Document:

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                                                                   EXHIBIT 10.13

                        TRANSPORTATION SERVICE AGREEMENT

                                (FIRM INTRASTATE)

          THIS FIRM INTRASTATE TRANSPORTATION SERVICE AGREEMENT (hereinafter
referred to as "Service Agreement") made and entered into as of this 1st day of
January, 2002, by and between ONEOK WesTex Transmission, L.P., hereinafter
referred to as "Company" and ENERGAS Company, a division of Atmos Energy
Corporation, hereinafter referred to as "Customer."

          WHEREAS, Customer desires to establish a master Firm Intrastate
Transportation Service Agreement whereby Gas may be transported by Company on a
firm basis on behalf of Customer if Company and Customer mutually agree to the
terms and conditions of such transportation; and

          WHEREAS, Company desires to transport such Gas for Customer if such
terms and conditions can be agreed to.

          NOW, THEREFORE, in consideration of the mutual covenants and
conditions contained herein, Company and Customer hereby agree as follows:

                                   ARTICLE I.

                               GENERAL PROVISIONS

          1.1 The provisions of this Agreement as well as the General Terms and
Conditions herein, in the General and Exhibit A, attached hereto and by this
reference included herein as if set forth in full, are intended to be
incorporated into and become part of the Service Agreement between Customer and
Company relating to the transportation of Gas by Company. The Service Agreement
will consist of the provisions contained Terms and Conditions, in the Service
Orders A-1, A-2, A-3 and A-4 attached hereto and in

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any new Gas transportation order ("Service Order") which sets forth the specific
terms and conditions of such transportation.

         1.2 The Service Orders A-1, A-2, A-3 and A-4 attached hereto are
incorporated herein by this reference and are jointly referred to as Service
Orders. Should Company and Customer from time to time after the Effective Date
come to a new understanding regarding the transportation of Gas for a particular
period of delivery, then Company shall communicate that understanding to
Customer by sending a completed new Service Order (a form which is attached
hereto as Exhibit A) to Customer. Upon acceptance of the Service Order by
Customer which must be provided and agreed to by Company prior to any delivery
of gas, the Service Order shall be effective as to both parties.

         1.3 All nominations, scheduling, transportation and priorities for
service shall be subject to the actions of the Point Operator at the applicable
Point(s) of Receipt or Point(s) of Delivery.

         1.4 The definitions applicable to transportation of gas are set forth
in the General Terms and Conditions attached hereto and by this reference
included herein.

                                   ARTICLE II.

                                 TRANSPORTATION

         2.1 Company hereby agrees to transport on behalf of Customer, up to,
but not in excess of, that amount shown on the applicable Service Orders and
each new Service Order effective between the Parties for each of the Point(s) of
Delivery. Company shall have no obligation to deliver such Gas unless such Gas
is being or has been received by Company at the Point(s) of Receipt as
identified on the applicable Service Orders and each new Service Order effective
between the Parties and in accordance with the General Terms and Conditions. To
the extent that Gas is not physically being transported for or on behalf of
Customer, Customer shall have no right, title or interest in the System, its
capacity or

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any rights therein. Notwithstanding the above, Customer shall have the right at
all times, subject to the terms and conditions of this Agreement, to utilize the
capacity up to the Demand Quantity as set forth in the applicable Service Order.
Daily and Monthly thermal balancing of receipts and deliveries shall be
maintained by Customer to the maximum extent practicable.

          2.2 As payment for transportation of Gas hereunder Customer shall pay
the Company an amount equal to the charges set forth in this Service Agreement,
the Service Orders, each new Service Order effective between the Parties, and
the fees and charges described in the General Terms and Conditions. The parties
recognize and agree that there may be multiple Service Orders in existence at
any one time. From the gas delivered to Company by or for the account of
Customer, Company shall retain for its own account and without compensation to
Customer an amount of Gas equal to the Fuel and Use Quantity.

          2.3 "Metering Facility(ies)" means the equipment and facilities
located in the West Texas area (including but not limited to all pipe, valves,
fittings, meters and regulators) which are presently connected (or connected in
the future under Section 2.5 hereof) directly to Company's pipeline system(s) as
follows:

          (a)   OrificeMeters;

          (b)   Large Capacity Positive Displacement Meters ("Large Meters"),
                being Class IV or larger positive displacement, turbine, and
                rotary meters which includes those meters with a capacity equal
                to or greater than 1800 cubic feet per hour at 8 ounces of
                pressure and 2" differential pressure;

          (c)   Other Positive Displacement Meters ("Other Meters"), being those
                Class I through III meters which includes those meters with a
                capacity less than 1800 cubic feet per hour at 8 ounces of
                pressure and 2" differential pressure.

          (d)   New Facilities as described in Section 2.5(a) hereof.

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Company shall own all Orifice Meters and Large Meters unless otherwise agreed by
the parties. Customer shall own, maintain, and operate all Other Meters
Additionally, all yard lines and service lines downstream of the Metering
Facility(ies) shall remain the property of Customer. Company shall own, operate
and maintain all taps, valves and regulators upstream of the Metering
Facilities, except that Customer shall own, operate and maintain its own
regulators upstream of Other Meters.

         2.4 Unless otherwise mutually agreed upon in writing, Company will be
the "Operating Party" for all Orifice Meters and Large Meters and Customer will
be the "Operating Party" for Other Meters. Any Orifice Meters and Large Meters
which are replaced with an Other Meters after the Effective Date, Customer shall
be the Operating Party at its sole cost and expense.

         2.5 (a) In the event Customer determines that a new Orifice Meter or
Large Meter ("New Facility") is required to provide service to Customer under
this Service Agreement, Customer shall submit a request to Company and Company
shall install, own, and operate, or cause to be installed and operated such New
Facility. Company shall have no obligation to provide transportation capacity or
any other rights to Customer in excess of that which were allowed by contract to
Customer prior to the installation of the New Facilities. Customer shall pay to
Company or Company's designee the actual cost of such installations (including
taxes on income, if any, for aid in construction reimbursements) plus an
overhead charge of fifteen percent of such actual cost. Customer shall pay such
costs within thirty (30) days of receipt of invoice. Customer at its cost, shall
provide location sites acceptable to Company for all such New Facilities.
Company shall designate the type of New Facilities that shall be utilized;
provided, if Company, after the installation of New Facilities pursuant to
Company's initial designation for any point hereunder, designates a different
type of New Facilities, the cost of such

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different New Facilities shall be borne by Company. Company will install or
cause to be installed a New Facility only upon receipt of a completed "New
Facilities Request" form from Customer (example provided in attached Exhibit B).

         (b)   Customer shall not be responsible for costs associated with the
               replacement, rebuilding or repair of any Orifice Meters, Large
               Meters or New Facilities.

         (c)   For all Other Meters, unless otherwise agreed, Customer at its
               sole cost and expense shall install, own and operate or cause to
               be installed and operated all equipment determined by Customer to
               be necessary for the measurement of gas to be delivered under
               this Service Agreement. Unless otherwise agreed, Company will not
               be responsible for costs associated with the replacement,
               rebuilding or repair of all Other Meters. Customer shall not
               install, remove or change in any manner any Other Meters without
               written notice to the Company at least (1) day in advance
               thereof. Company shall have no obligation to provide
               transportation capacity or other rights to Customer in excess of
               that allowed by contract to Customer prior to the installation,
               removal or change of any Other Meters. Notices to install, remove
               or change any Other Meter shall be in the format attached as
               Exhibit C hereto and shall be submitted to:

                                          ONEOK WesTex Transmission, L.P.
                                          Measurement Supervisor,
                                          P.O. Box 5810
                                          Lubbock, Texas 79408
                                          or
                                          4002 MLK, Jr. Blvd.
                                          Lubbock, Texas 79404
                                          Tel. (806) 747-3037 or (806) 762-0560
                                          Fax (806) 765-6716.

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          Emergency installations, removals and changes can be reported to the
phone numbers given above or can be made and then reported to the Company by
facsimile on the business day following such installation, removal or change. If
Customer fails to make such notices and reports as required, Company will charge
and Customer will pay a $50.00 late notice fee for each such failure.

(d)      All equipment installed by either Party will be in compliance with
         industry standard designs and operated in accordance with this Service
         Agreement. Either Party may install, maintain, and operate, at its sole
         cost and expense, check metering facilities or other related equipment
         including, but not limited to, separate metering facilities, and
         equipment which will give either party the right to share
         pressure/differential sensing lines and positive displacement meter
         pulse output; provided, however, that such equipment shall be installed
         in a manner that will not interfere with the operation of the other
         Party's metering facilities and/or telemetry equipment.

2.6      (a) Company shall cause all Orifice and Large Meters to be read once
         each Month on approximately the same day of the Month as close to the
         end of the month as reasonably practicable. Upon mutual agreement of
         the Parties, the reading of Large Meters may be delegated to Customer
         provided that such agreement provides at a minimum a list of Large
         Meters to be read, the time each Large Meter will be read each Month
         and the format and method in which Customer will communicate the
         monthly readings to Company.

(b)      Customer at its sole cost and expense shall cause all Other Meters to
         be read at least once each Month on approximately the same date each
         Month and report such information to Company in a format and within a
         time period specified by Company in its reasonable discretion.

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         2.7 Company shall make all reasonable efforts to maintain a minimum of
one hundred fifty (150) psig at the inlet to all Town Border Stations (TBS's)
(as defined in Section 1 (k) of Schedule A-l attached to Exhibit A-l attached to
this Service Agreement), all other deliveries shall be made at the pressure
existing from time to time in Company's facilities. Notwithstanding the one
hundred fifty (150) psig requirement at the TBS's, neither Party shall be
required to install compression facilities in order to effect deliveries
hereunder at the Metering Facilities.

         2.8 At any Metering Facilities in which Company serves Customer at a
delivery pressure above 5.3 ounces, Company agrees to adjust the delivery
pressure, as soon as reasonably practicable, to a pressure within the limits of
service at that location as defined by Department of Transportation regulations
40 C.F.R. Part 192.

         2.9 Company shall inject Mercaptan into the natural gas prior to
delivery to Customer from Metering Facilities directly connected to pipeline
systems which Company owns as of the Effective Date at the rate of approximately
one-half pound per MMcf. Company shall construct, maintain and operate any
facilities required for the performance of this obligation. Customer shall be
responsible for odorization of the natural gas received by Customer from
pipelines that are not owned by Company or if odorization is required by law,
regulation or industry practice in excess of one-half pound of Mercaptan per
MMcf Customer shall be responsible for monitoring and performing all odorant
checks within its delivery systems and will notify Company immediately if
Customer determines that Company is injecting less than one-half pound of
Mercaptan per MMcf prior to delivery to Customer. Customer shall also be
responsible for any regulatory requirements associated with monitoring and
performing odorant checks on its delivery systems. Notwithstanding any other
provisions in this Service Agreement, Customer shall defend, indemnify and hold
Company harmless from any and all liability, claim, loss, penalty, fines, damage
or expense (including attorneys fees) which may arise out of Customer's failure
or alleged failure to

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odorize gas Customer delivers to its customers.

          2.10 Unless mutually agreed to otherwise by Company and Customer, upon
issuance of an Operational Flow Order, Company shall advise Customer of the
volume of Gas that must be curtailed immediately pursuant to Section 4.8 of the
General Terms and Conditions. Within four (4) hours after receipt of such
notice, Customer shall advise Company of the Point(s) of Receipt and Point(s) of
Delivery that may be curtailed and the volume of Gas to be curtailed at each
such Point(s) of Receipt and Point(s) of Delivery. Company shall curtail
deliveries at such Point(s) of Receipt and Point(s) of Delivery within four (4)
hours of receipt of such notice from Customer. As long as such Operational Flow
Order is in effect Company and Customer shall implement further curtailments
that need to be made in the same manner and under the same time limitations.

          2.11 This Service Agreement shall be binding upon the parties upon its
execution by all parties hereto and will become effective on the date
hereinabove written (hereinafter referred to as Effective Date). The Service
Agreement shall extend for a term of one (1) year from and after such Effective
Date and month to month thereafter until terminated by either party upon thirty
(30) days written notice, but in no event shall this Service Agreement expire
(but shall be subject to termination as set forth in the General Terms and
Conditions) prior to the expiration of any applicable Service Order.
Upon expiration, all obligations of the parties hereto shall terminate, except
as to the reconciliation of accounts, adjustments for prior periods, balancing
of receipts and withdrawals of Gas hereunder and the payment of any amounts due.

