Document:

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                                                                EXHIBIT 10.11(c)

                                                          Contract No. 33182000A

                      Firm Transportation Service Agreement
                               Rate Schedule TF-1

                                     between

                         COLORADO INTERSTATE GAS COMPANY

                                       and

                              GREELEY GAS COMPANY,
                     A DIVISION OF ATMOS ENERGY CORPORATION

                             Dated: OCTOBER 1, 2000

<PAGE>   2

                      FIRM TRANSPORTATION SERVICE AGREEMENT
                               RATE SCHEDULE TF-1
--------------------------------------------------------------------------------

     The Parties identified below, in consideration of their mutual promises,
agree as follows:

1.   TRANSPORTER: COLORADO INTERSTATE GAS COMPANY

2.   SHIPPER: GREELEY GAS COMPANY, A DIVISION OF ATMOS ENERGY CORPORATION

3.   APPLICABLE TARIFF: Transporter's FERC Gas Tariff, First Revised Volume
     No. 1, as the same may be amended or superseded from time to time
     ("the Tariff").

4.   CHANGES IN RATES AND TERMS: Transporter shall have the right to propose to
     the FERC changes in its rates and terms of service, and this Agreement
     shall be deemed to include any changes which are made effective pursuant to
     FERC Order or regulation or provisions of law, without prejudice to
     Shipper's right to protest the same.

5.   TRANSPORTATION SERVICE: Transportation Service at and between Primary
     Point(s) of Receipt and Primary Point(s) of Delivery shall be on a firm
     basis. Receipt and Delivery of quantities at Secondary Point(s) of Receipt
     and/or Secondary Point(s) of Delivery shall be in accordance with the
     Tariff.

6.   POINTS OF RECEIPT AND DELIVERY: Shipper agrees to Tender gas for
     Transportation Service, and Transporter agrees to accept Receipt Quantities
     at the Primary Point(s) of Receipt identified in Exhibit "A." Transporter
     agrees to provide Transportation Service and Deliver gas to Shipper (or for
     Shipper's account) at the Primary Point(s) of Delivery identified in
     Exhibit "A."

7.   RATES AND SURCHARGES: As set forth in Exhibit "B."

8.   NEGOTIATED RATE AGREEMENT: N/A

9.   PEAK MONTH MDQ: 6,121 Dth per Day.

10.  TERM OF AGREEMENT: Beginning: October 1, 2000
                        Extending through: September 30, 2001

11.  NOTICES, STATEMENTS, AND BILLS:

         TO SHIPPER:
              INVOICES FOR TRANSPORTATION:
                  Greeley Gas Company, a division of Atmos Energy Corporation
                  P.O. Box 650205
                  Dallas, Texas 75265-0205
                  Attention: Gas Supply Department

              ALL NOTICES:
                  Greeley Gas Company, a division of Atmos Energy Corporation
                  P.O. Box 650205
                  Dallas, Texas 75265-0205
                  Attention: John Hack

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         TO TRANSPORTER:
              See Payments, Notices, Nominations, and Points of Contact sheets
              in the Tariff.

12.  SUPERSEDES AND CANCELS PRIOR AGREEMENT: When this Agreement becomes
     effective, it shall supersede and cancel the following agreement between
     the Parties: The Firm Transportation Service Agreement between Transporter
     and Shipper dated October 1, 2000, referred to as Transporter's Agreement
     No. 33182000.

13.  ADJUSTMENT TO RATE SCHEDULE TF-1 AND/OR GENERAL TERMS AND CONDITIONS: N/A

14.  INCORPORATION BY REFERENCE: This Agreement in all respects shall be subject
     to the provisions of Rate Schedule TF-1 and to the applicable provisions of
     the General Terms and Conditions of the Tariff, including, but not limited
     to, the right of first refusal described in ARTICLE 3 (and Transporter
     agrees that Shipper shall be entitled to exercise such right of first
     refusal), as filed with, and made effective by, the FERC as same may change
     from time to time (and as they may be amended pursuant to Section 13 of the
     Agreement).

     IN WITNESS WHEREOF, the parties hereto have executed this Agreement.

