BLACK HILLS CORP
8-K, 1994-09-12
ELECTRIC SERVICES
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                   SECURITIES AND EXCHANGE COMMISSION

                         Washington, D. C. 20549



                                 Form 8-K



                              CURRENT REPORT


                     Pursuant to Section 13 or 15(d) of
                    THE SECURITIES EXCHANGE ACT OF 1934


                  Date of Report:  September 12, 1994





                          BLACK HILLS CORPORATION



State of South Dakota       File Number 1-7978       IRS Number 46-0111677





                               625 Ninth Street
                        Rapid City, South Dakota  57709



                 Registrant's telephone number (605) 348-1700

<PAGE>
Item 5.     Other Events

     On September 9, 1994, Black Hills Corporation ("Company") entered into
a Power Integration Agreement with Montana-Dakota Utilities Co., a Division
of MDU Resources Group, Inc. ("MDU").  The Agreement provides that for a
period of 10 years commencing January 1, 1997, the Company will supply all
electric power and energy required by MDU for its electric service area in
and around Sheridan, Wyoming.  MDU's Sheridan service area has experienced
a 45 MW peak and a load factor of approximately 60 percent.  The Company
has experienced a 284 MW peak for its entire system.
     The agreement is subject to the approval of the Federal Energy
Regulatory Commission.  MDU awarded the agreement to the Company after an
extensive open competitive proposal process.
     The agreement further provides that the Company and MDU will share
equal ownership in a combustion turbine to be constructed at such time as
the Company's system will require a new peaking resource.  Both companies
will receive the benefit of lower unit costs from a turbine that will be
larger than either company could justify on its own.
     Because the Company will be able to serve the Sheridan load without
constructing additional facilities on which to earn a return, the Company
believes that the sale will not have a direct significant impact on
earnings.  However, because the additional 45 MW load will allow the
Company to operate more efficiently, the Company anticipates that the sale
will require lower rate increases in late 1995 when the Company completes
Neil Simpson Unit #2, an 80 MW coal-fired electric generating plant ("NS
#2") now under construction near Gillette, Wyoming.   The Company believes
that the timing of the sale to commence shortly after NS #2 goes into
operation and the 10-year term will allow the Company to place NS #2 into
rate base as a base load plant with less risk of regulators disallowing a
portion of the new plant.
     The Company believes that being able to successfully compete for sales
such as the MDU Sheridan load further positions the Company to continue to
be more competitive in an emerging open wholesale power market.
     Attached is a copy of the news release released September 9, 1994.


Item 7.

     (c)  Exhibits.

     The following Exhibits are filed as a part of this report and as 

Exhibits to the Registration Statement on S-3 (Registration No. 33-54329):

          Exhibit 10(gg)    Power Integration Agreement, dated September 9,
                            1994, between the Company and Montana-Dakota 
                            Utilities Co., a Division of MDU Resources      
                            Group, Inc.

          Exhibit 99        News Release dated September 9, 1994.



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

                                        BLACK HILLS CORPORATION



                                        By /s/ DALE E. CLEMENT             
                                           Dale E. Clement, Senior Vice 
                                                President - Finance


Dated:  September 12, 1994

                    POWER INTEGRATION AGREEMENT

     This Power Integration Agreement, dated as of September 9,
1994, is entered into by and between BLACK HILLS CORPORATION, a
South Dakota corporation, doing business as Black Hills Power and
Light Company, and Montana-Dakota Utilities Co., a Division of
MDU RESOURCES GROUP, INC., a Delaware corporation.

     1.   RECITALS AND DEFINITIONS.

          1.1  Definitions.  The following capitalized words and
     phrases when used in this Agreement shall have the respective
     meanings as follows:

          "Agreement" is this Power Integration Agreement
     including all exhibits attached hereto.

          "Annual Fixed Costs" of either party are the levelized
     fixed costs as determined under Exhibit A.

          "BHC" is Black Hills Corporation, a South Dakota
     corporation, doing business as Black Hills Power and Light
     Company.

          "BHC Furnished Capacity" is 60 percent of the peak load
     of the MDU Sheridan Service Territory during each calendar month
     of the Service Term.

          "Black Hills' System" has the same meaning as set forth
     in the Pacific Contract and, pursuant to this Agreement, also
     includes a Black Hills contracted transmission path from
     Pacific's System to the Pacific/MDU Interconnection.

          "Combustion Turbine" is a combustion turbine to be
     fired either with fuel oil and/or natural gas of an approximate
     name plate size of 70 MW to be constructed at a time and place as
     provided at Section 3.1 and the CT Agreement.

          "Commercial Date" is the date the Combustion Turbine is
     in commercial operation under Prudent Utility Practice.  The
     Commercial Date shall be the first day of a calendar month.

          "CT Agreement" is the Construction, Ownership and
     Operating Agreement between BHC and MDU, a copy of which is
     attached as Exhibit B.

          "CT Term" is a period of time commencing with the
     Commercial Date and terminating ten years thereafter.

          "FERC" is the Federal Energy Regulatory Commission of
     the United States.

          "MDU" is Montana-Dakota Utilities Co., a Division of
     MDU Resources Group, Inc., a Delaware corporation.

          "MDU Furnished Capacity" is 40 percent of the peak load
     of the MDU Sheridan Service Territory during each calendar month
     of the Service Term.

          "MDU Sheridan Service Territory" is MDU's existing
     service territory in the City of Sheridan and Sheridan County,
     Wyoming as it exists at this time and includes any modifications
     thereof during the Service Term.

          "Notice of Intent to Construct" is the notice to be
     given under Section 3.1 of this Agreement.

          "Pacific" is PacifiCorp, an Oregon corporation.

          "Pacific Contract" is the Power Sales Agreement, dated
     as of the 31st day of December, 1983, entered into by and between
     Pacific and BHC as may be amended from time to time.  The Pacific
     Contract expires December 31, 2023.

          "Pacific/MDU Interconnection" is the interconnection
     where Pacific delivers electric energy from Pacific's System at
     230 kV to MDU's 230/46 kV substation situated in Sheridan County,
     Wyoming.

          "Prudent Utility Practice" at any particular time means
     either (a) any of the practices, methods and acts engaged in or
     approved by a significant portion of the electric utility
     industry prior thereto or (b) any of the practices, methods or
     acts, which, in the exercise of reasonable judgment in the light
     of the facts known at the time the decision was made, could have
     been expected to accomplish the desired result at the lowest
     reasonable cost consistent with reliability, safety and
     expedition.  Prudent Utility Practice is not intended to be
     limited to the optimum practice, method or act, to the exclusion
     of all others, but rather to be a spectrum of possible practices,
     methods or acts.  Prudent Utility Practice shall also include
     those practices, methods and acts that are required by applicable
     laws and final orders or regulations of regulatory agencies
     having jurisdiction.

          "Remaining CT Term" is that period of time commencing
     at the end of the Service Term and ending on the last day of the
     CT Term.

          "Service Term" shall commence at 12:00 a.m. on January
     1, 1997 and shall terminate at 12:00 midnight on December 31,
     2006.

          "Term" means the same as defined in the CT Agreement.

     Other capitalized terms and phrases used in this Agreement that
     are not otherwise defined herein but are defined in the CT
     Agreement shall have the meaning as set forth in the CT
     Agreement.  

          1.2  Recitals.  During the Service Term, MDU requires a
     supply of electric capacity and energy to serve the needs of its
     electric retail customers in its MDU Sheridan Service Territory. 
     BHC will have system energy and capacity available to meet MDU's
     requirements, but BHC anticipates that Black Hills' System will
     at some future time require a combustion turbine as an additional
     peaking resource.  MDU desires to participate in the construction
     of the Combustion Turbine to meet the capacity requirements of
     its MDU Sheridan Service Territory at such time BHC's integrated
     resource planning requires the Combustion Turbine in its
     resources.  The parties enter into this Agreement to integrate
     resources of Black Hills' System and the MDU Sheridan Service
     Territory by providing from Black Hills' System the capacity and
     energy requirements of MDU and, at such time the Combustion
     Turbine is constructed, by providing capacity for MDU from MDU's
     interest in the Combustion Turbine.

     2.   DELIVERY OF CAPACITY AND ENERGY.

          2.1  System Capacity and Energy.  During the Service
     Term, BHC shall provide and MDU shall acquire at 230 kV all of
     the electric capacity and energy requirements to serve MDU's
     retail customers in the MDU Sheridan Service Territory except
     where MDU purchases capacity and associated energy in excess of
     55 megawatts as provided at Section 4.6.

          2.2  Points of Delivery.  By scheduling capacity and
     energy under the Pacific Contract, BHC shall cause Pacific to
     deliver at no wheeling charge to MDU all of the MDU capacity and
     energy requirements as set forth in Section 2.1 over Pacific's
     System to the Black Hills' System at the Pacific/MDU
     Interconnection.

          2.3  Control Area Services.  BHC shall be responsible
     for area control service to the MDU Sheridan Service Territory at
     no cost to MDU.  BHC will provide, at no cost to MDU, telemetry
     equipment and a communication channel from the Pacific/MDU
     Interconnection to BHC's system control.  All costs incurred by
     BHC to provide control area services, including, but not limited
     to, load following, telemetry, regulation, reserves, and control
     area accounting, shall be paid by BHC.

