed,
issued,  authenticated  and delivered to the Collateral  Agent and registered in
its name as


                                       7



Collateral  Agent.  All First  Mortgage  Approvals have been obtained and are in
full force and effect. The Supplemental Indentures have been validly authorized,
executed and delivered.

      (b) No consent  of any other  Person and no  authorization,  approval,  or
other  action  by,  or  notice to or filing  with,  any  Person or  Governmental
Authority of any  jurisdiction  is required (i) for the  execution,  delivery or
performance  of this  Agreement  by the  Company,  (ii) for the  issuance of the
Collateral First Mortgage Bonds,  (iii) for the exercise by the Collateral Agent
of any Collateral  First Mortgage  Bondowner  Right, or (iv) for the exercise by
the Collateral Agent or any Lender of any other right,  power or remedy provided
for in this  Agreement  or the  relevant  Indenture  other  than  (x) the  First
Mortgage  Approvals,  which  have been duly  obtained  and are in full force and
effect,  or (y) in the case of a Permitted Sale of the Collateral First Mortgage
Bonds as  contemplated  pursuant to Section 2.5(a) hereof,  any Federal or State
securities  law   registrations,   qualifications   or  filings  and  any  other
registrations  and  approvals of other  Governmental  Authorities  in connection
therewith as described in Section 2.5(b) hereof.

               SECTION 3.3 Other  Consents.  The Company shall  promptly  obtain
such other  consents,  authorizations,  and  approvals,  and  obtain  such other
actions  by,  and  provide  such  notices  to or make  such  filings  with,  any
Governmental Authority of any jurisdiction as may be, in the reasonable judgment
of the Collateral Agent,  necessary after the date of the execution and delivery
of this  Agreement for the exercise by the  Collateral  Agent of any  Collateral
First Mortgage  Bondowner Right or, subject to Sections 2.5 and 4.1 hereof,  any
other  right,  power or remedy  provided  for in this  Agreement or the relevant
Indenture.

               SECTION  3.4  Change of Name,  Jurisdiction  of  Organization  or
Location  of  Place  of  Business.  The  Company  will  not  change  its name or
jurisdiction  of organization or the location of its principal place of business
or its chief executive office without,  in any such case, giving at least thirty
(30) days'  prior  written  notice  thereof to the  Collateral  Agent;  and,  in
connection  with any such  change,  the  Company  will  promptly  and at its own
expense execute and deliver and/or file or record such instruments and documents
as the Collateral Agent may reasonably require to protect and/or to maintain its
interests hereunder and in the Collateral First Mortgage Bonds.

               SECTION 3.5 Further Assurances. The Company agrees that from time
to time, at the expense of the Company,  the Company will  promptly  execute and
deliver and/or file or record all further  instruments  and  documents,  provide
further information, and take all further action, that may be necessary, or that
the  Collateral  Agent  may  reasonably  request,  in order  to  carry  out more
effectively  the  intent  and  purpose  of this  Agreement  (including,  without
limitation,  to  establish,  maintain and protect the  Security  Interest and to
enable the  Collateral  Agent to exercise  and  enforce  its rights,  powers and
remedies  hereunder in accordance  with the terms  hereof).  The Company  hereby
authorizes  the Collateral  Agent to file one or more financing or  continuation
statements,  and amendments  thereto,  relative to the Security Interest without
the  signature of the Company  where  permitted by  applicable  law. The Company
shall,  promptly upon the reasonable request of the Collateral Agent, provide to
the Collateral  Agent such


                                       8



information  as the  Collateral  Agent may  reasonably  request  concerning  the
receipt and application of any payments made under or pursuant to the Collateral
First Mortgage Bonds or the Indentures.

               SECTION 3.6 Filing; No Further Security Interest. The Company has
not and will not  authorize  the  filing  of any  financing  statement  or other
instrument similar in effect covering all or any part of the collateral in which
the Security Interest is granted  hereunder,  except such as have been or may be
filed in favor of the  Collateral  Agent;  and the Company has not granted,  and
will not  assign,  grant,  or convey any other  security  interest or lien in or
hypothecate all or any part of its interest therein.

               SECTION 3.7 Filing or Recording of Supplemental Indentures.  Each
Supplemental  Indenture  shall be duly filed and/or  recorded in accordance with
the requirements of the relevant Indenture,  and all fees or taxes in connection
therewith shall be promptly paid by the Company.