TRANSPORTER:                           SHIPPER:

COLORADO INTERSTATE GAS COMPANY        GREELEY GAS COMPANY, A DIVISION OF
                                       ATMOS ENERGY CORPORATION

By /s/ THOMAS L. PRICE                 By /s/ GORDON J. ROY
   --------------------------------       ---------------------------------
         Thomas L. Price
         Vice President
                                                   Gordon J. Roy
                                          ---------------------------------
                                                (Print or type name)

                                                   Vice President
                                          ---------------------------------
                                                (Print or type title)

                                       2<PAGE>   1

                                                                EXHIBIT 10.11(d)
                                                          Contract No. 31028000B

                              No-Notice Storage and
                    Transportation Delivery Service Agreement
                               Rate Schedule NNT-1

                                     between

                         COLORADO INTERSTATE GAS COMPANY

                                       and

                              GREELEY GAS COMPANY,
                     A DIVISION OF ATMOS ENERGY CORPORATION

                              Dated: APRIL 1, 2000

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         NO-NOTICE STORAGE AND TRANSPORTATION DELIVERY SERVICE AGREEMENT
                               RATE SCHEDULE NNT-1
--------------------------------------------------------------------------------

     The Parties identified below, in consideration of their mutual promises,
agree as follows:

1.    TRANSPORTER: COLORADO INTERSTATE GAS COMPANY

2.    SHIPPER: GREELEY GAS COMPANY, A DIVISION OF ATMOS ENERGY CORPORATION

3.    APPLICABLE TARIFF: Transporter's FERC Gas Tariff, First Revised Volume
      No. 1, as the same may be amended or superseded from time to time ("the
      Tariff").

4.    CHANGES IN RATES AND TERMS: Transporter shall have the right to propose to
      the FERC changes in its rates and terms of service, and this Agreement
      shall be deemed to include any changes which are made effective pursuant
      to FERC Order or regulation or provisions of law, without prejudice to
      Shipper's right to protest the same.

5.    TRANSPORTATION SERVICE: Transportation Service at and between Point of
      Withdrawal and Primary Point(s) of Delivery shall be on a firm basis.
      Delivery of quantities at Secondary Point(s) shall be in accordance with
      the Tariff.

6.    DELIVERY: Transporter agrees to transport and deliver Delivery Quantities
      to Shipper (or for Shipper's account) at the Point(s) of Delivery
      identified in Exhibit "A."

7.    RATES AND SURCHARGES: As set forth in Exhibit "B." For example,
      Transporter and Shipper may agree that a specified discount rate will
      apply: (a) only to certain specified firm service entitlements under this
      Agreement; (b) only if specified quantity levels are actually achieved
      under this Agreement (with higher rates, charges, and fees applicable to
      all quantities above those levels, or to all quantities under the
      Agreement if the specified levels are not achieved); (c) only to
      production reserves committed by the Shipper; (d) only during specified
      time periods; (e) only to specified Point(s) of Receipt, Point(s) of
      Delivery, mainline area segments, supply areas, transportation routes, or
      defined geographical areas; or (f) in a specified relationship to the
      quantities actually Delivered (i.e., that the rates shall be adjusted in a
      specified relationship to quantities actually Delivered); provided,
      however, that any such discounted rates set forth above shall be between
      the minimum and maximum rates applicable to the service provided under
      this Agreement.

8.    PEAK MONTH MDQ:  11,292 Dth per Day
      MAXIMUM AVAILABLE CAPACITY ("MAC"):  422,142 Dth
      MAXIMUM DAILY INJECTION QUANTITY ("MDIQ"):  2,814 Dth per Day
      MAXIMUM DAILY WITHDRAWAL QUANTITY ("MDWQ"):  11,292 Dth per Day

      All storage entitlements as stated herein (MAC, MDIQ, and MDWQ) are based
      on an Average Thermal Content of Gas in Storage of 1,000 Btu per cubic
      foot. The Available Daily Withdrawal Quantity ("ADWQ") and storage
      entitlements shall be subject to the General Terms and Conditions of the
      Tariff and stated on CIG's Xpress(R) system.

      REDUCTION OF MDQ. Effective May 1, 2002, and May 1 of any year thereafter
      through the term of this Agreement and subject to six months' prior
      written notice, Shipper shall have the right to reduce the MDQ under this
      Agreement subject to, and in accordance with, the following conditions and
      limitations:

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      (a)   The applicable regulatory or legislative body issues a final and
            nonappealable order allowing Shipper to permanently unbundle its
            merchant and transportation functions;

      (b)   The following calculation shall be used to determine the amount of
            MDQ, if any, no longer needed by Shipper to provide service to the
            markets served by this Agreement resulting from sales volume losses
            due to unbundling ("Excess MDQ"):

                            EXCESS MDQ = (A X B) - C
            where:

            AS =  The Shipper system served by Transporter under this Agreement,
                  which is affected by unbundling.