          2.4  Sheridan-Johnson REA.  Deliveries of electric
     power and energy for Sheridan-Johnson Rural Electrification
     Association ("Sheridan-Johnson") at the Pacific/MDU
     Interconnection shall not be included in determining deliveries
     to MDU under Section 4.0, nor shall transformer and distribution
     line losses incurred between the Sheridan-Johnson meters on MDU's
     system and the Pacific/MDU Interconnection be included in
     determining deliveries to MDU.

          2.5  Monthly Accounting.  MDU shall read meters at the
     Pacific/MDU Interconnection and provide a printout of all data
     required by BHC.  Meters shall be read and such data shall be
     supplied to BHC on a timely basis in coordination with the
     Western Area Power Administration schedule in Wyoming.

     3.   COMBUSTION TURBINE.

          3.1  Time and Place of Construction of Combustion
     Turbine.  At its sole discretion, BHC shall determine the time
     and the place of the construction of the Combustion Turbine as
     provided in the CT Agreement; provided, the place of construction
     shall be within BHC's service territory as it exists on the date
     of this Agreement, or within a 20-mile radius thereof, or MDU
     Sheridan Service Territory.  At such time BHC has made the
     decision to accept proposals for the construction of the
     Combustion Turbine, BHC shall give MDU a written Notice of Intent
     to Construct disclosing the place of the construction of the
     Combustion Turbine and the estimated Commercial Date of the
     Combustion Turbine.  The period of time between the Notice to
     Construct and the estimated Commercial Date shall be at least 24
     months.  While BHC anticipates the need for the Combustion
     Turbine before the end of the Service Term, BHC reserves the
     right in its sole discretion to determine that the Combustion
     Turbine is not needed and will not be constructed during the
     Service Term.  BHC further reserves the right to construct
     combustion turbines at any time at locations other than those
     locations specified in the first sentence of this Section 3.1;
     and in that event, none of such turbines shall constitute the
     Combustion Turbine described in this Agreement.

          3.2  Ownership Interest in Combustion Turbine.  If the
     Commercial Date is scheduled during the Service Term, MDU and BHC
     shall each acquire and own an undivided 50 percent interest in
     the Combustion Turbine.

          3.3  Use of Turbine Output.  Operation, control and use
     of the output of the Combustion Turbine is set forth in the CT
     Agreement.

     4.   PRICES AND PAYMENTS.

          4.1  Payments for BHC Furnished Capacity.  For the BHC
     Furnished Capacity MDU shall pay BHC monthly the following rates:
    
<PAGE>
                           Capacity Charge
          Calendar Year         ($KW/Mo)

          1997                  13.60
          1998                  13.70
          1999                  13.80
          2000                  13.90
          2001                  14.00
          2002                  14.10
          2003                  14.20
          2004                  14.30
          2005                  14.40
          2006                  14.50

          4.2  Payments for MDU Furnished Capacity.  Prior to the
     Commercial Date, MDU shall pay BHC monthly the following rates
     for the MDU Furnished Capacity:

                             Capacity Charge
          Calendar Year         ($KW/Mo)

          1997                  5.461
          1998                  5.468
          1999                  5.477
          2000                  5.485
          2001                  5.493
          2002                  5.502
          2003                  5.511
          2004                  5.520
          2005                  5.529
          2006                  5.539

     After the Commercial Date, MDU Furnished Capacity shall be deemed
     furnished from MDU's ownership interest in the Combustion
     Turbine.

          4.3  Fixed Cost Payments and Operating Expenses for
     Combustion Turbine During Service Term.  Commencing on the
     Commercial Date and continuing for the balance of the Service
     Term, the following payments shall be made each month:

               (a)  If the name plate megawatts in the Combustion
     Turbine owned by MDU are in excess of MDU Furnished Capacity for
     that month, BHC shall pay MDU one-twelfth of MDU's Annual Fixed
     Costs per megawatt for such excess megawatts.

               (b)  If the name plate megawatts in the Combustion
     Turbine owned by MDU are less than MDU Furnished Capacity for
     that month, MDU shall pay to BHC one-twelfth of BHC's Annual
     Fixed Costs per megawatt for such deficiency.

               (c)  BHC shall pay all Operating Expenses and Fuel
     Costs of the Combustion Turbine during the Service Term.
 
               (d)  The CT Agreement in Section 5 thereof sets
     forth the responsibility for the Operating Expenses and Fuel
     Costs following the Service Term.

          4.4  Payments for Energy.  For all energy delivered to
     serve the MDU Sheridan Service Territory during the Service Term,
     MDU shall pay BHC monthly the following megawatthour rates:

                             Energy Charge
          Calendar Year         ($/MWh)

          1997                  15.66
          1998                  16.28
          1999                  16.94
          2000                  17.61
          2001                  18.32
          2002                  19.05
          2003                  19.81
          2004                  20.61
          2005                  21.43
          2006                  22.29

          4.5  New Direct Taxes Adjustment.  If BHC experiences
     increased costs during the Service Term from its generating
     facilities and power and energy purchase contracts, as such
     facilities and contracts exist from time to time, due to new
     legislation adopted after the date of this Agreement authorizing
     a governmental authority or authorities to impose a direct tax or
     taxes (whether a transaction tax, CO2 or other emissions tax or 
     energy tax) on electric generation fueled by coal, natural gas or
     other hydrocarbons, the rates under Section 4.4 shall be
     increased to reflect MDU's pro rata share of those costs.  MDU's
     share of these costs for each billing month shall be the product
     of (i) BHC's actual costs per megawatthour incurred by BHC as a
     result of such new taxes from all generated energy from BHC's
     electric generating plants (including BHC's interest in jointly
     owned plants) and energy purchased during that billing month,
     times (ii) the megawatthours of energy delivered by BHC to MDU
     during that month.

          4.6  Adjustment for Additional Capacity.  If the MDU
     Sheridan Service Territory requires capacity in excess of 55
     megawatts during the Service Term, the rates in Section 4.1, 4.2
     and 4.4 shall be increased to just and reasonable rates for that
     capacity and associated energy delivered by BHC in excess of 55
     megawatts to reflect BHC's costs to serve that additional
     capacity; provided, MDU at its option may purchase any capacity
     in excess of the 55 megawatts and associated energy and
     transmission service from others.  If BHC and MDU are unable to
     agree on the amount of BHC's costs in delivering capacity in
     excess of 55 megawatts and associated energy, the dispute shall
     be settled by arbitration under Section 6.

          4.7  Payment Schedule During Service Term.  Commencing
     on the fifth working day of February 1997 and continuing on the
     fifth working day of each month thereafter until and including
     the fifth working day of January, 2007, BHC shall send to MDU by
     telephone facsimile and by mailing, first class postage prepaid,
     an invoice for the capacity and energy delivered to MDU under
     this Agreement for the previous month.  Each invoice shall also
     set forth any payments due from BHC to MDU pursuant to Section  
     4.3 as credits to the amount owed by MDU.  MDU shall pay each
     invoice by the 10th working day of the month by wire transfer. 
     Simple interest shall accrue on any amount not paid when due at a
     rate of 125 percent of Chemical Bank's prime rate in effect
     during the period of delinquency.

     5.   GOVERNMENTAL REGULATION.

          5.1  Filing.  The parties shall submit this Agreement
     for filing to the FERC.  If the FERC issues an order not
     accepting this Agreement, including the CT Agreement, for filing
     in its entirety and without change, the parties shall:  (i)
     exercise best efforts to amend this Agreement to comply with such
     FERC order, or (ii) terminate this Agreement.

          5.2  Fixed Contract.  The terms, conditions, and
     formulae for prices for service specified in this Agreement and
     the CT Agreement shall remain in effect for the terms therein and
     shall not be subject to change through application to the FERC
     pursuant to the provisions of Section 205 of the Federal Power
     Act absent the agreement of the parties.  The parties covenant
     that neither shall request relief from any of the provisions of
     this Agreement pursuant to the provisions of Section 206 of the
     Federal Power Act absent the agreement of the parties.  The
     foregoing statutory references are intended to include any
     subsequent similar enactments.

     6.   ARBITRATION.

          If any dispute arises under this Agreement as to any factual
     matter, the parties shall submit the factual dispute to a board
     of three arbiters, one to be selected by each party and the
     parties to agree on the selection of a third arbiter.  If the
     parties are unable to agree on the third arbiter, the parties
     shall request the senior district judge of the United States
     District Court of the District of Wyoming to submit a list of
     five (5) persons.  Each party shall alternately strike one name
     from the list, the first exercise to be determined by lot.  The
     last person remaining on the list shall serve as the third 
     arbiter.  Except as otherwise set forth herein, the arbitration
     shall be held under the rules of the American Arbitration
     Association.  The arbiters shall render their decision in writing
     not later than thirty days after the matter has been submitted to
     them, and the decision of a majority of the board of arbiters of
     the factual dispute shall be binding on the parties.  Each party
     shall bear the expense of preparing and presenting its own case,
     and the expense of the arbitrators shall be equitably divided
     between the Owners by the arbitrators.

