MDU RESOURCES GROUP INC
424B5, 1997-09-15
GAS & OTHER SERVICES COMBINED
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                                            Filed Pursuant to Rule 424(b)(5)   
                                            Registration No. 33-46605



             PROSPECTUS SUPPLEMENT TO PROSPECTUS DATED SEPTEMBER 15, 1997
                                     $45,000,000
                               MDU RESOURCES GROUP, INC.
                         SECURED MEDIUM-TERM NOTES, SERIES A
                          (A SERIES OF FIRST MORTGAGE BONDS)
                    DUE NOT LESS THAN 9 MONTHS FROM DATE OF ISSUE


               MDU  Resources Group,  Inc. (the  "Company") may  offer from
          time  to  time  its  Secured  Medium-Term  Notes,  Series  A (the
          "Notes"), due not  less than 9 months from the  date of issue, in
          an aggregate principal amount not to exceed $45,000,000.

               Each Note will bear  interest at the fixed or  variable rate
          or  rates  per  annum  set  forth  in  the applicable  supplement
          ("Pricing Supplement") accompanying  this Prospectus  Supplement,
          and interest  will  be  payable semiannually  each  April  1  and
          October 1 and at maturity. See "Description of Notes."

               The  issue  price and  Maturity Date  of  each Note  will be
          established by the Company at the  time of issuance of such  Note
          and will be set forth in  the applicable Pricing Supplement.  The
          Notes  will not be subject  to any sinking  fund unless otherwise
          specified  in the  applicable Pricing  Supplement and,  unless an
          Initial Redemption  Date is  specified in the  applicable Pricing
          Supplement, the  Notes  will not  be  redeemable prior  to  their
          Maturity  Date.  If an  Initial Redemption Date  is so specified,
          the Notes will be redeemable at  the option of the Company at any
          time after such date  as described therein.  See  "Description of
          Notes."

               The Notes will be initially registered in the name of Cede &
          Co.  as registered  owner and  nominee for  The Depository  Trust
          Company ("DTC").  DTC will act as a securities depository for the
          Notes  of  each  issue.    Unless  otherwise  specified   in  the
          applicable Pricing Supplement,  sales of Notes will be  made only
          in book-entry form in  denominations of $10,000 or any  amount in
          excess  thereof that  is  an integral  multiple  of $10,000  and,
          except   under  the   limited  circumstances   described  herein,
          beneficial owners  of interests  in  the Notes  will not  receive
          certificates representing their interests in the Notes.  Payments
          of  principal, premium, if any, and interest will be made through
          DTC and its  Participants and disbursements  of such payments  to
          purchasers will be the responsibility of such Participants.   See
          "Description of Notes -Book-Entry System."

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


          THESE  SECURITIES HAVE NOT  BEEN APPROVED  OR DISAPPROVED  BY THE
          SECURITIES  AND  EXCHANGE  COMMISSION  OR  ANY  STATE  SECURITIES
          COMMISSION NOR  HAS THE SECURITIES AND EXCHANGE COMMISSION OR ANY
          STATE SECURITIES COMMISSION PASSED  UPON THE ACCURACY OR ADEQUACY
          OF THIS PROSPECTUS SUPPLEMENT,  ANY PRICING SUPPLEMENT THERETO OR
          THE ACCOMPANYING PROSPECTUS.   ANY REPRESENTATION TO THE CONTRARY
          IS A CRIMINAL OFFENSE.

                             --------------------
                                                                       
     <PAGE>
                                          AGENTS'
                                         DISCOUNTS
                          PRICE TO    AND COMMISSIONS    PROCEEDS TO THE
                         PUBLIC (1)         (2)          COMPANY (2)(3)
                          --------    ---------------    ---------------
          Per Note  .       100%        .125%-.875%      99.875%-99.125%
                                          $56,250-         $44,943,750-
          Total . . .   $45,000,000       $393,750         $44,606,250

          -----------
          (1)  The Notes will be  issued at 100% of their  principal amount
               unless   otherwise  specified  in   the  applicable  Pricing
               Supplement.
          (2)  The  Company  will  pay  to  Goldman,  Sachs  & Co.,  Lehman
               Brothers, Lehman  Brothers Inc.,  and  Salomon Brothers  Inc
               (the  "Agents"),  a  commission  of  from  .125%  to  .875%,
               depending on the  Maturity Date, of the  principal amount of
               any  Notes  sold through  them as  Agents  (or sold  to such
               Agents  as  principal in  circumstances  in  which no  other
               discount is agreed). The Company has agreed to indemnify the
               Agents  against  certain liabilities,  including liabilities
               under the Securities Act of 1933.
          (3)  Before deducting estimated  expenses of $337,500 payable  by
               the  Company,  including  expenses  of  the  Agents  to   be
               reimbursed by the Company.

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

               Offers  to   purchase  Notes  are  being   solicited,  on  a
          reasonable best efforts basis, from time to time by the Agents on
          behalf  of the Company. Notes may be  sold to the Agents on their
          own behalf  at negotiated discounts  for resale  to investors  or
          other  purchasers. The Company  reserves the right  to sell Notes
          directly on its own  behalf. The Company also reserves  the right
          to withdraw, cancel  or modify the  offering contemplated  hereby
          without notice. No termination date for the offering of the Notes
          has  been established. The Company  or the Agents  may reject any
          offer to purchase Notes,  in whole or in part.  See "Supplemental
          Plan of Distribution."

          GOLDMAN, SACHS & CO.
                                   LEHMAN BROTHERS
                                                       SALOMON BROTHERS INC

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

            The date of this Prospectus Supplement is September 15, 1997.

     <PAGE>

               CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN
          TRANSACTIONS THAT  STABILIZE, MAINTAIN  OR  OTHERWISE AFFECT  THE
          PRICE  OF  THE NOTES,  INCLUDING OVER-ALLOTMENT,  STABILIZING AND
          SHORT-COVERING TRANSACTIONS IN SUCH NOTES, AND THE IMPOSITION  OF
          A   PENALTY  BID,  IN  CONNECTION  WITH  THE  OFFERING.    FOR  A
          DESCRIPTION  OF  THESE  ACTIVITIES,  SEE  "SUPPLEMENTAL  PLAN  OF
          DISTRIBUTION."