               SECTION 3.8  Delivery of Notices.  For so long as the  Collateral
Agent is the registered owner of all of the Collateral First Mortgage Bonds, the
Company  covenants to deliver to the  Collateral  Agent,  concurrently  with the
delivery thereof or promptly after receipt thereof, copies of all notices to the
Company or any trustee under the Indentures.



                                   ARTICLE IV

                               RIGHT TO DISPOSE OF
                         COLLATERAL FIRST MORTGAGE BONDS

               SECTION 4.1 Right to Dispose of Collateral  First Mortgage Bonds.
The Collateral Agent shall have the right, on or after the Acceleration Day, and
at the direction of Lenders having Loans  representing  sixty-six and two-thirds
percent (66 2/3%) of all Loans then  outstanding (it being  understood that such
right shall be  exercisable by the  Collateral  Agent in the sole  discretion of
such  Lenders),  to transfer  to, or upon the order of the  Lenders  (whether in
connection  with the sale or other  disposition by one or more of the Lenders of
the Collateral First Mortgage Bonds or otherwise) all (but not less than all) of
the Collateral  First Mortgage Bonds in full  satisfaction  and discharge of the
Loans and the Obligations (any other right of the Collateral Agent, as a secured
party, under applicable law to sell or otherwise dispose of the Collateral First
Mortgage  Bonds being  expressly  waived).  Upon such  transfer (on or after the
Acceleration  Day),  and without the necessity for any further action or writing
on the part of any Person,  (i) the Loans,  the Notes and the Obligations  shall
be, and shall be deemed and construed to be,  satisfied and  discharged in full,
and (ii) this Agreement  (including  the Security  Interest and the covenants of
the Company  hereunder)  shall  terminate,  except as to those  provisions  that
expressly survive termination of this Agreement.



                                       9




               SECTION 4.2  Reservation  of Other Rights.  Nothing  contained in
Section 4.1 hereof shall,  or shall be deemed or construed  to, alter,  limit or
restrict  (i) the right of the  Collateral  Agent  (prior to any transfer of the
Collateral  First Mortgage Bonds on the Remedy Exercise Day) or the right of the
Lender or any other Person (on or after such  transfer of the  Collateral  First
Mortgage  Bonds on the Remedy  Exercise  Day) to exercise any  Collateral  First
Mortgage Bondowner Rights,  (ii) the right of the Collateral Agent or any Lender
(or any purchaser  from,  or other  successor to, any Lender with respect to any
Collateral  First  Mortgage  Bonds)  to  cause a  Permitted  Sale  (or,  in such
connection,  to exercise its rights under Section 2.5(b) hereof)),  or (iii) the
right  of the  Administrative  Agent,  the  Collateral  Agent or any  Lender  to
exercise any other right, power or remedy (other than any right, power or remedy
to cause  the sale or other  disposition  of  Collateral  First  Mortgage  Bonds
(excluding  any transfer  under Section 5.2 or 6.4 hereof)) that is available to
it under the Credit  Agreement or any other Loan Document or at law or in equity
by reason of the occurrence and continuance of any Event of Default.

               SECTION 4.3  Subsequent  Dispositions.  The Company  shall not be
liable for any  deficiency  between  the amount of the  proceeds  of any sale or
other disposition (or deemed sale or other  disposition) of the Collateral First
Mortgage Bonds on or after the Remedy  Exercise Day and the aggregate  amount of
the Obligations (and any right of the Collateral Agent or any Lender to any such
deficiency is hereby waived).

