MINNESOTA POWER INC
11-K, 1998-06-24
ELECTRIC & OTHER SERVICES COMBINED
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<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 11-K



(Mark One)

/X/   Annual Report Pursuant to Section 15(d) of the Securities Exchange Act 
      of 1934

For the fiscal year ended DECEMBER 31, 1997

                                       or

/ /   Transition Report Pursuant to Section 15(d) of the Securities Exchange 
      Act of 1934

For the transition period from        to
                               ------    ------



                           Commission File No. 1-3548




                    MINNESOTA POWER AND AFFILIATED COMPANIES
                          SUPPLEMENTAL RETIREMENT PLAN
                            (Full Title of the Plan)

                          ------------------------------

                              Minnesota Power, Inc.
                             30 West Superior Street
                             Duluth, Minnesota 55802

                          (Name of issuer of securities
                          held pursuant to the Plan and
                          the address of its principal
                                executive office)

                          ------------------------------


<PAGE>



                                      INDEX


                                                                           Page

Report of Independent Accountants                                            1

Statement of Net Assets Available for Plan Benefits                          2

Statement of Changes in Net Assets Available for Plan Benefits               3

Notes to Financial Statements                                                4

Supplemental Schedules

  Schedule I:  Investments Held                                             13

  Schedule II: Transactions in Excess of 5% of Fair Value of Plan Assets    14

Signatures                                                                  15



<PAGE>
    Price Waterhouse LLP     3100 Multifoods Tower        Telephone 612-332-7000
                             33 South Sixth Street        Facsimile 612-332-6711
                             Minneapolis, MN 55402-3795


Price Waterhouse                                          [LOGO]


                        REPORT OF INDEPENDENT ACCOUNTANTS


To the Participants and Administrator
of the Minnesota Power and Affiliated
Companies Supplemental Retirement Plan


In our opinion,  the  accompanying  statements of net assets  available for plan
benefits and the related  statements of changes in net assets available for plan
benefits present fairly, in all material respects,  the net assets available for
plan  benefits of the  Minnesota  Power and  Affiliated  Companies  Supplemental
Retirement  Plan at December  31,  1997 and 1996,  and the changes in net assets
available  for plan  benefits  for the years  then  ended,  in  conformity  with
generally accepted  accounting  principles.  These financial  statements are the
responsibility  of the Plan's  management;  our  responsibility is to express an
opinion on these  financial  statements  based on our audits.  We conducted  our
audits of these  statements  in  accordance  with  generally  accepted  auditing
standards which require that we plan and perform the audit to obtain  reasonable
assurance   about  whether  the  financial   statements  are  free  of  material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the  amounts  and  disclosures  in  the  financial  statements,   assessing  the
accounting  principles  used and significant  estimates made by management,  and
evaluating the overall  financial  statement  presentation.  We believe that our
audits provide a reasonable basis for the opinion expressed above.

Our audit was made for the purpose of forming an opinion on the basic  financial
statements taken as a whole. The additional  information included in Schedules I
and II is presented  for purposes of  additional  analysis and is not a required
part of the basic financial statements but is additional information required by
the Employee  Retirement  Income Security Act of 1974. Such information has been
subjected to the auditing procedures applied in the audit of the basic financial
statements  and, in our opinion,  is fairly  stated in all material  respects in
relation to the basic financial statements taken as a whole.


PRICE WATERHOUSE LLP

Price Waterhouse LLP
Minneapolis, Minnesota
June 5, 1998

                                       1
<PAGE>


                    MINNESOTA POWER AND AFFILIATED COMPANIES
                          SUPPLEMENTAL RETIREMENT PLAN
               STATEMENT OF NET ASSETS AVAILABLE FOR PLAN BENEFITS
                                    Thousands


                                                               DECEMBER 31,
                                                            1997         1996
- --------------------------------------------------------------------------------
ASSETS

     INVESTMENTS, AT FAIR/CONTRACT VALUE

         Guaranteed investment contracts                 $ 18,405     $ 17,287

         Minnesota Power, Inc. common stock                17,929       11,248

         Mutual fund securities                            39,590       30,497

         Money market securities                               54          110

         Loans receivable from participants                 1,882        1,548
                                                         --------     --------

              Total investments                            77,860       60,690

     CASH                                                      11            -
                                                         --------     --------

NET ASSETS AVAILABLE FOR PLAN BENEFITS                   $ 77,871     $ 60,690
                                                         ========     ========








- --------------------------------------------------------------------------------

        The accompanying notes are an integral part of these statements.