     7.   UNCONTROLLABLE FORCES.

          Neither party to this Agreement shall be considered to be in
     default in performance of any obligation hereunder if failure of
     performance shall be due to uncontrollable forces.  The term
     "uncontrollable forces" means any cause beyond the control of the
     party affected, including, but not limited to, failure of
     facilities, flood, earthquake, storm, fire, lightning, epidemic,
     war, riot, civil disturbance, labor disturbance, sabotage, and
     restraint by court order or public authority, which by exercise
     of due foresight such party could not reasonably have been
     expected to avoid, and which by exercise of due diligence it
     shall be unable to overcome.  A party shall not, however, be
     relieved of liability for failure of performance if such failure
     be due to causes arising out of its own negligence or to
     removable or remediable causes which it fails to remove or remedy
     with reasonable dispatch.  Any party rendered unable to fulfill
     any obligation by reason of uncontrollable forces shall exercise
     due diligence to remove such inability with all reasonable
     dispatch.  Nothing contained herein, however, shall be construed
     to require a party to prevent or settle a strike against its
     will.

     8.   NOTICES.

          Any notice, demand, or request provided for in this
     Agreement shall be deemed properly served, given, or made if
     delivered in person or sent by registered or certified mail,
     postage paid and return receipt requested, to the person so
     designated as its authorized representative.  The titles and
     addresses of the authorized representatives hereunder are as
     follows:

     For BHC:  President
               Black Hills Corporation
               625 Ninth Street
               P. O. Box 1400
               Rapid City, South Dakota  57709

     For MDU:  President
               Montana-Dakota Utilities Co.
               400 North Fourth Street
               Bismarck, ND  58501

     By giving written notice to the other party, a party may change
     the title and address for the purpose of receiving notice
     hereunder.

     9.   WAIVER.

          Any waiver by a party of its rights with respect to default
     under this Agreement, or with respect to any other matter arising
     in connection with this Agreement, shall not be deemed to be a
     waiver with respect to any subsequent default or matter.  No
     delay in asserting or enforcing any right hereunder shall be
     deemed a waiver of such right.

     10.  SEVERABLE OBLIGATIONS.

          Except where specifically stated in this Agreement to be
     otherwise, the duties, obligations, and liabilities of the
     parties are intended to be several and not joint or collective. 
     Nothing contained in this Agreement shall ever be construed to
     create an association, trust, partnership, or joint venture or to
     impose a trust or partnership duty, obligation, or liability on
     or with regard to either party.  Each party shall be individually
     and severally liable for its own obligations under this
     Agreement.

     11.  AMENDMENTS.

          No amendment of this Agreement shall be effective without
     written approval of each party.
  
     12.  ASSIGNMENT.

          This Agreement shall not be assigned to any third party
     without the written consent of the other, and such consent shall
     not be withheld unreasonably; provided, this Agreement shall
     inure to and be binding upon the successors in interest of
     substantially all of the electric properties of the respective
     parties and, if just MDU's electric system serving the MDU
     Sheridan Service Territory is sold or transferred to another
     entity, or condemned through the exercise of eminent domain, to
     the successor in interest to MDU's electric system serving the
     MDU Sheridan Service Territory.

     13.  CHOICE OF LAW.

          The parties in their performance of their obligations
     hereunder shall conform to all applicable laws, rules and
     regulations and, to the extent that their operations may be
     subject to the jurisdiction of state or federal regulatory
     agencies, subject to the terms of valid applicable orders of any
     of such agencies.  This Agreement shall be subject to and be
     construed under the laws of the State of Wyoming.

          IN WITNESS WHEREOF, the parties have executed this Agreement
     as of the date set forth in the first paragraph hereof.

                                BLACK HILLS CORPORATION


                                By /s/ Daniel P. Landguth
                                  Its Chief Executive Officer


                                MONTANA-DAKOTA UTILITIES CO., a
                                Division of MDU RESOURCES GROUP,
                                INC.


                                By /s/ Joseph R. Maichel
                                  Its President
<PAGE>
 Exhibit A

ANNUAL FIXED COSTS

Introduction

     This Appendix sets forth the elements and techniques to
calculate the annual fixed costs of the Combustion Turbine under
Section 4.3 for the Service Term and Section 5.2(b) of the CT
Agreement for the Remaining CT Term.

     The Annual Fixed Cost is the per-MW sum of:  (a) initial
levelized annual fixed cost, (b) subsequent levelized annual
fixed costs (if any), and (c) other fixed annual charges,
including but not limited to property taxes, insurance, and taxes
other than income tax.

Section A1:  Discussion of Methodology

     Levelized fixed charges are the basis of annual fixed costs
hereunder.  While actual capital-related charges associated with
an investment may vary considerably from year to year, the
levelized fixed charge translates these charges into a level
annual amount which remains constant over time.  The present
values of the two streams (varying versus constant) are equal.

     The levelized fixed charge includes three basic components: 
(a) return on investment, given a specific capital structure and
cost of capital; (b) recovery of investment, given the
appropriate depreciation period related to the investment; and
(c) income tax requirements, given tax law considerations.  These
components are commonly expressed as:  (a) interest expense on
debt and return required by shareholders; (b) book depreciation;
and (c) income taxes incorporating the effects of investment tax
credits and tax depreciation.

     An initial levelized annual charge rate will be applied to
the original investment of the Combustion Turbine.  The rate will
be recalculated effective each January 1 only in the event of a
change during the preceding calendar year in any of the
following:  (a) the common equity or (b) income tax law, but not
to be applied retroactively.

     Subsequent levelized annual fixed charge rates will be
calculated each year to reflect the most current information and
will be applied each year to the amount of capital additions,
replacements (less credit for net salvage and insurance proceeds,
if any) and betterments of the Combustion Turbine completed
through the end of the preceding calendar year.

Section A2:  Determination of Annual Fixed Costs

     Annual Fixed Costs will be determined by (a) adding the
amounts calculated under Sections A2.1 through A2.5 and (b)
dividing the total by the name plate rating of the Combustion
Turbine in MW.

     A2.1.  The initial levelized annual fixed charge rate
determined annually in accordance with Section A3 of this
Exhibit, multiplied by the party's original investment to
complete the Combustion Turbine.

     A2.2.  The sum for such year of each of the subsequent
levelized annual fixed charges determined for each year from the
Commercial Date to date.  Each subsequent annual levelized fixed
charge shall be determined by multiplying (a) the subsequent
levelized annual fixed charge rate, as calculated in accordance
with Section A3, below, by (b) the party's dollar investment in
capital additions, replacements (less credit for net salvage and
insurance proceeds, if any), and betterments of the Combustion
Turbine, completed during the calendar year immediately preceding
establishment of such subsequent levelized annual fixed charge.

     A2.3.  All ad valorem taxes imposed upon the Combustion
Turbine.

     A2.4.  Any tax, assessment, payment in lieu of taxes, or
other charge imposed by any governmental body assessed or charged
against the parties relating to the Combustion Turbine, excluding
ad valorem taxes and state and federal income taxes and taxes
covered under Section 4.5 of the Agreement.

     A2.5.  All insurance premiums incurred related to the
Combustion Turbine.

Section A3:  Elements of Levelized Annual Fixed Charge Rates

     A3.1   Capital Structure:  For purposes of calculating
initial levelized annual fixed charge rates and subsequent
levelized annual fixed charge rates, the capital structure will
remain constant for the duration of this Agreement.  The capital
structure is:

            Long-Term Debt             55%
            Preferred Stock             5%
            Common Stock Equity        40%

                 Total Capital        100%

     A3.2   Cost of Capital:

            A3.2.1.  Long-Term Debt:  Bond interest applicable in
     the calculation of each initial levelized annual fixed charge
     rate will be the Utility Long Bond Rate in effect within the 12-
     month period prior to the Commercial Date.  Bond interest
     applicable in the calculation of each subsequent levelized annual
     fixed charge rate for future capital additions, replacements, or
     betterments shall be the Utility Long Bond Rate, in effect during
     the twelve-month period prior to the date of the completion of
     construction of the capital additions, replacements or
     betterments for which the subsequent levelized annual fixed
     charge rate is calculated.  For the purposes herein, the Utility
     Long Bond Rate is the average interest charge on A-rated first
     mortgage bonds of a term of 20 to 25 years being issued by
     electric utilities during the period of time for which the
     calculation is being determined.

            A3.2.2.  Preferred Stock.  Return on preferred stock
     applicable in the calculation of each levelized annual fixed
     charge rate shall be 50 basis points above the Utility Long Bond
     Rate used to calculate that rate.

            A3.2.3.  Common Stock Equity.  Return on common stock
     equity applicable in the calculation of each initial levelized
     annual fixed charge rate and each subsequent levelized annual
     fixed charge rate shall be as agreed to by the parties from time
     to time.  In the event the parties are unable to agree to the
     return on common stock equity, either party may apply to the FERC
     for resolution of the dispute.

     A3.3   Book Depreciation:  Book depreciation charges shall
be at a straight-line rate based on a twenty-five (25) year life
in calculating the initial levelized annual fixed charge rates. 
Book depreciation charges for subsequent levelized annual fixed
charge rates shall be based on the estimated service life.

     A3.4.  Income Tax Requirements:  Income tax requirements
applicable in calculating both initial and subsequent levelized
annual fixed charge rates shall be based on the following items;
provided, subsequent changes in tax laws shall be incorporated in
computing levelized annual fixed charge rates for periods
following such tax law change:

            A3.4.1.  The federal corporate income tax rate
     (currently thirty-five percent (35%)).