                                 DESCRIPTION OF NOTES


               The information herein concerning the Notes supplements and,
          to  the extent  inconsistent  therewith, replaces  the statements
          under "Description  of Notes" in the  accompanying Prospectus, to
          which  statements reference is hereby  made. The Notes  will be a
          series  of First Mortgage Bonds as defined in the Prospectus. The
          following description  will apply  to the Notes  unless otherwise
          specified in the applicable Pricing Supplement.

          GENERAL

               The Notes  are to be  issued as a  series of First  Mortgage
          Bonds under and  secured by an Indenture of Mortgage, dated as of
          May 1, 1939, from the Company  to The New York Trust Company (The
          Bank of New  York, successor Corporate Trustee)  and A.C. Downing
          (W.T. Cunningham, successor Individual Trustee), as Trustees, and
          indentures  supplemental  thereto,   including  the   Forty-fifth
          Supplemental  Indenture,   which   contains  a   Restatement   of
          Indenture,  relating to the Notes,  all of which are collectively
          referred to as  the "Indenture."  The Notes will  be equally  and
          ratably  secured with all other First Mortgage Bonds issued or to
          be issued under the Indenture. For further information concerning
          the security for  the Notes,  see "Description of  Notes" in  the
          accompanying Prospectus.  The Notes  are limited to  an aggregate
          principal amount of $45,000,000. 

               The Notes will  be offered  on a continuing  basis.   Unless
          previously redeemed, a  Note will mature  on the date  ("Maturity
          Date") not less than 9 months from the date of issue specified on
          the face thereof and in the applicable  Pricing Supplement. Prior
          to maturity, the Notes  may be subject to optional  redemption by
          the Company if so  provided in the applicable Pricing  Supplement
          at the price  or prices set  forth therein. Each  Note will  bear
          interest  at  the  fixed or  variable  rate  or  rates per  annum
          specified in the applicable Pricing Supplement.

               Unless  otherwise  specified   in  the  applicable   Pricing
          Supplement,  the authorized  denominations of  the Notes  will be
          $10,000  or  any  larger  amount  that  is an  integral  multiple
          thereof.  The  Pricing  Supplement  relating to  each  Note  will
          describe the  price (expressed as  a percentage of  the aggregate
          principal  amount thereof) at which such Note will be issued; the
          date  on  which such  Note will  be  issued (the  "Original Issue
          Date");  any sinking  fund for  such Note  prior to  its Maturity
          Date;  and any other terms of such Note not inconsistent with the
          provisions of the Indenture.

          PAYMENT OF PRINCIPAL AND INTEREST

               Unless  otherwise  specified   in  the  applicable   Pricing
          Supplement, each  Note will bear interest from its Original Issue
          Date  or from the most  recent Interest Payment  Date, as defined
          below,  to which  interest on  such Note  has been  paid or  duly
          provided  for at the  fixed or variable  rate or  rates per annum
          stated therein until the principal amount thereof is paid or made
          available  for payment.  Interest on  each Note  will  be payable
          semiannually  each  April 1  and  October  1 (each  an  "Interest
          Payment  Date")  and  at  maturity or  upon  earlier  redemption;
          provided,  however,  that,  unless  otherwise  specified  in  the
          applicable Pricing  Supplement, the first payment  of interest on
          any  Note originally issued between  a Record Date  (March 15 for
          interest payable April 1,  and September 15 for  interest payable
          October 1) and an Interest Payment  Date will be made on the next

                                      S-2
     <PAGE>

          succeeding Interest Payment  Date to the registered holder  as of
          the Record Date in respect of such succeeding Interest Payment
          Date. Each  payment of  interest  in respect  of an Interest  
          Payment  Date  will  include interest  accrued  to  but excluding  
          such Interest Payment Date. Unless otherwise specified in the  
          applicable Pricing Supplement, interest  will be computed on  the 
          basis  of  a 360-day  year  consisting of  twelve  30-day months.

          REDEMPTION AND REPURCHASE

               The  Notes will not be  subject to any  sinking fund, unless
          otherwise specified in  the applicable  Pricing Supplement,  and,
          unless an Initial Redemption Date  (as defined in the  Indenture)
          is specified in  the applicable Pricing  Supplement, will not  be
          redeemable prior to their Maturity Date. If an Initial Redemption
          Date is so  specified with  respect to any  Note, the  applicable
          Pricing  Supplement  will also  specify  one  or more  redemption
          prices (expressed as a percentage of the principal amount of such
          Note) ("Redemption Prices") and  the redemption period or periods
          ("Redemption Periods")  during which such Redemption Prices shall
          apply. Unless otherwise specified  in the Pricing Supplement, any
          such Note shall be redeemable at the option of the Company at any
          time  on or after such  specified Initial Redemption  Date at the
          specified Redemption  Price applicable  to the  Redemption Period
          during  which such Note is to be redeemed, together with interest
          accrued to the redemption date.

          BOOK-ENTRY SYSTEM

               DTC  will act as securities depository for the Notes of each
          issue.  Except under the circumstances described below, the Notes
          will be issued in the form of one or more  fully registered notes
          that will be  deposited with, or on behalf of,  DTC or such other
          depository as  may be subsequently designated ("Depository"), and
          registered  in the name of Cede & Co. (DTC's partnership nominee)
          or  such other Depository, or its nominee, as may be subsequently
          designated. 

               So long as the Depository, or its nominee, is the registered
          owner of the Notes, such Depository or  such nominee, as the case
          may be,  will  be considered  the  owner of  such  Notes for  all
          purposes  under  the  Indenture,  including  notices  and voting.
          Payments of principal of,  and premium, if any, and  interest on,
          the  Notes will be made to the  Depository or its nominee, as the
          case may  be, as the registered  owner of such Notes.   Except as
          set forth below, owners of beneficial interests in the Notes will
          not  be entitled to have any individual Notes registered in their
          names,  will  not receive  or  be  entitled to  receive  physical
          delivery of any such Notes, and will not be considered the owners
          of  the  Notes under  the  Indenture.   Accordingly,  each person
          holding  a beneficial  interest  in  a  Note  must  rely  on  the
          procedures of the Depository and, if such person is not a  Direct
          Participant (as hereinafter defined), on procedures of the Direct
          Participant  through which  such  person holds  its interest,  to
          exercise any of the rights of the registered owner of such Note.