                                       2
<PAGE>


                    MINNESOTA POWER AND AFFILIATED COMPANIES
                          SUPPLEMENTAL RETIREMENT PLAN
         STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR PLAN BENEFITS
                                    Thousands


                                                                YEAR ENDED
                                                               DECEMBER 31,
                                                             1997        1996
- --------------------------------------------------------------------------------

SOURCES OF NET ASSETS

     Participant contributions                            $  5,594     $ 5,454

     Interest income                                         1,167       1,132

     Dividend income                                         3,431       3,829

     Net unrealized appreciation
         (depreciation) in aggregate
         fair value of securities                            9,470         (65)

     Participants' loan interest income                        150         127

     Net realized gain (loss) on sale of securities            374         (95)
                                                          --------     -------

                                                            20,186      10,382
APPLICATION OF NET ASSETS

     Transfers to retirement plans                            (624)       (184)

     Benefit distributions                                  (2,372)     (2,485)

     Administrative expenses                                    (9)         (9)
                                                          --------     -------

INCREASE IN NET ASSETS                                      17,181       7,704

NET ASSETS AVAILABLE FOR PLAN BENEFITS

     Beginning of year                                      60,690      52,986
                                                          --------     -------

     End of year                                          $ 77,871     $60,690
                                                          ========     =======







- --------------------------------------------------------------------------------

        The accompanying notes are an integral part of these statements.



                                       3
<PAGE>


                    MINNESOTA POWER AND AFFILIATED COMPANIES
                          SUPPLEMENTAL RETIREMENT PLAN
                          NOTES TO FINANCIAL STATEMENTS


NOTE 1 - DESCRIPTION OF THE PLAN

         The Minnesota Power and Affiliated  Companies  Supplemental  Retirement
Plan (the SRP) provides benefits for eligible employees of Minnesota Power, Inc.
(Minnesota  Power),  formerly  Minnesota Power & Light Company;  Superior Water,
Light and Power Company; and MP Water Resources Group, Inc.  (collectively,  the
Companies).  The SRP is a  defined  contribution  plan  that is  subject  to the
provisions of the Employee Retirement Income Security Act of 1974 (ERISA).


CONTRIBUTIONS

         Contributions to the SRP consist of the following:

         -  Flexible Dollars  Contributions.  Flexible dollar contributions for
            the non-union participants are up to 3 percent of each participant's
            compensation (0.2 percent for union  participants),  up to a maximum
            compensation  of $160,000 in 1997. The  contribution  is equal to an
            amount the participant has elected to contribute to the SRP.

         -  Salary   Reduction   Contributions   (Before-Tax    Contributions).
            Before-tax  contributions  for the union and non-union  participants
            are up to 12  percent  of each  participant's  compensation,  not to
            exceed  $9,500 in 1997,  as permitted  under  Section  401(k) of the
            Internal  Revenue Code of 1986 (Code).  The contribution is equal to
            an  amount  the  participant  has  elected  to  reduce  his  or  her
            compensation pursuant to a salary reduction agreement.

          - Results Sharing  Contributions.  Results sharing  contributions are
            equal to the  portion (up to 100  percent)  of the  Results  Sharing
            Award the Participant irrevocably agrees to forgo and that, pursuant
            to the Minnesota Power Results Sharing  Program,  would otherwise be
            paid to the Participant.  Results sharing contributions are included
            in the Participant's before-tax account, thus subject to limitations
            under Section 401(k) of the Code.

          - Voluntary Contributions (After-Tax Contributions). Each participant
            is also allowed to make voluntary after-tax contributions to the SRP
            through  payroll   deductions  or  lump-sum   contributions.   Total
            voluntary  contributions  made by a participant for all fiscal years
            since July 1, 1980 shall not  exceed  8.5  percent of the  aggregate
            compensation  received  for all years since  becoming a  participant
            less the  amount  of  voluntary  contributions  made to  either  the
            Minnesota Power and Affiliated  Companies  Retirement Plan A or Plan
            B.

          - Rollovers.  Contributions by participants  may also be made through 
            rollovers from other  qualified plans.

          - Core Contributions.  Core contributions  were made to  the SRP prior
            to   January   1,  1989  and  were   based  on  each   participant's
            compensation. Core contributions have not been made to the SRP since
            December 31, 1988.


VESTING

         All   contributions   plus  actual   earnings   are  fully  vested  and
nonforfeitable.


