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                                                                 EXHIBIT 10.20


                                     ENRON
                          NORTHERN NATURAL GAS COMPANY

            P. O. Box 1188 Houston, Texas 77251-1188 (713) 853-6161



February 16, 1996

Mr. Scott Longmore
Continental Natural Gas, Inc.
1400 Boston Building, Suite 500
1412 S. Boston
Tulsa, Oklahoma 74119

Re:      Amendment to CR#101124

Northern Natural Gas Company (Northern) and Continental Natural Gas, Inc.
(Continental) are Parties to a Firm Throughput Service Agreement (CR#101124)
executed simultaneously herewith. Northern and Continental hereby agree to
amend CR#101124 as stated herein:

1.       Rate. The commodity and demand rates stated in CR#101124 shall be
         superseded by the following combined discounted commodity and demand
         rate, which rate shall be applicable to transportation from the
         Primary Receipt Points to the Primary Delivery Points designated in
         CR#101124: $0.04 per MMBtu ("combined discount rate"). This combined
         discount rate is based on 100% load factor and includes all applicable
         surcharges, if any. Northern reserves the right to allocate the
         combined discount rate between commodity and demand components
         exclusive of surcharges, such that the combined discount rate shall
         always equal $0.04 per MMBTU based on 100% load factor utilization.
         Continental agrees to pay Northern the rate stated herein on the
         contractual MDQ, irrespective of the amount of gas actually flowed by
         Continental on a daily basis.

2.       Term. The term of the above stated combined discount rate shall be
         three hundred sixty-four (364) days from the date initial deliveries
         are made under CR#101124. At the expiration of such period the rates
         applicable to service provided under CR#101124 shall become Northern's
         applicable tariff rates, as amended from time to time.

3.       Fuel. In addition to the above stated combined discount rate,
         Continental shall pay Northern the applicable fuel rate set forth in
         Northern's FERC Gas Tariff, as amended from time to time.

4.       FERC. If it is determined, as a result of any decision or regulation
         issued by the FERC or other administrative agency or court of
         competent jurisdiction: (i) that any discount provided to Continental
         by Northern would, in effect, require Northern to provide similar
         discounts to other shippers or that the providing of such discounted
         rates to Continental provides





                  Part of the Enron Group of Energy Companies
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Continental Natural Gas, Inc.                                             Page 2
Mr. Scott Longmore                                             February 16, 1996

         Continental an undue preference or would subject other shippers to
         undue discrimination; or (ii) that Northern is required to allocate
         costs to the service provided hereunder or recognize revenue as if it
         were charging rates in excess of the combined discount rate provided
         for herein; Northern and Continental agree to renegotiate the rate
         stated herein such that both parties achieve the same economic value
         as contemplated in this transaction.

5.       Maximum and Minimum. In no event shall the rate agreed to herein
         exceed the maximum rate or be less than the minimum rate authorized
         under Northern's FERC Gas Tariff, as amended from time to time. In the
         event the rate agreed to herein is or becomes greater than the maximum
         or less than the minimum permitted under Northern's FERC Gas Tariff,
         as revised from time to time, then Continental agrees to immediately
         decrease the rate herein down to the maximum or increase the rate(s)
         herein up to the minimum.

6.       Confidential. Each Party agrees that it will maintain this Agreement,
         all of its contents and subsequent discount documentation and
         communications in strict confidence and that it will not cause or
         permit disclosure thereof to any third party without the express
         written consent of the other Party except to the extent necessary to
         comply with valid laws, regulations or orders of any court or agency
         having jurisdiction.

7.       Economic Value. In the event that Northern implements a rate design
         different from that existing as of the date hereof, or Northern's
         maximum tariff rate is reduced from that existing as of the date
         hereof, the rate stated herein shall be adjusted, consistent with the
         rate change, to achieve the same economic value to both Parties based
         on 100% load factor utilization.

