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                                                                   EXHIBIT 10.25


                 INTERRUPTIBLE TRANSPORTATION SERVICE AGREEMENT


                               RATE SCHEDULE IT-1


       This Interruptible Transportation Service Agreement ("Agreement") by and
between Northern Natural Gas Company, a Delaware Corporation ("Northern"), and
Continental Natural Gas, Inc., a Marketer ("Shipper"), covering the
transportation of natural gas on an interruptible basis by Northern for Shipper
on behalf of    N/A    , a _______________, as more particularly described
herein, is entered into in accordance with the following terms and conditions:

1.     This transportation service shall be provided pursuant to Subpart G of
       Part 284 of the Federal Energy Regulatory Commission's ("Commission" or
       "F.E.R.C.") regulations.

2.     INTERRUPTIBLE TRANSPORTATION QUANTITY:  Up to 32,000 MMBtu per day.

3.     TERM:  This Agreement shall become effective on the date of initial
       delivery and shall continue in full force and effect for a primary term
       of One (1) year and month to month thereafter, unless and until
       terminated by either party after the primary term upon thirty (30) days'
       prior written notice to the other party.  Initial delivery hereunder
       shall not commence until this Agreement is executed and received by
       Northern.  Notwithstanding, should Northern at any time in its sole
       discretion elect to terminate, on a non-discriminatory basis, all
       transportation services commenced on or after October 9, 1985, pursuant
       to Part 284 of the Commission's Regulations, then Northern may terminate
       this agreement upon five (5) days' written notice to Shipper.

4.     RATE:  Unless Northern agrees in writing to a lower rate, Shipper shall
       pay Northern each month for transportation service rendered hereunder of
       the maximum rates and charges in effect from time to time under Rate
       Schedule IT-1, or any effective superseding rate schedule on file with
       the Commission or any successor thereto.

       Addresses for Shipper:

              FOR NOTICES                                FOR INVOICES
              -----------                                ------------
       Continental Natural Gas, Inc.              Continental Natural Gas, Inc.
       P.O. Box 21470                             P.O. Box 21470
       Tulsa, OK 74121                            Tulsa, OK 74121
       Attn: Diane Lawler                         Attn:  Diane Lawler
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5.     When this Agreement become effective, it shall supersede and cancel the
       following transportation service agreement(s) between the parties
       hereto:       None

6.     ADDITIONAL TERMS AND CONDITIONS:  The additional Terms and Conditions
       listed on the reverse side hereof and the Appendices incorporated herein
       are made a part of this Agreement.

7.     OTHER PROVISIONS:  See Appendices attached hereto which are hereby made
       a part hereof and incorporated herein.

       7.1    Shipper understands and acknowledges that Shipper is responsible
              for ensuring that the upstream transporting pipeline(s) which
              deliver(s) gas for Shipper to Northern at the Point(s) of Receipt
              has capacity on its system to deliver gas for Shipper's account,
              and that the downstream party(s) which receive(s) gas from
              Northern at the Point(s) of Delivery hereunder for Shipper's
              account has capacity on its system to receive such gas.
              Accordingly, Shipper shall remain responsible under this
              Agreement for all charges set forth in Section 11-3, "Applicable
              Rate Schedule, Incorporation by Reference" of this Agreement,
              notwithstanding Shipper's inability to cause gas to be delivered
              to Northern at the Point(s) of Receipt and/or received by the
              downstream party(s) at the Point(s) of Delivery hereunder.

       This Interruptible Transportation Service Agreement when executed by
       Shipper constitutes a contract with Northern Natural Gas Company, for
       the transportation of natural gas, subject to the terms and conditions
       appearing on the face and reverse side hereof and the attached
       Appendices.


       SHIPPER:

       CONTINENTAL NATURAL GAS,INC.               NORTHERN NATURAL GAS COMPANY

       By                                         By                            
          -------------------------                  ---------------------------

       TITLE                                      TITLE                         
             ----------------------                     ------------------------

       Date Executed:                             Date Executed:                
                      -------------                              ---------------

       Attest:                     
               --------------------


8.     QUANTITIES OF GAS TO BE TRANSPORTED

       8.1    Northern agrees to receive and transport for Shipper, on an
              interruptible basis, quantities of natural gas up to





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              the Interruptible Transportation Quantity set forth in Section 2
              of this Agreement.

       8.2    Northern agrees to receive and transport natural gas for Shipper
              in excess of the Interruptible Transportation Quantity provided
              that Northern has determined that it has sufficient capacity to
              transport such excess volumes.

9.     POINT(S) OF RECEIPT, DELIVERY AND PRESSURES

       9.1    Shipper agrees to tender, or cause to be tendered, gas for
              transportation at the Point(s) of Receipt identified in Appendix
              "A" at pressures sufficient to effect delivery into Northern's
              facilities, as such pressure may vary from time to time, not to
              exceed the maximum allowable operating pressure, provided
              further, Northern shall have no obligation to provide compression
              and/or alter its system operation to enable Shipper to effectuate
              said deliveries.