            A3.4.2.  A state corporate income tax rate.  Any
     state corporate income tax rate shall be applied on a composite
     revenue weighted average in each state in which retail service is
     provided by the party for which the rate is being determined.

            A3.4.3.  Use of Modified Accelerated Cost Recovery
     System (MACRS) method of tax depreciation.

            A3.4.4.  Investment Tax Credits allowed, if any, in
     accordance with the provisions of the Internal Revenue Code, as
     amended, regardless of whether a party is able to use such
     credits.

            A3.4.5.  Income taxes shall be computed using the
     normalization method of accounting.

            A3.4.6.  The tax basis will be the actual percentage
     relationship between book basis and tax basis of the Combustion
     Turbine.

<PAGE>
 EXHIBIT B



                 CONSTRUCTION, OWNERSHIP AND OPERATION AGREEMENT


                                   between

 
                           Black Hills Corporation


                                     and


                        Montana-Dakota Utilities Co.,
                      a Division of MDU Resources, Inc.























Dated:  September 9, 1994

<PAGE>
TABLE OF CONTENTS


1.   RECITALS AND DEFINITIONS

     1.1  Definitions
     1.2  Recitals

2.   OWNERSHIP AND CONSTRUCTION OF COMBUSTION TURBINE

     2.1  Ownership
     2.2  Determination of Site and Construction Term
     2.3  Determination of Design and Engineering
     2.4  Construction Budget
     2.5  Payments for Construction
     2.6  Accounting
     2.7  Close of Account

3.   OPERATOR

     3.1  BHC Operator
     3.2  Operator's Obligations
     3.3  No Assignment of Operator's Duties
     3.4  Agency Authority
     3.5  Work Force
     3.6  Training Program
     3.7  Liens
     3.8  Remedy and Release

4.   USE OF COMBUSTION TURBINE

     4.1  During Service Term
     4.2  During Remaining CT Term
     4.3  After the CT Term
     4.4  Failure of MDU to Schedule
     4.5  Notification
     4.6  Black Hills' System Capacity in Lieu of MDU Schedule
     4.7  Capability Limits
     4.8  Operations

5.   PAYMENTS

     5.1  During the Service Term
     5.2  During the Remaining CT Term
     5.3  After the CT Term
     5.4  Oil and Spare Parts Inventory
     5.5  Payment Schedule

6.   OPERATION AND MAINTENANCE

     6.1  Operating Budget
     6.2  Additional Expenses0

7.   SCHEDULING OF OUTAGES

     7.1  Scheduled Outages
     7.2  Emergency Outages

8.   ACCOUNTING AND REPORTS

     8.1  Records
     8.2  FERC Accounting
     8.3  Audits and Contract Limitation to Make Claim
     8.4  Subchapter K IRC Exclusion

9.   INSURANCE

     9.1  Procurement
     9.2  Waiver of Subrogation

10.  CAPITAL ADDITIONS

     10.1 Determination of Capital Additions
     10.2 Construction of Elective Capital Addition
     10.3 Construction of Capital Addition
     10.4 Payment
     10.5 Budget for Additions

11.  LICENSES AND PERMITS

12.  LIABILITIES

     12.1 Mutual Release
     12.2 Construction Damage Losses

13.  DEFAULTS

     13.1 Written Demand
     13.2 Default
     13.3 Dispute Notification
     13.4 Arbitration of Disputes
     13.5 Remedy for Default
     13.6 Interest
     13.7 Additional Remedies
     13.8

14.  UNCONTROLLABLE FORCES

15.  WAIVER OF RIGHT TO PARTITION

16.  TRANSFER AND ASSIGNMENTS:  SECURED INTERESTS

17.  OBLIGATIONS ARE SEVERAL

18.  ARBITRATION

19.  APPLICABLE LAW AND REGULATIONS

20.  NOTICES

21.  ADDITIONAL DOCUMENTS

22.  END OF COMBUSTION TURBINE

23.  TERM

24.  OPTION AND RIGHT OF FIRST REFUSAL

     24.1 Right to Cause BHC to Purchase Combustion Turbine
     24.2 BHC's Right of First Refusal
     24.3 Sale Subject to Agreement

25.  MISCELLANEOUS

     25.1 Headings
     25.2 Singular/plural
     25.3 No Third-Party Beneficiaries
     25.4 Amended Only By Executed Writing

<PAGE>
EXHIBIT B


CONSTRUCTION, OWNERSHIP AND OPERATION AGREEMENT


     This Construction, Ownership and Operation Agreement, dated
as of September 9, 1994, is entered into between BLACK HILLS
CORPORATION, a South Dakota corporation, doing business as Black
Hills Power and Light Company, and Montana-Dakota Utilities Co.,
a Division of MDU RESOURCES GROUP, INC., a Delaware corporation.

     1.   RECITALS AND DEFINITIONS.

          1.1  Definitions.  The following capitalized words and
     phrases when used in this Agreement shall have the respective
     meanings as follows:

          "Additions and Replacements" are additions and
     replacements of portions or all of the Combustion Turbine as the
     Operator may determine during the Term in the application of
     Prudent Utility Practice to cause the Combustion Turbine to be
     operational and in compliance with law.  Additions and
     Replacements are those additions and replacements which would
     under generally accepted accounting principles be capitalized.

          "Agreement" is this Construction, Ownership and
     Operation Agreement.

          "BHC" is Black Hills Corporation, one of the parties to
     this Agreement.

          "Capital Additions" means additions, betterments and
     replacements to the Combustion Turbine necessary to assure design
     capability and reliability or that are required by law, or by
     order or regulation of a governmental agency having jurisdiction.

          "Capital Retirements" means those physical elements of
     the Combustion Turbine removed from service or used with the
     intent that the item so removed will not be placed back into
     service.

          "Combustion Turbine" is a combustion turbine to be
     fired either with fuel oil and/or natural gas of an approximate
     name plate size of 70 megawatts.

          "Commercial Date" is the date the Combustion Turbine is
     in commercial operation under Prudent Utility Practice.  The
     Commercial Date shall be the first day of a calendar month.

          "Construction" means all activities necessary for
     planning, engineering, acquisition and erection of the Combustion
     Turbine and of Capital Additions and Elective Capital Additions
     thereto.

          "Costs of Construction" are all costs allocable to
     Construction (excluding costs of fuel and allowance for funds
     used during construction), after giving appropriate consideration
     to credits relating to such costs and proceeds from dispositions
     of surplus property.  Without limiting the generality of the
     foregoing, such costs shall include:

          (a)  All costs of preliminary site investigation and
     development costs, land acquisition, architectural and
     engineering services, labor, materials, equipment, supplies,
     operator and other personnel training, testing, permits and
     licenses, legal services, Capital Additions and Elective Capital
     Additions;

          (b)  Payroll of Operator's employees, including fringe
     benefits, allocated on an actual time basis including related
     fringe benefits and payroll taxes;
 
          (c)  Traveling expenses including use of Operator's
     transportation equipment;

          (d)  All costs of insurance obtained pursuant to
     Section 9 hereof and applicable to Construction;

          (e)  All costs relating to injury and damage claims
     arising out of Construction less proceeds of insurance maintained
     in accordance with Section 9 hereof or insurance under any
     contract for Construction entered into pursuant to Section 2 or
     Section 10 hereof; and

          (f)  All federal, state and local taxes and payments in
     lieu of taxes legally required to be paid in connection with
     Construction, except any tax or payment in lieu of taxes assessed
     or charged directly against any individual Owner unless such tax
     or payment was assessed or charged to the individual Owner on
     behalf of the Combustion Turbine.

          "CT Term" is a period of time commencing with the
     Commercial Date and terminating ten years thereafter.

          "Elective Capital Additions" means additions,
     betterments and replacements to the Combustion Turbine that are
     not Capital Additions.

          "Fuel Costs" are the costs of fuel oil or natural gas
     acquired to fuel the Combustion Turbine.

          "MDU" is Montana-Dakota Utilities Co., a Division of
     MDU Resources Group, Inc., one of the parties to this Agreement.

          "Net Generating Capability" is the total amount of
     electrical energy which the Combustion Turbine is capable of
     generating, due allowance being made for legal, regulatory or
     physical constraints then obtaining, less the amount used in the
     production thereof, as determined at any time by the Operator.

          "Operating Expenses" are all expenses incurred in or
     relating to the operation and maintenance of the Combustion
     Turbine, including, but not limited to:

          (a)  Payroll of Operator's employees (including fringe
     benefits), allocated on an actual time basis including related
     fringe benefits and payroll taxes;

          (b)  Materials and supplies, including related
     purchasing and handling costs, spare parts inventory and costs of
     acquiring and maintaining fuel oil inventory;

          (c)  Traveling expenses, including use of Operator's
     transportation equipment;

          (d)  All costs relating to injury and damage claims
     arising out of operation and maintenance of the Combustion
     Turbine less proceeds of insurance maintained in accordance with
     Section 9 hereof.