          2.12 Any notice, request, statement, correspondence, or payment
provided for in this Service Agreement shall be given in writing, delivered in
person, by facsimile, by

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private carrier or by United States mail, to the parties hereto at the addresses
shown below or at such other addresses as may be hereafter furnished by one
party to the other in writing:

For General Notices:

COMPANY:                                CUSTOMER:
ONEOK WesTex Transmission, L.P.         ENERGAS Company,
                                        A division of Atmos Energy Corporation
Attention: Contract Administration      Attention: Contract Administration
P.O. Box 22089                          P. O. Box 650205
Tulsa, OK 74121-2089                    Dallas, Texas 75265-0205
Facsimile: (918) 588-7616               Phone: (972) 855-3280
                                        Facsimile: (972) 855-3070

For Operational Notices:

ONEOK WesTex Transmission, L.P.         ENERGAS Company,
Attention: Contract Administration      A division of Atmos Energy Corporation
P.O. Box 22089                          Attention: Gas Supply
Tulsa, OK 74121-2089                    P.O. Box 650205
Facsimile: (918) 588-7616               Dallas, Texas 75265-0205
                                        Phone: (972) 855-3749
                                        Facsimile: (972) 855-3070

(Intentionally Left Blank)                For Local Technical or Operational
                                          Assistance:

                                          Energas Company,
                                          A division of Atmos Energy Corporation
                                          Attention: Technical Services
                                          5110 80th Street
                                          Lubbock, Texas 79424
                                          Phone: (806) 798-4446
                                          Facsimile: (806) 798-4495

After Hours Emergency Notification:

ONEOK WesTex Gas Control                  Atmos Gas Control
Phone: 800-562-5879                       Phone: (615) 535-7700 ext. 223
Facsimile: 918-588-7533                   Facsimile: (615) 790-9337

For Payments:                             For Invoices:

Remit by Wire Transfer or ACH to:         ENERGAS Company,
ONEOK Westex Transmission L.P.            a division of Atmos Energy Corporation
Bank One, Oklahoma, NA, Tulsa, OK         Attention: Gas Supply
ABA #103000648                            P.O. Box 650205
Account #: 632944989                      Dallas, TX 75265-0205

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          2.13 Neither Customer nor its officers, directors, employees, agents
or representatives shall take, omit to take, or permit to be taken any action
which shall subject Company, its affiliates, their Systems or any of their other
facilities to the jurisdiction of the Federal Energy Regulatory Commission (or
any successor agency) pursuant to the Natural Gas Act of 1938, as amended, the
Natural Gas Policy Act of 1978, as amended, or any of the rules and regulations
adopted pursuant to those acts. If Customer breaches the foregoing provision,
then Customer agrees to defend (with counsel of Company's choosing to be made in
Company's sole discretion), indemnify and hold Company, its affiliates and their
officers, directors, employees, agents and representatives harmless from and
against any loss, damage, cost (including reasonable attorney's fees) and
expenses (including fines and penalties, consequential and exemplary damages)
arising out of any action, suit, proceeding, judgment, claim, allegation,
investigation and liability of any nature whatsoever relating to the foregoing
provision and the breach thereof. Further, Customer recognizes and agrees that
if Company determines that a violation of the first sentence of this Section
2.13 may have occurred, then Company may immediately take such action as it
deems necessary in its sole discretion to terminate such jurisdictional status.

          2.14 TO THE EXTENT THAT TEXAS LAW SHALL APPLY TO THE TRANSACTIONS
COVERED HEREBY, THE PARTIES CERTIFY THAT THEY ARE NOT "CONSUMERS" WITHIN THE
MEANING OF THE TEXAS DECEPTIVE TRADE PRACTICES CONSUMER PROTECTION ACT,
SUBCHAPTER E OF CHAPTER 17, SECTIONS 17.41, ET SEQ., OF THE TEXAS BUSINESS AND
COMMERCE CODE, AS AMENDED ("DTPA"). THE PARTIES COVENANT, FOR THEMSELVES AND FOR
AND ON BEHALF OF ANY SUCCESSOR OR ASSIGNEE, THAT, IF THE DTPA IS APPLICABLE TO
THIS AGREEMENT, (1) THE PARTIES ARE "BUSINESS CONSUMERS" AS THAT TERM IS DEFINED
IN THE DTPA AND (2) OTHER THAN SECTION 17.555 OF THE TEXAS BUSINESS AND COMMERCE
CODE, EACH PARTY HEREBY WAIVES AND RELEASES ALL OF ITS RIGHTS AND REMEDIES
THEREUNDER AS APPLICABLE TO THE OTHER PARTY AND ITS SUCCESSORS AND ASSIGNS.

          2.15 The Operating Agreement dated November 13, 1996, the LDC
Transport Agreement

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dated January 1, 1996 and LVS Transportation Agreement dated January 1,1996,
(all three agreements jointly referred to as Terminated Contracts) all by and
between the parties hereto or their predecessors in interest are hereby
terminated and cancelled effective as of the Effective Date except that each of
the Parties reserves all of their rights with respect to: (1) the balancing of
gas receipts and deliveries; (2) the payment for services previously rendered;
(3) any and all debts, demands, claims, counter-claims, cross claims, causes of
action, duties to defend, defenses, obligations, liabilities, rights, and
damages of any kind whatsoever, asserted or unasserted, at law or in equity,
whether known or unknown arising under or in connection with such Terminated
Agreements.

          2.16 The General Terms and Conditions are incorporated herein by this
reference and the words and phrases contained herein shall have the same
meanings as set forth in the General Terms and Conditions.

          IN WITNESS WHEREOF, this Service Agreement is executed this (22nd) day
of (August, 2002).

ENERGAS Company,                     ONEOK WesTex Transmission, L.P.
a division of                        by ONEOK WesTex Gas Pipeline, Inc.
Atmos Energy Corporation             General Partner

By: /s/ Gordon J. Roy                By: /s/ John L. Sommer
Vice President                       Vice President

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                                 ENERGAS COMPANY

                         ONEOK WESTEX TRANSMISSION, L.P.
                          GENERAL TERMS AND CONDITIONS

                                    ARTICLE 1
                                   DEFINITIONS

         1.1 "Affiliate" shall mean any person, entity, or business section, or
division that directly or through one or more intermediaries' controls, is
controlled by, or is under common control with the entity in question. Control
includes, the possession, directly or indirectly, and whether acting alone or in
conjunction with others, of the authority to direct a direction of the
management or policies of a person or entity. Control may be exercised through
management, ownership of voting securities or other right to vote, by contract
or otherwise. Affiliates of the Company shall not include Western Resources,
Inc.

         1.2 "Btu" shall mean British thermal unit. The definition of one Btu is
the quantity of heat that must be added to one pound (avoirdupois) of pure water
to raise its temperature from fifty eight and one-half degrees (58.5
degrees)Fahrenheit to fifty nine and one-half degrees (59.5 degrees)Fahrenheit
under standard pressure conditions. Btu shall be computed on a temperature base
of sixty degrees (60 degrees) Fahrenheit and a pressure base of fourteen and
seventy-three hundredths (14.73) psia and on a gross-real-dry basis and shall
not be corrected for real water vapor as obtained by means commonly acceptable
to the industry, and "MMBtu" shall mean one million (1,000,000) Btu.

         1.3 "Customer" shall mean the person or entity that has executed a
Service Agreement with the Company for the service rendered under such Service
Agreement or, as the context may require, any person or entity requesting
service hereunder.

         1.4 "Day" shall mean the consecutive 24-hour period commencing at 9:00
a.m. (Central Clock Time) on one calendar day and ending at 9:00 a.m. (Central
Clock Time) the following calendar day.

         1.5 "Dekatherm" or "Dth" shall mean one million Btu'

         1.6 "Effective Date" shall mean the date specified in the Service
Agreement.

         1.7 "Equivalent Quantity" shall mean those Dekatherms of natural Gas to
be made available during any period of time to or on behalf of the Customer at
one or more Point(s) of Delivery, which Dekatherms shall be the thermal
equivalent of the Input Quantity delivered to Company at the Point(s) of Receipt
by or on behalf of Customer during that period of time, less the applicable Fuel
and Use Quantity.

         1.8 "FERC" shall mean the Federal Energy Regulatory Commission or any
successor regulatory agency.

         1.9 "Finn Intrastate Transportation Service ("ETS") shall mean that
firm service which is available pursuant to an effective Gas Transportation
agreement.

         1.10 "Fuel and Use Factor" shall be the applicable percentage set forth
in the Service Order. as such may be revised from time to time by mutual
agreement.

         1.11 "Fuel and Use Quantity" shall be equal to the product of the
applicable Fuel and Use Factor and the Input Quantity.

         1.12 "Gas," "gas" or "natural gas" shall mean the effluent vapor stream
in its natural, gaseous state, including gas-well gas, casinghead gas, residue
gas resulting from processing both casinghead gas and gas-well gas, and all
other hydrocarbon and non-hydrocarbon components thereof

         1.13 "Hour" shall mean a one hour period commencing at the start of a
given hour within the Day and ending 60 minutes later within the Day.

         1.14 "Input Quantity" shall mean the quantity of Gas received at the
Point(s) of Receipt in Dekatherms of Gas which are actually received by the
Company at the Point(s) of Receipt by or on behalf of Customer.

<PAGE>

         1.15 "Intermptible Transportation Service ("ITS") shall mean that
intermptible service which is available to any Customer, subject to availability
of transportation capacity, as determined by Company, with an effective Gas
Transportation Agreement.

         1.16 "Interstate Points" shall mean interconnections between the System
and those of an interstate pipeline regulated as such hy the Federal Energy
Regulatory Commission pursuant to the Natural Gas Act, as amended.

         1.17 "Maximum Annual Delivery Quantity" shall mean the maximum amount
of Dekatherms of Gas that the System delivers to Customer in any Contract Year.

         1.18 "Maximum Annual Receipt Quantity" shall mean the maximum amount of
Dekatherms of Gas that the System receives from Customer for transportation in
any Contract Year.

         1.19 "Maximum Daily Delivery Quantity" shall mean the maximum amount of
Dekatherms of Gas that the System delivers to Customer in any one Day.

         1.20 "Maximum Daily Receipt Quantity" shall mean the maximum amount of
Dekatherms of Gas that the System receives from Customer in any one Day.

         1.21 "Maximum Hourly Delivery Quantity" shall mean the maximum amount
of Dekatherms of Gas that the System delivers to Customer in any one Hour.

         1.22 "Maximum Hourly Receipt Quantity" shall mean the maximum amount of
Dekatherms of Gas that the System receives from Customer in any one Hour.

         1.23 "Maximum Monthly Delivery Quantity" shall mean the maximum amount
of Dekatherms of Gas the System delivers to Customer in any Month.

         1.24 "Maximum Monthly Receipt Quantity" shall mean the maximum amount
of Dekatherms of Gas that the System receives from Customer for transportation
during any Month.

         1.25 "Mcf' shall mean one thousand (1,000) cubic feet of Gas.

         1.26 "Month" shall mean the period beginning at 9:00 a.m. Central clock
time on the first day of each calendar month and ending at 9:00 am. Central
clock time on the first day of the next succeeding calendar month.

         1.27 "Nomination" shall mean the request for services at a specified
time, date, quantity, rate and Rank Priority at the Point(s) of Receipt and
Delivery.

         1.28 "OFO Period" shall mean the period of time in which an OFO is in
effect.

         1.29 "Operational Flow Order ("OFO)" shall mean the issuance of notice
that physical flows at each Point of Receipt must balance the confirmed or
scheduled flows at each such Point of Receipt and the physical flows at each
Point of Delivery must balance the confirmed or scheduled flows at each such
Point of Delivery, via the telephone, ALTRA WEB, Nominations System, or
facsimile, which are intended to alleviate conditions which threaten the safe
operations or system integrity of the Company's Systems, or which are required
to maintain efficient and reliable service.

         1.30 "Party" or "party" shall mean Customer or Company and the term
"Parties" or "parties" shall mean Customer and Company.

         1.31 "Person" shall mean an individual, a corporation, voluntary
association, joint stock company, business trust, partnership or other entity.

         1.32 "Point(s) of Delivery" shall mean the point or points where Gas is
delivered from the System to or for the account of Customer and are shown on the
applicable Service Order. Each Point(s) of Delivery shall be treated separately
with respect to all rights and obligations and all actions to be taken pursuant
to the Service Agreement and the Exhibits attached thereto, including, without
limitation, where applicable, nominations, balancing, Gas quality, delivery
pressure and force majeure.

         1.33 "Point(s) of Receipt" shall mean the point or points where Company
shall receive Gas into the Systems from Customer, as described on the applicable
Service Order.
<PAGE>

         1.34 "Point Operator" shall mean the entity or entities that operate,
accept or provide Gas to the Point(s) of Receipt or Delivery.

         1.35 "Pro Rata Share" shall mean the ratio that the quantity of Gas
scheduled to be received or delivered, as appropriate, by the Company, from or
for the account of the Customer, bears to the total quantity of Gas scheduled to
be received or delivered, as appropriate, by the Company from or for the account
of all Customers for Service in the applicable System during any given time
period (day, month, year). Gas scheduled to be received shall be used at the
Point(s) of Receipt and Gas scheduled to be delivered shall be used at the
Point(s) of Delivery to determine the applicable Pro Rata Share.

         1.36 "Psia" shall mean pounds per square inch, absolute.

         1.37 "Psig" shall mean pounds per inch gauge.

         1.38 "Rank Priority" shall mean the priority in which quantities are to
be allocated at the Point(s) of Receipt and Point(s) of Delivery. With respect
to the Point(s) of Receipt, the priority shall be established by the person or
entity who operates the facilities delivering Gas to the Company. With respect
to the Point(s) of Delivery, the priority shall be established by the person or
entity operating the meter at such Point(s) of Delivery.

         1.39 "Service Agreement" shall mean the agreement to which the General
Terms and Conditions is attached.

         1.40 "Service Order" shall mean that supplemental agreement entered
into by the parties hereto from time to time which sets forth the specific data
relating to the transportation of Gas pursuant to the Agreement.

         1.41 "Shipper" shall mean any person for whom the transmission of
natural Gas is being performed.

         1.42 "Storage Agreement" shall mean that Storage Agreement dated
concurrently herewith between Customer and ONEOK Texas Gas Storage, L.P.

         1.43 "System or Systems" shall mean the various pipeline facilities and
related equipment located in the State of Texas owned by the Company as of the
date of this Service Agreement, including but not limited to the compressors,
regulators, meters and support facilities.

         1.44 "Transportation" shall mean the Gas, whether by exchange, backbaul
actual or constructive method or transmission of or any other movement.

         1.45 "Week" shall mean a period of seven (7) consecutive days beginning
at 9:00 a.m. Central Clock Time on each Monday and ending at the same time on
the next succeeding Monday.

         1.46 "Year" shall mean a period of three hundred sixty-five (365)
consecutive days, or three hundred sixty-six (366) consecutive days when such
period includes a February 29.