               If  the Depository  is at  any time  unwilling or  unable to
          continue  as  depository  and   a  successor  depository  is  not
          appointed  by the  Company, individual  registered Notes  will be
          issued  in  exchange for  the Notes  held  by the  Depository. In
          addition,  the Company, at any  time and in  its sole discretion,
          may  determine not to have the  Notes held by the Depository and,
          in  such event,  individual  registered Notes  will be  issued in
          exchange  for the  Notes held  by the  Depository.   In  any such
          instance, an owner of  a beneficial interest in the Notes will be
          entitled  to  physical  delivery  of individual  Notes  equal  in
          principal  amount to such  beneficial interest  and to  have such
          Notes registered in its name.  Individual Notes so issued will be
          issued  as registered  Notes in  denominations of $10,000  or any
          amount in excess thereof that is an integral multiple of $10,000,
          unless otherwise specified in the applicable Pricing Supplement.

               The following  is based  solely on information  furnished by
          DTC: 

               DTC is  a limited-purpose trust company  organized under the
          New York Banking Law, a "banking organization" within the meaning
          of  the New York  Banking Law,  a member  of the  Federal Reserve
          System, a  "clearing corporation" within  the meaning of  the New
          York Uniform Commercial Code, and  a "clearing agency" registered

                                      S-3
     <PAGE>

          pursuant  to the provisions of  Section 17A of  the Exchange Act.
          DTC  holds  securities  that  its  participants  ("Participants")
          deposit  with DTC.   DTC  also facilitates  the  settlement among
          Participants of  securities transactions, such  as transfers  and
          pledges, in deposited securities through  electronic computerized
          book-entry changes in Participants' accounts, thereby eliminating
          the  need  for  physical  movement  of  securities  certificates.
          Direct  Participants  include  securities  brokers  and  dealers,
          banks, trust companies, clearing corporations, and  certain other
          organizations ("Direct Participants").  DTC is owned by  a number
          of  its Direct Participants and  by The New  York Stock Exchange,
          Inc.,  the  American  Stock  Exchange,  Inc.,  and  the  National
          Association of Securities Dealers, Inc.  Access to the DTC system
          is  also  available  to  others such  as  securities  brokers and
          dealers,  banks,  and  trust  companies  that  clear  through  or
          maintain  a custodial  relationship  with a  Direct  Participant,
          either  directly or  indirectly ("Indirect  Participants").   The
          rules applicable to DTC and its Participants are on file with the
          Securities and Exchange Commission.

               Purchases  of the Notes under the DTC system must be made by
          or through Direct  Participants, which will receive  a credit for
          the  Notes  on DTC's  records.   The  ownership interest  of each
          actual  purchaser of each Note ("Beneficial Owner") is in turn to
          be  recorded on  the Direct  and Indirect  Participants' records.
          Beneficial Owners will not  receive written confirmation from DTC
          of their purchase, but Beneficial Owners  are expected to receive
          written confirmation  providing  details of  the transaction,  as
          well as periodic statements of their holdings, from the Direct or
          Indirect Participant  through which the  Beneficial Owner entered
          into the  transaction.  Transfers  of ownership interests  in the
          Notes  are to  be accomplished  by entries made  on the  books of
          Participants acting  on behalf of Beneficial  Owners.  Beneficial
          Owners will not receive certificates representing their ownership
          interests in the Notes, except in the event that use of the book-
          entry system for the Notes is discontinued.

               To facilitate  subsequent transfers, all Notes  deposited by
          Participants with DTC are  registered in the name  of Cede &  Co.
          The deposit of Notes with DTC  and their registration in the name
          of Cede  & Co. effect no change in beneficial ownership.  DTC has
          no  knowledge of the actual Beneficial Owners of the Notes; DTC's
          records reflect only the  identity of the Direct Participants  to
          whose accounts such Notes are credited,  which may or may not  be
          the Beneficial Owners.   The Participants will remain responsible
          for  keeping  account  of  their  holdings  on  behalf  of  their
          customers.

               Conveyance  of notices  and other  communications by  DTC to
          Direct  Participants,   by   Direct  Participants   to   Indirect
          Participants,   and   by   Direct   Participants   and   Indirect
          Participants   to  Beneficial   Owners   will   be  governed   by
          arrangements among  them, subject to any  statutory or regulatory
          requirements as may be in effect from time to time. 

               If  the Notes  of  any issue  are  redeemable prior to their
          maturity date, redemption notices shall be sent to Cede & Co.  If
          less than all of the Notes of any issue are being redeemed, DTC's
          practice  is to determine  by lot the  amount of the  interest of
          each Direct Participant in such issue to be redeemed. 

               Neither DTC nor Cede & Co. will consent or vote with respect
          to the Notes.  Under  its usual procedures, DTC mails an  Omnibus
          Proxy to  the Company as soon as  possible after the record date.
          The Omnibus  Proxy  assigns Cede  &  Co.'s consenting  or  voting
          rights  to those Direct Participants  to whose accounts the Notes
          are credited on the record date (identified in a listing attached
          to the Omnibus Proxy). 

               Principal and interest payments on the Notes will be made to
          DTC. DTC's practice is to credit Direct Participants' accounts on
          the  date on which interest  is payable in  accordance with their
          respective holdings shown on DTC's records, unless DTC has reason
          to believe that it will not receive payment on such payment date.
          Payments by Participants to Beneficial Owners will be governed by
          standing  instructions and  customary practices,  as is  the case
          with securities held for the accounts of customers in bearer form
          or registered in "street name", and will be the responsibility of
          such Participant and  not of  DTC, the Trustees  or the  Company,
          subject  to any statutory or regulatory requirements as may be in
          effect from time  to time.  Payment of  principal, premium, if 
          any, and interest to DTC  is  the  responsibility of  the  Company  
          or the  Corporate Trustee (with funds provided by the Company).   
          Disbursement of  such payments to  Direct Participants

                                      S-4                    
     <PAGE>

          shall  be the  responsibility of  DTC,  and disbursement  of such
          payments to the  Beneficial Owners shall be the responsibility of
          Direct and Indirect Participants.

