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                                                                 EXHIBIT 10.21


ENRON TRANSPORTATION & STORAGE

 . . .Services Provided by Northern Natural Gas Company and Transwestern
Pipeline Company


November 13, 1996


Continental Natural Gas Incorporated
FTS-1 Agreement No. 24690
Attn: Bob Malackowski

Continental Natural Gas Incorporated ("Shipper") and Transwestern Pipeline
Company ("Transwestern") (collectively referred herein as "Parties" or
individually as "Party") are Parties to the above-referenced contract. The
Parties desire to amend Contract #24690 as provided herein and do hereby agree
to the following:

1.       Shipper may utilize overrun volumes on the path of primary receipt
point Panhandle Pool (POI# 58647) to the primary delivery point of TW-CNG
Beaver (POI# 60213) at an overrun rate of $0.0700/MMBtu for a term of November
11, 1996 through November 30, 1996.

2.       Each party agrees that it will maintain this amendment, 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. However, in the event a party becomes aware of a
judicial or administrative proceeding or request that has resulted or that may
result in such disclosure, it shall so notify the other party immediately and
will also take all actions necessary to maintain confidentiality of all
discount communications and documents.

         This amendment shall be effective November 11, 1996. No other terms or
conditions of the Agreement are effected hereby. Except as amended herein, the
Agreement shall remain in full force and effect.

         This Amendment shall be binding and inure to the benefits of the
Parties hereto and their respective successors and assignments.

ACCEPTED AND AGREED TO                     ACCEPTED AND AGREED TO

This 12th day of December, 1996.           This ____ day of ____________, 1996.

CONTINENTAL NATURAL GAS INCORPORATED       TRANSWESTERN PIPELINE COMPANY


By: /s/                                    By:
   -------------------------------            -------------------------------
         Scott C. Longmore

Title: Vice President of Marketing         Title:
                                                 ----------------------------




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ENRON TRANSPORTATION & STORAGE

 . . .Services Provided by Northern Natural Gas Company and Transwestern
Pipeline Company

March 15, 1996

Continental Natural Gas, Inc.
Attn: Scott C. Longmore

Pursuant to negotiations, Transwestern Pipeline Company ("Transwestern") and
Continental Natural Gas, Inc. ("Shipper") agree as follows regarding the
provisions of firm transportation services:

1.       Shipper and Transwestern have entered into a Firm Transportation
Service Agreement ("FTS-1") (Contract # 24690). The firm maximum daily
transportation quantity (MAXDTQ) is:

15,000 MMBtu per day

The term of the discounted rate provided hereunder shall be from the later of
April 1, 1996 or the in-service date of Transwestern owned custody transfer
measurement at the Primary Receipt Points through March 31, 2001.

2.       The discounted rate for the FTS-1 agreement is as follows:

                        $ .0607  - Reservation Rate /MMBtu/day
                        $ .0093  - Commodity Rate/MMBtu
                        $ .0700  - Total Rate/MMBtu/day

In addition to the above stated rates, Shipper shall also pay discounted fuel,
at a rate of 1%, pursuant to Transwestern's FERC Gas Tariff. The transportation
rates, set forth above, shall in no event be greater than the maximum or lower
that the minimum rates provided in Transwestern's FERC Gas Tariff, as amended
from time to time.

3.       Shipper agrees that if it utilizes alternate receipt or delivery
points, other than alternate receipt points located on the northeast side of
Transwestern's Compressor Station P-3, the discounted rate set forth herein
will not be applicable and Transwestern's maximum rates will apply.

4.       Shipper agrees that if it utilizes Transwestern's capacity release
program to release, on either a temporary or permanent basis, any capacity
subject to this discount, the discount associated with said capacity shall be
terminated and the applicable maximum rates shall apply.

5.       Each party agrees that it will maintain this amendment, 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. However, in the event a party becomes aware of a
judicial or administrative proceeding or request that has resulted or that may
result in such disclosure, it shall so notify the other party





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immediately and will also take all actions necessary to maintain
confidentiality of all discount communications and documents.

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

TRANSWESTERN PIPELINE COMPANY


 /s/ 
- --------------------------------
Bob Burleson
Enron Transport & Storage

Agreed to and accepted this 15th day of March, 1996.

By: /s/ 
   -----------------------------
   CONTINENTAL NATURAL GAS, INC.




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ENRON TRANSPORTATION & STORAGE

 . . .Services Provided by Northern Natural Gas Company and Transwestern
Pipeline Company


March 14, 1996



Continental Natural Gas, Inc.
Attn: Scott C. Longmore

Pursuant to negotiations, Transwestern Pipeline Company ("Transwestern") and
Continental Natural Gas, Inc. ("Shipper") agree as follows regarding the
provisions of firm transportation services:

1.   Shipper and Transwestern have entered into a Firm Transportation Service
Agreement ("FTS-1") (Contract # 24690).  The firm maximum daily transportation
quantity (MAXDTQ) is:

15,000 MMBtu per day

The term of the discounted rate provided hereunder shall be from the later of
April 1, 1996 or the in-service date of Transwestern owned custody transfer
measurement at the Primary Receipt Points through March 31, 2001.