8.       Alternate Points. If Continental utilizes alternate receipt or
         alternate delivery points, or seeks to amend the primary receipt
         and/or primary delivery points set forth in CR#101124, unless
         otherwise agreed the combined discount rate set forth herein will not
         apply and the maximum rates set forth in Northern's FERC Gas Tariff,
         as amended from time to time, will apply.

9.       Capacity Release. The Parties agree that the combined discount rate
         set forth herein is not applicable to capacity released under
         CR#101124. If Continental releases capacity under CR#101124, the
         maximum rate stated in Northern's FERC Gas Tariff shall apply to such
         released capacity.

If this represents your understanding of our Agreement, please acknowledge
acceptance of these terms in the space provided below.





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Continental Natural Gas, Inc.                                             Page 3
Mr. Scott Longmore                                             February 16, 1996

AGREED TO AND ACCEPTED                     AGREED TO AND ACCEPTED
                                           
This 16th day of Feb., 1996.               This 1st day of March, 1996.

CONTINENTAL NATURAL GAS INCORPORATED       NORTHERN NATURAL GAS COMPANY



By: /s/                                    By: /s/ 
   ---------------------------                ----------------------------

Title: /s/                                 Title: /s/ 
      ------------------------                   -------------------------

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                                   EXHIBIT 2

                       Firm Throughput Service Agreement
                               Rate Schedule TFX

Shipper's Name and Address for Notices and Invoices:      Date: January 26, 1996
Continental Natural Gas Incorporated
Boston Bldg.  
1412 S. Boston 
Tulsa, OK 74119 
Attn: Gas Control


Address for Invoice
Continental Natural Gas Incorporated
Boston Bldg.
1412 S. Boston
Tulsa, OK 74119
Attn: Accounts Payable

Contract No: 101124

Term:    This Agreement shall become effective on March 1, 1996, or upon
         completion of construction of facilities at CNG A-line (S18, T13S,
         R26E, Beaver County, OK), whichever is later, for a term of 364 days.

Rates shall be Northern's maximum rates and charges plus all applicable
surcharges in effect from time to time under the applicable Rate Schedule on
file with the Commission unless otherwise agreed to by the parties in writing.

This transportation shall be provided pursuant to Subpart G of Part 284 of the
Federal Energy Regulatory Commission's ("Commission") regulations.

The contract maximum daily quantities and primary receipt and delivery points
are set forth on Appendix A, and if necessary, Appendix B.

If made available by Shipper, Northern agrees to receive and deliver thermally
equivalent volumes of natural gas as set forth in this Agreement.

Other:
      --------------------------------------------

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 other mutually agreeable means of
electronic transmission, to Shipper when sent to the address set forth on this
Agreement and to Northern when sent to the following:
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All Notices/Accounting Matters:          Payments:  Northern Natural Gas Company
     Northern Natural Gas Company                   Citibank N.A.  
     P.O. Box 1188                                  399 Park Avenue 
     Houston, Texas 77251-1188                      Account No. 4049-8026 
     Attn: Market Services                          New York, New York 10043

This Agreement shall incorporate and in all respects shall be subject to the
"General Terms and Conditions" and the applicable Rate Schedule(s) set forth in
Northern's FERC Gas Tariff, and may be revised from time to time. Northern may
file and seek Commission approval under Section 4 of the Natural Gas Act (NGA)
at any time and from time to time change any rates, charges or other provisions
set forth in the applicable Rate Schedule(s) and the "GENERAL TERMS AND
CONDITIONS" in Northern's FERC Gas Tariff, and Northern shall have the right to
place such changes in effect in accordance with the NGA, and this Throughput
Service Agreement shall be deemed to include such changes and any changes which
become effective by operation of law and Commission Order, without prejudice to
Shipper's right to protest the same.

Northern Natural Gas Company             Continental Natural Gas Incorporated

By: /s/                                  By: /s/ 
   ---------------------------              --------------------------------
Title: /s/                               Title: /s/ 
      ------------------------                 -----------------------------
Date: /s/                                Date: /s/ 
     -------------------------                ------------------------------





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