                                    ARTICLE 2
                              CONDITIONS TO SERVICE

         2.1 Firm Intrastate Transportation Service (FTS) and Interruptible
Intrastate Transportation Service (ITS) shall be subject to the following
conditions:

         (a) Gas is physically delivered to Company for transportation
             hereunder;

         (b) Customer has a Gas supply and appropriate upstream and/or
             downstream transportation for such Gas with the effect that
             Customer will be able to actually and efficiently utilize the
             transportation service;

         2.2 It is recognized that Company has authority to negotiate and vary
from customer to customer the terms and conditions and general provisions of the
Agreement, the Service Order(s), the rates and other charges, and each of the
General Terms and Conditions, including but not limited to the fees to be
charged thereunder, provided that similarly situated customers will be treated
in a comparable manner.
<PAGE>

                                    ARTICLE 3
                          RESTRICTIONS AND RESERVATIONS

         3.1 It is understood and agreed that Customer has only the right to the
service being rendered by the Company. All equipment, including (but not in any
way limited thereto) all pipe, valves, fittings, and meters, comprising the
Systems and all other property and capacity rights and interests, shall at all
times during the term of the Service Agreement remain the property of Company.
Customer agrees not to cause or permit any liens or encumbrances to be filed
with respect to the Systems or by reason of Customer's actions. Customer's Gas
shall at all times remain the property of Customer and Company shall have no
right or property interest therein, except as otherwise provided in a Service
Agreement or Service Order.

         3.2 Company reserves the right in its sole discretion to remove,
relocate, expand, or rebuild, without approval of Customer, any portion of the
Systems. Customer shall make no alterations, additions, or repairs to or on the
Systems, nor shall Customer bear any cost of any alterations, additions,
repairs, maintenance or replacements made to or on said Systems provided,
however, Customer shall be temporarily excused from its obligations hereunder
during any period of curtailment or suspension for the period of any such
suspension of deliveries, if service to Customer is curtailed or suspended for
more than twenty-four (24) consecutive hours. Notwithstanding the foregoing, the
Company agrees not to remove the service line to Customer and related tap added
to provide service to Customer.

         3.3 Customer agrees not to connect or cause the connection of any third
party to the Systems for any purpose without the express written approval and
consent of Company to be granted in Company's sole discretion. If this condition
is breached by Customer, Company shall have the right and option,
notwithstanding any other provision of the Service Agreement or the General
Terms and Conditions, to terminate the Service Agreement including the Exhibits
thereto immediately and without further obligation to Customer.

         3.4 Company presently is rendering service to third parties on the
Systems and shall have the right in the future to render additional service for
such purposes and to render service to additional third parties as it may
desire, and Company shall have the right to make additional connections to the
Systems as may be required to serve presently existing and new customers.

         3.5 Company shall own any and all liquids which are recovered from the
Systems and may use, sell or transfer all liquids without having to account in
any manner, or pay any monies or other consideration to Customer. Company agrees
to receive and deliver thermally equivalent volumes of natural Gas in connection
with such service less the applicable Fuel and Use Quantity.

                                    ARTICLE 4
                                   OPERATIONS

         4.1 Customer shall deliver its Gas or cause its Gas to be delivered
into the Systems at the Point(s) of Receipt described on the applicable Service
Order, as it now exists and as it may be amended. Customer shall have no right
to require Gas to be received at any particular Point(s) of Receipt and except
as provided in the following sentence Company may delete such points or modify
the capacity thereof from time to time and at any time in its reasonable
discretion with no further obligation to Customer with respect to such Point(s)
of Receipt. Notwithstanding the above, Company will not terminate Point(s) of
Receipt listed on Schedule A-1 List #4, Schedule A-1 List #6 and Schedule A-2
List #2 without Customer's mutual agreement. All supplies of Gas delivered to
the System must comply with the terms and conditions of the Service Agreement.
Customer recognizes and agrees that the use of any of the Interstate Point(s) to
transport Gas to Company for Customer's account may be terminated at any time by
Company's sole and absolute discretion upon thirty (30) days written notice to
Customer. Customer hereby waives and releases Company from any claim that may
arise in the future against Company by reason of or with respect to the
termination of the use of any of the Interstate Point(s). Customer recognizes
that the Gas which it causes to be received or delivered at the Interstate
Point(s) must be Gas which is not subject to regulation under the Natural Gas
Act, as amended (NGA) and is delivered to the Interstate Point(s) from the
wellhead pursuant to Section 3 11(a) of the Natural Gas Policy Act of 1978, as
amended (NGPA). In consideration of Company providing for use such Interstate
Point(s), Customer hereby warrants and represents that the Gas which it causes
to be received or delivered at the Interstate Points is not subject to
regulation under the NGA and is
<PAGE>

transported to the Interstate Points from the wellhead pursuant to Section
311(a) of the NGPA. In no event shall Company be required to expand, modify,
construct, rearrange, or change the operations of the System in order to receive
Gas from or on behalf of Customer at any existing Point(s) of Receipt or in
order to deliver Gas to Customer at any existing Point(s) of Delivery, provided,
however, Company shall own and operate necessary natural gas pipeline and
interconnection facilities to provide the transportation service identified in
its tariff and applicable Service Order. Additions or deletions may be made to
the Point(s) of Receipt or Point(s) of Delivery in the Service Agreement and
shall be considered to be new transactions.

         4.2 Customer shall advise (in a method and format applied by the
Company to its customers) Company with respect to each Day, Week and Month the
name of each supplier with whom it has a contract on Company's system (and the
name of the individual with such suppliers responsible for Customer's account),
which source of supply is delivering to Company, how much Gas is nominated to be
delivered to Company from each source of supply (i.e., each well, plant, or
other desired Point(s) of Receipt) and the anticipated deliveries at each
Point(s) of Delivery. Customer's nomination shall be in good faith and shall be
based on Customer's reasonable efforts to estimate usage for that next Day, Week
and Month. Customer shall not intentionally nominate more or less Gas than is
needed by Customer, except as may be needed for balancing purposes. If during a
Month, Customer's other supplies are renominated or reallocated, if Customer's
operations are modified in any manner or if it appears that the original
nomination was incorrect, the Customer shall immediately renominate to Company
during such Month, but in no event shall such renomination exceed any maximum
limitations established by the Parties. At intervals reasonably required by
Company, Customer shall be obligated to furnish Company with schedules showing
the daily Dekatherms of Gas Customer desires to deliver at each Point(s) of
Receipt. Company may, upon reasonable notice to Customer, from time to time
modify its nomination requirements and nomination deadlines as needed to meet
operational requirements or to conform to common industry practices and
procedures.

          4.3 (a) Receipt and Delivery nominations received from Customers shall
be made available to Point Operators for their confirmation to deliver or
receive such nominated Gas flow volumes. Point Operator may confirm and schedule
nominations at the lesser of the nominated volume or the volume of gas available
for delivery as determined by the Point Operator. If no communication is
received from the Point Operator, nominations stand as confirmed.

              (b)  Prior to the start of the flow day, for which nominations are
                   made by Customer, Company will confirm to Customer the amount
                   scheduled for delivery for such day.

              (c)  The standard nominations shall be made as follows: 11:45 a.m.
                   for nominations leaving control of the Customer; 11 .45 a.m.
                   for receipt of nominations by Company; 3:30 p.m. for receipt
                   of completed confirmations by Company from upstream and
                   downstream connected parties; 3:30 p.m. for receipt of
                   scheduled quantities by Customer and Point Operator (Central
                   Clock Time on the day prior to flow of the Gas so nominated).

              (d)  Intra-day nominations are those submitted after the
                   nominations deadline to be effective for either the same Gas
                   Day or for the next Gas Day and runs through the end of that
                   Gas Day. A Customer may submit an intra-day nomination up to
                   4 hours prior to Gas flow. Intra-.Day nominations shall be
                   scheduled after all timely nominations. Intra-Day nomination
                   shall not bump scheduled Gas for that Gas day unless the
                   upstream or downstream Point Operator requires a change in
                   scheduled Gas.

              (e)  Company and Customer shall comply with the forecasting
                   requirements and Customer's nominations shall conform to the
                   requirements set forth in Schedules A-1, A-2, A-3 and A-4
                   attached to Customer Service Order A1, A-2, A-3 and A-4
                   attached to the Agreement.

         4.4 Scheduling of Point(s) of Receipt or Point(s) of Delivery shall be
made by the party

<PAGE>

performing the measurement function. In the event Company is the measuring party
the following priority shall be applied:

         (a)  Firm Sales Services;

         (b)  Firm Intrastate Transportation Service;

         (c)  Interruptible transportation service under the terms of which gas
              is delivered to and received from ONEOK Texas Gas Storage, L.P.
              ("OTGS"), under the provision of a gas storage agreement by and
              between OTGS and Customer or by and between OTGS and a third
              party;

         (d)  Interruptible transportation services.

         4.5 Customer's Gas shall be delivered to Customer at the Point(s) of
Delivery. To the extent that Customer's acts or omissions cause Company to
incur, directly or indirectly, fees, charges, expenses, or penalties from a
supplier or a transporter of Gas to Company for failure to satisfy such
supplier's or transporter's balancing or nomination requirements, then Customer
agrees to reimburse Company for such fees, charges, expenses, or penalties, and
defend, indemnify, and hold Company harmless with respect thereto. To the extent
that Company's acts or omissions cause Customer to incur, directly or
indirectly, fees, charges, expenses, or penalties from a supplier or a
transporter of Gas to Customer for failure to satisfy such supplier's or
transporter's balancing or nomination requirements, then Company agrees to
reimburse Customer for such fees, charges, expenses, or penalties, and defend,
indemnify, and hold Customer harmless with respect thereto.

          4.6 The Point(s) of Receipt and Point(s) of Delivery may be, or may
later become points through which other quantities of Gas are being measured;
therefore, the measurement of Gas under the Service Agreement may involve the
allocation of Gas deliveries. In such event, each party hereto will furnish, or
cause to be furnished, to the extent the information is available, to the other
party all data required to accurately account for all Gas.

          4.7 Except as may be set forth on a Service Order, Company shall
receive and deliver Gas hereunder as nearly as practicable at uniform hourly and
daily rates of flow. It is recognized that it may be physically impracticable,
because of measurement, Gas control limitations and other operating conditions,
to stay in zero (0) imbalance each Hour and each Day; therefore, the daily and
hourly quantities received may, due to the aforementioned reasons, vary above or
below the daily and hourly quantities delivered. If the quantities received and
the quantities delivered hereunder should create an imbalance at the end of any
Hour, Day, Week, or Month, then Company and Customer shall adjust receipts
and/or deliveries such that the quantities received and delivered shall be kept
as near to zero (0) imbalance as practicable.

         4.8 (a) Company reserves the right to issue an Operational Flow Order
to alleviate conditions, inter alia, which threaten the safe operations or
system integrity of the Company's system or to maintain operations required to
provide efficient and reliable service.

         (b)  Curtailment and interruption of service may be ordered by the
              Company at any time if, in Company's reasonable judgment, capacity
              or operating conditions so require or it is desirable or necessary
              to make modifications, repairs or operating changes, the conduct
              of which will occasion interruption, upon such notice as is
              reasonable under the circumstances.

         (c)  Curtailment of service because of events of force rnajeure or
              described in the foregoing subparagraphs 4.8(a) or (b) shall be in
              the following order beginning with interruptible transportation
              under Subsection 4.8 (c)(4) and ending with firm intrastate sales
              under Subsection 4.8 (c)(I).:

                  (1) Firm intrastate sales.

                  (2) Firm intrastate transportation service. Should Firm
              Intrastate Transportation Service require curtailment, then FTS
              shall be curtailed in accordance with Section 2.10 of the
              Agreement.

<PAGE>

         (3) Interruptible transportation service under the terms of which gas
is delivered to and received from ONEOK Texas Gas Storage, L.P. ("OTGS"), under
the provision of a gas storage agreement by and between OTGS and Customer or hy
and between OTGS and a third party.

         (4) Intermptible transportation service. Within priority 4.,
interruption shall be administered so that service under the lowest valued
contract is interrupted first and service under the highest valued contract is
interrupted last.

(d)  Subject to the foregoing Sections 4.1 through 4.7, Customer shall exercise
     reasonable efforts to deliver to the applicable System the Dekatherms of
     Gas that Company is to deliver from the applicable System to Customer
     during any particular Hour, Day, Week and Month, including but not limited
     to volumes needed for peak day usage by Customer's customers.

(e)  In no event shall Company be required to accept a request for service for a
     quantity of Gas which Company cannot meter with reasonable accuracy at the
     Point(s) of Receipt or Delivery. If Customer's request for service involves
     a quantity which Company cannot meter with reasonable accuracy at the
     requested Point(s) of Receipt or Delivery, Company will promptly so inform
     Customer and advise Customer of the quantity that can be metered with
     reasonable accuracy at the proposed Point(s) of Receipt and Delivery.

(f)  Customer shall make all necessary arrangements with other parties at or
     upstream of the Point(s) of Receipt where natural Gas is delivered to
     Company by Customer or for Customer's account, and downstream of the
     Point(s) of Delivery where natural Gas is to be delivered by Company to or
     for the account of Customer, which arrangements shall be compatible with
     Company's system operations and coordinated with Company's Gas control
     department.

(g)  Company shall not be required to render service on behalf of Customer in
     the event that all facilities necessary to render such services do not
     exist at the time such service is scheduled to begin.

(h)  Company shall not be required to provide service if Company or any of its
     other customers will be required to purchase new quantities of Gas from any
     source or to increase purchases from existing suppliers in order to render
     such service.