2.   The discounted rate for the FTS-1 agreement is as follows:

                        $ .0607  - Reservation Rate /MMBtu/day
                        $ .0093  - Commodity Rate/MMBtu
                        $ .0700  - Total Rate/MMBtu/day

In addition to the above stated rates, Shipper shall also pay discounted fuel,
at a rate of 1%, pursuant to Transwestern's FERC Gas Tariff. The transportation
rates, set forth above, shall in no event be greater than the maximum or lower
that the minimum rates provided in Transwestern's FERC Gas Tariff, as amended
from time to time.

3.       Shipper agrees that if it utilizes alternate receipt or delivery
points, other than alternate receipt points in the Panhandle Zone, the
discounted rate set forth herein will not be applicable and Transwestern's
maximum rates will apply.

4.       Shipper agrees that if it utilizes Transwestern's capacity release
program to release, on either a temporary or permanent basis, any capacity
subject to this discount, the discount associated with said capacity shall be
terminated and the applicable maximum rates shall apply.

5.       Each party agrees that it will maintain this amendment, 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





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the extent necessary to comply with valid laws, regulations or orders of any
court or agency having jurisdiction.  However, in the event a party becomes
aware of a judicial or administrative proceeding or request that has resulted
or that may result in such disclosure, it shall so notify the other party
immediately and will also take all actions necessary to maintain
confidentiality of all discount communications and documents.

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

TRANSWESTERN PIPELINE COMPANY


 /s/ 
- --------------------------------
Bob Burleson
Enron Transport & Storage

Agreed to and accepted this 14th day of March, 1996.

By: /s/ 
   -----------------------------
   CONTINENTAL NATURAL GAS, INC.





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                   TRANSPORTATION SERVICE AGREEMENT - FORM M
                              Terms and Conditions


Section 1 - Transportation Quantity

     1.1         Subject to the terms, conditions and limitations hereof and of
                 Transporter's Rate Schedule FTS-1, Transporter agrees to
                 receive and transport, on a firm basis, to or for the account
                 of Shipper, quantities of gas up to the MAXDTQ set forth on
                 the face of this Agreement and to deliver thermally equivalent
                 volumes less the percentage of gas used by Transporter in
                 providing the transportation service as specified in
                 Transporter's Rate Schedule FTS-1.

     1.2         Transporter agrees to transport natural gas for Shipper in
                 excess of the MAXDTQ on an interruptible basis provided that
                 Transporter has determined that it has sufficient capacity to
                 transport such excess volumes.

Section 2 - Receipt and Delivery

     2.1         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
                 Transporter's facilities not to exceed the maximum allowable
                 operating pressure; provided, however, Transporter shall have
                 no obligation to provide compression and/or alter its system
                 operation to enable Shipper to effectuate said deliveries.

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

     2.3         Both Transporter and Shipper recognize that due to variations
                 in operating conditions, daily and monthly deliveries
                 hereunder by Transporter may be greater or less than the
                 corresponding receipts less gas used by Transporter for
                 transportation hereunder. Shipper and Transporter agree that
                 any excess or deficiency in such receipts, less gas used, and
                 deliveries shall be adjusted or corrected in gas as soon as
                 operating conditions reasonably permit.

Section 3 - Termination

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





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     3.2         Termination of this Agreement shall not relieve Transporter
                 and Shipper of the obligation to correct any volume imbalances
                 hereunder, or Shipper to pay money due hereunder to
                 Transporter. Accordingly, Section 2.3 of this Agreement shall
                 survive termination until all imbalances have been eliminated
                 and all amounts due hereunder have been paid.

Section 4 - General

     4.1         This Agreement in all respects shall be subject to the
                 provisions of Rate Schedule FTS-1 as well as the General Terms
                 and Conditions, if applicable, contained in Transporter's FERC
                 Gas Tariff Second Revised Volume No. 1, as may be revised from
                 time to time.

     4.2         Transporter shall have the unilateral 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 FTS-1 or the general terms and
                 conditions of its FERC Gas Tariff from time to time and to
                 place such changes in effect in accordance with Section 4(c)
                 of the NGA and this Transportation Service Agreement shall be
                 deemed to include such changes 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.

     4.3         Transporter's Rate Schedule FTS-1 is hereby incorporated by
                 reference and made a part hereof.

Section 5 - Notices

     5.1         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, to Shipper when sent to the address set
                 forth on the face of this Agreement and to Transporter when
                 sent to the following:

                 All Notices:     Transwestern Pipeline Company
                                  Attn: Transportation Administration
                                  Department P.O. Box 1188 Houston, Texas
                                  77251-1188

                 Payments:        Transwestern Pipeline Company
                                  Attn: Gas Accounting
                                  P.O. Box 1188
                                  Houston, Texas 77251-1188




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