Exhibit 10(a)(1)
                                     
                    NORTHWESTERN PUBLIC SERVICE COMPANY
                     SUPPLEMENTAL INCOME SECURITY PLAN


                                 ARTICLE I
                      DEFINITIONS AND INTERPRETATIONS

      1.1   Definitions.   When the following terms are  used  herein  with
initial capital letters, they shall mean:

           (a)   Administrator.   The Company or  such  individual  or
     committee as the Company shall designate from time to time.   The
     Administrator shall have the authority to administer the Plan and
     to   construe   its   provisions,  and  the  decisions   of   the
     Administrator  shall be final and binding on  all  parties.   The
     Administrator  shall  constitute the "administrator"  and  "named
     fiduciary"  of  the  Plan  within the  meaning  of  the  Employee
     Retirement Income Security Act of 1974 ("ERISA").
     
          (b)  Company.  Northwestern Public Service Company.
     
           (c)   Disability.   The total and permanent  disability  as
     determined by a doctor of medicine approved by the Company, which
     event will be deemed to have occurred on the date of delivery  of
     such doctor's certificate to such effect to the Company.  In lieu
     of  such certification, the Company may accept, as proof of total
     and  permanent disability, proof of the Participant's eligibility
     for disability benefits under the Federal Social Security Act, as
     amended from time to time.
     
           (d)  Earnings.  The amount of salary paid by the Company to
     a  Participant  for services rendered, excluding any  commissions
     and bonuses.
     
           (e)  Earnings Level.  Earnings within a prescribed range as
     shown on the attached Schedule A.
     
           (f)   Employee.   An  individual who  customarily  works  a
     regularly scheduled work week with the Company of at least twenty
     (20) hours per week.
     
           (g)   Participant.  An Employee who has become eligible  to
     participate in the Plan in accordance with Article II.
     
           (h)   Plan Anniversary.  The first day of a Plan Year which
     is July 1 of each year.
     
           (i)  Plan Year.  The twelve (12) month period beginning  on
     July 1 and ending on June 30.
     
           (j)   Retirement  Date.  The later  of  the  Employee's  or
     Director's 65th birthday or retirement from the Company.

     1.2  Gender and Number.  The pronouns "he", "him" and "his", referring
to an Employee, Participant or Beneficiary, shall also refer to and include
females  as  well as males, and the singular shall include the plural,  and
the plural the singular, except when the context or otherwise requires.

                                ARTICLE II
                                ELIGIBILITY

     2.1  Eligibility.  Senior management employees who are selected by the
Chief  Executive  Officer  of  the Company ("Eligible  Employee")  and  all
outside  members of the Board of Directors of the Company shall be eligible
to  participate  in  this  Plan  as  of the  date  he  has  satisfied  such
requirement.  To be an Eligible Employee, one must:

          (a)  Be under age 65;
     
           (b)   Be credited with six months or more of service  in  a
     qualifying position; and
     
          (c)  Be actively at work on the Plan Anniversary Date.
     
           (d)   Be  in  a  state of health that would meet  customary
     requirements at reasonable standard insurance rates.

     2.2  Special State of Health Rule.  Participation in the Plan shall be
limited to those Eligible Employees and Directors whose state of health and
safety  at  the  time  of their entry into the Plan is  determined  to  the
satisfaction of the Administrator to be normal for their age group, on  the
basis  of  standards  comparable  to  those  customarily  employed  in  the
insurance  industry for setting standard premium rates; provided,  however,
that  the Administrator in its sole discretion may permit participation  by
an  Eligible Employee or Director whose state of health or safety does  not
meet  this  requirement,  on  the condition that  the  amount  of  benefits
provided  to  him or his Beneficiary may be reduced, at the Administrator's
discretion, from that which would otherwise apply to him under the terms of
this  Plan.  An Eligible Employee or Director who participates in the  Plan
under  this  section  shall be advised by the Administrator  in  a  written
notice  no later than sixty (60) days after the determination of his  state
of  health and safety as required herein, of the dollar amount of  benefits
to be provided to him (or his Beneficiary) under the Plan.