                                       4
<PAGE>

LOAN PROGRAM

         The SRP allows participants to borrow money from their SRP accounts.  A
participant  may  borrow up to $50,000  or 50  percent  of their  total  account
balances, whichever is less, for up to 5 years for a general purpose loan and 10
years for the acquisition of a primary  residence.  A fixed interest rate of the
prime  rate plus 1  percent,  but not less than the  Minnesota  Power  Employees
Credit Union share secured  rate, is charged until the loan is repaid.  As loans
are  repaid,   principal  and  interest   amounts  are   redeposited   into  the
participant's SRP accounts.


PARTICIPANT ACCOUNTS

         Each   participant's   account  is  credited  with  the   participant's
contribution  and their share of the Companies'  contributions.  Income from the
SRP's  investment  funds is allocated to each  participant's  account based upon
their ownership interest in each fund.

         Every  December  participants  are  required  to make an election as to
contributions  to the SRP for the  subsequent  year.  Funds  may be  transferred
between  investment options once a month with at least 10 days written notice to
the Employee Benefit Plans Committee (the Committee). A brief description of the
Plan's investment options follows.  For a detailed description of the investment
options and respective risk profiles refer to the fund prospectus.

          - Minnesota  Power Common Stock Fund seeks  capital  appreciation  and
            current income by investing in the common stock of Minnesota Power.

          - Heartland  Value  Fund  seeks  long-term  capital   appreciation  by
            investing  primarily in equity  securities of small  companies  with
            market  capitalization of less than $500 million selected on a value
            basis.

          - Fidelity  Magellan Fund seeks capital  appreciation  by investing in
            securities of domestic, foreign and multinational issuers.

          - Vanguard  Institutional  Index  Fund  seeks to match,  as closely as
            possible,  the  performance  of the Standard & Poor's 500  Composite
            Stock Price Index, which invests in stocks of large U.S. companies.

          - Vanguard  Short Term  Federal  Portfolio  invests  primarily in U.S.
            Government agency  securities,  which are debt obligations issued or
            guaranteed by agencies or  instrumentalities of the U.S. Government.
            This fund may also invest in U.S. Treasury securities, as well as in
            repurchase agreements collateralized by the United States.

          - BlackRock  Funds Small Cap Growth Equity  Portfolio  seeks small cap
            stocks  considered  to have  favorable  and  above-average  earnings
            growth  prospects  versus the fund's  benchmark,  the  Russell  2000
            Growth Index. This fund replaced IAI Emerging Growth Fund in 1997.

          - Templeton  Institutional  Funds,  Inc.  Foreign  Equity Series seeks
            long-term  capital  growth  through a flexible  policy  investing in
            equity  securities and debt obligations of companies and governments
            outside the United  States.  This fund  replaced  IAI  International
            Developed Market Fund in 1997.

          - Templeton  Institutional  Funds,  Inc.  Emerging Market Series seeks
            long-term capital growth by investing primarily in equity securities
            of issuers in countries having emerging markets.

          - Janus Balanced Fund seeks long-term  capital growth  consistent with
            preservation  of capital and balanced by current  income.  This fund
            invests in securities  selected primarily for their growth or income
            potential. This fund replaced the Fidelity Balanced Fund in 1997.

          - Fixed  Income Fund is a  conservative  fund  consisting  entirely of
            guaranteed  investment  contracts  (GICs) with insurance  companies.
            Each  GIC  is  guaranteed  by  the  issuing  insurance  company  and
            supported  by the  insurance  industry,  and not  guaranteed  by the
            federal government.

                                       5

<PAGE>

         While  participants are active employees,  they may withdraw money as a
loan from their core, flexible dollar or before-tax accounts.  After age 59 1/2,
participants  may withdraw  the full amount of their  flexible  dollar  account,
before-tax  account and their core account.  After-tax accounts may be withdrawn
at specified times during the year by participants of any age. When participants
terminate  employment,  become disabled or die, they or their  beneficiaries may
elect to receive the vested  amount of all their SRP accounts.  Upon  retirement
participants  may elect to  transfer  the  vested  amount  of their SRP  account
balances to the Minnesota  Power and Affiliated  Companies  Retirement Plan A or
Plan B.

         Minnesota  Power  maintains  the  participants'  records  and  issues a
quarterly report to each participant showing the status of individual  accounts.
At December 31, 1997 there were 1,701 participants in the SRP.