       9.2    Northern agrees to transport and deliver gas to Shipper, or for
              Shipper's account, at the Point(s) of Delivery identified in
              Appendix "A", provided further, Northern shall have no obligation
              to provide compression and/or alter its system operation to
              effectuate said deliveries.

10.    TERMINATION

       10.1   Notwithstanding the "Term" set forth in paragraph 3 on the face
              of this Agreement, this Agreement shall terminate upon written
              notice by Northern to Shipper within forty-five (45) days from
              the effective date of this Agreement if Northern determines that
              incomplete or inaccurate information has been submitted to
              effectuate this transportation service which causes such service
              not to comply with the Commission's regulations.

       10.2   Termination of this Agreement shall not relieve Northern and
              Shipper of the obligation to correct any imbalances hereunder, or
              Shipper to pay money due hereunder to Northern.

11.    GENERAL

       11.1   This Agreement in all respects shall be subject to the provisions
              of Rate Schedule IT-1, as well as the General Terms and
              Conditions of Rate Schedule FT-1, if applicable, contained in
              Northern's F.E.R.C. Gas Tariff, Third Revised Volume No. 1, as
              may be revised from time to time.





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       11.2   Northern's IT-1 Rate Schedule and the General Terms and
              Conditions set forth in Northern's FT-1 Rate Schedule, as may be
              revised from time to time, are hereby incorporated by reference
              and made a part hereof.

       11.3   Northern shall have the right to file and seek Commission
              approval under Section 4 of the Natural Gas Act ("NGA") to change
              any rates, charges or other provisions set forth in Rate Schedule
              IT-1, or any superseding rate schedule, and to place such charges
              in effect in accordance with Section 4(c) of the NGA.  This
              Agreement shall be deemed to include such charges and any changes
              which become effective by operation of law and F.E.R.C. Order,
              without prejudice to Shipper's right to protest the same.

12.    NOTICES

       12.1   Any notice, statement, or bill provided for in this Agreement
       shall be in writing and shall be considered as having been given if
       delivered personally or if mailed by United States mail, postage
       prepaid, or if sent by express mail, overnight delivery, telex, telecopy
       or any other mutually agreeable means of electronic transmission.

       a.     To Shipper when sent to the address set forth on the face of this
              agreement.

       b.     To Northern:
              Accounting Matters:          Northern Natural Gas Company
                                           P.O. Box 1188
                                           Houston, Texas 77251-1188
                                           ATTN:  Gas Accounting Dept.

              All Notices:                 Northern Natural Gas Company
                                           P.O. Box 1188
                                           Houston, Texas 77251-1188
                                           ATTN:  Transportation Services
                                           Administration

              Payments:                    Northern Natural Gas Company
                                           Citibank, N.A.
                                           399 Park Avenue
                                           Account No. 4049-8026
                                           New York, New York 10043

12.2   Either party may notify the other in writing of the address of the
       person or persons who shall have authority to act for such party in
       connection with the operation of pipelines, facilities, wells, and
       leases in connection with this Agreement, and operating notices shall
       thereafter be served upon such person or persons.





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       SECTION 7.  OTHER PROVISIONS

7.2    Subject to the terms of this Agreement as it may be amended from time to
       time, Shipper may deliver or cause to be delivered to Northern, at the
       suction side of Northern's Fort Buford Compressor Station located in
       Section 4, Township 151 North, Range 103 West, McKenzie County, North
       Dakota ("Fort Buford"), all or a portion of the interruptible quantities
       of gas under this Agreement that Shipper desires Northern to compress.
       Northern agrees to accept and compress, on an interruptible basis, such
       gas delivered to it by Shipper under this Agreement, and to redeliver
       such gas for the account of Shipper to Northern Border Pipeline Company
       ("NBPL") at the discharge side of Northern's Fort Buford Compressor
       Station for subsequent transportation by NBPL.  For the points listed on
       Appendix "A", Shipper agrees to pay the transportation rates set forth
       in Northern's F.E.R.C. Gas Tariff which includes the charge for
       compression service at Fort Buford; provided, however, in the event
       Shipper's gas compressed hereunder is not delivered to Northern for
       transportation downstream of Fort Buford, Shipper agrees to pay
       Northern's applicable rate for the compression service at Fort Buford.





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                                   APPENDIX A



          TRANSPORTATION SERVICE AGREEMENT UNDER THE IT-1 RATE SCHEDULE



                     SHIPPER:  Continental Natural Gas, inc.



           DATE:  August 1, 1992     SUPERSEDED APPENDIX DATED:  DNA*



           Part I.  Delivery Point Legal Descriptions










*  Does Not Apply





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