(i)  Except as provided in Section 4.1 or as otherwise provided in the
     Agreement, hereof, Company shall not be required to acquire, construct,
     install, operate, modify, maintain, continue in existence or ownership of,
     or rearrange any facilities specifically applicable to an individual
     Customer in order to provide any service. Company may, in its reasonable
     discretion, and with the agreement of the Customer, agree to acquire,
     construct, install, operate, modify or rearrange any such necessary
     facilities, subject to the provisions hereof, in order to provide service.
     Company's determination as to the maintenance or continued maintenance,
     existence or ownership of any facility shall be made in Company's
     reasonable discretion. In the event Company agrees to acquire, construct,
     install, operate, modify or rearrange facilities, then Company shall have
     the right to condition its agreement to so acquire, construct, install,
     operate, modify or rearrange their facilities by requiring that Customers
     bear and/or pay Company for all or part of costs associated with the
     acquisition, installation, construction, modification, operation, and
     rearrangement of such facilities.

(j)  Should any litigation be commenced between the Company and Customer
     concerning any provision of the Service Agreement or the rights and duties

<PAGE>

     hereunder, the party prevailing in such litigation shall be entitled, in
     addition to such other relief as may be granted in such proceeding, to a
     reasonable sum as and for its attorney's fees in such litigation, which sum
     shall be determined in such litigation or in a separate action for such
     purpose.

        4.9 If, pursuant to the foregoing Article IV, Company curtails or
temporarily discontinues the receipt or delivery of Gas hereunder, Customer
agrees to hold Company harmless from any loss, claim, damage, or expense that
Customer may incur by reason of such curtailment or discontinuance. Company's
rendering of service hereunder shall not obligate Company in any manner beyond
the terms of the Service Agreement and the Exhibits attached thereto.

                                    ARTICLE 5
                           PRESSURE AND QUALITY OF GAS

          5.1 Customer shall deliver (or cause to be delivered) the Gas to the
Systems at the Point(s) of Receipt at a pressure sufficient to effect delivery
into the Systems at that point. If necessary, Customer shall provide additional
compression to make such deliveries hereunder, and Company shall not have any
cost or responsibility in that regard. Company shall not be obligated to accept
Gas at pressures greater than the maximum allowable operating pressure for the
System facilities into which such Gas is flowing.

          5.2 Subject to the provisions of Section 4.8 above, the Gas shall be
delivered to Customer from the System at the Point(s) of Delivery at pressures
sufficient to effect deliveries to Point Operator's facilities, but not to
exceed the pressure that is available at such Point(s) of Delivery. Company
shall not be required to compress Gas in order to make deliveries hereunder.

        5.3 Gas delivered by and to Customer shall be commercially free of dust,
gums, gum-forming constituents, gasoline, water, and any other substance that
may become separated from the Gas during the handling hereof. All Gas received
shall conform to the following additional specifications:

        (a)   Contain not more than one-quarter (1/4) grain of hydrogen sulfide
              per 100 cubic feet, as determined by a method generally acceptable
              for use in the Gas industry;

        (b)   Contain not more than two (2) grains of total sulfur per 100 cubic
              feet;

        (c)   Contain not more than two percent (2%) by volume of carbon
              dioxide;

        (d)   Contain not more than four percent (4%) by volume of total inerts,
              including carbon dioxide and nitrogen.

        (e)   Contain not more than ten parts per million by volume of oxygen;

        (f)   Contain a gross heating value equivalent to at least 950 British
              Thermal Units per cubic foot and not to exceed 1100 British
              Thermal Units per cubic foot;

        (g)   Have a temperature of not more than one hundred twenty degrees
              (120(0)) Fahrenheit nor less than forty degrees (40(0));

        (h)   Contain no water or hydrocarbons in liquid form; and

        (i)   Contain not more than 7 pounds of water in vapor stage per 1,000
              Mcf of Gas.

      5.4 Customer agrees to supply Company, at Company's request at any time
and from time to time, a sample of liquids removed from the Gas stream of the
facilities which deliver Gas to Company, which sample is to be taken from a
point upstream from the Point(s) of Receipt. Said sample shall not contain any
toxic, hazardous, or deleterious materials or any materials which Company, in
its sole discretion, deems in any way harmful to its facilities, personnel or
the environment, including, but not limited to, polychlorinated biphenyls
(PCBs), and substances or materials considered hazardous or other similar terms,
or requiring investigation, remediation or removal under any federal, state or
local statute, regulation, rule or ordinance or any amendments thereof, whether
now in effect or as may be in effect in the future. If such samples contain any
such

<PAGE>

materials or substances, Company shall have the right, in its sole discretion
and in addition to other remedies available to it, to immediately cease receipt
of Gas through the Point(s) of Receipt until such time as all such materials or
substances are eliminated from the Gas such that Company, in its sole
discretion, elects to again receive such Gas through the Point(s) of Receipt.
Should Customer fail or refuse to eliminate all such materials or substances
within a reasonable time, Company shall have the right, upon written notice, to
terminate the Service Agreement. Customer hereby expressly agrees to indemnify
and hold Company and Company's affiliates and personnel harmless from and
against any and all liabilities, losses, claims, damages, actions, costs, fines,
and expenses of whatever nature, including, but not limited to, court costs and
attorneys' fees arising out or in any manner relating to the presence of PCBs
and/or any other toxic, hazardous, deleterious, harmful, or unsafe materials as
described above in Gas delivered into Company's System.

        5.5(a) If the Gas offered for delivery to Company at the Point(s) of
Receipt or made available to or on behalf of Customer at the Point(s) of
Delivery has failed at any time to conform to any of the specifications set
forth in this Article 5, then the party receiving such Gas (the "receiving
party") shall notify the other party (the "tendering patty") of such deficiency
and thereupon the receiving party may at its option refuse to accept such Gas
pending correction by the tendering party. Upon the tendering party's failure
promptly to remedy any deficiency in quality as specified in this Article 5, the
receiving party may accept such Gas and may make changes necessary to bring such
Gas into conformity with such specifications, and the tendering party shall
reimburse the receiving party for any reasonable expense incurred by it in
effecting such changes. In no event shall the failure of any Gas offered for
delivery to Company by Customer or for Customer's account to conform to any of
the specifications set forth in this Article S relieve Customer of Customer's
obligation to pay any service charges incurred with respect to such Gas.

                                    ARTICLE 6
                           RATES, CHARGES AND PAYMENT

        6.1 If Firm Intrastate Transportation Service is provided pursuant to
the Service Agreement, the Customer shall pay the following to Company, as
mutually agreed to and set forth on the applicable Service Order:

        (a)   A Monthly Demand Rate which shall be the charge of the various
              components as identified on the Service Order. The Monthly Demand
              Rate shall be paid whether or not Customer nominates and/or
              accepts delivery of Gas from the System, except as may be provided
              in Section 10.2 hereof

        (b)   The Monthly Commodity Charge which shall be the product of (i) the
              actual Gas delivered to the Point(s) of Delivery, and (ii) the
              commodity fee as set forth on the Service Order.

        (c)   Other fees and charges set forth in the Agreement, Exhibits and
              Schedules.

        6.2 If Interruptible Transportation Service is provided pursuant to the
Service Agreement, Customer shall pay the following to Company, as mutually
agreed to and set forth on the applicable Service Order;

        (a)   The Commodity Fee which shall be the product of (i) the actual Gas
              delivered to the Point(s) of Delivery, and (ii) the commodity rate
              as set for on the Service Order.

        6.3 In addition to the amounts paid pursuant to Subsections 6.1 or 6.2
above, Customer shall also pay or deliver to Company the following:

        (a)   Any other provision or charge which may be agreed to between
              Company and Customer;

        (b)   Fuel and Use Quantity; and

        (c)   Except as provided below, Customer shall pay all applicable
              surcharges, fees, taxes, charges, and assessments imposed by or on
              behalf of any governmental entity in connection with the Service
              Agreement or in connection with the purchase, transportation and
              disposition of Gas by or on behalf of Customer pursuant to the
              Service Agreement including but not limited to

<PAGE>

              municipal and/or supplemental fees, franchise fees and any
              supplements thereto and taxes; provided that Company shall pay all
              ad valorem taxes and assessments levied on the System and all
              appurtenant facilities. Company shall file all returns required
              for the Systems and all appurtenant facilities. At the request of
              Company, Customer will furnish Company with any information
              available to Customer in connection with Company's obligations
              under this section.

          6.4 Customer agrees to pay any amounts due pursuant to the Service
Agreement and the General Terms and Conditions to Company within ten (10) days
after receipt of an invoice from Company such payment to be made by wire
transfer to the account designated by the Company in writing.

          6.5 Should Customer fail to pay any amount or deliver any Gas due
under any Service Agreement when such amount is due, interest on the unpaid
portion shall accrue at a rate (which in no event shall be higher than the
maximum rate permitted by applicable law) equal to one and one-half percent
(1-1/2%) per month from the due date until the date of payment. If such failure
to pay continues for thirty (30) days after payment or delivery is due, Company,
in addition to any other remedy it may have, may suspend further receipts and
deliveries of Gas until such amount is paid or delivered; provided, however,
that if Customer in good faith shall dispute in writing the amount of any such
bill or part thereof and shall pay and deliver to Company such amounts as
Customer concedes to be correct and, at any time thereafter within thirty (30)
days of the due date of such payment, shall furnish a good and sufficient surety
bond in an amount and with surety satisfactory to Company, guaranteeing payment
and delivery to Company of the amount ultimately found due upon such bills,
including interest thereon, after a final determination which may be reached
either by agreement or judgment of the courts, as may be the case, then Company
shall not be entitled to suspend further receipts and withdrawals of Gas unless
and until default be made in the conditions of such bond. As an alternative to
posting a bond, Customer may pay the portion of any amount in dispute without
waiving its rights to recoup any monies improperly billed. If the portion of any
amount in dispute is ultimately determined to be incorrect, such amount shall be
refunded by Company to Customer together with interest thereon at a rate (which
in no event shall be higher than the maximum allowed by law) equal to one and
one-half percent (1-1/2%) per Month for the period from the date of payment to
Company to the date of refund by Company.

                                    ARTICLE 7
                             STATEMENTS AND RECORDS

          7.1 On or before the twenty-fifth (25th) day of each calendar month
after commencement of Gas receipts and deliveries hereunder, Company shall
render to Customer a statement for the preceding Month showing the total
Dekatherms of Gas received and delivered and each Point(s) of Receipt and
Point(s) of Delivery, and any information needed to explain and support any
adjustment made by Company. Any such statement (and supporting documents) may
also be sent to Customer's suppliers of Gas. When information necessary for
statement purposes is in the possession of Customer and is requested by the
Company, Customer shall furnish such information to Company on or before the
tenth (10th) day of the Month in which the statement requiring such data is to
be rendered.

         7.2 Both parties hereto shall have the right at any and all reasonable
times to examine the books and records of the other to the extent necessary to
verify the accuracy of any statement, computation, or demand made hereunder.
Both parties shall preserve for a period of two (2) years all test data, charts
and other similar records If it shall be found at any time or times that
Customer has been overcharged or undercharged in any form whatsoever under the
provisions of the Service Agreement and Customer shall have actually paid the
bills containing such overcharge or undercharge, then within thirty (30) days
after the final determination thereof, Company shall refund the amount of any
such overcharge, or Customer shall pay the amount of any such undercharge,
provided, however, that interest calculated in accord with Section 6.5 shall
apply to any undercharge or overcharge not paid within thirty (30) days from the
date of notification to the party who owes payment of the amount of the
undercharge or overcharge. In the event an error is discovered in the amount
billed in any statement rendered by Company, such error shall be adjusted within
thirty (30) days of the final determination thereof provided

<PAGE>

that claim therefor shall have been made within sixty (60) days from the date of
discovery of such error but, in any event, within twenty-four (24) months from
the date of payment.

         7.3 Company shall establish and operate a website if required by state
statute or government regulation for Texas intrastate pipelines.

                                    ARTICLE 8
                             MEASUREMENT AND TESTS

          The measurement and tests for quality of Gas received and delivered by
Customer hereunder shall be governed as follows:

         8.1 The quantities of Gas received and delivered shall be measured by
means of meters of standard type which conform to the American Gas Association
Measurement Committee Reports and other industry standards as to construction
and installation.

         8.2 The unit of volume for purposes of measurement shall be one (1)
cubic foot of Gas at a temperature base of sixty degrees (60(0)) Fahrenheit and
at a pressure base of fourteen and seventy-three hundredths (14.73) pounds per
square inch absolute. The assumed atmospheric pressure shall be as nearly
correct as possible for all locations. The atmospheric pressure for individual
meters shall be calculated per the most recent AGA equation based upon actual
elevation when the actual elevation is available; if actual elevation for an
individual meter is not available, then the elevation for the closest town can
be utilized.

         8.3 Temperature shall be determined by a recording thermometer
continuously used and installed according to Paragraph 8.1.

         8.4 Specific gravity shall be determined with accuracy to the nearest
one thousandth (.001) by use of an instrument that conforms to industry
standards.

         8.5 Whenever the conditions of pressure and temperature differ from the
standards, conversion of the volumes from these conditions to the standard
conditions shall be in accordance with the Ideal Gas Laws corrected for
deviation from Boyle's Law, all to be in accordance with methods and tables set
out in the American Gas Association Measurement Committee Reports, or by other
accepted methods that may be used from time to time.

         8.6 The heating value of the Gas shall be determined by means of a
sampling method of general use in the Gas industry. The location of the sampling
equipment shall be determined by Company in its sole discretion but shall be at
a location where a representative sample of the Gas to which it applies may be
taken.

         8.7 Tests to determine total sulfur, hydrogen sulfide, oxygen, carbon
dioxide, total inerts and water vapor shall be made by approved standards
methods in general use by the Gas industry. Such tests shall be made at the
request of either party hereto. If a test is performed at Customer's request and
shows that the quality specifications as set forth in Section 5.3 hereof have
been satisfied, Customer shall pay all costs and expenses of Company related to
such test. In all other instances costs and expenses of Company related to such
tests shall be born by the Company.