ADMINISTRATION

         The SRP is administered by the Committee.  The address of the Committee
is 30 West Superior Street,  Duluth,  Minnesota 55802. The responsibility of the
Committee  includes the  determination of compliance with the SRP's  eligibility
requirements  as well as the  administration  and payment of  benefits  all in a
manner  consistent  with the terms of the SRP and applicable  law. The Committee
has the authority to designate  persons to carry out fiduciary  responsibilities
(other than trustee responsibilities) under the SRP. The Committee has the power
to appoint an investment manager or managers.  Administration  fees and expenses
of agents, outside experts, consultants, and investment managers are paid by the
Companies or the SRP. The Committee may from time to time establish,  modify and
repeal rules for the  administration of the SRP as may be necessary to carry out
the purpose of the SRP.  Members of the Committee  receive no  compensation  for
their services with respect to the SRP.

         As of June 1, 1998 the  members  of the  Committee,  all  employees  of
Minnesota Power, and their respective titles are as follows:

        Name                           Title
  --------------------     ------------------------------------
  Robert D. Edwards        Executive Vice President
                           President - Minnesota Power Electric (1)
  David G. Gartzke         Senior Vice President - Finance
                           Chief Financial Officer
  Roger P. Engle           Vice President - Minnesota Power Electric
                           President - Superior Water, Light and Power Company
  Philip R. Halverson      Vice President, General Counsel and Secretary
  Donald J. Shippar        Senior Vice President - Minnesota Power Electric
  Claudia S. Welty         Vice President - Minnesota Power Electric
  Mark A. Schober          Controller
  Lori A. Collard          President - Electric Outlet, Inc.
  Brenda J. Flayton        Director - Minnesota Power Electric - Human Resources
  Alan R. Hodnik           Manager - Laskin Energy Center
  Jeweleon W. Tuominen     Manager - Executive Compensation and Employee
                           Benefits

- ----------------------
(1) Committee Chairman

         North Shore Bank of Commerce is retained as Trustee  (Trustee)  for the
SRP. The Trustee's main office is located at 131 West Superior  Street,  Duluth,
Minnesota  55802. The Trustee carries blanket bond insurance in the amount of $2
million.

                                       6
<PAGE>

PLAN TERMINATION

         The  Companies  reserve the right to reduce,  suspend,  or  discontinue
their  contributions  at  any  time  or to  terminate  the  SRP  subject  to the
provisions  of ERISA and the Code. In the event of SRP  termination,  all of the
account  balances of the participants  will be fully vested and  nonforfeitable,
and distribution will be made in accordance with the terms of the SRP.



NOTE 2 - SUMMARY OF ACCOUNTING POLICIES

         The SRP uses the accrual basis of accounting and  accordingly  reflects
income in the year earned and expenses when incurred.

         Mutual funds,  money market securities and Minnesota Power common stock
are  reported  at fair value  based on quoted  market  prices.  GIC  amounts are
reported at contract  value which  represents the purchase price of the contract
plus  accrued  interest.   Participants'   loans  are  reported  at  cost  which
approximates fair value.

         The  preparation of financial  statements in conformity  with generally
accepted  accounting  principles  requires  management to (i) make estimates and
assumptions  that affect the reported  amounts of assets and  liabilities,  (ii)
disclose  contingent  liabilities  at the date of the financial  statements  and
(iii) report amounts of revenue and expense during the reporting period.  Actual
results could differ from those estimates.



NOTE 3 - FEDERAL INCOME TAX STATUS

         A favorable  determination  letter dated December 12, 1995 was obtained
from the Internal  Revenue Service stating that the SRP, as amended and restated
effective  January 1, 1992,  qualifies as a profit  sharing  plan under  Section
401(a) of the Code.


                                       7

<PAGE>


NOTE 4 - GUARANTEED INVESTMENT CONTRACTS

                                                  
                                                 Crediting     Fair/Contract
                                                 Interest          Value
                                                   Rate      1997        1996
- --------------------------------------------------------------------------------