               DTC  may  discontinue   providing  services  as   securities
          depository  with respect  to  the Notes  at  any time  by  giving
          reasonable notice to the Company and the Trustees.

               Neither  the   Company  nor  the  Trustees   will  have  any
          responsibility  or  liability  for  any  aspect  of  the  records
          relating  to or payments made  on account of beneficial interests
          in the  Notes or  for maintaining,  supervising or  reviewing any
          records relating to such beneficial interests.


                          SUPPLEMENTAL PLAN OF DISTRIBUTION


               Subject to  the  terms  and  conditions  set  forth  in  the
          Distribution  Agreement, dated  April  9, 1992,  as amended  (the
          "Distribution  Agreement"),  the Notes  are  being  offered on  a
          continuing basis  by  the Company  through the  Agents, who  have
          agreed to use reasonable best efforts to solicit purchases of the
          Notes. The Company will have  the sole right to accept offers  to
          purchase Notes and may reject any proposed purchase of Notes as a
          whole or  in part.  The Agents  shall  have the  right, in  their
          discretion reasonably exercised, to  reject any offer to purchase
          Notes, as a whole  or in part. The Company will pay  the Agents a
          commission  of from  .125% to  .875% of  the principal  amount of
          Notes, depending  upon maturity, for  sales made through  them as
          Agents.

               The  Company may also sell Notes to the Agents as principals
          for  their own accounts  at a discount  to be agreed  upon at the
          time  of  sale, or  the purchasing  Agents  may receive  from the
          Company  a commission or discount equivalent to that set forth on
          the  cover  page  hereof  in  the  case  of  any  such  principal
          transaction in which no other discount is agreed upon. Such Notes
          may be resold at  prevailing market prices, or at  prices related
          thereto, at the time of such resale, as determined by the Agents.
          The Company reserves the right to sell Notes directly on its  own
          behalf.  No commission will be payable on any Notes sold directly
          by the Company.

               The Agents, as  agents or  principals, may be  deemed to  be
          "underwriters" within the  meaning of the Securities Act  of 1933
          (the  "Act").   The Company  has agreed  to indemnify  the Agents
          against certain liabilities, including liabilities under the Act,
          or to contribute to payments that they may be required to make in
          respect  thereof.  The Company has agreed to reimburse the Agents
          for  certain expenses.   Goldman,  Sachs & Co.,  Lehman Brothers,
          Lehman Brothers Inc., and  Salomon Brothers Inc may from  time to
          time perform various investment banking services for the Company.

               Notes may also  be sold by the Agents to  or through dealers
          who may resell them to investors. The Agents may pay  all or part
          of their discount or commission to such dealers. Such dealers may
          be deemed to be "underwriters" within the meaning of the Act.

               The  Notes are a new issue of securities with no established
          trading market and will not be listed on any securities exchange.
          No  assurance can be given as to  the existence or liquidity of a
          secondary market for the Notes.

               In connection with the offering, the Agents may purchase and
          sell  the Notes  in  the open  market.   These  transactions  may
          include over-allotment and stabilizing transactions and purchases
          to cover short positions created by the Agents in connection with
          the offering.   Stabilizing transactions consist  of certain bids
          or purchases for the purpose of preventing or retarding a decline
          in the market price of the  Notes; and short positions created by
          the Agents involve the sale by  the Agents of a greater number of
          Notes than they are required to purchase from the  Company in the
          offering.   The  Agents also  may impose  a penalty  bid, whereby

                                      S-5 
     <PAGE>                                      

          selling concessions  allowed to broker-dealers in  respect of the
          securities sold in the offering may be reclaimed by the Agents if
          such securities  are repurchased by the Agents  in stabilizing or
          covering transactions.  These  activities may stabilize, maintain
          or otherwise  affect the market price of  the Notes, which may be
          higher  than the price that  might otherwise prevail  in the open
          market, and  these activities, if commenced,  may be discontinued
          at any time.  These transactions may be effected in the over-the-
          counter market or otherwise.




                                      S-6
     <PAGE>

          PROSPECTUS
          ----------

                                 $45,000,000
                          SECURED MEDIUM-TERM NOTES

                           MDU RESOURCES GROUP, INC.

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

               MDU Resources Group, Inc.  (the "Company") intends from time
          to  time to offer up to $45,000,000 aggregate principal amount of
          its  Secured Medium-Term  Notes  (the "Notes")  as an  additional
          series of  the Company's  first mortgage bonds  having maturities
          ranging from 9 months to 35 years from the date of issuance. Each
          Note  will bear  interest at  a rate  or rates determined  by the
          Company  at or prior to the sale thereof. The aggregate principal
          amount, interest rate or  rates, interest payment dates, purchase
          price,  maturity and redemption terms,  if any, of  each issue of
          the  Notes  will  be set  forth  in  a  Prospectus Supplement  or
          Prospectus  Supplements  (the "Prospectus  Supplement") including
          Prospectus Supplements to be filed with respect to  each issuance
          and sale of Notes. The terms upon which each issuance and sale of
          Notes are offered,  together with  the names of  the agents  (the
          "Agents")   and  the   Agents'  commissions   or  discounts,   if
          applicable, will also be set forth in Prospectus Supplements. 

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

            THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE
          SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES
              COMMISSION NOR HAS THE SECURITIES AND EXCHANGE COMMISSION
                  OR ANY STATE SECURITIES COMMISSION PASSED UPON THE
                       ACCURACY OR ADEQUACY OF THIS PROSPECTUS.
                         ANY REPRESENTATION TO THE CONTRARY 
                                IS A CRIMINAL OFFENSE.

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

               The Company may sell the Notes through underwriters, dealers
          or  Agents, or directly to one or more purchasers. The Prospectus
          Supplement  will set forth the  names of underwriters, dealers or
          Agents, if any, any applicable  commissions or discounts, and the
          net proceeds  to the Company  from the  sale of the  Notes.   See
          "Plan   of   Distribution"  for   possible   indemnification  and
          contribution arrangements for the Agents. 