          (e)  Auxiliary power costs;

          (f)  All federal, state or local taxes and payments in
     lieu of taxes (legally required to be paid in connection with the
     operation of the Combustion Turbine) except any tax, or payment
     in lieu of taxes, assessed or charged directly against an
     individual Owner unless such tax or payment was assessed or
     charged to the individual Owner on behalf of the Combustion
     Turbine; and

          (g)  Administrative and general expenses in an amount
     equal to a percentage of the total expenses detailed in
     paragraphs (a) through (g), but not including premium cost for
     insurance procured pursuant to Section 9.  The applicable
     percentage shall be established annually on the basis of the
     previous year's actual expenses.  The percentage shall be a
     ratio, the numerator of which is the Operator's administrative
     and general expenses and the denominator of which is the
     Operator's utility direct expenses to which such administrative
     and general expense applies.

          "Operator" is BHC or MDU if BHC sells its interest in
     the Combustion Turbine, and MDU exercises the option to become
     the Operator as provided at Section 3.3.

          "Owners" are BHC and MDU.

          "Owners Committee" is a committee composed of two
     persons, one to be designated to serve from time to time by each
     party to this Agreement.

          "Percentage Share" is each party's respective ownership
     interest in the Combustion Turbine as set forth at Section 2.1.

          "Power Agreement" is the Power Integration Agreement,
     dated as of the same date of this Agreement and entered into
     between BHC and MDU.

          "Prudent Utility Practice" at any particular time means
     either (a) any of the practices, methods and acts engaged in or
     approved by a significant portion of the electric utility
     industry prior thereto or (b) any of the practices, methods or
     acts, which, in the exercise of reasonable judgment in the light
     of the facts known at the time the decision was made, could have
     been expected to accomplish the desired result at the lowest
     reasonable cost consistent with reliability, safety and
     expedition.  Prudent Utility Practice is not intended to be
     limited to the optimum practice, method or act, to the exclusion
     of all others, but rather to be a spectrum of possible practices,
     methods or acts.  Prudent Utility Practice shall also include
     those practices, methods and acts that are required by applicable
     laws and final orders or regulations of regulatory agencies
     having jurisdiction.

          "Remaining CT Term" is that period of time commencing
     at the end of the Service Term and ending on the last day of the
     CT Term.

          "Term" commences with the Commercial Date and
     terminates at a date the Combustion Turbine as originally
     constructed, reconstructed, or added to is not, or cannot be
     made, capable of producing electricity consistent with Prudent
     Utility Practice or the requirements of governmental agencies
     having jurisdiction, plus any time required for ending the
     Combustion Turbine pursuant to Section 22; provided, the Term
     shall end earlier at the close of the sale transaction if BHC
     purchases MDU's interest in the Combustion Turbine under Section
     24 or by agreement of the parties.

          If the duration of any term or condition of this
     Agreement shall be subject to the rule against perpetuities or a
     similar or related rule, then the effectiveness of such term or
     condition shall not extend beyond (a) the maximum period of time
     permitted under such rule or (b) the specific applicable period
     of time expressed in this Agreement, whichever is shorter.  For
     purposes of applying the rule against perpetuities or a similar
     or related rule, the measuring lives in being shall be those of
     the officers and directors of BHC and MDU shown in their
     respective 1993 annual reports, together with all such listed
     persons' children and grandchildren living on the date of
     execution of this Agreement.  As used herein, the terms
     "children" and "grandchildren" shall have their primary generally
     accepted meaning of descendants, including persons who are
     legally adopted.

     Other capitalized terms and phrases used in this Agreement that
     are not otherwise defined herein but are defined in the Power
     Agreement shall have the same meaning as set forth in the Power
     Agreement.

          1.2  Recitals.  The Power Agreement provides for BHC
     supplying electric capacity and energy to MDU for its MDU
     Sheridan Service Territory, and under the terms thereof, the
     Combustion Turbine may be constructed at a time to be determined
     by BHC to provide for capacity to Black Hills' System and to
     allow MDU to provide a portion of the capacity for its MDU
     Sheridan Service Territory from an interest in the Combustion
     Turbine.  This Agreement sets forth the terms of the
     construction, ownership and operation of the Combustion Turbine.

     2.   OWNERSHIP AND CONSTRUCTION OF COMBUSTION TURBINE.

          2.1  Ownership.  Each party shall own as its Percentage
     Share an undivided 50 percent interest in the Combustion Turbine.

          2.2  Determination of Site and Construction Term.  BHC
     shall determine the site of the Combustion Turbine; provided, the
     site shall be within the service territory of BHC as it exists at
     this time, or within a 20-mile radius thereof, or the MDU
     Sheridan Service Territory.  In its sole discretion, BHC shall
     determine the time the Construction is to take place and the
     Commercial Date.

          2.3  Determination of Design and Engineering.  BHC
     shall determine the design and engineering of the Combustion
     Turbine; provided, that the design and engineering shall first be
     presented to the Owners Committee in time for a thorough review
     by both parties.  BHC shall take into consideration all comments
     of members of the Owners Committee before determining the final
     design and engineering of the Combustion Turbine and shall make
     its decision based on Prudent Utility Practices.

          2.4  Construction Budget.  As soon as BHC determines
     the timing of the Construction of the Combustion Turbine, BHC
     shall submit to the Owners Committee for its comments a budget
     setting forth an estimate of amounts expected to be expended for
     Costs of Construction and an estimated cash flow schedule for
     each calendar quarter during Construction.

          2.5  Payments for Construction.  The Operator shall
     periodically notify MDU a reasonable period of time in advance,
     as determined from time to time by the Operator, or in the event
     of an emergency as soon as practicable, of expenditures for Costs
     of Construction and the required payment schedule.  Whether or
     not such amounts are specified in a budget, each Owner shall pay
     its Percentage Share of such amounts as needed so that the
     Operator will have funds available to pay Construction Costs.

          2.6  Accounting.  On or before the 26th day of each
     month, the Operator shall render to MDU a statement showing for
     the preceding calendar month all Costs of Construction incurred
     by the Operator during such preceding month.  Any variance
     between such statement of actual Costs of Construction and the
     amounts deposited by the Owners in the previous month shall be
     added to or deducted from the respective Owner's obligations for
     such Costs of Construction in the month or months succeeding the
     issuance of such statement.

          2.7  Close of Account.  Within a reasonable time after
     the Commercial Date as is reasonably possible, the Operator shall
     make a final accounting of all Construction Costs for the initial
     Construction.

     3.   OPERATOR.

          3.1  BHC Operator.  BHC shall be the Operator of the
     Combustion Turbine on behalf of and for the account of Owners
     subject to the terms, conditions and covenants contained in this
     Agreement.  Except as otherwise herein provided, the Operator, as
     agent for and on behalf of Owners, shall construct, operate and
     maintain the Combustion Turbine, hire all Combustion Turbine
     personnel, and pay all Costs of Construction and Operating
     Expenses.

          3.2  Operator's Obligations.  BHC accepts the
     appointment as Operator and agrees that it will construct,
     operate and maintain the Combustion Turbine in accordance with
     Prudent Utility Practice, and any applicable laws, regulations, 
     orders, permits and licenses, now or hereafter in effect, of any
     governmental authority.

          3.3  No Assignment of Operator's Duties.  Unless MDU
     shall give its consent in writing, the Operator shall not assign
     its responsibility as Operator to any person except in connection
     with an assignment of its entire Percentage Share.  In the event
     BHC sells its interest in the Combustion Turbine to another
     entity, BHC shall give written notice to MDU of such sale, and
     MDU shall thereupon have the option to become the Operator of the
     Combustion Turbine and thereby enure to all rights and assume all
     obligations of the Operator under this Agreement.  MDU may
     exercise the option by giving BHC written notice thereof within
     60 days of the receipt of notice of the sale.

          3.4  Agency Authority.  Operator is hereby granted and
     shall have the power to exercise authority to do everything
     necessary, proper and usual, in the ordinary course of business,
     for effecting the purpose of its agency, including, but not
     limited to, the power to enter into contracts with third parties
     for and on behalf of the Owners, the power to make and receive
     payments, the power to initiate, compromise or settle claims with
     third parties, the power to act as agent in its own name, and the
     power to appoint subagents.  The grant of such agency powers to
     Operator shall remain in effect until the end of the Term.

          3.5  Work Force.  The Operator shall maintain a force
     of able and efficient manpower.  The work force will be employed
     in the classifications necessary to construct, operate and
     maintain the Combustion Turbine.  The Operator shall negotiate
     any contracts entered into with unions and set wage scales for
     nonunion personnel.

          3.6  Training Program.  Operator shall maintain a
     training program to assure the availability of qualified
     personnel for Construction, operation and maintenance of the
     Combustion Turbine.  If such training program utilizes facilities
     of the Operator other than Combustion Turbine, the costs of such
     training shall be allocated on an equitable basis to either Costs
     of Construction or Operating Expenses.
 
          3.7  Liens.  Operator shall pay promptly all sums due
     employees or due any governmental or other agency on their behalf
     or on account of their employment and shall not permit any
     material or labor claims to be filed against the property of the
     Owners, other than claims that are being contested in good faith.
 
          3.8  Remedy and Release.  Except for Operator's gross
     negligence, the sole remedy of MDU for failure by BHC to operate
     and maintain the Combustion Turbine in accordance with this
     Section 3 shall be to obtain specific performance of the
     obligations set forth herein.  MDU waives all rights for damages
     for any such failure, except for Operator's gross negligence, and
     releases BHC from all liability caused directly or indirectly
     from such failure.