Metropolitan Life Insurance Company
         due 1997                                  8.65%   $     -     $ 2,419
Protective Life Insurance Company
         due 1997                                  6.99%         -       1,576
Provident Life and Accident Insurance Company
         due 1998                                  7.06%     3,100       2,896
Allstate Life Insurance Company
         due 1998                                  7.14%     2,472       2,307
Aetna Life Insurance Company
         due 1999                                  6.06%     2,537       2,389
Provident Mutual Insurance Company
         due 1999                                  5.80%     2,014       1,903
SunAmerica Life Insurance Company
         due 2000                                  6.00%     2,028       1,913
Jackson National Life Insurance Company
         due 2000                                  6.30%     3,169           -
Commonwealth Life Insurance Company
         due 2001                                  6.67%     1,883       1,884
Protective Life Insurance Company
         due 2001                                  6.17%     1,202           -
                                                           -------     -------
                                                           $18,405     $17,287
                                                           =======     =======


Average yield                                                6.47%       6.87%


                                       8

<PAGE>

NOTE 5 - CHANGES IN SRP ASSETS FOR PARTICIPANT DIRECTED ACCOUNTS
Thousands
<TABLE>
         The  table  below  summarizes  the  changes  in  SRP  assets  for  each
investment fund for the year ended December 31, 1997.

<CAPTION>
                                             Fixed
                                            Income
                                             Fund                         Mutual Fund Securities
                                           --------    -----------------------------------------------------------
                                                                                Vanguard       Vanguard      IAI
                                                       Heartland  Fidelity    Institutional   Short Term  Emerging
                                                         Value    Magellan        Index        Federal     Growth
                                             GIC         Fund       Fund          Fund        Portfolio     Fund
<S>                                        <C>         <C>        <C>         <C>             <C>         <C>
Sources of net assets

   Participant contributions               $   709      $  742    $   591       $   931       $  125       $  534

   Interest income                           1,166 

   Dividend income                                         573        808           191           61           50

   Net unrealized appreciation
     (depreciation) in aggregate
     fair value of securities                              117      1,704         1,665            2

   Participants' loan repayments,
     including interest                        289          32         82            64            6           42

   Net gain (loss) on sale of securities                    53        208           127           (1)        (360)
                                           -------      ------    -------       -------       ------       ------
                                             2,164       1,517      3,393         2,978          193          266

Application of net assets

   Transfers to retirement plans              (624)

   Benefit distributions                      (861)       (101)      (300)         (165)         (58)         (33)

   Loans to participants                    (1,098)

   Administrative expenses                      (9)
                                           -------      ------    -------       -------       ------       ------   

Increase (decrease) in net assets             (428)      1,416      3,093         2,813          135          233

Net transfers                                1,527         397     (1,626)          236          (63)      (4,443)

Net assets available for plan benefits

   Beginning of year <F1>                   17,317       2,793     10,799         5,600          983        4,210
                                           -------      ------    -------       -------       ------       ------

   End of year <F2>                        $18,416      $4,606    $12,266       $ 8,649       $1,055       $    0
                                           =======      ======    =======       =======       ======       ======


                                       9

<PAGE>

<CAPTION>

                                          
                                                              Mutual Fund Securities (Continued)
                                          ---------------------------------------------------------------------------------
                                            BlackRock     IAI Int'l.    Templeton                              Templeton   
                                            Small Cap     Developed   Institutional    Fidelity    Janus     Institutional  
                                          Growth Equity    Market     Fund Foreign     Balanced   Balanced   Fund Emerging  
                                              Fund          Fund      Equity Series      Fund       Fund     Market Series 
                                          <C>             <C>         <C>              <C>        <C>        <C>            
<S>                                       
Sources of net assets                     
                                          
   Participant contributions                $  401         $  119        $    99                   $  743       $  335      
                                          
   Interest income                                                                                                          
                                          
   Dividend income                             235             39             76                      438          128      
                                          
   Net unrealized appreciation            
     (depreciation) in aggregate          
     fair value of securities                  (11)                         (133)                     148         (460)     
                                          
   Participants' loan repayments,         
     including interest                         24             10              8                       32           30      
                                          
   Net gain (loss) on sale of securities        (5)           111             (1)        $   70                     31      
                                            ------         ------        -------         ------    ------       ------      
                                               644            279             49             70     1,361           64      
                                          
Application of net assets                 
                                          
   Transfers to retirement plans                                                                                            
                                          
   Benefit distributions                       (33)           (33)           (24)           (10)     (160)         (69)     
                                          
   Loans to participants                                                                                                    
                                          
   Administrative expenses                                                                                                  
                                            ------         ------        -------         ------     -----       ------      
                                          
Increase (decrease) in net assets              611            246             25             60     1,201           (5)     
                                          
Net transfers                                4,119         (1,781)         1,751         (2,576)    3,079          172      
                                          