      2.3   Forfeiture  of  Eligibility.  No  benefits  shall  apply  to  a
terminated Participant who, prior to the occurrence of a Change in  Control
or Major Transaction, is discharged from his employment with the Company on
account of dishonesty or misconduct.

                                ARTICLE III
                                 BENEFITS

       3.1   Death  Benefits.   Upon  the  death  of  a  Participant,   the
Participant's  Beneficiary shall be entitled to receive Death  Benefits  in
the  form of a monthly income in the amount applicable to the Participant's
executed  certificate  on file (Earnings Level for Eligible  Employees)  as
shown on the attached Schedule A.

     3.2  Retirement Benefits.  Subject to the provisions of Article II, an
Eligible  Employee  shall upon his retirement, be  eligible  to  receive  a
Retirement Benefit on his Retirement Date.  The amount of benefit shall  be
based  on  the Participant's executed certificate on file as shown  on  the
attached  Schedule A.  An election for Retirement Benefits by  an  Eligible
Employee  must be made within thirty (30) days of Retirement.  At the  time
of  the election, the Eligible Employee may elect to receive all or part of
the  retirement benefit in 25% increments.  Once this election is made,  it
cannot be changed.

     3.3  Increase in Benefits.  Subject to the provisions of Article II, a
Participant whose Earnings increase to the extent that he enters  a  higher
Earnings  Level  shall become entitled to the amount of  benefits  of  such
higher  Earnings Level, as of the Plan Anniversary coincident with or  next
following such increase in Earnings provided, that he is actively  employed
by  the  Company  on  such Plan Anniversary, that he is credited  with  six
months or more of service in a qualifying position (under 2.1) and provided
further that if the state of health and safety of such a Participant is not
then  determined to the satisfaction of the Administrator to be normal  for
his  age  group, on the basis of standards comparable to those  customarily
employed  in  the  insurance  industry in setting  standard  or  reasonable
premium  rates, such increase in benefits shall apply only  to  the  extent
authorized by the Administrator.  The Administrator shall advise  any  such
Participant,  in a written notice no later than sixty (60) days  after  the
determination of his state of health and safety as required herein, of  the
dollar amount of benefits to be provided to him (or his Beneficiary)  under
the  Plan, which dollar amount shall in no event be less than that to which
he was entitled prior to such notice.

      3.4   Payment of Benefits.  Retirement benefits will be eligible  for
payment  on  the first of the month following the Participant's  Retirement
Date.   Death  Benefits will be paid to the participant's named beneficiary
on  the first of the month following the Participant's date of death.   All
Retirement and Death benefit payments shall be made in monthly installments
and  shall  continue for fifteen (15) years from the date  of  the  initial
monthly payment.

                                ARTICLE IV
                 PORTABILITY AND ELIGIBILITY FOR BENEFITS
                        IN THE EVENT OF TERMINATION

      4.1   Subject to, in the cases of clauses (a), (b) and (c) only,  the
provisions  of  Article  II,  an  Eligible Employee  whose  employment  has
terminated will be eligible for benefits if:

           (a)   The  Eligible  Employee retires under  the  Company's
     Pension Plan;
     
          (b)  The termination is due to total disability;
     
          (c)  The Eligible Employee terminates for reasons other than
     4.1(a), 4.1(b) or 4.1(d) and has beenemployed by the Company  for
     ten  (10) or more consecutive years or has five (5) years of Plan
     participation; or
     
           (d)  The Eligible Employee is terminated following a Change
     in  Control or Major Transaction (each as defined in Section  4.2
     hereof)  and such employee was employed by the Company  prior  to
     such Change in Control or Major Transaction.