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

                  The date of this Prospectus is September 15, 1997

     <PAGE>

                                AVAILABLE INFORMATION


               The Company is subject  to the informational requirements of
          the Securities  Exchange Act of  1934, as amended  (the "Exchange
          Act"),  and  in accordance  therewith  files  reports, proxy  and
          information statements, and other information with the Securities
          and  Exchange  Commission  (the   "SEC").    Reports,  proxy  and
          information  statements,  and  other  information  filed  by  the
          Company  can  be inspected  and  copied at  the  public reference
          facilities  maintained by  the  SEC at  450  Fifth Street,  N.W.,
          Washington,  D.C. 20549,  and at  the SEC's  regional offices  at
          Seven  World Trade Center, Suite 1300, New York, New York, 10048,
          and at  500 West Madison  Street, Suite  1400, Chicago,  Illinois
          60661.  Copies  of such material  can also be  obtained from  the
          Public  Reference Section of the  SEC at 450  Fifth Street, N.W.,
          Washington, D.C. 20549, at prescribed rates.  The SEC maintains a
          Web site  (http://www.sec.gov) that contains  reports, proxy  and
          information    statements,    and    other   information    filed
          electronically by the Company.   The Company's common stock,  par
          value $3.33 (the "Common  Stock"), and the appurtenant Preference
          Share Purchase Rights,  are listed  for trading on  the New  York
          Stock  Exchange  (the  "NYSE")   and  on  the  Pacific  Exchange.
          Reports, proxy and information  statements, and other information
          concerning  the Company can also  be inspected at  the offices of
          the NYSE and the Pacific Exchange.

               Security holders  of the  Company may obtain,  upon request,
          copies  of  an  annual  report  to  security  holders  containing
          financial information  that has  been audited and  reported upon,
          with an opinion expressed by, an independent public accountant.


                   INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


               The following documents heretofore filed by the Company with
          the SEC are hereby incorporated by reference in this Prospectus:

               1.   The Company's Annual Report  on Form 10-K for  the year
                    ended December 31, 1996;

               2.   The Company's  Quarterly Reports  on Form 10-Q  for the
                    quarters ended March 31, 1997 and June 30, 1997; and

               3.   The Company's  Current Reports  on Form 8-K  dated June
                    26, 1997 and August 25, 1997.

               All documents subsequently filed by the Company with the SEC
          pursuant  to Sections 13(a), 13(c),  14 or 15(d)  of the Exchange
          Act  prior  to  the termination  of  the  offering  made by  this
          Prospectus shall  be deemed  to be  incorporated by reference  in
          this Prospectus.

               Any  statement  contained in  a  document  incorporated   or
          deemed to be incorporated  by reference herein shall be  modified
          or  superseded for purposes of this Prospectus to the extent that
          a statement contained herein  or in any other  subsequently filed
          document  which is or is  deemed to be  incorporated by reference
          herein modifies or  supersedes such statement.  Any  statement so
          modified or superseded shall not be deemed, except as so modified
          or superseded, to constitute a part of this Prospectus.

               The Company  hereby undertakes to provide  without charge to
          each  person, including any beneficial  owner, to whom  a copy of
          this  Prospectus  has been  delivered,  on  the written  or  oral
          request of any such person, a copy of any or all of the documents
          referred to above which have been or may  be incorporated in this
          Prospectus by  reference, other than exhibits  to such documents,
          unless  such exhibits are  specifically incorporated by reference
          into  such documents.    Requests for  copies  of such  documents
          should  be addressed to  Office of  the Treasurer,  MDU Resources

                                      -2-
     <PAGE>

          Group,  Inc., 400  North  Fourth Street,  Bismarck, North  Dakota
          58501, telephone (701) 222-7900.  

               The information  relating to  the Company contained  in this
          Prospectus does not  purport to  be comprehensive  and should  be
          read together  with  the  information  contained in  any  or  all
          documents  which  have  been  or  may  be  incorporated  in  this
          Prospectus by reference.


                                     THE COMPANY


               The  Company  is  a  diversified  natural  resource  company
          incorporated under the  laws of  the state of  Delaware in  1924.
          It's  principal executive offices are at 400 North Fourth Street,
          Bismarck, North Dakota 58501, telephone (701) 222-7900.

               Montana-Dakota Utilities Co., the public utility division of
          the  Company, provides  electric and/or  natural gas  and propane
          distribution  service  at  retail  to 256  communities  in  North
          Dakota, eastern  Montana, northern  and western South  Dakota and
          northern Wyoming, and owns and operates electric power generation
          and  transmission facilities.   The  Company, through  its wholly
          owned    subsidiary,    Centennial    Energy    Holdings,    Inc.
          ("Centennial"),  owns Williston Basin Interstate Pipeline Company
          ("Williston Basin"), Knife River Corporation ("Knife River"), the
          Fidelity Oil  Group ("Fidelity  Oil") and Utility  Services, Inc.
          ("Utility Services").   Williston Basin produces  natural gas and
          provides  underground  storage,   transportation  and   gathering
          services through an  interstate pipeline system  serving Montana,
          North Dakota, South  Dakota and Wyoming  and, through its  wholly
          owned subsidiary,  Prairielands Energy Marketing, Inc., seeks new
          energy  markets while  continuing to  expand present  markets for
          natural gas and propane.   Knife River, through its  wholly owned
          subsidiary,  KRC Holdings,  Inc.  and its  subsidiaries,  surface
          mines and  markets aggregates and related  construction materials
          in  Oregon, California,  Alaska and Hawaii.   In  addition, Knife
          River  surface mines and markets low sulfur lignite coal at mines
          located in Montana and  North Dakota.  Fidelity Oil  is comprised
          of  Fidelity Oil Co. and  Fidelity Oil Holdings,  Inc., which own
          oil  and natural gas interests throughout  the United States, the
          Gulf  of Mexico and  Canada through investments  with several oil
          and natural gas  producers.  Utility Services, through its wholly
          owned  subsidiaries, International  Line Builders, Inc.  and High
          Line Equipment, Inc., installs and  repairs electric transmission
          and distribution lines  in the western  United States and  Hawaii
          and provides related construction supplies and equipment.