                                   ARTICLE V

                          COLLATERAL AGENT AND LENDERS

               SECTION 5.1 Authority and Duties of Collateral Agent. The Company
acknowledges that the rights and  responsibilities of the Collateral Agent under
this  Agreement  with  respect  to any  action  taken by it or the  exercise  or
non-exercise by it of any option, voting right, request, judgment or other right
or remedy  provided  for herein or  resulting  or arising out of this  Agreement
shall, as between the Collateral Agent and the other Lenders, be governed by the
Credit  Agreement and by such other agreements with respect thereto as may exist
from time to time among  them,  but,  as between  the  Collateral  Agent and the
Company, the Collateral Agent shall be conclusively  presumed to be acting as an
agent for the Lenders  with full and valid  authority  so to act or refrain from
acting, and neither the Company nor any Person (including,  without  limitation,
any  trustee  under  either  Indenture)  shall  be  under  any  obligation,   or
entitlement,  to make any inquiry  respecting  such authority or shall incur any
liability for or by reason of not making any inquiry  respecting such authority.
The powers conferred on the Collateral Agent hereunder or as registered owner of
the Collateral  First  Mortgage Bonds under the Indentures  shall not impose any
duty upon it to exercise any such powers.  Solely as between the Lenders and the
Collateral Agent (and subject to the next succeeding  sentence),  the Collateral
Agent shall  exercise  Collateral  First Mortgage  Bondowner  Rights as shall be
reasonably directed by the Required Lenders;  provided that unless and until the
Collateral Agent shall have received such  directions,  the Collateral Agent may
(but shall not be  obligated  to) take such  action,  or refrain from taking any
such action as it shall deem advisable in the best interests of the Lenders. The
Collateral  Agent  shall be fully  justified  in failing or refusing to take any
action or exercising  any power under this


                                       10



Agreement or as registered  owner of the Collateral  First Mortgage Bonds unless
it shall first receive such advice or concurrence of the Required  Lenders as it
deems  appropriate or it shall first be indemnified to its  satisfaction  by the
Lenders against any and all liability and expense which may be incurred by it by
reason of taking or continuing to take any such action or exercising such power.
Except for the exercise of reasonable  care (the cost and expense of which shall
be for the Company's account payable upon demand) with respect to the custody of
the Collateral  First Mortgage  Bonds in its actual  possession,  the Collateral
Agent shall have no duty as to any first mortgage  bonds or other  collateral or
as to the taking of any necessary steps to preserve rights against prior parties
or any other rights  pertaining to any first mortgage bonds or other  collateral
and no such duties shall be implied as arising  hereunder.  The Collateral Agent
shall  be  deemed  to  have  exercised   reasonable  care  in  the  custody  and
preservation  of the  Collateral  First Mortgage Bonds in its possession if such
Collateral First Mortgage Bonds are accorded  treatment  substantially  equal to
that which it accords its own property.

               SECTION 5.2 Successor  Collateral  Agent. Upon the appointment of
any successor  Administrative  Agent pursuant to and in accordance  with Section
8.9 of the Credit Agreement  (including,  if applicable in accordance therewith,
the consent of the Company) and the transfer to such successor  Collateral Agent
of the Collateral  First Mortgage  Bonds,  such successor  Administrative  Agent
shall  succeed to the rights,  powers and duties of the  Collateral  Agent under
this  Agreement  and,  other than  rights to  indemnification  and  recovery  of
expenses under Section 6.1, the former  Collateral  Agent's  rights,  powers and
duties as Collateral Agent under this Agreement shall be terminated, without any
other or further act on the part of any Person.

               SECTION 5.3 Protections of Collateral  Agent. With respect to its
rights,  powers  and  duties  hereunder,  the  Collateral  Agent  has all of the
exculpations,  protections  and  indemnities as are provided to it in the Credit
Agreement.

               SECTION 5.4 Applicable Share  Certificates.  The Collateral Agent
shall furnish to each of the Corporate  Trustee under the Montana First Mortgage
Indenture and the Trustee under the South Dakota First Mortgage  Indenture (with
a copy to the Company)  promptly  after any change in the  Applicable  Share (as
defined  in the  Supplemental  Indenture  forming  part of such  Indenture),  an
Applicable Share Certificate (as defined in such Supplemental Indenture), signed
by a person purporting to be the Collateral Agent's duly authorized officer, and
setting forth the information recited in the Supplemental Indenture forming part
of such Indenture to be set forth in an Applicable Share Certificate.

               SECTION 5.5  Private  Placement  Representations.  Each Lender is
deemed,  upon the making by such Lender of a Loan,  to represent  and warrant as
follows (it being understood that any such representation or warranty relates to
such Lender with respect to itself only):

      (a) The Collateral Agent is acquiring  Collateral First Mortgage Bonds for
the account of such Lender and not with a view on the part of such Lender to, or
for resale in connection with, any distribution thereof. Each Lender understands
that the  Collateral


                                       11



First Mortgage Bonds have not been registered  under the Securities Act and that
specific  exemption  from the  registration  provisions  of the  Securities  Act
depends upon, among other things,  the bona fide nature of the investment intent
of the Lenders as described herein.