     4.   USE OF COMBUSTION TURBINE.

          4.1  During Service Term.  During the Service Term as
     set forth in the Power Agreement, BHC is entitled to schedule for
     its purposes all capacity and energy from the Combustion Turbine,
     and MDU shall have no rights to such capacity and energy but
     shall be entitled to payments as provided at Section 4.3 of the
     Power Agreement.

          4.2  During Remaining CT Term.  MDU shall have an
     option, to be exercised before December 31, 2006 by written
     notice to BHC, to have the right to schedule for its purposes
     during the Remaining CT Term up to, but not to exceed, its
     Percentage Share of the Net Generating Capability; and BHC shall
     have the right to schedule for its purposes its Percentage Share.
 
     If MDU fails to exercise that option, BHC is entitled to schedule
     all capacity and energy from the Combustion Turbine during the
     Remaining CT Term, and MDU shall have no rights to such capacity
     and energy but shall be entitled to payments as provided at
     Section 5.2(b)(ii).

          4.3  After the CT Term.  After the CT Term and for the
     balance of the Term of this Agreement, each party shall have the
     right to schedule for its purposes up to, but not to exceed, its
     Percentage Share of the Net Generating Capability.

          4.4  Failure of MDU to Schedule.  During the Term, BHC
     shall have the right to schedule for its purposes any Net
     Generating Capability MDU could have scheduled, but did not,
     under Sections 4.2 and 4.3.

          4.5  Notification.  MDU shall provide BHC through its
     dispatchers its estimated hourly schedule of generation up to its
     authorized amount in a timely fashion as normally required by
     Prudent Utility Practice.

          4.6  Black Hills' System Capacity in Lieu of MDU
     Schedule.  At any time MDU schedules capacity and energy as
     authorized herein, BHC may as an alternative to operating the
     Combustion Turbine furnish MDU the scheduled capacity and energy
     from Black Hills' System delivered at the Combustion Turbine.  In
     that event, MDU shall pay BHC the Fuel Costs that would have been
     consumed to comply with MDU's schedule.

          4.7  Capability Limits.  The Operator shall determine
     the operating limits and operating capability of the Combustion
     Turbine and shall promptly notify MDU of any change therein.

          4.8  Operations.  The Operator shall, subject to
     unscheduled outages, operate the Combustion Turbine as scheduled
     by the Owners and shall hold deviations from schedule to a
     minimum.  Unless otherwise agreed among the Owners, actual
     generation shall be apportioned between the Owners in proportion
     to the generation schedules of the respective Owners.

     5.   PAYMENTS.

          5.1  During the Service Term.  During the Service Term,
     the obligations of each party are set forth in Section 4.3 of the
     Power Agreement.

          5.2  During the Remaining CT Term.  During the
     Remaining CT Term, the obligation of each party to pay costs are
     as follows:
               (a)    If MDU exercises its option granted at
         Section 4.2, each of the Owners shall pay its respective
         Percentage Share of the Operating Expenses, and  the Fuel Costs
         for the fuel consumed to generate the capacity and energy
         scheduled by it.

               (b)    If MDU does not exercise its option granted
         at Section 4.2, BHC shall pay (i) all Operating Expenses and Fuel
         Costs; and (ii) MDU Annual Fixed Costs per megawatt for MDU's
         interest in the Combustion Turbine.

          5.3  After the CT Term.  After the CT Term and during
     the balance of the Term of this Agreement, each of the Owners
     shall pay its respective Percentage Share of the Operating
     Expenses and shall pay the Fuel Costs for the fuel consumed to
     generate the capacity and energy scheduled by it.

          5.4    Oil and Spare Parts Inventory.  MDU shall
     pay Black Hills its Percentage Share of the fuel oil and spare
     parts inventory maintained for the Combustion Turbine at the
     following time:

               (a)    If MDU exercises its option granted at
          Section 4.2, the payment shall be made on the first day of the
          Remaining CT Term.

               (b)    If MDU does not exercise its option granted
          at Section 4.2, the payment shall be made on the last day of the
          Remaining CT Term.

          5.5  Payment Schedule.  During those months MDU is
     obligated to pay its Percentage Share of Operating Expenses and
     Fuel Costs and based upon invoices rendered by BHC, MDU shall pay
     the Operator by the 15th day of each month an amount equal to the
     estimated obligation for MDU that month for Operating Expenses
     and Fuel Costs.  

          On or before the fifth business day of each month, the
     Operator shall render to MDU an invoice showing for the preceding
     calendar month all Operating Expenses and Fuel Costs incurred by
     the Operator during such preceding month and the amounts thereof
     MDU is obligated to pay.  Any variance between such statement and
     the estimated amounts previously paid by MDU for that month shall
     be added to or deducted from MDU's obligation for succeeding
     months.  MDU shall pay the invoice by the 15th day of the month
     the invoice is rendered.  Interest at Chemical Bank's prime rate
     shall be added to underpayments and deducted from overpayments of
     estimated amounts.  During those months BHC is obligated to pay
     MDU Annual Fixed Costs, BHC shall pay MDU one-twelfth of the
     Annual Fixed Cost each month by the 15th day of the month for
     which the payment is being made.
 
     6.   OPERATION AND MAINTENANCE.

          6.1  Operating Budget.  On or before October 1 of each
     year, the Operator shall submit to the Owners Committee for its
     comments a budget of its estimate of Operating Expenses by
     calendar months for the operating year beginning January 1 next
     following.  Such comments shall be provided no later than
     December 1 in any such year.  After taking into account all
     comments of both members of the Owners Committee, the final
     budget shall be determined by BHC.  Each budget shall include
     such items of expenditures for replacement and repair of the
     Combustion Turbine as are normal to projects of a similar
     character and shall provide an adequate contingency item for
     emergency repairs and replacements.  BHC will submit to the
     Owners Committee any budget revision which changes the budget by
     10% or more during any calendar year which MDU shall promptly
     consider.  After taking into account all comments of both members
     of the Owners Committee, the final budget revision shall be
     determined by BHC.

     The Owners recognize that it will be necessary for continued
     operation of the Combustion Turbine, or to maintain the
     Combustion Turbine in operable condition, that the Operator be in
     a position to meet commitments for payroll, repairs and
     replacements, materials and supplies, services and other expenses
     of a continuing nature in order that it may fulfill its
     obligations as Operator under this Agreement.  Accordingly,
     notwithstanding any of the provisions of this Section, the
     Operator, on behalf of the Owners, may make all expenditures in
     the normal course of business or in an emergency, as necessary
     for the proper and safe operation and maintenance of the
     Combustion Turbine and the Owners will advance or reimburse their
     respective Percentage Share of such expenditures when provided in
     this Agreement.

           6.2  Additional Expenses.  To the extent not set forth
     in the annual budget, the Operator will provide, not later than
     the first of each month, a schedule of payments to be made of
     Operating Expenses in such month.  The Operator may, during the
     month, notify MDU of additional dates or additional amounts, if
     unanticipated obligations are incurred.

     7.   SCHEDULING OF OUTAGES.

          7.1  Scheduled Outages.  Scheduled outages for
     maintenance shall be as required by the manufacturers' applicable
     conditions of sale and delivery of the affected facilities and
     equipment.  Maintenance shall be in such month and year and for
     such periods of time as shall be determined by (i) the Operator
     during the period of time that MDU has no right to schedule
     capacity and energy from the Combustion Turbine, and (ii) by the
     agreement of both members of the Owners Committee during that
     period of time that MDU has the right to schedule capacity and
     energy from the Combustion Turbine.  The Operator shall submit
     all proposed scheduled maintenance outage periods to the Owners
     Committee at least once a year with a sufficient lead time to
     allow both members of the Owners Committee to respond to BHC
     before the final maintenance schedule is determined.

          7.2  Emergency Outages.  In the event of emergency
     outages, or forced outages, or reductions in Combustion Turbine
     for any reason, the Operator shall determine a normal schedule
     for repair or replacement or other restoration.

     8.   ACCOUNTING AND REPORTS.

          8.1  Records.  The Operator shall keep adequate records
     of Project Construction and operations, including records
     necessary to reflect the efficiency of Project operations and
     maintenance programs, and to record generation of power, and
     shall keep other records as required by regulatory authorities. 
     All records shall be made available for inspection by the Owners
     as desired and copies shall be furnished the Owners upon request.

          8.2  FERC Accounting.  All accounts shall be kept so as
     to permit conversion to the system of accounts prescribed for
     electric utilities by the FERC, or any successor commission, but
     the manner in which accounts are kept pursuant to this Agreement
     is not intended to be determinative of the manner in which they
     are treated in the books of account of the Owners.

          8.3  Audits and Contract Limitation to Make Claim.  MDU
     may request the Operator from time to time, but no more than once
     a year, to cause all books and records to be audited by MDU's
     internal auditing staff or by independent Certified Public
     Accountants of national reputation selected by Operator with the
     approval of MDU, which approval shall not be unreasonably
     withheld.  Copies of such audits shall be supplied to each Owner.

     The cost of such independent auditors shall be shared equally by
     the parties.

          Each party waives any claim against the other party for any
     incorrect payments under this Agreement if notice of such claim
     is not given the other party within two years after the incorrect
     payments were made.

          8.4  Subchapter K IRC Exclusion.  Operator shall
     prepare and the Owners shall make the appropriate election under
     regulations promulgated under Section 761 of the Internal Revenue
     Code to have the organization which the Owners may be deemed to
     comprise excluded from the provisions of Subchapter K of the
     Code.