Net assets available for plan benefits    
                                          
   Beginning of year <F1>                        0          1,535              0          2,516         0        2,061      
                                            ------         ------        -------         ------    ------       ------      
                                          
   End of year <F2>                         $4,730         $    0        $ 1,776         $    0    $4,280       $2,228      
                                            ======         ======        =======         ======    ======       ======      


<CAPTION>


                                             Minnesota       Loans               
                                               Power       Receivable             
                                               Common         from         Total  
                                               Stock      Participants    Changes 
<S>                                           <C>         <C>             <C>                                  
Sources of net assets                                                             
                                                                                  
   Participant contributions                   $  265                     $ 5,594 
                                                                                  
   Interest income                                  1                       1,167 
                                                                                  
   Dividend income                                832                       3,431 
                                                                                  
   Net unrealized appreciation                                                    
     (depreciation) in aggregate                                                  
     fair value of securities                   6,438                       9,470 
                                                                                  
   Participants' loan repayments,                                                 
     including interest                           218        $ (687)          150 
                                                                                  
   Net gain (loss) on sale of securities          141                         374 
                                              -------        ------       ------- 
                                                7,895          (687)       20,186 
                                                                                  
Application of net assets                                                         
                                                                                  
   Transfers to retirement plans                                             (624)
                                                                                  
   Benefit distributions                         (448)          (77)       (2,372)
                                                                                  
   Loans to participants                                      1,098             0 
                                                                                  
   Administrative expenses                                                     (9)
                                              -------        ------       ------- 
                                                                                  
Increase (decrease) in net assets               7,447           334        17,181 
                                                                                  
Net transfers                                    (792)                          0 
                                                                                  
Net assets available for plan benefits                                            
                                                                                  
   Beginning of year <F1>                      11,328         1,548        60,690 
                                              -------        ------       ------- 
                                                                                  
   End of year <F2>                           $17,983        $1,882       $77,871 
                                              =======        ======       ======= 
- -------------------------
<FN>
<F1> Balances include $110 of short-term money market securities of which $80
     was being held to be invested in Minnesota Power Common Stock and the
     balance for participant distributions.

<F2> Balances include $54 of short-term money market securities of which $43 was
     being held to be invested in Minnesota Power Common Stock and the balance
     for participant distributions. Balances also include $11 in cash.
</FN>
</TABLE>                                              
                                          
                                       10

<PAGE>

NOTE 5 - CHANGES IN SRP ASSETS FOR PARTICIPANT DIRECTED ACCOUNTS
Thousands
<TABLE>
         The  table  below  summarizes  the  changes  in  SRP  assets  for  each
investment fund for the year ended December 31, 1996.


<CAPTION>
                                              Fixed
                                              Income
                                               Fund                          Mutual Fund Securities
                                             --------         ----------------------------------------------------
                                                                                            Vanguard     Vanguard
                                                              Heartland       Fidelity   Institutional  Short Term
                                                                Value         Magellan       Index       Federal
                                               GICs             Fund            Fund         Fund       Portfolio
<S>                                          <C>              <C>             <C>        <C>            <C>    
Sources of net assets

   Participant contributions                 $    886          $   653        $   884       $   665        $ 191

   Interest income                              1,131

   Dividend income                                                 166          1,697           171           51

   Net unrealized appreciation
     (depreciation) in aggregate
     fair value of securities                                      159           (361)          647           (8)

   Participants' loan repayments,
     including interest                           272               18             90            49           17

   Net gain (loss) on sale of securities                            14           (175)           86           (2)
                                             --------          -------        -------       -------        -----
                                                2,289            1,010          2,135         1,618          249

Application of net assets

   Transfers to retirement plans                 (184)

   Benefit distributions                       (1,228)             (42)          (318)          (93)          (9)

   Loans to participants                         (742)

   Administrative expenses                         (9)
                                             --------          -------        -------       -------        -----

Increase (decrease) in net assets                 126              968          1,817         1,525          240

Net transfers                                     235              858         (1,335)          629          (40)

Net assets available for plan benefits

   Beginning of year <F1>                      16,956              967         10,317         3,446          783
                                             --------          -------        -------       -------        -----

   End of year <F2>                          $ 17,317          $ 2,793        $10,799       $ 5,600        $ 983
                                             ========          =======        =======       =======        =====


                                       11
<PAGE>



<CAPTION>
                                           
                                           
                                   