      (b) Each Lender is familiar  with the business of the Company,  has had an
opportunity to discuss the Company's business,  management and financial affairs
with  the  Company's  management  and has had the  opportunity  to  obtain  such
information about the Company's business, management and financial affairs as it
has requested.

      (c) Each Lender has  knowledge  and  experience  in financial and business
matters  relating to an investment  in securities of the Company,  is capable of
evaluating  the  merits  and  risks of such an  investment,  is able to bear the
economic risk of such an investment  for an indefinite  period of time, and is a
"qualified   institutional  buyer"  within  the  meaning  of  Rule  144A  or  an
"accredited  investor"  within  the  meaning  of Rule  501(a),  in either  case,
promulgated by the Securities and Exchange Commission under the Securities Act.



                                   ARTICLE VI

                                  MISCELLANEOUS

               SECTION  6.1  Indemnification,  Expenses,  Etc..  (a) The Company
agrees that it shall  indemnify and defend the Collateral  Agent and each of the
Lenders, and each of their respective officers,  directors,  employees,  agents,
professional   advisors  and  Affiliates  (each  an  "Indemnified  Person",  and
together,  "Indemnified  Persons"),  and  hold  each of them  harmless  from and
against any and all costs, claims, losses,  expenses, and liabilities (including
reasonable  attorneys' fees and disbursements)  arising out of or resulting from
this Agreement (including, without limitation,  enforcement of this Agreement or
any document prepared in connection  therewith) or the interests created hereby,
except,  in the case of any  Indemnified  Person,  to the extent,  such  claims,
losses,  expenses or  liabilities  are  determined,  pursuant to a judgment by a
court of competent  jurisdiction  that has become final to be the result of such
Indemnified  Person's  gross  negligence or willful  misconduct.  No Indemnified
Person  shall be liable for any  special,  indirect,  consequential  or punitive
damages  (whether or not the claim  therefor is based on contract,  tort or duty
imposed by law) in connection with,  arising out of or in any way related to the
transactions contemplated by this Agreement,  including, without limitation, any
act, omission or event occurring in connection herewith.

      (b) All reasonable costs, expenses, charges and fees (including reasonable
attorneys' fees and  disbursements)  paid or incurred by the Collateral Agent in
connection with:


                                       12



            (i) the  administration  of this Agreement or the exercise of any of
      the rights,  remedies  or powers  granted to the  Collateral  Agent or the
      Lenders hereunder;

            (ii) the  custody  of the  Collateral  First  Mortgage  Bonds or the
      exercise on or prior to the Remedy  Exercise Day of any  Collateral  First
      Mortgage Bondowner Rights;

            (iii)  the  perfection,   maintenance,   protection  or  enforcement
      (whether  through   negotiations,   legal  proceedings  or  otherwise  and
      including,  without  limitation,  in  connection  with any  bankruptcy  or
      insolvency  proceedings involving the Company) of any of the rights of the
      Collateral Agent or the Lenders hereunder; or

            (iv) the  failure by the  Company  to perform or observe  any of the
      provisions hereof,

shall be for the account of the Company,  and the Company undertakes promptly on
demand, and in any case, within five (5) Business Days following such demand, to
pay the same or, as the case may be, to reimburse  the  Collateral  Agent and/or
its agents, representatives, successors and assigns, as the case may be, for any
monies paid by it with  interest  thereon at the rate of interest  most recently
announced by the  Collateral  Agent as its prime rate in effect at its principal
office in New York City  plus  interest  calculated  at the  applicable  rate on
overdue amounts as set forth in Section 2.9(c) of the Credit Agreement, from the
date the same shall have been paid by the  Collateral  Agent  and/or its agents,
representatives, successors and assigns until actually paid by the Company.