            A =   The average peak day usage factor on the AS (in Dth per
                  customer).

            B =   Sales customer losses by Shipper on the AS due to unbundling,
                  excluding former Shipper sales customers being served by a
                  Shipper affiliate.

            C =   Any incremental transportation, gathering, and storage volumes
                  contracted for by Shipper for the AS after the execution of
                  this Agreement.

            The resulting value may not be negative and shall be rounded down to
            a whole number. However, should shipper demonstrate the loss of an
            individual sales customer whose estimated peak day demand exceeds 10
            Dth, excluding former Shipper sales customers being served by a
            Shipper affiliate, then that volume shall be added to the Excess
            MDQ, provided that the total Excess MDQ from such individual
            customers is less than 1,000 Dth.

      (c)   Despite Shipper's use of its best efforts to acquire state approvals
            for cost recovery to avoid incurring "stranded costs" (including
            amounts due Transporter under this Agreement related to Excess MDQ),
            the applicable regulatory or legislative body does not approve a
            mechanism which provides Shipper the opportunity to recover from its
            rate payers such stranded costs.

      (d)   Despite Shipper's use of its best efforts to assign and/or release
            the Excess MDQ to recover the costs (if any) which Shipper was not
            afforded an opportunity to recover from its ratepayers under an
            approved mechanism, Shipper is unable to either so assign and/or
            release the Excess MDQ; and

      (e)   Shipper has exercised all rights it has to reduce contract
            entitlements under all firm transportation, gathering, and storage
            agreements with parties other than Transporter under which
            agreements gas is provided to the AS; then

      (f)   If the conditions set forth above have been satisfied, Shipper shall
            have the right to reduce the MDQ by an amount up to the Excess MDQ
            for the period from the effective date of Shipper's notice through a
            date designated by Shipper (not to exceed the date of termination of
            this Agreement). Provided, however, Transporter shall have the
            option, by notice delivered to Shipper within 45 days' of
            Transporter's receipt of Shipper's notice, to designate an
            equivalent volume of the firm contract capacity under Transporter
            firm transportation and/or storage agreement(s) serving the AS other
            than this Agreement for reduction in lieu of a reduction of the MDQ
            under this Agreement.

9.   TERM OF AGREEMENT:      Beginning: APRIL 1, 2000
                             Extending through: APRIL 30, 2005

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10.   NOTICES, STATEMENTS, AND BILLS:

         TO SHIPPER:
             INVOICES FOR TRANSPORTATION:
                Greeley Gas Company, a division of Atmos Energy Corporation
                P.O. Box 650205
                Dallas, Texas   75265-0205
                Attention: John Hack

             ALL NOTICES:
                Greeley Gas Company, a division of Atmos Energy Corporation
                P.O. Box 650205
                Dallas, Texas   75265-0205
                Attention: John Hack

         TO TRANSPORTER:
              See Payments, Notices, Nominations, and Points of Contact sheets
              in the Tariff.

11.   SUPERSEDES AND CANCELS PRIOR AGREEMENT: When this Agreement becomes
      effective, it shall supersede and cancel the following agreement between
      the Parties: The No-Notice Storage and Transportation Delivery Service
      Agreement between Transporter and Shipper dated October 1, 1996, and
      referred to as Transporter's Agreement No. 31028000A.

12.   ADJUSTMENT TO RATE SCHEDULE NNT-1 AND/OR GENERAL TERMS AND CONDITIONS: N/A

13.   INCORPORATION BY REFERENCE: This Agreement in all respects shall be
      subject to the provisions of Rate Schedule NNT-1 and to the applicable
      provisions of the General Terms and Conditions of the Tariff as filed
      with, and made effective by, the FERC as same may change from time to time
      (and as they may be amended pursuant to Section 12 of the Agreement).

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement.

TRANSPORTER:                              SHIPPER:

COLORADO INTERSTATE GAS COMPANY           GREELEY GAS COMPANY,
                                          A DIVISION OF ATMOS ENERGY CORPORATION

By: /s/ THOMAS L. PRICE                   By: /s/ GORDON J. ROY
   ----------------------------              -----------------------------------
       Thomas L. Price
       Vice President
                                                       Gordon J. Roy
                                             -----------------------------------
                                                    (Print or type name)

                                                       Vice President
                                             -----------------------------------
                                                    (Print or type title)

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