         8.8 Except as otherwise provided, all measuring and testing equipment,
housing devices, and materials shall be standard manufacture and type and shall,
with all related equipment, appliances, and buildings, be owned, installed,
maintained and operated or caused to be installed, maintained and operated by
Company at the Point(s) of Receipt.

         8.9 Electronic Flow Measurement ("EFM")

         (a)  With respect to any Point(s) of Receipt or Point(s) of Delivery
              requested by Customer after June 1, 2002, where more than 500
              MMBtu of gas per day is delivered, the Company, at its sole
              discretion, may require to be installed an EFM device which
              transmits readings from the meter to the Company's facility via
              telephonic connection or other means.

         (b)  Company shall own the EFM device (and all rights to the data and
              information produced thereby) and neither Customer nor any other
              party shall have any right to repair, replace, modify, change or
              interconnect other

<PAGE>

              equipment or facilities with such devices or provide third parties
              with information or data therefrom, without Company's prior
              written consent.

         (c)  No meter fixtures or devices, nor any EFM reading device shall be
              installed on the Company's meter without the Company's prior
              written consent.

         (d)  Company shall not be liable or responsible for the consequences of
              any utilization by Customer or any other party of information or
              data obtained from the EFM device, including, without limitation,
              any liability for direct, indirect, consequential, punitive or
              special damages, in tort or in contract.

         8.10 The accuracy of the measuring and testing equipment shall be
verified according to Company's standard for the device being used and at other
reasonable times upon request of Customer or Company. Gas quality tests may be
made at times of equipment testing or at other reasonable times. Notice of the
time and nature of each test shall be given by Company to the Customer at least
five (5) days in advance of such test. If a test is requested by a Customer,
then Company shall give Customer notice sufficiently in advance to permit
Customer to have a representative present. Representatives of both Customer and
Company may be present to observe such tests. The results of any such tests
shall be considered accurate until the next tests are made. All tests of
measuring equipment shall be paid by the party owning such measuring equipment,
provided, however, if a test has been requested by the Party not owning the
metering equipment and the inaccuracy found is two percent (2%) or less, the
Party requesting such test shall bear the expense of such test.

         8.11 If, at any time, any of the measuring or testing equipment is
found to be out of service, or registering inaccurately of any percentage, it
shall be adjusted at once to read accurately within the limits prescribed by the
manufacturer. If such equipment is out of service or inaccurate by an amount
exceeding two percent (2%) at a reading corresponding to the average rate of
flow for the period since the last preceding test, the previous reading of such
equipment shall be disregarded for any period definitely known or agreed upon,
or if not so known or agreed upon, for a period of time equal to one-half of the
elapsed time since the last test. The volume of Gas delivered during such period
shall be estimated (i) by using the data recorded by any check measuring
equipment if installed and accurately registering, or if not installed or
registering accurately, (ii) by correcting the error if the percentage of error
is ascertainable by calibration, test, or mathematical calculation, or if
neither such method is feasible, (iii) by estimating the quantity or quality
delivered based upon deliveries under similar conditions during a period when
the equipment was registering accurately. No adjustment shall be made for
recorded inaccuracies of two percent (2%) or less.

         8.12 The parties hereto shall have the right to inspect equipment
installed or furnished by the other or third-party operators and the charts and
other measurement or testing data of all such parties at all times during
business hours; but the reading, calibration, and adjustment of such equipment
and changing of charts shall be done only by the party installing and furnishing
the same. The parties hereto shall preserve all original test data, charts and
other similar records in such party's possession for a period of at least
twenty-four (24) months.

         8.13 At every Point(s) of Receipt and every Point(s) of Delivery, the
party having control over such facility shall allow the other party immediate
access to the receipt and delivery information as it is generated by the party
having such control. With respect to all Point(s) of Receipt and Point(s) of
Delivery that have electronic flow measurement, both parties may have remote
telephone and electronic access to the receipt and delivery information
generated at such Point(s) of Receipt and Point(s) of Delivery.

                                    ARTICLE 9
                       TITLE TO AND RESPONSIBILITY FOR GAS

         9.1 Customer warrants title to all Gas delivered by it into the Systems
hereunder, and Customer warrants and represents that it has the right to deliver
the Gas hereunder, and that such Gas is free from liens and adverse claims of
every kind. Customer agrees to defend, indemnify and save Company harmless from
and against all loss, damage, claims, and expense of every character with
respect to Gas delivered by it on account of royalties, taxes, payments, liens,
or other charges or claims arising (1) before or created upon delivery of said
Gas into the

<PAGE>

Systems, and (2) upon and after delivery of said Gas from the Systems to or for
the account of Customer.

         9.2 As between the parties hereto, Customer or its supplier shall be
deemed to be in the exclusive control and possession of the Gas until such Gas
has been delivered to Company at the Point(s) of Receipt, and after its
withdrawal by or for the account of Customer at the Point(s) of Delivery. After
Customer's or Customer's suppliers' delivery of such Gas at the Point(s) of
Receipt, Company shall thereafter be deemed to be in the exclusive control and
possession of such Gas until its withdrawal by Customer at the Point(s) of
Delivery. The party which shall be in the exclusive control and possession of
such Gas shall be responsible for all injury or damage caused thereby and shall
be responsible for any loss of Gas while in its possession, except with regard
to injury, damage or loss caused by or arising out of the negligence of the
nonpossessory party.

         9.3 The Systems shall at all times remain the property of Company, and
Customer shall have no right or property interest therein but only the right for
the service to be rendered.

                                   ARTICLE 10
                           FORCE MAJEURE AND CASUALTY

         10.1 If either Company or Customer or Point Operator is rendered
unable, wholly or in part, by reason of force majeure or any other cause of any
kind not reasonably within its control, whether or not such force majeure event
or cause was foreseeable at the time the Service Agreement is entered into, to
perform or comply with their obligations hereunder, then such party's
obligations or conditions shall be suspended during the continuance of such
inability and such party shall be relieved of liability for failure to perform
the same during such period; provided, however, obligations to make payments
when due hereunder shall not be suspended. Any force majeure event (other than
labor disputes, strikes, or lockouts) shall be remedied so far as possible with
reasonable dispatch. Settlement of strikes, lockouts, and labor disputes shall
be wholly within the discretion of the party having the difficulty. The term
"force majeure" shall include, but is not limited to, the following: acts of God
and the public enemy; the elements; fire, tornadoes, freezing of pipelines,
accidents, breakdowns, strikes; any industrial, civil, or public disturbance;
inability to obtain or delay in obtaining rights-of-way, material, supplies,
permits, or labor; any act or omission by parties not subject to control by the
party hereunder having the difficulty; and any laws, orders, rules, regulations,
acts or restraints of any governmental body or authority, civil or military.

         10.2 If a portion of the System required to make the service available
is partially damaged by fire or other casualty, the damage may be repaired by
Company, at its option and in its sole discretion, as speedily as practicable,
due allowance being made for the time taken for the settlement of insurance
claims. In such event, Company shall notify Customer thereof as soon as
reasonably possible. Until such repairs are made, the payments shall be
apportioned in proportion to the portion of the capacity of the System which is
still available for the purposes hereof, such determination to be made in the
reasonable discretion of Company. If the damage is so extensive as to render the
System wholly unusable, in Company's reasonable opinion, the payments, if any,
shall cease until such time as the System is again useable. In case the damage
shall, in Company's reasonable opinion, amount substantially to a destruction of
the portion of the Systems available for the transportation of Gas and Company
shall elect not to repair the damage, then the Service Agreement shall terminate
at the time of such damage, and Company shall not be liable to Customer for any
liability, damage, or claim which arises out of any failure to make repairs.
Notwithstanding the above, if there is damage to a Company System that is the
sole source of service to Customer's human need customers (residential,
hospitals, schools, etc.) Company will use every commercially reasonable effort
to restore service as soon as reasonably possible.

                                   ARTICLE 11
               GOVERNMENTAL RULES, REGULATIONS, AND AUTHORIZATIONS

         11.1 The Service Agreement is subject to all valid orders, laws, rules,
and regulations of duly constituted State and Federal governmental authorities
and agencies having jurisdiction or control over the parties, their facilities
or Gas supplies, the Service Agreement, or any provision hereof. If at any time
during the term of the Service Agreement any such governmental authority shall
take any action as to any party whereby the delivery and receipt of Gas, as
contemplated herein, shall be proscribed or subjected to terms, conditions,
restraints, or regulations, including rate or price controls or

<PAGE>

ceilings, that are burdensome to that party, such determination to be made by
the affected party in its reasonable discretion, the Service Agreement shall be
modified to the minimum extent possible so as to comply with such orders, laws,
rules and regulations. Otherwise, the Service Agreement shall remain in full
force and effect. Neither party shall have the right thereafter to cancel or
terminate the Service Agreement by reason of such modification to the Service
Agreement.

                                   ARTICLE 12
                                CREDITWORTHINESS

         12.1 Company shall not be required to initiate service on behalf of any
Customer or provide service or to continue service for any Customer who is or
has become insolvent or who, at Company's request, fails within a commercially
reasonable time to demonstrate credit worthiness as determined by the Company in
its reasonable discretion, provided, however, Customer may receive service if
Customer furnishes good and sufficient security as determined by Company in the
exercise of reasonable discretion. For the purpose of this section, the
insolvency of a Customer shall be evidenced by the filing by Customer or any
parent entity thereof of a voluntary petition in bankruptcy or the entry of a
decree or order by a court having jurisdiction over the premises adjudging
Customer bankrupt or insolvent or approving, as properly filed, a petition
seeking reorganization, arrangement, adjustment or composition or in respect of
the Customer under the Federal Bankruptcy Act or any other applicable federal or
state law or appointing a receiver, liquidator, assignee, trustee, sequestrator
(or other similar official) of the Customer or of any substantial part of its
property or the ordering of the winding-up or liquidation of its affairs, with
said order or decree continuing unstayed and in effect for a period of sixty
(60) consecutive days.

                                   ARTICLE 13
                                  MISCELLANEOUS

         13.1 Any modification of terms or amendment of any provisions hereof
shall become effective only by supplemental written agreement between the
parties.

         13.2 (a) Any of the following events or conditions shall constitute a
default of Customer under the Service Agreement:

                  (1) Default in the delivery of any payment or any sums
         hereunder for a period of thirty (30) days after the same becomes due,
         provided such sums are not disputed by Customer pursuant to and in
         accordance with Section 6.5 hereof,

                  (2) Any other breach of the material terms and conditions of
         the Service Agreement and the failure of Customer to cure such breach
         within thirty (30) days after written demand by Company or such longer
         period of time after such notice as may be reasonably required to cure
         such breach if the breach is not reasonably curable within such thirty
         (30) day period, provided that Customer shall have commenced such cure
         within such thirty (30) day period and thereafter diligently continues
         its efforts to cure such breach until such breach shall have been fully
         cured;

                  (3) Customer shall (i) apply for or consent to the appointment
         of or taking of possession by a receiver or liquidator of itself or
         substantially all of its property, (ii) make a general assignment for
         the benefit of its creditors, (iii) commence a voluntary case under the
         Federal Bankruptcy Code, or (iv) file a petition seeking to take
         advantage of any other law relating to bankruptcy, insolvency,
         reorganization, winding-up or composition or adjustment of debts of
         Customer;

                  (4) A proceeding or case shall be commenced, without the
         application or consent of the affected party, in any court of competent
         jurisdiction, seeking (i) liquidation, reorganization, dissolution,
         winding-up or composition or adjustment of debts of Customer (ii) the
         appointment of a trustee, receiver, liquidator or custodian of such
         party or of all or substantially all of its assets, or (iii) similar
         relief under any law relating to bankruptcy or insolvency, and such
         proceeding or case shall continue undismissed, or an order, judgment or

<PAGE>

         decree approving or ordering any of the foregoing shall be entered and
         continue unstayed, for a period of ninety (90) days; or

                  (5) If any certificate, representation or warranty furnished
         by Customer proves to be false or incomplete in any material respect.

         (b)  Upon the happening of any event of default as set forth in
              subparagraph 13.2(a) above, Company shall have the right to do any
              one or more of the following without demand or notice of any kind:

                  (1) Declare due, sue for, and receive from Customer the sum of
              all payments and all other amounts due and owing under the Service
              Agreement plus the sum of all payments and other amounts to become
              payable during the balance of the term of the Service Agreement;

                  (2) Retake possession of the entire capacity of the System
              without any court order or other process of law and without any
              rights of Company being thereupon terminated;

                  (3) Terminate the Service Agreement and any Service Order
              related thereto, and the Exhibits;

                  (4) Pursue any other remedy at law or in equity.

         (c)  Any of the following events or conditions shall constitute an
              Event of Default with respect to Company under the Service
              Agreement:

                  (1) Default in the crediting of any sums due to Customer or in
              the payment of any other sums due to Customer under the Service
              Agreement for a period of thirty (30) days after the same is
              established by Company to have become due;

                  (2) Company's breach of any material term or condition of the
              Service Agreement and the failure of Company to cure such breach
              within thirty (30) days after written demand by Customer or such
              longer period of time after such notice as may be reasonably
              required to cure such breach if the breach is not reasonably
              curable within such thirty (30) day period, provided that Company
              shall have commenced such cure within such thirty (30) day period
              and thereafter diligently continues its efforts to cure such
              breach until such breach shall have been fully cured.