               SECTION 6.2 Obligations Absolute.  The obligations of the Company
under this  Agreement  shall be absolute and  unconditional  and shall remain in
full force and effect without  regard to, and shall not be released,  suspended,
discharged,  terminated or otherwise affected by, any circumstance or occurrence
whatsoever, including, without limitation: (a) any renewal, extension, amendment
or  modification  of, or addition or supplement to or deletion  from, the Credit
Agreement  or any other  Loan  Document  or any other  instrument  or  agreement
referred to therein,  or any  assignment  or  transfer of any  thereof;  (b) any
waiver, consent,  extension,  indulgence or other action or inaction under or in
respect of any such instrument or agreement or this Agreement or any exercise or
non-exercise  of any right,  remedy,  power or privilege  under or in respect of
this Agreement or any other Loan Document;  or (c) any invalidity,  irregularity
or unenforceability of all or part of the Obligations.

               SECTION 6.3 Remedies  Cumulative;  Delay Not Waiver. (a) Remedies
Cumulative.  No  failure  or  delay  on the  part  of the  Collateral  Agent  in
exercising  any right,  power or  privilege  hereunder  and no course of dealing
between the Company and the Collateral  Agent shall operate as a waiver thereof;
nor shall any  single or  partial  exercise  of any  right,  power or  privilege
hereunder or under any other applicable  document  preclude any other or further
exercise  thereof  or the  exercise  of any  other  right,


                                       13



power or  privilege  hereunder  or  thereunder.  Except as  otherwise  expressly
provided herein, the rights,  powers and remedies herein expressly provided,  or
available at law or in equity,  are  cumulative and not exclusive of any rights,
powers or remedies which the Collateral Agent would otherwise have. No notice to
or demand on the  Company in any case shall  entitle the Company to any other or
further  notice or demand in  similar or other  circumstances  or  constitute  a
waiver of the rights of the  Collateral  Agent to any other or further action in
any circumstances without notice or demand.

      (b) No Waiver; Separate Causes of Action. No delay or omission to exercise
any right,  power or remedy accruing to the Collateral Agent upon the occurrence
of any breach or default of the Company  under this  Agreement or any other Loan
Document shall impair any such right,  power or remedy of the Collateral  Agent,
nor shall it be  construed  to be a waiver of any such breach or default,  or an
acquiescence  therein,  or of or in any  similar  breach or  default  thereafter
occurring,  nor shall  any  waiver of any other  breach or  default  under  this
Agreement  or any other Loan  Document be deemed a waiver of any other breach or
default  theretofore or thereafter  occurring.  Any waiver,  permit,  consent or
approval of any kind or  character  on the part of the  Collateral  Agent of any
breach or default under this Agreement, or any waiver on the part of the Lenders
or of the Collateral Agent of any provision or condition of this Agreement, must
be in  writing  and  shall  be  effective  only to the  extent  in such  writing
specifically  set forth.  Each and every default by the Company  hereunder shall
give rise to a separate  cause of action  hereunder,  and separate  suits may be
brought hereunder as each cause of action arises.

               SECTION  6.4  Termination.  This  Agreement  (including,  without
limitation,  the Security  Interest and the covenants of the Company  hereunder)
shall  terminate on the earlier of (i) the  indefeasible  payment in full of the
Loans and the  Obligations or (ii) the Remedy  Exercise Day. In connection  with
the  termination of this  Agreement,  the Collateral  Agent,  at the request and
expense of the Company,  shall promptly execute and deliver to the Company,  and
authorize the filing or recording of, such instruments and documents (including,
without  limitation,  Uniform  Commercial Code termination  statements and other
terminations  and  releases)  as may be  reasonably  requested by the Company to
acknowledge  and evidence  such  termination  and the related  satisfaction  and
discharge  of the Loans and the  Obligations.  In  addition,  if this  Agreement
terminates upon the indefeasible payment in full of the Obligations (without the
occurrence of the Remedy  Exercise Day), the  Collateral  Agent shall  surrender
each  Collateral  First Mortgage Bond to the Company (or, if so requested by the
Company,  to the Corporate Trustee under the Montana First Mortgage Indenture or
the Trustee under the South Dakota First Mortgage  Indenture) for  cancellation.
If this  Agreement  shall be  terminated  or revoked by  operation  of law,  the
Company shall indemnify and save the Collateral Agent and the other  Indemnified
Persons  harmless  from  any loss  which  may be  suffered  or  incurred  by the
Collateral Agent and the other Indemnified  Persons in acting hereunder prior to
the  receipt  by  the  Collateral  Agent,  its  successors  of  notice  of  such
termination or revocation.