     9.   INSURANCE.

          9.1  Procurement.  The Operator shall procure at the
     earliest practicable time and thereafter maintain in effect at
     all times hereinafter provided, to the extent available at
     reasonable cost and in accordance with standards prevailing in
     the utility industry for projects of similar size and nature,
     adequate insurance coverage of the Combustion Turbine with
     responsible insurers, with each Owner as a named assured as its
     respective interests may appear, to protect and insure against: 
     employer's liability, public liability for bodily injury and
     property damage, all risks of physical damage to property or
     equipment, including transportation and installation perils, and
     such other insurance as the Owners deem necessary, with
     reasonable limits and subject to appropriate exclusions, and
     deductibles.

          9.2  Waiver of Subrogation.  Each Owner shall ensure
     that each of its policies of insurance that may be applicable to
     any claims arising in connection with the Project shall include
     broad-form contractual coverage or contain a waiver of the
     insurer's rights of subrogation against, or name as additional
     assureds, the other Owner and its respective agents and
     employees.  To the extent permitted by its insurance policies,
     each Owner waives any rights of subrogation against the other
     Owner, its agents and employees, for losses, costs, damages, or
     expenses arising out of the Construction, operation, maintenance,
     reconstruction or repair of the Project.

     10.  CAPITAL ADDITIONS.

          10.1 Determination of Capital Additions.  After timely
     notifying the Owners Committee and taking into account all
     comments from both members of the Owners Committee, BHC shall
     determine the necessity of a Capital Addition or an Elective
     Capital Addition.  The Operator shall prepare and deliver to the
     Owners Committee a cost estimate of such Capital Addition, or
     Elective Capital Addition.

          10.2 Construction of Elective Capital Addition.  If the
     Owners agree, the Operator shall proceed with construction of an
     Elective Capital Addition, with the costs thereof to be borne by
     the Owners in proportion to their Percentage Shares.  Without
     Agreement the Operator shall proceed with an Elective Capital
     Addition at the request of an Owner at such Owner's sole cost;
     provided that such Elective Capital Addition does not diminish
     the entitlement or increase the costs of the other Owner.
 
          10.3 Construction of Capital Addition.  The Operator
     shall proceed with construction of a Capital Addition with the
     costs thereof to be borne by the Owners in proportion to their
     Percentage Shares.

          10.4 Payment.  The Operator shall notify MDU not less
     than 20 days in advance of a required Capital Addition payment,
     and MDU shall make payments to the Operator at the time when the
     Operator needs such funds to pay the costs of Construction of the
     Capital Addition.

          10.5 Budget for Additions.  On or before October 1 of
     each year, Operator shall submit to the Owners Committee a budget
     of its estimate of expenditures required to be made for Capital
     Additions or Elective Capital Additions pursuant to this section,
     for the calendar year beginning January 1 next following. 
     Issuance and receipt of such budget shall not obligate either
     Owner to proceed with construction of such additions or bear the
     costs thereof, other than pursuant to the provisions of this
     Section 10.

     11.  LICENSES AND PERMITS.

          Upon the expiration of any licenses or permits required for
     the operation of the Combustion Turbine, or should any additional
     or further licenses or permits be required, the Owners agree to
     file timely applications for a new or further license or permit,
     as the case may be, to be held as tenants in common in the
     undivided interests set forth hereinabove.

     12.  LIABILITIES.

          12.1 Mutual Release.  Each of the Owners releases the
     other and its agents and employees from liability for any claims
     for loss or damage, including claims for consequential loss or
     damage, arising out of the ownership, Construction, operation,
     maintenance or repair of the Combustion Turbine, due to
     negligence, excluding gross negligence, including but not limited
     to loss of use and loss of profit.

          12.2 Construction Damage Losses.  Any loss, cost,
     liability, damage and expense to the Owners or either of them,
     arising out of the Construction of the Combustion Turbine and
     based upon injury to or death of persons or damage to or loss of
     property including the Combustion Turbine or other property of
     Owners and other persons, to the extent not covered by
     collectible insurance, shall be charged to Costs of Construction.

     13.  DEFAULTS.

          13.1 Written Demand.  Upon failure of an Owner to make
     or cause to be made any payment when due, or to perform or cause
     to be made or performed any other obligation to be made or
     performed, the other Owner may make written demand upon said
     Owner for such payment or performance.

          13.2 Default.  If the failure of an Owner is to make a
     payment when due and such failure is not cured within five (5)
     days from the date of a demand made pursuant to Section 13.1, it
     shall constitute a default at the expiration of such period.

          13.3 Dispute Notification.  If an Owner shall dispute a
     default asserted against it, then such Owner shall timely make or
     cause to be made payment of any sums in dispute or perform the
     obligation in dispute but may do so under protest.  Such protest
     shall be in writing, shall specify the reasons upon which the
     protest is based and a copy thereof shall be mailed to the other
     Owner.  Upon resolution of such dispute, the payments advanced or
     made between Owners, as in this paragraph provided, shall be
     adjusted appropriately.

          13.4 Arbitration of Disputes.  All disputes referred to
     in Section 13.3 above shall be submitted to arbitration pursuant
     to Section 18 to determine the extent, if any, of the obligation
     of the Owner disputing such default.  If payment or performance
     is timely made under protest, an act of default shall not be
     deemed to have occurred.

          13.5 Remedy for Default.  In the event that an Owner is
     in default because of failure to make payments when due, then the
     following shall occur during the period such Owner is in default
     unless the nondefaulting Owner elects otherwise in writing:

          The defaulting Owner's Percentage Share of the output
     of the Project shall be deemed to be assigned to the Operator on
     behalf of the nondefaulting Owner during the period of default
     and may be sold by the Operator and the proceeds applied to the
     amounts owed by the defaulting Owner pursuant to the Project
     Agreements.

     In the event of a default, the nondefaulting Owner is authorized
     to execute, deliver and file such notices, demands, agreements,
     consents, financing statements, applications and other documents
     as are necessary or appropriate to implement the provisions of
     this subsection to the full extent legally possible.  In the
     event that any of the provisions of this subsection are waived by
     the nondefaulting Owner or are held to be unenforceable by
     competent authority, then the remaining provisions shall be
     severable and in full force and effect.
 
          13.6 Interest.  Payments not made when due by an Owner
     may be advanced by the other Owner and, if so advanced, shall
     bear simple interest at the rate of 125% of Chemical Bank's prime
     rate in effect during the period of delinquency.
  
          13.7 Additional Remedies.  In addition to the rights
     granted in this Section 13, any nondefaulting Owner may take any
     action, at law or in equity, including an action for specific
     performance, to enforce this Agreement and to recover for any
     loss, damage or payment advances, including attorneys' fees in
     all trial and appellate courts and collection costs incurred by
     reason of such default.

          13.8 Section 13.5 shall not create an encumbrance prior
     to the lien of any existing mortgage, loan or credit agreement of
     either Owner except to the extent permitted thereunder.

     14.  UNCONTROLLABLE FORCES.

          No Owner shall be considered to be in default in the
     performance of any of its obligations hereunder, other than
     obligations of such Owner to pay costs and expenses, if failure
     of performance shall be due to uncontrollable forces.  The term
     "uncontrollable forces" shall mean any cause beyond the control
     of the Owner failing to perform, and which, by the exercise of
     reasonable diligence, such Owner is unable to overcome, and shall
     include but not be limited to an act of God, fire, flood,
     explosion, strikes, labor disputes, labor or materials shortages,
     sabotage, an act of the public enemy, civil or military
     authority, including court orders, injunctions, and orders of
     government agencies with proper jurisdiction prohibiting acts
     necessary to performance hereunder or permitting any such act
     only subject to unreasonable conditions, insurrection or riot, an
     act of the elements, failure of equipment, inability to obtain or
     ship materials or equipment because of the effect of similar
     causes on suppliers or carriers or failure of any governmental
     agency to timely act.  Nothing contained herein shall be
     construed so as to require an Owner to settle any strike or labor
     dispute in which it may be involved.  Any Owner rendered unable
     to fulfill any obligation by reason of uncontrollable forces
     shall exercise due diligence to remove such inability with all
     reasonable dispatch.

     15.  WAIVER OF RIGHT TO PARTITION.

          So long as the Combustion Turbine or any part thereof as
     originally constructed, reconstructed or added to is used or
     useful for the generation of electric power and energy, or to the
     end of the period permitted by applicable law, whichever first
     occurs, the Owners waive their right to partition whether by
     partition in kind or sale and division of the proceeds thereof,
     and agree that they will not resort to any action at law or in
     equity to partition and further waive the benefit of all laws
     that may now or hereafter authorize such partition of the
     properties comprising the Combustion Turbine.  It is agreed that
     this covenant shall be deemed to run with the land.

     16.  TRANSFER AND ASSIGNMENTS:  SECURED INTERESTS.

          All or any part of the interest of each Owner in the
     Combustion Turbine or any part thereof may be transferred and
     assigned as follows, but not otherwise:

          (a)  To any mortgagee, trustee, or other secured party,
     as security for bonds or other indebtedness of such Owner,
     present or future, and such secured party may transfer or assign
     the interest given as security pursuant to or in lieu of, a
     foreclosure of the lien (or the exercise of power of sale) held
     by such secured party, provided that the transferee or assignee
     assumes all the duties and obligations of the Owner making the
     transfer or assignment.