                  (3) Company shall (i) apply for or consent to the appointment
              of or taking of possession by a receiver or liquidator of itself
              or substantially all of its property, (ii) make a general
              assignment for the benefit of its creditors, (iii) commence a
              voluntary case under the Federal Bankruptcy Code, or (iv) file a
              petition seeking to take advantage of any other law relating to
              bankruptcy, insolvency, reorganization, winding-up or composition
              or adjustment of debts of Company;

                  (4) A proceeding or case shall be commenced, without the
              application or consent of the affected party, in any court of
              competent jurisdiction, seeking (i) liquidation, reorganization,
              dissolution, winding-up or composition or adjustment of debts of
              Company, (ii) the appointment of a trustee, receiver, liquidator
              or custodian of such party or of all or substantially all of its
              assets, or (iii) similar relief under any law relating to
              bankruptcy or insolvency, and such proceeding or case shall
              continue undismissed, or an order, judgment or decree approving or
              ordering any of the foregoing shall be entered and continue
              unstayed, for a period of ninety (90) days;

                  (5) If any certificate, representation, or warranty furnished
              by

<PAGE>

         Company proves to be false incomplete in any material respect.

         (d) Upon the happening of any event of default as set forth in
             subparagraph 13.2(c) above, Customer shall have the right to do any
             one or more of the following without demand or notice of any kind:

                  (1) Declare due, sue for, and receive from Company the sum of
             all outstanding credits and other amounts due and owing under the
             Service Agreement;

                  (2) Terminate the Service Agreement and any Service Order
             related thereto, and the Exhibits;

                  (3) Pursue any other remedy at law or in equity.

         (e)  The rights granted to Company and Customer hereunder shall be
              cumulative as to each and action on one shall not be deemed to
              constitute an election or waiver of any other right to which
              Company or Customer may be entitled.

         (f)  Upon the termination of the Service Agreement, whether by lapse or
              time or otherwise, Customer will surrender any and all rights in
              the Systems immediately.

         13.3 Company shall not be liable to Customer by reason of the failure
of Company to deliver, or the Customer to receive, natural Gas when Customer has
been notified of such failure and such failure is caused by repairs,
maintenance, rebuilding, expansion, reduction, changes or adjustments in the
System or in Company's equipment and facilities. Company will cooperate with
Customer in the timing of repairs, maintenance, rebuilding, expansion,
reduction, changes and adjustments to the System to cause least impact to both
parties.

         13.4 No waiver by Company or Customer of any default or the other under
the Service Agreement shall operate as a waiver of any future default, whether
of a like or different character.

         13.5 The Service Agreement shall be binding upon, and inure to the
benefit of, the parties hereto and their successors and assigns. Neither the
Service Agreement nor the Exhibits attached thereto nor the rights and
obligations of either party hereunder may be assigned without the consent of the
other party, which consent shall not be unreasonably withheld or delayed
provided that the assignee demonstrates that it is financially capable of
performing the duties and obligations of the party making such assignment.

         13.6 Customer will not mortgage, create a security interest in, or
encumber the Service Agreement, or sublet the rights granted hereby, or permit
its use by others, or pledge, loan, sublet, create a security interest in, or in
any other manner attempt to dispose of such rights, or permit its use by others,
or suffer any liens or legal process to be incurred or levied thereon; provided,
however, that Customer may grant a security interest or similar encumbrance in
connection with any financing arrangement to be associated with Customer's
facility or replacement of such credit facilities.

         13.7 The payments under the Service Agreement have been computed on the
understanding that Company shall have the benefit of any investment credit
available under the applicable sections of the Internal Revenue Code, as
amended, with respect to the Systems and all appurtenant facilities related to
such System.

         13.8 THE SERVICE AGREEMENT SHALL BE INTERPRETED UNDER THE LAWS OF THE
STATE OF TEXAS, EXCLUDING ANY LAW THEREOF DIRECTING THE APPLICATION OF THE LAWS
OF ANOTHER JURISDICTION.

         13.9 Company and Customer agree to exercise and take reasonable steps
necessary to safeguard and cause their officers, directors, employees, agents,
advisers, and representatives to safeguard the confidentiality of the Service
Agreement and the terms and conditions thereof (as contrasted with the existence
and effectiveness of the Service Agreement which are not confidential) and not
to disclose any part of it or any information derived therefrom or any
negotiations relating thereto to any party or person except that limited number
of people within Company's and Customer's organizations, and their advisers,
lenders and potential investors, as may need to know the terms

<PAGE>

and conditions hereof in order to evaluate, understand, execute and perform the
Service Agreement. Company and Customer agree not to copy or permit the copying
of the Service Agreement, except as may be necessary for their operations. In
the event Customer or Company or any of their officers, directors, employees,
agents, attorneys, or representatives, is requested or required (by oral or
written question or request for information or documents in legal proceedings,
interrogatories, subpoena, Civil Investigative Demand or similar process) to
disclose any information concerning the Service Agreement or the terms and
conditions thereof or any negotiations relating thereto, it is agreed that the
party receiving such question or request will provide the other parties with
prompt notice thereof so that such other parties may seek a protective order or
other appropriate relief or a release from the other parties. It is further
agreed that if, in the absence of a protective order or receipt of a release,
the other party is compelled to disclose such information or else stand liable
for contempt or suffer other censure or penalty or adverse effect, then such
party may disclose such information. The parties hereto are further authorized
to make disclosure of the Service Agreement as may be required by Federal,
state, or local regulation or agency, or as may be required by auditors or
accountants in connection with the preparation of financial statements or tax
returns. Disclosure hereunder shall not constitute a basis for defense,
termination or modification of the Service Agreement.

         13.10 (a) Informal Resolution. Customer is first encouraged to work
with Company to resolve problems on an informal filing a formal complaint.

         (b) Formal Resolution. In the event of an unresolved problem, Customer
             should submit a complaint in writing to the Company at the
             following address:

         ONEOK WesTex Transmission, L.P.
         100 West Fifth Street
         Tulsa, Oklahoma 74103-4298
         Attn.:   Formal Complaint

         The complaint should contain sufficient facts to identify the specific
         transportation and/or problem involved and an explanation of why, in
         the Customer's opinion, the situation gave rise to the complaint. Such
         complaint shall state that it constitutes a complaint pursuant to the
         procedure.

         (c) Response Period. The Company shall respond to all complaints in
             writing within thirty (30) days of the date the complaint was
             received by the Company.

         (d) Additional Review. If the complaint is not resolved to the
             Customer's satisfaction, the Customer may request formal review by
             the Company's Vice President.

         13.11 The parties hereto agree, except with respect to the term as
stated in the Service Agreement, that any differences arising over the
performance of the Service Agreement, or an alleged breach thereof, or the
interpretation or effectuation of any provision contained herein, shall be
settled by arbitration pursuant to Oklahoma's Uniform Arbitration Act, 15 O.S.
1981, "801-18" as amended. Each party shall select one arbitrator, and the two
arbitrators so chosen shall then select a third person, who shall not have an
interest in the outcome of the controversy or be related to or have an economic
interest in or related to one of the other arbitrators or one of the parties
hereto. Each arbitrator must be familiar with the natural Gas industry. The
procedures to be followed in the arbitration, including discovery (if any is
ordered by the arbitrators or a majority thereof) shall be established by the
arbitrators, or a majority thereof. A decision of a majority of the arbitrators,
after a full hearing and opportunity to present the full case of each party, in
writing and with notification to the parties, shall be binding on the parties,
and be a condition precedent to any action at law or in equity relating to the
Service Agreement. Each party shall bear full responsibility for that party's
own expenses attendant to the arbitration proceeding, including attorneys' fees
and the fees and expenses of the arbitrator appointed by that party, and both
parties shall share equally in the payment of all other costs of the
arbitration.

         13.12 LIMITATION OF LIABILITY. EXCEPT AS OTHERWISE SPECIFICALLY
PROVIDED HEREIN, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY SPECIAL,
INDIRECT, INCIDENTAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES OF ANY CHARACTER,
INCLUDING BUT NOT

<PAGE>

LIMITED TO LOSS OF USE, LOST PROFITS (PAST AND FUTURE), ADDITIONAL OUT OF POCKET
EXPENSES INCURRED BY EITHER PARTY, OR TORT, CONTRACT OR OTHER CLAIMS RESULTING
FROM, ARISING OUT OF, IN CONNECTION WITH OR IN ANY WAY INCIDENT TO ANY ACT OR
OMISSION OF EITHER PARTY RELATED TO THE PROVISIONS OF THIS SERVICE AGREEMENT,
IRRESPECTIVE OF WHETHER CLAIMS OR ACTIONS FOR SUCH DAMAGES ARE BASED UPON
CONTRACT, WARRANTY, NEGLIGENCE, STRICT LIABILITY OR ANY OTHER REMEDY AT LAW OR
EQUITY.

         13.13 Conflict. In the event of a conflict between the terms and
conditions of the Transportation Service Agreement and the General Terms and
Conditions, the Service Agreement will control and in the event of conflict
between the Service Agreement, and/or the General Terms and Conditions, and the
Service Order, the terms and conditions of the Service Order control.
<PAGE>

                                     SAMPLE
                                  EXHIBIT A___
                              TO SERVICE AGREEMENT
                                     BETWEEN
                         ONEOK WESTEX TRANSMISSION, L.P.
                                       AND
                         ENERGAS COMPANY, A DIVISION OF
                            ATMOS ENERGY CORPORATION

                                  SERVICE ORDER

         ONEOK WesTex Transmission, L.P. (Company) and ENERGAS Company, A
division of Atmos Energy Corporation (Customer) agreed to this Service Order
pursuant to the terms of that Service Agreement effective January 1, 2002,
between Company and Customer.

Type of Service:
Transportation Period:
Maximum Daily Receipt Quantity:
Maximum Daily Delivery Quantity:
Maximum Monthly Receipt Quantity:
Maximum Monthly Delivery Quantity:
Maximum Annual Receipt Quantity:
Maximum Annual Delivery Quantity:
Demand Quantity:
Monthly Commodity Charge:
Monthly Demand Rate:
Month of delivery)
Fuel and Use Quantity:
Point(s) of Receipt:
Point(s) of Delivery:
Other Conditions:

ENERGAS COMPANY                    ONEOK WesTex Transmission, L.P. division
of Atmos Energy Corporation        By: ONEOK WesTex Gas Pipeline, Inc.
                                   General Partner

By:     SAMPLE-NO SIGNATURE        By:   SAMPLE-NO SIGNATURE

Name:        SAMPLE N/A                     John L. Sommer

Title:       SAMPLE N/A                     Vice President

Date:        SAMPLE N/A

<PAGE>

                                    EXHIBIT B

<Table>
<Caption>

FACILITY DATA                    DATA DEFINITION                       REMARKS
-------------                    ---------------                       -------
<S>                             <C>                             <C>
FACILITY NAME
METER TYPE
OPERATOR
3RD PARTY
CAPACITY
STATE
COUNTY
SECTION
TOWNSHIP/BLOCK
RANGE/SURVEY
SYSTEM NUMBER
I.D. DATE
ASSOCIATED CONTRACT
COMMENTS
</Table>

<PAGE>

                                    EXHIBIT C
                                     ENERGAS

Location Name:
Technician:
Energas Premise Number:
ONEOK Account Number:

Pipeline Number:
System Number:
Meter Size:
Meter S/N:
--------------------------------------------------------------------------------
P.D. METER PRESSURE CHANGE

Type of Instrument:    VTC ____   FF ____  PCI ____ Gauge ____ Oz. ___ Chart ___
Meter Reading:
Pressure Changed From:
Pressure Changed To:
--------------------------------------------------------------------------------
INDEX CHANGE

Old Index Reading:
New Index Reading:
--------------------------------------------------------------------------------
POSITIVE METER CHANGE OUT

Old Meter Serial No.: _________________ Size: __________  Code: _____________
Out Reading:

New Meter Serial No.: _________________  Size: __________  Code: _____________
In Reading:
--------------------------------------------------------------------------------
Pressure Base:
Pressure:
Local Atmospheric Pressure _________  Latitude: _________ Longitude: ___________
--------------------------------------------------------------------------------
Whom Notified:                                                Notified By:
Date Notified:                                                Time Notified:
Date Completed:                                               Time Completed:
Current Date:
--------------------------------------------------------------------------------
Remarks:

--------------------------------------------------------------------------------
CC: Jamie Luckett, ONEOK - Lubbock
    Lubbock Measurement - Tina Fowler, Energas - Lubbock

                                       30

<PAGE>

                                                          Agreement No .27657-FT

                                   EXHIBIT A-4

                              TO SERVICE AGREEMENT
                                     BETWEEN
                         ONEOK WESTEX TRANSMISSION, L.P.
                                       AND
                         ENERGAS COMPANY, A DIVISION OF
                            ATMOS ENERGY CORPORATION

                      Transportation for Large Volume Sales

                                  SERVICE ORDER

        ONEOK WesTex Transmission, L.P. (Company) and ENERGAS Company, a
division of Atmos Energy Corporation (Customer) agreed to this Service Order
pursuant to the terms of that Service Agreement effective January 1, 2002,
between Company and Customer.

Type of Service:                            Firm

Transportation Period:                      January 1, 2002 through March 31,
                                            2005 and year to year thereafter by
                                            either party with sixty (60) days
                                            advance written notice prior to
                                            March 31, 2005 or any anniversary
                                            thereof.

Maximum Daily Receipt Quantity:             N/A

Maximum Daily Delivery Quantity:            Up to 18,000 MMBtu per Day

Maximum Monthly Receipt Quantity:           N/A

Maximum Monthly Delivery Quantity:          N/A

Maximum Annual Receipt Quantity:            N/A

Maximum Annual Delivery Quantity:           N/A

Monthly Commodity Charge:                   (1) For the period commencing
                                            January 1, 2002 through December 31,
                                            2002, the rate shall be $0.14 per
                                            MMBtu times the actual MMBtu's of
                                            Gas delivered to Customer at the
                                            Point(s) of Delivery.

Fuel and Use Quantity:                      Customer will provide an in kind
                                            fuel reimbursement equal to one and
                                            one-quarter percent (1.25%) of the
                                            total quantity of Gas delivered at
                                            the Point(s) of Receipt. Possession
                                            and title of the fuel reimbursement
                                            Gas shall be transferred at the
                                            Point(s) of Receipt.