     4.2  Definitions of Change in Control and Major Transaction

           (a)  Change in Control.  For purposes of the Plan, a Change
     in  Control of the Company shall occur upon the happening of  the
     earliest to occur of the following:
     
                1.    any Person (as defined below) is or becomes  the
          Beneficial Owner (as defined below), directly or indirectly,
          of   securities  of  the  Company  (not  including  in   the
          securities  beneficially owned by such Person any securities
          acquired  directly  from  the  Company  or  its  affiliates)
          representing 20% or more of the combined voting power of the
          Company's then outstanding securities; or
          
               2.   during any period of not more than two consecutive
          years  (not including any period prior to August __,  1995),
          individuals  who at the beginning of such period  constitute
          the  Board  and  any  new director (other  than  a  director
          designated  by  a Person who has entered into  an  agreement
          with the Company to effect a transaction described in clause
          (I)  of  this  paragraph or clauses (I), (II)  or  (III)  of
          paragraph  (b)  below)  whose  election  by  the  Board   or
          nomination  for  election by the Company's shareholders  was
          approved  or  recommended by a vote of at  least  two-thirds
          (2/3) of the directors then still in office who either  were
          directors  at the beginning of the period or whose  election
          or  nomination  for election was previously so  approved  or
          recommended, cease for any reason to constitute  a  majority
          thereof.
          
           (b)   Major Transaction.  For purposes of the Plan, a Major
     Transaction  shall occur upon the happening of  the  earliest  to
     occur of the following:
     
                1.    the shareholders of the Company approve a merger
          or  consolidation  of the Company with  any  corporation  or
          business  trust,  other than (i) a merger  or  consolidation
          which  would  result in the individuals who  prior  to  such
          merger or consolidation constitute the Board constituting at
          least  two-thirds  (2/3) of the board of  directors  of  the
          Company  or  the surviving or succeeding entity  immediately
          after  such  merger or consolidation, or (ii)  a  merger  or
          consolidation  effected to implement a  recapitalization  of
          the  Company  (or  similar transaction) in which  no  Person
          acquires more than 20% of the combined voting power  of  the
          Company's then outstanding securities; or
          
                2.   the shareholders of the Company approve a plan of
          complete liquidation of the Company; or
          
                3.    the  shareholders  of  the  Company  approve  an
          agreement for the sale or disposition by the Company of  all
          or substantially all the Company's assets, other than a sale
          or  disposition  which would result in the  individuals  who
          prior  to  such  sale  or disposition constitute  the  Board
          constituting  at  least two-thirds (2/3)  of  the  board  of
          directors  of the Person purchasing such assets  immediately
          after such sale or disposition.
          
     For  purposes  of  the Plan, "Beneficial Owner"  shall  have  the
     meaning  defined in Rule 13d-3 under the Securities Exchange  Act
     of  1934, as amended (the "Exchange Act") and "Person" shall have
     the  meaning  given in Section 3(a)(9) of the  Exchange  Act,  as
     modified and used in Sections 13(d) and 14(d) thereof; however, a
     Person shall not include (i) the Company, (ii) a trustee or other
     fiduciary  holding securities under an employee benefit  plan  of
     the  Company, (iii) an underwriter temporarily holding securities
     pursuant to an offering of such securities, or (iv) a corporation
     owned, directly or indirectly, by the shareholders of the Company
     in  substantially  the  same proportions as  their  ownership  of
     shares of the Company.

                                 ARTICLE V
                        DESIGNATION OF BENEFICIARY

     5.1  General.  Beneficiary shall mean the person or persons designated
by  a Participant in writing, in a form acceptable to the Administrator, to
receive  benefits  in  the  event  of  the  Participant's  death.   Such  a
designation may be revoked in writing by the Participant at any  time,  and
the  last  such designation executed by the Participant and filed with  the
Administrator shall control.  A Participant may, by completing  and  filing
with  the  Administrator  a  form provided by  the  Administrator  for  the
purpose, waive entirely his right to designate a Beneficiary hereunder,  or
irrevocably assign such right to either the Company or the Beneficiary.