               SECTION 6.5 Taxes.  The Company  agrees to pay, and indemnify and
hold harmless the Collateral  Agent and the Lenders from, any and all present or
future stamp, documentary,  excise, sales or other taxes or charges, any and all
recording and


                                       14



filing fees,  and any and all  liabilities  with respect  thereto,  which may be
payable or  determined  to be  payable  in  connection  with the  execution  and
delivery  of,  or  consummation  or  administration  of any of the  transactions
contemplated by, or payment under, or any amendment,  supplement or modification
of, or any waiver or consent under or in respect of, this Agreement.

               SECTION 6.6  Amendments,  Etc. This Agreement may be amended only
by an instrument in writing signed by each of the parties hereto,  in accordance
with Section 9.1 of the Credit Agreement.

               SECTION  6.7  Address   for   Notices.   All  notices  and  other
communications  hereunder shall be given (in the manner  specified in the Credit
Agreement)  to  the  parties  hereto  at the  addresses  specified  under  their
respective names on the signature pages hereto, or as to any party at such other
address as shall be designated  by such party in a written  notice to each other
party.

               SECTION 6.8  Severability.  If any  provision  of this  Agreement
shall be held or deemed to be or shall,  in fact,  be  illegal,  inoperative  or
unenforceable,  the same  shall not  affect any other  provision  or  provisions
herein contained or render the same invalid, inoperative or unenforceable to any
extent whatever.

               SECTION 6.9  Survival of  Provisions.  Sections 2.2 (but only the
first sentence  thereof),  2.5, 2.6, and 3.5 of this Agreement shall survive the
satisfaction  and discharge of the  Obligations  in  connection  with the Remedy
Exercise Day and the related  termination of this Agreement.  Sections 5.3, 6.1,
6.3,  6.4,  6.5,  6.12 and 6.13 of this  Agreement  shall survive any payment or
cancellation of the  Obligations,  the occurrence of the Remedy Exercise Day and
any termination of this Agreement.

               SECTION 6.10 Binding  Agreement.  This Agreement shall be binding
upon and inure to the benefit of the Company,  the Collateral Agent, the Lenders
and their  respective  successors and permitted  assigns.  Neither party to this
Agreement may assign or transfer any of its rights or  obligations  hereunder to
any other Person  without the prior  written  consent of the other party to this
Agreement  (except  for any  transfer  by the  Collateral  Agent to a  successor
Collateral Agent), and any purported assignment or transfer in violation of this
provision shall be void.

               SECTION  6.11  Headings.  The  headings of the various  articles,
sections and paragraphs of this Agreement are for convenience of reference only,
do not constitute a part hereof and shall not affect the meaning or construction
of any provision hereof.

               SECTION 6.12  GOVERNING  LAW.  THIS  AGREEMENT AND THE RIGHTS AND
OBLIGATIONS  OF THE  PARTIES  UNDER THIS  AGREEMENT  SHALL BE  GOVERNED  BY, AND
CONSTRUED AND  INTERPRETED IN ACCORDANCE  WITH, THE LAW OF THE STATE OF NEW YORK
WITHOUT  REGARD TO THE PRINCIPLES OF CONFLICT OF LAWS THEREOF OTHER THAN SECTION
5-1401 OF THE GENERAL OBLIGATIONS LAW OF THE STATE OF NEW YORK.



                                       15



               SECTION 6.13 WAIVER OF JURY TRIAL;  SUBMISSION  TO  JURISDICTION.
EACH PARTY HERETO HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES TRIAL BY JURY IN
ANY  LEGAL  ACTION  OR  PROCEEDING  RELATING  TO  THIS  AGREEMENT  AND  FOR  ANY
COUNTERCLAIM THEREIN.