                                      -3-
     <PAGE>

                           CERTAIN FINANCIAL INFORMATION(1)
                                (DOLLARS IN THOUSANDS)


                                                           SIX MONTHS ENDED
                             YEARS ENDED DECEMBER 31,          JUNE 30,
                           ---------------------------    ------------------

                              1994     1995     1996        1996      1997
                            -------- -------- --------    --------  --------
          Income Summary:

               Operating 
                revenues .  $449,528  $464,246  $514,701  $236,742  $265,192
              
               Operating 
                income . .    78,175    90,576   111,525    48,283    49,204
              
               Net income .   39,845    41,633    45,470    21,735    23,337



                                           DECEMBER 31,
                                               1996           JUNE 30, 1997
                                          ---------------    ---------------
                                            AMOUNT      %     AMOUNT       %
                                           --------    --    --------     --

          Capital Structure:                                           

            Long-term debt
             (including unamortized         
              discount) . . . . . . . .    $280,666    43.3   $258,306   40.5
          
            Preferred stock  . . . .         16,800     2.6     16,800    2.6

           Common stockholders'    
             investment . . . . . . . .     350,674    54.1    363,688   56.9
                                           --------    ----   --------   ----
                    Total(2)  . . . . .    $648,140   100.0   $638,794  100.0
                                           ========   =====   ========  =====

          (1)  This  information should  be  read in  conjunction with  the
               Company's  Annual Report  on Form  10-K for  the year  ended
               December  31, 1996 and Quarterly Report on Form 10-Q for the
               quarter ended June 30, 1997.

          (2)  Excludes amounts due within one year.


                          RATIO OF EARNINGS TO FIXED CHARGES

               The consolidated Ratio of Earnings to  Fixed Charges for the
          twelve months ended June 30, 1997 was 2.83.   The following table
          sets  forth the consolidated  Ratio of Earnings  to Fixed Charges
          for the annual periods indicated:

                               YEARS ENDED DECEMBER 31,

                        1992     1993    1994    1995    1996

                        2.51    3.04*    2.95    3.10    2.75

          *  Before cumulative  effect of  accounting change  of $5,521,000
          (net of income taxes).

                                      -4-
     <PAGE>

                                   USE OF PROCEEDS


               The  Company is  offering  hereby a  maximum of  $45,000,000
          aggregate principal  amount of Notes.  Unless otherwise set forth
          in a Prospectus Supplement, the net proceeds from the sale of the
          Notes will be used  for the refunding of  outstanding obligations
          (which may  include the  redemption of all  $20,000,000 principal
          amount of the  Company's First Mortgage Bonds, 9-1/8%  Series Due
          October  1,  2016),  for  corporate  development  (including  the
          acquisition of business assets),  and for other general corporate
          purposes.


                                 PLAN OF DISTRIBUTION


               The  Notes may  be  offered on  a  continuing basis  by  the
          Company through the Agents, each  of which will agree to use  its
          reasonable best efforts to solicit  offers to purchase the Notes.
          The  Company may  also sell  the Notes  to any  of the  Agents at
          negotiated discounts for  its own account or for resale to one or
          more  investors at  varying prices  related to  prevailing market
          prices at the time of resale, as determined by such Agent, or for
          resale to  one or more  dealers at a  discount, as  determined by
          such Agent. 

               A Prospectus  Supplement relating  to an  issue and sale  of
          Notes will  set forth the  terms of  the offering of  such Notes,
          including  the  name  or names  of  any  Agents  or dealers,  the
          purchase  price of such Notes,  the proceeds to  the Company from
          such sale,  any discounts or  commissions to Agents,  any initial
          public offering price and any discounts or concessions allowed or
          reallowed or paid to dealers.

               Under agreements  that may  be entered into  by the  Company
          with the Agents,  Agents who participate  in the distribution  of
          the  Notes  may be  entitled  to indemnification  by  the Company
          against  certain  liabilities,  including liabilities  under  the
          Securities  Act of 1933, or  to contribution by  the Company with
          respect to payments  which the Agents may be required  to make in
          respect thereof.


                                 DESCRIPTION OF NOTES


               The Notes  constitute a series of first mortgage bonds under
          and secured  by an Indenture of Mortgage dated as of May 1, 1939,
          from  the Company to The New York  Trust Company (The Bank of New
          York,  successor  Corporate  Trustee)  and  A.C.   Downing  (W.T.
          Cunningham,  successor  Individual  Trustee),  as  Trustees,  and
          indentures  supplemental  thereto,   including  the   Forty-fifth
          Supplemental  Indenture  which  contains  a  Restatement  of  the
          Indenture,  and  which  may  include  one  or  more  supplemental
          indentures relating  to the Notes, all of  which are collectively
          referred to as the  "Indenture." All of the first  mortgage bonds
          issued and outstanding under  the Indenture, including the Notes,
          are hereinafter referred to as "First Mortgage Bonds." 

               The  Notes will be issuable only in registered form, without
          coupons, in  denominations  of  $10,000  and  integral  multiples
          thereof  unless  otherwise specified  in  the  applicable Pricing
          Supplement,  and will be exchangeable for other Notes of the same
          series with the same  interest rate or rates, maturity  and other
          terms, in equal  aggregate amounts.   No service  charge will  be
          made to holders of Notes for  any transfer or exchange of  Notes,
          but the Company may require payment  of a sum sufficient to cover
          any tax  or  governmental  charge  incident to  the  transfer  or
          exchange.   Transfers and exchanges  of Notes may be  made at the
          Corporate  Trust Office of  The Bank of  New York, New  York, New
          York. 

               Reference  is  made to  the  Prospectus  Supplement for  the
          following terms relating to each of the Notes (among others): (i)
          the  designation, series  and aggregate  principal amount  of the
          Notes; (ii) the  percentage of  their principal  amount at  which

                                      -5-

     <PAGE>

          such Notes will be issued; (iii) the date on which the Notes will
          mature; (iv)  the rate or rates per annum at which the Notes will
          bear  interest;  (v) the  dates on  which  such interest  will be
          payable;  (vi) the place where  the principal of  and interest on
          the  Notes will be payable;  (vii) redemption terms,  if any; and
          (viii) any other terms or provisions relating to such Notes which
          are not inconsistent with the provisions of the Indenture. 