          (b)  To any person in the electric utility business
     into which or with which the Owner making the transfer may be
     merged or consolidated or to which the Owner transfers
     substantially all of its assets.

          (c)  To any person the stock or ownership of which is
     wholly owned by the Owner making the transfer.
  
          (d)  To any other person with a written consent of the
     other Owner.

          (e)  By MDU to any person after complying with the
     conditions of Section 24.

     17.  OBLIGATIONS ARE SEVERAL.

          The duties, obligations and liabilities of the Owners
     hereunder are intended to be several and not joint or collective
     and no Owner shall be jointly or severally liable for the acts,
     omissions, or obligations of the other Owner.  Nothing herein
     contained shall be construed to create an association, joint
     venture, partnership, or impose a partnership duty, obligation or
     liability, between the Owners.  No Owner shall have a right or
     power to bind the other Owner without its express written
     consent, except as expressly provided in this Agreement.

     18.  ARBITRATION.

          If any dispute arises under this Agreement as to any factual
     matter, the parties shall submit the factual dispute to a board
     of three arbiters, one to be selected by each party and the
     parties to agree on the selection of a third arbiter.  If the
     parties are unable to agree on the third arbiter, the parties
     shall request the senior district judge of the United States
     District Court of the District of Wyoming to submit a list of
     five (5) persons.  Each party shall alternately strike one name
     from the list, the first exercise to be determined by lot.  The
     last person remaining on the list shall serve as the third 
     arbiter.  Except as otherwise set forth herein, the arbitration
     shall be held under the rules of the American Arbitration
     Association.  The arbiters shall render their decision in writing
     not later than thirty days after the matter has been submitted to
     them, and the decision of a majority of the board of arbiters of
     the factual dispute shall be binding on the parties.  Each party
     shall bear the expense of preparing and presenting its own case,
     and the expense of the arbitrators shall be equitably divided
     between the Owners by the arbitrators.

     19.  APPLICABLE LAW AND REGULATIONS.

          The Owners in their performance of their obligations
     hereunder shall conform to all applicable laws, rules and
     regulations and, to the extent that their operations may be
     subject to the jurisdiction of state or federal regulatory
     agencies, subject to the terms of valid and applicable orders of
     any such agencies.  This Agreement shall be subject to the laws
     of the State of South Dakota.

     20.  NOTICES.

          Any notice, demand, or request provided for in this
     Agreement shall be deemed properly served, given, or made if
     delivered in  person or sent by registered or certified mail,
     postage paid and return receipt requested, to the person so
     designated as its authorized representative.  The titles and
     addresses of the authorized representatives hereunder are as
     follows:

     For BHC:  President
               Black Hills Corporation
               625 Ninth Street
               P. O. Box 1400
               Rapid City, South Dakota  57709

     For MDU:  President
               Montana-Dakota Utilities Co.
               400 North Fourth Street
               Bismarck, North Dakota  58501

     By giving written notice to the other party, a party may change
     the title and address for the purpose of receiving notice
     hereunder.

     21.  ADDITIONAL DOCUMENTS.

          Each Owner, upon request by the other Owner, shall make,
     execute and deliver any and all documents reasonably required to
     implement the terms of this Agreement.

     22.  END OF COMBUSTION TURBINE.

          When in the agreement of both members of the Owners
     Committee the Combustion Turbine can no longer be made capable of
     producing electricity consistent with Prudent Utility Practice or
     the requirements of governmental agencies having jurisdiction, or
     when part or all of the Combustion Turbine is removed from
     service, Operator shall sell all salable parts of the portion of
     the Combustion Turbine being removed from service to the highest
     bidders; provided, however, if the entire Combustion Turbine is
     being removed from service and if Operator should determine that
     the Combustion Turbine will bring a greater amount at salvage if
     sold as a unit than it would if it were dismantled and the
     salable parts removed and sold, then Operator may sell the
     Combustion Turbine as a unit to the highest bidder.  After
     deducting all costs of ending the Combustion Turbine, including,
     without limiting the generality of the foregoing, the cost of
     decommissioning, razing all structures and disposing of the
     debris and meeting all applicable requirements of law, Operator
     shall close any remaining Combustion Turbine accounts and, if
     there are net proceeds, distribute to each Owner its Percentage
     Share of such proceeds.  In the event such costs of ending the
     Combustion Turbine exceed available funds, each Owner shall pay
     its Percentage Share of such excess as incurred.

     23.  TERM.

          This Agreement shall continue for the Term.

     24.  OPTION AND RIGHT OF FIRST REFUSAL.

          24.1 Right to Cause BHC to Purchase Combustion Turbine.
     MDU shall have an option to cause BHC to purchase MDU's interests
     in the Combustion Turbine as of the last date of the CT Term. 
     The purchase price to be paid by BHC to MDU shall be the original
     cost depreciated of MDU's interests therein (including any fuel
     oil and spare parts inventory owned by MDU) as determined by
     generally accepted accounting principles.  MDU may exercise its
     option by giving BHC written notice thereof on or before the last
     day of the Service Term.  Upon the payment of the purchase price,
     MDU shall transfer to BHC title to its interests in the
     Combustion Turbine free of any liens or encumbrances caused or
     created by MDU through its mortgage indentures or otherwise.

          24.2 BHC's Right of First Refusal.  If MDU does not
     exercise its option to cause BHC to purchase its interest in the
     Combustion Turbine as of the end of the CT Term as provided in
     Section 24.1, MDU may sell its interest therein at any time after
     the CT Term; provided, before MDU may sell its interest to an
     entity other than BHC, MDU must first offer BHC in writing a
     right of first refusal.  Within 90 days following the receipt of
     the right of first refusal, BHC shall have an option to acquire
     MDU's interest in the Combustion Turbine at a purchase price
     equal to MDU's original cost depreciated as determined by
     generally accepted accounting principles.  BHC's option shall be
     exercised by written notice to MDU.  If BHC fails to exercise its
     option, MDU may sell its interest in the Combustion Turbine to
     any other entity.

          24.3 Sale Subject to Agreement.  The purchaser of MDU's
     interest in the Combustion Turbine shall be bound by the terms
     and provisions of this Agreement, and BHC shall retain all of its
     rights to the operation, control and capacity and energy output
     of the Combustion Turbine as set forth in this Agreement.

     25.  MISCELLANEOUS.

          25.1 Headings.  The headings of the Sections of this
     Agreement are inserted for convenience of reference only and
     shall not affect the meaning or construction thereof.

          25.2 Singular/plural.  The singular of any term in this
     Agreement shall encompass the plural and the plural the singular,
     unless the context otherwise indicates.

          25.3 No Third-Party Beneficiaries.  This Agreement is
     made solely for the benefit of the Owners, and is not, and shall
     not be construed to be, made for the benefit of any person not a
     party hereto.

          25.4 Amended Only By Executed Writing.  This Agreement
     shall not be amended except by written instrument executed,
     acknowledged and delivered by each of the Owners.

          IN WITNESS WHEREOF, the Owners have executed this Agreement
     in duplicate.
                                BLACK HILLS CORPORATION



                                By /s/ Daniel P. Landguth
                                  Its Chief Executive Officer


                                MONTANA-DAKOTA UTILITIES CO., a
                                Division of MDU RESOURCES GROUP,
                                INC.



                                By /s/ Joseph R. Maichel
                                  Its President


                                                                 Exhibit 99

Release Date:                                Daniel Landguth
                                             Chairman, President and CEO
September 9, 1994                            
                                             Barbara Thirstrup
                                             Manager of Governmental
                                             and Public Affairs

Rapid City, S.D.--Black Hills Corporation, operating its electric utility
as Black Hills Power and Light Company, announced today that it has entered
into a ten-year contract with Montana-Dakota Utilities Co.  Beginning
January 1, 1997, BHC will supply electric power and energy for all of MDU's
electric service requirements for its Sheridan, Wyoming service territory. 
The contract is subject to the approval of the Federal Energy Regulatory
Commission.

      In announcing the new contract, Dan Landguth, BHC's CEO, stated:
      
           Customers of both MDU and BHC will benefit from this
           contract.  Because MDU awarded the contract through
           extensive open competitive proposals, MDU is purchasing
           the power for its Sheridan area customers at the lowest
           available market-based rates. 

           BHC benefits as well, as the sale will increase the
           company's revenues an estimated $90 million over the
           ten-year contract period.  This is significant for both
           customers and shareholders of BHC.  Because of the
           sale, a lower rate increase than had previously been
           estimated will be required in late 1995 when BHC
           completes the Neil Simpson Unit No. 2, an 80 megawatt
           coal-fired electric generating plant now under
           construction near Gillette, Wyoming.

           For BHC shareholders, the sale will allow the company
           to operate more efficiently and will position the
           company to be more competitive in an emerging open
           wholesale power market.

           BHC and MDU further mutually benefit because of their
           agreement to share equal ownership in a new combustion
           turbine. The turbine will be constructed at such time
           that BHP's system will require a new peaking resource. 
           By building the turbine together, both companies
           receive the benefits of lower unit costs from a turbine
           that will be larger than either company could justify
           on its own.


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