                                                 Mutual Fund Securities (Continued)
                                      ------------------------------------------------------------
                                         IAI      IAI Int'l.                   Templeton       Minnesota        Loans
                                      Emerging     Developed     Fidelity    Institutional       Power       Receivable
                                       Growth       Market       Balanced    Fund Emerging      Common          from         Total
                                        Fund         Fund          Fund      Market Series       Stock      Participants    Changes
<S>                                   <C>         <C>            <C>         <C>               <C>          <C>             <C>
Sources of net assets                 
                                   
   Participant contributions           $  706       $  287        $  451        $   315         $   416                     $ 5,454
                                   
   Interest income                                                                                    1                       1,132
                                   
   Dividend income                        583          157           108             49             847                       3,829
                                   
   Net unrealized appreciation     
     (depreciation) in aggregate   
     fair value of securities            (433)         (57)           99            206            (317)                        (65)
                                   
   Participants' loan repayments,  
     including interest                    42           15            26             23             212        $  (637)         127
                                   
   Net gain (loss) on sale of 
     securities                             7            8            (3)            19             (49)                        (95)
                                      -------       ------        ------        -------         -------        -------      -------
                                          905          410           681            612           1,110           (637)      10,382
                                   
Application of net assets          
                                   
   Transfers to retirement plans                                                                                               (184)
                                   
   Benefit distributions                 (100)         (65)          (27)           (76)           (457)           (70)      (2,485)
                                   
   Loans to participants                                                                                           742            0
                                   
   Administrative expenses                                                                                                       (9)
                                      -------       ------        ------        -------         -------        -------      -------
                                   
Increase (decrease) in net assets         805          345           654            536             653             35        7,704
                                   
Net transfers                             727           25          (184)           198          (1,113)                          0
                                   
Net assets available for plan 
     benefits     
                                   
   Beginning of year <F1>               2,678        1,165         2,046          1,327          11,788          1,513       52,986
                                      -------       ------        ------        -------         -------        -------      -------
                                   
   End of year <F2>                   $ 4,210       $1,535        $2,516        $ 2,061         $11,328        $ 1,548      $60,690
                                      =======       ======        ======        =======         =======        =======      =======
- ---------------------
<FN>
<F1> Balances include $1,642 of short-term money market securities of which
     $1,000 was being held to be invested in a new GIC on January 3, 1996 and
     the balance for participant distributions.

<F2> Balances include $110 of short-term money market securities of which $80
     was being held to be invested in Minnesota Power Common Stock and the
     balance for participant distributions.
</FN>
</TABLE>
                                                                              12
<PAGE>
<TABLE>

                                                                                                              Schedule I
                                        MINNESOTA POWER AND AFFILIATED COMPANIES
                                              SUPPLEMENTAL RETIREMENT PLAN
                                              SCHEDULE OF INVESTMENTS HELD
                                                   DECEMBER 31, 1997
                                                       Thousands
<CAPTION>

                                                                                                           Fair/
                                                                          Number of                      Contract
             Description                                                   Shares           Cost           Value
- ---------------------------------------------------------------------------------------------------------------------------
<S>                                                                       <C>           <C>             <C>   
Guaranteed Investment Contracts
     Provident Life and Accident Insurance Company
         7.06% due 1998                                                                 $   3,100       $  3,100
     Allstate Life Insurance Company
         7.14% due 1998                                                                     2,472          2,472
     Aetna Life Insurance Company
         6.06% due 1999                                                                     2,537          2,537
     Provident Mutual Insurance Company
         5.80% due 1999                                                                     2,014          2,014
     SunAmerica Life Insurance Company
         6.00% due 2000                                                                     2,028          2,028
     Jackson National Life Insurance Company
         6.30% due 2000                                                                     3,169          3,169
     Commonwealth Life Insurance Company
         6.67% due 2001                                                                     1,883          1,883
     Protective Life Insurance Company
         6.17% due 2001                                                                     1,202          1,202
                                                                                        ---------       --------
              Total guaranteed investment contracts                                        18,405         18,405
                                                                                        ---------       --------

Minnesota Power, Inc. Common Stock *                                          413          11,020         17,929
                                                                                        ---------       --------