               The following statements are,  in part, summaries of certain
          provisions  contained in the Indenture  and do not  purport to be
          complete.   Certain of  the terms used  herein without definition
          are defined in  the Indenture, to which  reference is made  for a
          complete statement of the terms and conditions of the Notes.

               REDEMPTION OF NOTES.   Reference is  made to the  Prospectus
          Supplement for the redemption terms of the Notes, if any.  If, at
          the  time notice  is  given, the  redemption  monies are  not  on
          deposit with the  Corporate Trustee, the  redemption may be  made
          subject  to their  receipt  on  or  before  the  date  fixed  for
          redemption  and such  notice shall  be of  no effect  unless such
          monies are received.  (45th Supp. Ind., Part II, Art. V.) 

               SECURITY.  In  the opinion  of the General  Counsel for  the
          Company, the Notes will be secured, together with all other First
          Mortgage  Bonds now or hereafter issued under the Indenture, by a
          valid  and direct first mortgage lien on substantially all of the
          fixed properties owned  and all franchises  held by the  Company,
          subject to the lien of taxes for the current year and the lien of
          taxes  and   assessments  not  yet  delinquent   and  to  certain
          exceptions  and reservations which do not, in the opinion of such
          counsel, materially affect the Company's title to or its right to
          use  such properties.   There  are excepted  from the  lien cash,
          receivables  and  securities  (including  the  capital  stock  of
          Centennial,   Williston  Basin,   Knife   River,  the   companies
          comprising   Fidelity  Oil,  Utility   Services  and   any  other
          subsidiaries);   certain   contracts;  merchandise,   appliances,
          materials or  supplies; electric  energy, gas, steam  and certain
          other products;  and automobiles, tractors, ships,  railroad cars
          and  aircraft and  various other  transportation equipment.   The
          property of subsidiaries,  including Centennial, Williston Basin,
          Knife  River, the  companies  comprising  Fidelity  Oil,  Utility
          Services and any other  subsidiaries, is not subject to  the lien
          of  the Indenture.  The  Company may release  property subject to
          the  lien of  the  Indenture against  various credits,  including
          property which is already also subject to the lien, but which has
          not  yet  been used  as  a  credit under  any  provisions  of the
          Indenture.   Property not used  as the basis for  the issuance of
          First Mortgage Bonds or otherwise as a credit under the Indenture
          may  in effect  be  released without  substitution of  equivalent
          property.  

               The Indenture contains provisions for subjecting to the lien
          thereof property which the Company may hereafter acquire, subject
          to  liens existing  thereon at  the date  of acquisition,  and to
          limitations  in the  case  of consolidation,  merger  or sale  of
          substantially all of the Company's assets.  (Orig. Ind., Granting
          Clauses; 45th Supp. Ind., Part II, Art. XII.) 

               ISSUANCE  OF  ADDITIONAL  BONDS.    The  Company  may  issue
          additional First Mortgage Bonds ranking equally with the Notes in
          a principal amount equal to (a)  70% of the net bondable value of
          property additions  acquired by  the Company,  (b) the  amount of
          cash  deposited with the Corporate Trustee, and (c) the amount of
          refundable  First Mortgage  Bonds  surrendered  to the  Corporate
          Trustee.  (45th Supp. Ind., Part II, Secs. 3.04, 3.05 and 3.06.) 

               The   Notes  will  be  issued  against  property  additions,
          refunded First Mortgage Bonds and/or the deposit of cash. On June
          30,  1997,  the  Company  had  approximately  $178.7  million  of
          available property additions and $133.6 million of refunded First
          Mortgage Bonds.  See "Description of Notes - Security." 

               With certain exceptions in the case of (c) above, additional
          First Mortgage Bonds  may be issued  only if net earnings  of the
          Company available for interest after depletion, as defined in the
          Indenture, for any twelve  consecutive calendar months within the
          fifteen calendar months immediately  preceding the month in which
          the application for such additional First Mortgage Bonds is made,
          are in  the aggregate equal to  at least two times  the amount of
          the annual  stated interest charges  on all First  Mortgage Bonds

                                      -6-

     <PAGE>

          thereafter to be outstanding, and on all permitted equal or prior
          lien debt,  if any.   (45th Supp. Ind.,  Part II, Secs.  1.01 and
          3.03.)   For  the  twelve months  ended June  30,  1997, the  net
          earnings of  the Company  available for interest  after depletion
          were  $60.3 million  or  5.49 times  the  annual stated  interest
          charges  on all First Mortgage Bonds and permitted equal or prior
          lien debt outstanding  on that date,  which would have  permitted
          the  Company  to  issue  approximately $256.0  million  of  First
          Mortgage Bonds. 

               Property available  for use as  property additions  includes
          property  useful in the energy  business in any  form (other than
          gas but including  gas distribution property) and water and steam
          heat  property.   Such property  may be  located anywhere  in the
          United  States  of America  or its  coastal  waters and  may also
          include  space satellites  (including  solar  power  satellites),
          space stations and other analogous facilities.  (45th Supp. Ind.,
          Part II, Sec. 1.01.)

               RESTRICTIONS ON DIVIDENDS.  So long as  any of the Notes are
          outstanding, the Company may declare and pay dividends in cash or
          property on its Common Stock only out of Surplus, as defined,  or
          out of  net profits for the  fiscal year or  the preceding fiscal
          year.   However, the  Company may  not pay  dividends out of  net
          profits  if  the Capital  of the  Company,  as defined,  has been
          diminished to a specified extent.  (45th Supp. Ind., Part I, Sec.
          2.01).

               MAINTENANCE  AND DEPRECIATION  PROVISIONS.   The  Company is
          required to  make  such expenditures  as  shall be  necessary  to
          maintain  the mortgaged property in  good repair, except that the
          Company  may abandon  any property,  and to  make provisions  for
          depreciation  and for  depletion  of depletable  fixed assets  in
          accordance with good accounting  practices and in accordance with
          any  applicable  rules   of  any   regulatory  authority   having
          jurisdiction.  (45th Supp. Ind., Part II, Sec. 6.06.) 