      5.2   Plan  Designations.  If there is no designated  Beneficiary  to
receive any amount that becomes payable to a Beneficiary, or in the event a
designated  Beneficiary  has  predeceased  the  Participant,  or   if   the
Participant  designated distribution according to the  Plan  ("Per  Plan"),
such balance shall be paid in equal shares to the person or persons in  the
first surviving class of the following classes of preference Beneficiaries:

           (a)   Participant's surviving spouse,  with  a  balance  of
     payments  that may be payable in the event that the  spouse  dies
     before  the end of the fixed payment period, to be paid in  order
     of  preference  to those designated in classes (b),  (c)  or  (d)
     hereafter,  or as my spouse may validly designate during  his  or
     her lifetime,
     
           (b)   Participant's  surviving  issue,  (including  legally
     adopted issue), per stirpes and not per capita,
     
          (c)  Participant's surviving parents,
     
          (d)  Participant's estate.

      5.3   Interpretations.   Any ambiguity in the interpretation  of  the
Beneficiary designation shall be determined by the Administrator.

                                ARTICLE VI
                                  CLAIMS

      A  Participant or Beneficiary who has become entitled to Benefits and
who wishes payment to commence shall submit a claim to the Administrator in
writing, in such form and with such supporting documents and authorizations
as  the  Administrator may require.  If a Participant's or a  Beneficiary's
claim for benefits is denied in whole or in part, he shall be entitled to a
written  explanation  form  the Administrator setting  forth  the  specific
reasons  for the denial, and to a full and fair review by the Administrator
of the decision denying the claim.

                                ARTICLE VII
                        EXCLUSIONS AND LIMITATIONS

     7.1  General.  No benefits shall be payable under the Plan:

           (a)   on account of a Participant's death by suicide within
     two (2) years of his entry into the Plan, or
     
           (b)   to a Participant (or his Beneficiary) within two  (2)
     years  after  the  Participant has materially misrepresented  the
     state  of  his health or safety to the Company, or to  any  party
     designated by the Company, on the occasion of his entry into  the
     Plan.

      In  the case of a Participant who has become eligible for an increase
in benefits under Section 3.3, no such increase shall apply:

           (a)   in the event of the Participant's suicide within  two
     (2) years after such increase becomes effective, or
     
           (b)   within  two  (2)  years following  the  Participant's
     material  misrepresentation of the state of his health or  safety
     to the Company, or to any party designated by the Company, on the
     occasion of his becoming eligible for an increase in benefits.

     No benefits shall be payable to a Participant (or his Beneficiary) who
has  materially  misrepresented  his age to  the  Company,  except  as  the
Administrator shall authorize in its sole discretion.

      7.2   Benefits as stated in Executed Certificate.  No benefits  shall
apply  to a terminated Participant except as shall be set forth in a  valid
Executed  Certificate  of Eligibility issued to him by  the  Administrator,
according to such reasonable rules and procedures as the Administrator  may
establish.

      7.3   Employee  Cooperation.  The right of any Eligible  Employee  to
participate  in the Plan is conditioned upon and subject to his cooperation
with  the efforts of the Administrator to determine the state of his health
and safety.

                               ARTICLE VIII
                            GENERAL PROVISIONS

      8.1  Obligation of the Company.  Benefits under the Plan will be paid
solely from the general assets of the Company.  No funds or assets will  be
segregated or set aside by the Company for the payment of benefits, and  no
trust or escrow of any kind will be created with respect to the Plan by the
Company.

      8.2   Amendments  or  Termination.   This  Plan  may  be  amended  or
terminated at any time by affirmative vote of the Board of Directors of the
Company;  provided, however, that such amendment or termination  shall  not
effect  any  Participant's right to benefits which  arises  prior  to  such
amendment or termination.


      This Plan, as revised, has been executed on the behalf of the Company
on the 2nd day of January, 1997.


                         NORTHWESTERN PUBLIC SERVICE COMPANY

                         By  /s/ Merle D. Lewis
                         _____________________________________
                              Merle D. Lewis, President & CEO