THE COMPANY AGREES THAT ANY LEGAL ACTION OR PROCEEDING BY OR AGAINST THE COMPANY
OR WITH RESPECT TO OR ARISING OUT OF THIS AGREEMENT MAY BE BROUGHT IN OR REMOVED
TO THE COURTS OF THE STATE OF NEW YORK,  IN AND FOR THE  COUNTY OF NEW YORK,  OR
THE COURTS OF THE UNITED  STATES OF AMERICA  FOR THE  SOUTHERN  DISTRICT  OF NEW
YORK,  AS THE  COLLATERAL  AGENT MAY ELECT.  BY  EXECUTION  AND DELIVERY OF THIS
AGREEMENT,  THE  COMPANY  ACCEPTS,  FOR ITSELF  AND IN RESPECT OF ITS  PROPERTY,
GENERALLY AND  UNCONDITIONALLY,  THE JURISDICTION OF THE AFORESAID  COURTS.  THE
COMPANY  IRREVOCABLY  CONSENTS  TO  THE  SERVICE  OF  PROCESS  OUT OF ANY OF THE
AFOREMENTIONED  COURTS IN ANY MANNER PERMITTED BY APPLICABLE LEGAL REQUIREMENTS.
NOTHING  HEREIN  SHALL AFFECT THE RIGHT OF THE  COLLATERAL  AGENT TO BRING LEGAL
ACTION OR PROCEEDINGS IN ANY OTHER  COMPETENT  JURISDICTION.  THE COMPANY HEREBY
WAIVES  ANY  RIGHT TO STAY OR  DISMISS  ANY  ACTION  OR  PROCEEDING  UNDER OR IN
CONNECTION WITH THIS AGREEMENT  BROUGHT BEFORE THE FOREGOING COURTS ON THE BASIS
OF FORUM NON CONVENIENS.

               SECTION  6.14 Third  Party  Rights.  Nothing  in this  Agreement,
expressed or implied,  is intended or shall be construed to confer upon, or give
to any Person, other than the Company, the Collateral Agent and the Lenders, any
security,  rights,  remedies or claims,  legal or equitable,  under or by reason
hereof or any covenant or condition hereof; and this Agreement and the covenants
and  agreements  herein  contained  are and shall be held to be for the sole and
exclusive benefit of the Company, the Collateral Agent and the Lenders.

               SECTION 6.15  Integration.  This Agreement,  the Credit Agreement
and the  other  Loan  Documents  represent  the  agreement  of the  Company  the
Collateral  Agent and the Lenders with respect to the subject  matter hereof and
thereof, and there are no promises, undertakings,  representations or warranties
by the Company,  the  Collateral  Agent and the Lenders  relative to the subject
matter hereof and thereof not expressly set forth or referred to herein,  in the
Credit Agreement or in the other Loan Documents.

               SECTION 6.16  Execution in  Counterparts.  This  Agreement may be
executed  in any  number of  counterparts  and by  different  parties  hereto in
separate  counterparts,  each of which when so executed shall be deemed to be an
original  and all of which  taken  together  shall  constitute  one and the same
instrument.

               SECTION 6.17 Conflict with Other  Documents.  In the event of any
conflict or inconsistency  between this Agreement (or any provision  hereof) and
any other


                                       16



agreement   now  existing  or  hereafter   entered  into  and  relating  to  the
transactions  contemplated hereby (other than an amendment hereto), the terms of
this Agreement shall in all respects prevail and govern.

                           [Signature page to follow]





                                       17




               IN WITNESS WHEREOF, the parties hereto have caused this Agreement
to be duly executed and delivered by their officers thereunto duly authorized as
of the date first above written.



                                      NORTHWESTERN CORPORATION


                                      By:  /s/ Kipp D. Orme
                                           ----------------------
                                      Name:  Kipp D. Orme
                                      Title: Vice President and Chief
                                             Financial Officer

                                      Address for notice:

                                      125 South Dakota Avenue, Suite 1100
                                      Sioux Falls, South Dakota 57104-6403
                                      Attention: Chief Financial Officer
                                      Telephone: (605) 978-2908
                                      Telecopier: (605) 978-2910

                                      CREDIT SUISSE FIRST BOSTON, acting through
                                      its Cayman Islands Branch, not in its
                                      individual capacity, but solely as
                                      Collateral Agent


                                      By:  /s/ S. William Fox
                                           ----------------------
                                      Name:  S. William Fox
                                      Title: Director


                                      By:  /s/ Brian Caldwell
                                           ----------------------
                                      Name:  Brian Caldwell
                                      Title: Director

                                      Address for notice:

                                      Eleven Madison Avenue
                                      New York, New York 10010-3629
                                      Attention: Rob Loh
                                      Telephone: (212) 538-1690
                                      Telecopier: (212) 325-8304


                                       18