               MODIFICATION OF  THE INDENTURE.  Modifications  of the terms
          of the Indenture may be  made with the consent of the  Company by
          an  affirmative vote  of  at least  60%  in principal  amount  of
          outstanding First Mortgage Bonds and of at least 60% in principal
          amount  of  outstanding  First   Mortgage  Bonds  of  any  series
          especially   affected  by   such   modification;   but  no   such
          modification may be made  which will affect the terms  of payment
          of  the principal  at  maturity of,  or  interest on,  any  First
          Mortgage Bond.  (45th Supp. Ind., Part II, Art. XV.) 

               EVENTS  OF DEFAULT.  "Events of default" include the failure
          to pay principal, failure for 30 days to pay interest  or to make
          any required deposit in  any fund for the purchase  or redemption
          of  First   Mortgage  Bonds   (including  any  sinking   fund  or
          improvement and sinking fund), failure for 90 days after  written
          notice  to perform  any  other covenant,  and  various events  in
          bankruptcy or insolvency.  (45th Supp. Ind., Part II, Art. IX.) 

               The  Trustees are required to give  notice to Bondholders of
          any continuing event of default known to them, but other than for
          a  default in the  payment of principal or  interest or a sinking
          fund installment,  the Trustees may  withhold such notice  if the
          responsible  officers  of the  Corporate  Trustee  in good  faith
          determine  that such  withholding  is  in  the interests  of  the
          Bondholders.  (45th Supp. Ind., Part II, Sec. 13.03.) 

               The  Company  must  file  an  annual  certificate  with  the
          Corporate Trustee as to compliance with the Indenture. 

               CONCERNING  THE  TRUSTEES.   The Bank  of  New York  acts as
          Corporate Trustee under the  Indenture.  The Company may,  in the
          regular course of business,  obtain short-term funds from several
          banks, including The Bank of New York.

                                      -7-

     <PAGE>
                                       EXPERTS

               The  Company's  audited  consolidated  financial  statements
          incorporated  in this  Prospectus by  reference to  the Company's
          Annual Report on Form 10-K for  the year ended December 31, 1996,
          have  been audited  by  Arthur Andersen  LLP, independent  public
          accountants, as  indicated in their report  with respect thereto,
          and are incorporated herein in reliance upon such report and upon
          the authority of said firm as experts in accounting and auditing.

               The information set  forth in the estimates, dated January 9
          and 31, 1997, of  Ralph E. Davis Associates, Inc.  concerning oil
          and  natural  gas reserves,  appearing  in  the Company's  Annual
          Report on  Form 10-K for the  year ended December  31, 1996, have
          been reviewed and verified by Ralph E. Davis Associates, Inc. and
          have been incorporated  herein in reliance upon  the authority of
          said firm as experts.

               The  information set forth in the report, dated May 9, 1994,
          of Weir International Mining Consultants relating to lignite coal
          reserves of Knife River, appearing in the Company's Annual Report
          on  Form  10-K for  the year  ended December  31, 1996,  has been
          reviewed and  verified by  Weir International  Mining Consultants
          and has been incorporated  herein in reliance upon the  authority
          of said firm as experts.


                                   LEGAL OPINIONS

               The  validity  of the  Notes has  been  passed upon  for the
          Company by Lester  H. Loble,  II, Esq., General  Counsel for  the
          Company, and also by Reid & Priest LLP, 40 West  57th Street, New
          York, New  York 10019, and  for any Agent  by Berlack,  Israels &
          Liberman LLP, 120 West 45th Street, New York, New York 10036.




                                      -8-

     <PAGE>

        ====================================================================
            No dealer, salesperson or other  person has been authorized  to
          give any information  or to make  any representations other  than
          those  contained  in  this Prospectus  Supplement  (including any
          accompanying  Pricing   Supplement)   and  the   Prospectus,   in
          connection  with  the offer  contained herein,  and, if  given or
          made, such information or representations must not be relied upon
          as having been authorized by the Company or by any of the Agents.
          Neither the delivery of this Prospectus Supplement (including any
          accompanying Pricing Supplement) and  the Prospectus nor any sale
          made  hereunder  shall,  under   any  circumstances,  create   an
          implication that  there has been no change  in the affairs of the
          Company since the date  as of which information is  given in this
          Prospectus   Supplement   (including  any   accompanying  Pricing
          Supplement)   and  the  Prospectus.  This  Prospectus  Supplement
          (including   any  accompanying   Pricing   Supplement)  and   the
          Prospectus do not  constitute an offer or solicitation  by anyone
          in  any jurisdiction in which  such offer or  solicitation is not
          authorized  or  in   which  the  person  making   such  offer  or
          solicitation is not qualified to do so or to anyone to whom it is
          unlawful to make such offer or solicitation.

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

                                  TABLE OF CONTENTS
                                                                       PAGE
                                                                       ----
                                PROSPECTUS SUPPLEMENT

          Description of Notes  . . . . . . . . . . . . . . . . . . .   S-2
          Supplemental Plan of Distribution . . . . . . . . . . . . .   S-5


                                      PROSPECTUS

          Available Information . . . . . . . . . . . . . . . . . . . .   2
          Incorporation of Certain Documents by Reference . . . . . . .   2
          The Company . . . . . . . . . . . . . . . . . . . . . . . . .   3
          Certain Financial Information . . . . . . . . . . . . . . . .   4
          Ratio of Earnings to Fixed Charges  . . . . . . . . . . . . .   4
          Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . .   5
          Plan of Distribution  . . . . . . . . . . . . . . . . . . . .   5
          Description of Notes  . . . . . . . . . . . . . . . . . . . .   5
          Experts . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
          Legal Opinions  . . . . . . . . . . . . . . . . . . . . . . .   8

          ==================================================================


          ==================================================================




                                     $45,000,000


                                    MDU RESOURCES
                                     GROUP, INC.

                              SECURED MEDIUM-TERM NOTES,
                                       SERIES A




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

                                PROSPECTUS SUPPLEMENT

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



                                 GOLDMAN, SACHS & CO.
                                   LEHMAN BROTHERS
                                 SALOMON BROTHERS INC





          =================================================================



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