Point(s) of Receipt:                        Interconnection facilities of others
                                            with Company for the delivery of Gas
                                            to Company.

Point(s) of Delivery:                       All points of interconnection
                                            between Company and Customer where
                                            Customer receives Gas for delivery
                                            to Customer's large volume
                                            industrial customers.

Other Conditions:                           See Schedule A-4 attached hereto and
                                            by this reference included herein.

<PAGE>

ENERGAS Company, a division of              ONEOK WesTex Transmission, L.P.
Atmos Corporation                           By: ONEOK WesTex Pipeline, Inc.
                                            General Partner

By: /s/ Gordon J. Roy                       By: /s/ John L. Sommer
Name:  Gordon J. Roy                                John L. Sommer
Title:   Vice President                             Vice President

<PAGE>

                                  SCHEDULE A-4

I.       Definitions

         (a)      "Industrial Customers" shall mean those customers shown on
                  List #1 attached to this Schedule A-4.

         (b)      "Industrial Load" shall mean the volumes of Gas delivered to
                  Customer for delivery to the Industrial Customers.

II.      Industrial Load

         (a)      Customer nominations

                  (1)     Customer will nominate the supplies of gas into
                          Company and deliveries of gas from Company on or
                          before 11:45 A.M. of the Day preceding the Day on
                          which gas is to flow such that supplies match the
                          Customer s nominations on a daily basis, provided that
                          with respect to weekends the nomination shall be
                          provided to Company on or before 11:45 A.M. of the Day
                          before the weekend which is not a holiday; and
                          provided further that with respect to holidays the
                          nomination shall be provided to Company on or before
                          11:45 A.M. of the Day before the holiday which Day is
                          not a weekend or holiday.

                  (2)      Both Parties acknowledge that the Industrial Load can
                           change at any time, at which time Company may require
                           Customer, as discussed via telephone and confirmed in
                           writing, via fax or other electronic means, to make
                           intraDay nominations and either (A) deliver such
                           additional gas as Company may request for such gas
                           Day or next gas Day or (B) reduce deliveries to
                           Company, in such amount as requested by Company for
                           such gas Day. Customer must use its best efforts to
                           comply with such intra-Day nomination request and
                           delivery or reduce supplies to Company. Company shall
                           not request Customer to make intra-Day nominations
                           and adjust deliveries in excess of thirty percent
                           (30%) of the flowing industrial volumes for such gas
                           Day.

                  (3)      Delivery nominations will be made for all of the
                           Industrial Load directly connected to Company's
                           system.

                  (4)      Supply nominations will be by Point(s) of Receipt.

         (b)      Imbalances

If actual receipts of gas at the Point(s) of Receipt nominated and scheduled for
the Industrial Customers in any given month are different than the actual
deliveries of Gas to the Industrial Customers, then any such imbalance shall be
eliminated by in-kind balancing within sixty (60) days after the date of the
invoice which initially documents such imbalance.

<PAGE>

                                        2

SCHEDULE A-4

                                     List #1
                              Industrial Customers

<Table>
<Caption>

                   Name                                                         TBS or Direct Connect(DC)

<S>                                                                             <C>
WEYERHAUSER                                                                                   TBS
CROUSE-HINDS                                                                                  TBS
VALLEY PROTEIN                                                                                TBS
FARMLAND                                                                                      TBS
LAMESA COTTON OIL                                                                             TBS
WOOLAM GIN WEST                                                                               TBS
COVENANT LAKESIDE IMAGING                                                                     TBS
COVENANT LAKESIDE HOSPITAL                                                                    TBS
COVENANT LAKESIDE PLAZA                                                                       TBS
COVENANT LAKESIDE PLACE                                                                       TBS
COVENANT- 075-2466647                                                                         TBS
NURSING SCHOOL - 101-3922311                                                                  TBS
COV. MEDICAL CTR. - 007-0021120                                                               TBS
DOCTOR'S LOUNGE - 077-1564044                                                                 TBS
DAYCARE - 055-5002911                                                                         TBS
PHYS.PLANT - 053-0012526                                                                      TBS
E.PARKING GARAGE - 039-5452235                                                                TBS
W PARKING GARAGE - 039-5440018                                                                TBS
WEST TEXAS VA HEALTHCARE                                                                      TBS
PENATEK                                                                                       TBS
SHE RLEY ANDERSON GRAIN                                                                       TBS
SHERLEY ANDERSON GRAIN                                                                        TBS
SHERLEY ANDERSON GRAIN                                                                        TBS
TEXAS SESAME- #1                                                                              TBS
TEXAS SESAME- #2                                                                              TBS
TEXAS SESAME- #3                                                                              TBS
TEXAS SESAME- #4                                                                              TBS
WESTERN CONTAINER                                                                             TBS
WESTERN CONTAINER                                                                             TBS
KOCH MATERIALS                                                                                TBS
KOCH MATERIALS                                                                                TBS
ENTERRA HARRISBURG- WOOLEY                                                                    TBS
DELEON PEANUT - LAMESA                                                                        T8S
AGRI FARM #4                                                                                  TBS
AGRI FARM #5                                                                                  TBS
AGRI FARM #6                                                                                  TBS
AGRI FARM- TULIA                                                                              TBS
WEST TEXAS PEANUT                                                                             TBS
MEADOW FARMERS COOP                                                                           TBS
TERRY COUNTY COOP GIN                                                                         TBS
BIRDSONG - BROWN FIELD                                                                        TBS
</Table>

<PAGE>

                                        3

<Table>

<S>                                                                                     <C>
LOOP COOP GIN                                                                                 TBS
Hi Pro Feeds                                                                                  TBS
Gaines Co Farm Supply                                                                         DC
Continental Sulphur - Odessa                                                                  DC
DeLeon Peanut - B'FIELD                                                                       DC
Minza Southwest                                                                               DC
Debruce Grain                                                                                 DC
Zipp Industries                                                                               DC
Sherley Anderson Grain                                                                        DC
AGRI FARM -#2                                                                                 DC
AGRI FARM-GROWERS                                                                             DC
AGRI FARM - PLAINVIEW                                                                         DC
Olton Grain COOP                                                                              DC
Amoco Prod. - Cedar Lake                                                                      DC
Martin Resources                                                                              DC
DeLeon Peanut - Seminole                                                                      DC
Lakeview Gin - Tulia                                                                          DC
TDCJ- Lamesa                                                                                  DC
United Farm IND                                                                               DC
United Farm Edmonson                                                                          DC
Union Coop Gin                                                                                DC
Union Coop Gin                                                                                DC
Hereford Bi-Products                                                                          DC
Farstad Oil                                                                                   DC
AMF Vetco                                                                                     DC
Windham Gin                                                                                    DC
Sherley Anderson Grain                                                                         DC
Amoco Production - Spade                                                                       DC
Texas Sesame - Earth                                                                           DC
T.D.C.J.-Lub. Trusty Unit                                                                      DC
T.D.C.J.-Lub. Psychiatric                                                                      DC
Edmonson Wheat Growers                                                                         DC
Edmonson Wheat Growers                                                                         DC
Edmonson Wheat Growers                                                                         DC
Windstar, Inc.                                                                                 DC
Farmers Tuco Gin/ Edcot                                                                        DC
Owens Coop Gin                                                                                 DC
</Table>

<PAGE>

                                        4

<Table>

<S>                                                                                     <C>
Owens Coop Gin                                                                                 DC
Owens Coop Gin                                                                                 DC
WEST TEXAS PEANUT                                                                              DC
AGRI FARM- FLAGG                                                                               DC
Fourway Gin                                                                                    DC
Gaines Farm Supply-west                                                                        DC
Ten Hi Gin                                                                                     DC
Fiber Tex Gin                                                                                  DC
New Tex Gin                                                                                    DC
Tule Creek Gin                                                                                 DC
Parmer County Cotton Growers                                                                   DC
Parmer County Cotton Growers                                                                   DC
United Cotton Growers                                                                          DC
Birdsong - Seminole                                                                            DC
United Farm #194                                                                               DC
DEAF SMITH FEEDYARD                                                                            DC
DEAF SMITH FEEDYARD                                                                            DC
KIRKLAND CATTLE                                                                                DC
SUGARLAND FEEDYARD                                                                             DC
BEEFTECH CATTLE FEEDERS                                                                        DC
BEEFTECH CATTLE FEEDERS                                                                        DC
BEEFTECH CATTLE FEEDERS                                                                        DC
BEEFTECH CATTLE FEEDERS                                                                        DC
CAVINESS PACKING CO                                                                            DC
BARRETT & CROFOOT E                                                                            DC
DAWN FEEDYARD                                                                                  DC
DAWN FEEDYARD                                                                                  DC
XCL FEEDERS                                                                                    DC
C M CATTLE - FORMERLY FRIO                                                                     DC
BARRETT & CROFOOT W                                                                            DC
FRIONA FEEDERS                                                                                 DC
PACO                                                                                           DC
CONAGRA CATTLE / ASSO.                                                                         DC
CONAGRA CATTLE / ASSO.                                                                         DC
A2 CATTLE FEEDING                                                                              DC
RAFTER 3 FEEDYARD                                                                              DC
BUD HILL FEEDLOT                                                                               DC
BEEFCO FEEDERS                                                                                 DC
SLASH 0 (FORMERLY SMITH)                                                                       DC
CLUCK CATTLE CO. - MILL                                                                        DC
NUTT FEEDYARD                                                                                  DC
LONE STAR FEEDYARD                                                                             DC
LONE STAR FEEDYARD                                                                             DC
</Table>

<PAGE>

                                        5

<Table>

<S>                                                                                     <C>
LONE STAR FEEDYARD                                                                             DC
RANDALL COUNTY FEEDYARD                                                                        DC
SWISHER CATTLE CO                                                                              DC
PRAIRIE CATTLE                                                                                 DC
TULIA FEEDLOTS                                                                                 DC
C-BAR FEEDYARD                                                                                 DC
HALE CENTER FEEDYARD                                                                           DC
HILL FARM FEEDLOT                                                                              DC
SHEPARD FEED LOT I HALE CO.                                                                    DC
CAPROCK INDUSTRIES                                                                             DC
LITTLEFIELD FDYARD / FRIONA LAD.                                                               DC
LITTLEFIELD FDYARD / FRIONA LAD.                                                               DC
BOVINA FEEDERS                                                                                 DC
XVES-TEX FEEDYARDS                                                                             DC
CATTLEMENS I OLTON                                                                             DC
CARSON CO FEEDLOT                                                                              DC
GODHOLD FEEDS                                                                                  DC
TEXZONA CUSTOM- SMYER                                                                          DC
</Table>

<PAGE>

                                   EXHIBIT A-3
                              TO SERVICE AGREEMENT
                                     BETWEEN
                         ONEOK WESTEX TRANSMISSION, L.P.
                                       AND
                         ENERGAS COMPANY, A DIVISION OF
                            ATMOS ENERGY CORPORATION

                              IRRIGATION TRANSPORT

                                  SERVICE ORDER

        ONEOK WesTex Transmission, L.P. (Company) and ENERGAS Company, a
division of Atmos Energy Corporation (Customer) agreed to this Service Order
pursuant to the terms of that Service Agreement effective January 1, 2002,
between Company and Customer.

Type of Service:                            Firm

Transportation Period:                      January 1, 2002 through December 31,
                                            2004 and year to year thereafter
                                            until terminated by either party
                                            with sixty (60) days advance written
                                            notice prior to December 31, 2004 or
                                            any anniversary thereof.

Maximum Daily Receipt Quantity:             N/A

Maximum Daily Delivery Quantity:            Up to 15,000 MMBtu per Day

Maximum Monthly Receipt Quantity:           N/A

Maximum Monthly Delivery Quantity:          N/A

Maximum Annual Receipt Quantity:            N/A

Maximum Annual Delivery Quantity:           N/A

Monthly Commodity Charge:                   $0.2858 per MMBtu times the actual
                                            MMBtu's of Gas delivered to Customer
                                            at the Point(s) of Delivery
                                            excluding storage injections and
                                            withdrawals.

Fuel and Use Quantity:                      Customer will provide an in kind
                                            fuel reimbursement equal to one and
                                            one-quarter percent (1.25%) of the
                                            total quantity of Gas delivered at
                                            the Point(s) of Receipt. Possession
                                            and title of the fuel reimbursement
                                            Gas shall be transferred at the
                                            Point(s) of Receipt. Fuel
                                            reimbursement excludes storage
                                            injections and withdrawals.

Point(s) of Receipt:                        Interconnection facilities of others
                                            with Company for the delivery of Gas
                                            to Company including storage
                                            facilities of ONEOK Texas Gas
                                            Storage, L.P. pursuant to the
                                            Storage Agreement.

Point(s) of Delivery:                       All points of interconnection
                                            between Company and Customer where
                                            Customer receives delivery of Gas
                                            from Company for delivery to
                                            Customer's irrigation customers
                                            including storage facilities of
                                            ONEOK Texas Gas Storage, L.P.
                                            pursuant to the Storage Agreement.

Other Conditions:                           See Schedule A-3 attached hereto and
                                            by this reference included herein.

<PAGE>

ENERGAS Company, a division of          ONEOK WesTex Transmission, L.P.
Atmos Corporation                       By: ONEOK WesTex Pipeline, Inc.
                                        General Partner

By:  /s/ Gordon J. Roy                  By: /s/ John L. Sommer
Name:    Gordon J. Roy                          John L. Sommer
Title:   Vice President                         Vice President

<PAGE>

                                  SCHEDULE A-3

Definitions

         (a)      "All Other Areas" shall mean the areas of Company's pipeline
                  not included in the Triangle Area defined below.