Mutual Fund Securities
     Heartland Value Fund                                                     136           4,249          4,606
     Fidelity Magellan Fund                                                   129           9,304         12,266
     Vanguard Institutional Index Fund                                         97           6,245          8,649
     Vanguard Short Term Federal Portfolio                                    104           1,051          1,055
     BlackRock Small Cap Growth Equity Portfolio                              231           4,740          4,730
     Templeton Institutional Fund Foreign Equity Series                       102           1,910          1,776
     Janus Balanced Fund                                                      215           4,139          4,280
     Templeton Institutional Fund Emerging Market Series                      279           2,598          2,228
                                                                                        ---------       --------
              Total mutual funds                                                           34,236         39,590
                                                                                        ---------       --------

Money Market Securities
     Dreyfus Institutional Government Securities Fund,
         floating interest rate with no maturity date                                          54             54
                                                                                        ---------       --------

Loans Receivable from Participants * - 7% to 10%                                                -          1,882
                                                                                        ---------       --------

Total Investments                                                                       $  63,715        $77,860
                                                                                        =========        =======

- -----------------------
* Party-in-interest

The above data was prepared from information  certified as complete and accurate
by North Shore Bank of Commerce, the plan Trustee.

</TABLE>
                                       13
<PAGE>

                                                                  Schedule II

                    MINNESOTA POWER AND AFFILIATED COMPANIES
                          SUPPLEMENTAL RETIREMENT PLAN
                      SCHEDULE OF TRANSACTIONS IN EXCESS OF
                         5% OF FAIR VALUE OF PLAN ASSETS
                      FOR THE YEAR ENDED DECEMBER 31, 1997
                              Dollars in Thousands


                                    Purchases
- --------------------------------------------------------------------------------

                                              Aggregate Purchase
                                                Price and Fair
                                                   Value on           Number of
             Description                       Transaction Dates    Transactions
             -----------                      ------------------    ------------

Dreyfus Institutional Government Series            $7,232                246

BlackRock Small Cap Growth Equity Portfolio        $4,788                 14

BlackRock Small Cap Growth Equity Portfolio        $4,105                  1

Jackson National Life Insurance Company            $4,177                 12

Janus Balanced Fund                                $4,102                 33

Vanguard Institutional Index Fund                  $2,060                 37

Commonwealth Life Insurance Company                $1,716                 16

IAI Emerging Growth Fund                           $  785                 19





                                      Sales
- --------------------------------------------------------------------------------

                                              Aggregate
                                  --------------------------------
                                    Net
                                  Cost of       Sale        Gain/     Number of
     Description                   Asset        Price      (Loss)   Transactions
     -----------                  -------     --------    --------  ------------

Dreyfus Institutional 
  Government Series                $7,260      $7,260          0        162

IAI Emerging Growth Fund           $4,830      $4,685      $(145)        26

IAI Emerging Growth Fund           $4,108      $4,105      $  (3)         1

Commonwealth Life Insurance
  Company                          $1,844      $1,844          0         14

Jackson National Life 
  Insurance Company                $1,077      $1,077          0         11

Vanguard Institutional
  Index Fund                       $  998      $1,000      $   2         39

Janus Balanced Fund                $  408      $  408          0         29

BlackRock Small Cap Growth 
  Equity Portfolio                 $  286      $  281      $  (5)        12


- ------------------
The above data was prepared from information  certified as complete and accurate
by North Shore Bank of Commerce, the plan Trustee.

                                       14
<PAGE>


                                   SIGNATURES

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the Employee  Benefit  Plans  Committee has duly caused this annual report to be
signed on its behalf by the undersigned hereunto duly authorized.


                                      Minnesota Power and Affiliated Companies
                                           Supplemental Retirement Plan
                                      ----------------------------------------
                                                 (Name of Plan)


June 24, 1998                      By               R.D. Edwards
                                      ----------------------------------------
                                                    R.D. Edwards
                                                      Chairman,
                                            Employee Benefit Plans Committee


                                       15
<PAGE>


                                INDEX TO EXHIBITS


Exhibit
- -------

     a   -    Consent of Independent Accountants



<PAGE>


                                                                      Exhibit a



                       CONSENT OF INDEPENDENT ACCOUNTANTS



We  hereby  consent  to the  incorporation  by  reference  in  the  Registration
Statement on Form S-8 (No.  333-26755)  of the  Minnesota  Power and  Affiliated
Companies  Supplemental  Retirement  Plan  of our  report  dated  June  5,  1998
appearing on page 1 of this Annual Report of the Minnesota  Power and Affiliated
Companies Supplemental  Retirement Plan on Form 11-K for the year ended December
31, 1997.


PRICE WATERHOUSE LLP

Price Waterhouse LLP
Minneapolis, Minnesota
June 24, 1998




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