         (b)      "Irrigation Load" shall mean volumes delivered by Company for
                  delivery to Customer's irrigation customers.

         (c)      "Line Segments" shall mean the sections of Company's pipeline
                  shown on Map #3 attached to this Schedule A-3 and included
                  herein and identified by line numbers 5,6,8,23,26,
                  27,28,53,54, and 58.

         (d)      "RSE" shall mean the revised Scada estimate which shall be
                  made.

         (e)      "Scada" shall mean Supervisory Control and Data Acquisition
                  system of Company.

         (f)      "Scada estimates" shall mean twenty-four (24) hour accumulated
                  volumes from the Supervisory Control and Data Acquisition
                  system.

         (g)      "Triangle Area" shall mean the geographical area served from
                  the Line Segments.

         (h)      Triangle Area Supply Points shall be those Point(s) of Receipt
                  shown on List #6 attached to Schedule A-1 of Exhibit A-1
                  attached to the Service Agreement.

II. Irrigation Load

         (a)      Customer's requirements for forecasting Irrigation Load and
                  for nominations

                  (1)     The forecasted Irrigation Load will be calculated by
                          Customer and provided to Company on or before 8:00
                          A.M. of the Day before the Day on which gas is to flow
                          provided that with respect to weekends the Irrigation
                          Load forecast shall be provided to Company on or
                          before 8:00 A.M. of the Day before the weekend which
                          is not a holiday; and provided further that with
                          respect to holidays the Irrigation Load forecast shall
                          be provided to Company on or before 8:00 A.M. of the
                          Day before the holiday which Day is not a weekend or
                          holiday. Company shall also prepare a Irrigation Load
                          forecast and Customer and Company shall compare each
                          of their respective Irrigation Load forecasts for each
                          gas Day and shall attempt to agree to an Irrigation
                          Load forecast.

                          (A)      Should the Parties agree to an Irrigation
                                   Load forecast, then the agreed upon
                                   Irrigation Load forecast shall be equal to
                                   the daily nomination for gas deliveries to
                                   satisfy such Load in full, adjusted for any
                                   confirmed makeup or intra-Day nominations.

<PAGE>

                                        2

                          (B)      In the event the parties cannot agree as to
                                   the Irrigation Load forecast, then Customer
                                   shall nominate to Company such Gas as it
                                   deems appropriate for the Irrigation Load.

                  (2)     Customer will nominate the delivery of supplies into
                          and deliveries from Company on or before 11:45 A.M of
                          the Day preceding the Day on which gas is to flow such
                          that supplies match the Customer's nominations on a
                          daily basis, except that with respect to weekends and
                          holidays, nominations need to be made on or before
                          11:45 A.M. of the Day before the weekend or holiday
                          described in Section II (a)(1) above.

                  (3)     Both Parties acknowledge that the Irrigation Load
                          forecast can change at any time, at which time Company
                          and Customer will discuss what action, if any, should
                          be taken, including withdrawal of gas from or
                          injection of gas into storage or additional or reduced
                          gas supply from third parties. If the parties agree as
                          to the action to be taken, then Customer, as discussed
                          via telephone and confirmed in writing, via fax or
                          other electronic means, will make intra-Day
                          nominations and either (A) deliver such additional gas
                          as Company may request for such gas Day or next gas
                          Day or (B) reduce deliveries to Company, in such
                          amount as requested by Company for such gas Day or (c)
                          inject gas into or withdraw gas from Storage as
                          allowed by and pursuant to the Storage Agreement.
                          Customer must use its best efforts to comply with such
                          intra-Day nomination request and deliver or reduce
                          supplies to Company. Company shall not request
                          Customer to make intra-Day nominations and adjust
                          deliveries in excess of thirty percent (30%) of the
                          flowing irrigation volumes for such gas Day. If the
                          parties disagree, then Customer will take such action
                          as it deems necessary for the Irrigation Load.

                  (4)     Delivery Nominations will be made as follows:

                          (A)      Triangle Area

                          (B)      All Other Areas

                  (5)     Supply nominations will be by Point(s) of Receipt and
                          will be made as follows:

                          (A)      Triangle Area supplies -- (Supply from the
                                   Triangle Area Supply Points must provide on a
                                   daily basis 35% of the Triangle Area
                                   forecasted and nominated deliveries for the
                                   months March through the next following
                                   September.)

                          (B)      All other supplies

                          (C)      Storage will only be considered as supply for
                                   the Triangle Area only after the above supply
                                   requirements have been satisfied for such
                                   area.

<PAGE>

                                       3

         (b)      Scada Estimates and RSE

                  Company requirements for reporting Scada estimates and RSE
                  volumes

                  (1)     The RSE Volumes for the Irrigation Load will be
                          reported by the Company by the following two areas:

                          (A)      Triangle Area

                          (B)      All Other Areas

                  (2)     The Scada estimates and RSE volumes for the Irrigation
                          Load for each area described immediately above will be
                          provided to Customer as described below and will be
                          calculated as follows:

                          (A)      Sum of receipts into each Line Segment that
                                   are available by daily collected BEM
                                   readings.

                          (B)      Less the Non-Customer deliveries that are
                                   available by daily collected EFM readings.

                          (C)      Less the estimated Non-Customer deliveries
                                   that are not available by daily collected BEM
                                   readings.

                          (D)      Less the estimated Customer LDC volumes for
                                   each Line Segment.

                          (E)      Plus or minus the change in line pack.

                  (3)     Company shall provide the Scada estimate of the
                          Irrigation Load for such gas Day to Customer on or
                          before 12:00 noon following the end of a gas Day.

                  (4)     Company shall provide the RSE for the Irrigation Load
                          to Customer on or before 12:00 noon on the second Day
                          following the gas Day.

         (c)      Imbalances.

                  (1)     If the Company and the Customer have agreed to the
                          Irrigation Load forecast for a Day of a Month and have
                          agreed for such Day as to any intra-Day nominations to
                          be omitted or made for such Day, as appropriate, then
                          there shall be no Daily Cashout pursuant to Section
                          11(d) below and any imbalance will be handled pursuant
                          to Section 11(e) of this Schedule A-3.

                  (2)     If the Company and Customer have agreed to the
                          Irrigation Load forecast for a Day but have not agreed
                          as to any intra-Day nominations to be omitted or made
                          for such Day, then on a daily basis, any imbalance
                          between the actual deliveries to the Company at the
                          Point(s) of Receipt for

<PAGE>

                                       4

                          the Irrigation Load and the RSE for such Day in excess
                          of five percent (5%) of the RSE for that Day shall
                          automatically be reduced by delivering gas into or
                          withdrawing gas from storage pursuant to and only as
                          allowed by the Storage Agreement for such Day. If
                          after such automatic balancing the imbalance still
                          exceeds five percent (5%) of the RSE for that Day,
                          then to the extent storage is available as determined
                          by Company in its sole discretion such excess shall be
                          deemed to be an overrun delivery into or withdrawal
                          from storage pursuant to the Storage Agreement and
                          Customer shall pay to Company any overrun fee imposed
                          by the Storage Agreement. If storage is not available,
                          then Customer shall be subject to the requirements
                          described in Section 11(d) below.

                  (3)     When there is no agreement between Company and
                          Customer as to the Irrigation Load forecast for a Day
                          during a Month but Company and Customer have agreed as
                          to any intra-Day nominations to be omitted or made for
                          such Day, then for such Day there shall be no Daily
                          Cashout thereof pursuant to Sections II(d) below and
                          any imbalance will be handled pursuant to Section
                          II(e) below.

                  (4)     If the Company and Customer have not agreed as to the
                          Irrigation Load Forecast for a Day and have not agreed
                          as to any intra-Day nominations for such Day, then on
                          a daily basis any imbalance between the actual
                          deliveries to the Company at the Point(s) of Receipt
                          for the Irrigation Load and the RSE for such Day in
                          excess of five percent (5%) of the RSE for that Day
                          shall automatically be reduced by delivering into or
                          withdrawing from storage pursuant to and only as
                          allowed by the Storage Agreement for such Day. If
                          after such automatic balancing the imbalance still
                          exceeds five percent (5%) of the RSE for that Day,
                          then Customer shall be subject to the requirements
                          described in Section II(d) below.

         (d)      Daily Cashout.

                  (1)     If nominations of gas as actually scheduled at the
                          Point(s) of Receipt for the Irrigation Load on any
                          given Day exceed the sum of the RSE and any intra-Day
                          adjustments requested by Company and provided by
                          Customer on such Day (Imbalance Day) by greater than
                          five percent (50 O), Company shall purchase from
                          Customer (on an MMBtu basis) any gas volumes in excess
                          of five percent (5%) on that Imbalance Day at a rate
                          equivalent to ninety percent (90%) of the published
                          price shown for the Day that the RSE for such
                          Imbalance Day is communicated to Customer in the
                          publication, Gas Daily, as found in the chart entitled
                          "Daily Price Survey," under the column entitled
                          "Midpoint" for the Permian Basin Area for "Texas
                          intras, Waha Area."

                  (2)     If the sum of the RSE and any intra-Day adjustments
                          requested by Company and provided by Customer on any
                          given Day exceeds the nominations of gas as actually
                          scheduled at the Point(s) of Receipt for the
                          Irrigation Load on such Day by greater than five
                          percent (5%), Customer shall purchase from Company (on
                          an MMBtu basis) any gas volumes in excess of five
                          percent (5%) on that Imbalance Day at a rate
                          equivalent to the published price shown for the Day
                          that the RSE for such Imbalance Day is communicated to
                          Customer in the publication. Gas Daily, as found

<PAGE>

                                       5

                          in the chart entitled "Daily Price Survey," under the
                          column entitled "Midpoint" for the Permian Basin Area
                          for "Texas intras, Waha area" times one hundred ten
                          percent (110%).

         (e)      In-kind Balancing.

                  At the end of each month and after taking into account the
                  buying and selling of gas pursuant to Sections II(d) above, if
                  there is any monthly imbalance between Company and Customer
                  (including, without limitation, any imbalances within the five
                  percent (5%) tolerance described above), it shall be
                  eliminated by in-kind balancing within sixty (60) days after
                  the date of the invoice which initially documents such
                  imbalance.

         (f)      Payment.

                  With respect to any imbalance payment due, if due by Company,
                  it shall be paid by Company within thirty (30) days after the
                  Company notifies Customer of such imbalance; and if due by
                  Customer, it shall be paid by Customer within thirty (30) Days
                  of receipt of invoice from Company of such imbalance.

<PAGE>
                                   EXHIBIT A-2
                              TO SERVICE AGREEMENT
                                     BETWEEN
                         ONEOK WESTEX TRANSMISSION, L.P.
                                       AND
                         ENERGAS COMPANY, A DIVISION OF
                            ATMOS ENERGY CORPORATION

                                  LDC Amarillo

                                  SERVICE ORDER

         ONEOK WesTex Transmission, L.P. (Company) and ENERGAS Company, a
division of Atmos Energy Corporation (Customer) agreed to this Service Order
pursuant to the terms of that Service Agreement effective January 1, 2002,
between Company and Customer.

Type of Service:                            Firm

Transportation Period:                      January 1, 2002 through March 31,
                                            2005, and year to year thereafter
                                            until terminated by either party
                                            with sixty (60) days advance written
                                            notice prior to March, 2005 or any
                                            anniversary thereof.

Maximum Daily Receipt Quantity:             N/A

Maximum Daily Delivery Quantity:            Winter Period - Not in excess of
                                            pipeline capacity at MAOP at the
                                            Point(s) of Delivery
                                            Summer Period - Not in excess of
                                            pipeline capacity at NAOP at the
                                            Point(s) of Delivery

Maximum Monthly Receipt Quantity:           N/A

Maximum Monthly Delivery Quantity:          N/A

Maximum Annual Receipt Quantity:            N/A

Maximum Annual Delivery Quantity:           N/A

Demand Quantity:                            N/A

Monthly Commodity Charge:                   $0.05 per MMBtu times the actual
                                            quantity of Gas delivered to
                                            Customer at the Point(s) of Delivery
                                            shown on List #1 attached to
                                            Schedule A-2.

Monthly Demand Rate:                        N/A

Fuel and Use Quantity:                      Customer will provide an in kind
                                            fuel reimbursement equal to one and
                                            one-quarter percent (1.25%) of the
                                            total quantity of Gas delivered at
                                            the Point(s) of Receipt. Possession
                                            and title of the fuel reimbursement
                                            Gas shall be transferred at the
                                            Point(s) of Receipt.

Point(s) of Receipt:                        Interconnection facilities of others
                                            with Company for the delivery of Gas
                                            to Company.

Point(s) of Delivery:                       All pints of interconnection between
                                            Company and Customer shown on List
                                            #1 attached to Schedule A-2.

Other Conditions:                           See Schedule A-2 attached hereto and
                                            by this reference included herein.

<PAGE>

ENERGAS Company, a division
of Atmos Energy Corporation             ONEOK WESTEX TRANSMISSION, L.P.
                                        By: ONEOK WesTex Pipeline, Inc.
By:  /s/ Gordon J. Roy                  General Partner

Name:    Gordon J. Roy                  By: /s/ John L. Sommer
         Vice President
                                        John L. Sommer
                                        Vice President
          8-22-02
          -------
            [JS]

<PAGE>

                                  SCHEDULE A-2

DEFINITIONS

         (a)      "Amarillo Area" shall mean the geographical area served from
                  Point(s) of Delivery as detailed on List #1 attached to and
                  made a part of this Schedule A-2.

         (b)      "Amarillo Load" shall mean volumes delivered by Company to the
                  Point(s) of Delivery on List #1 attached to and made a part of
                  this Schedule A-2 for delivery to Customer's distribution
                  customers.

         (c)      "Amarillo Area Supply Points" shall mean those Points of
                  Receipt shown on List #2 attached to and made a part of this
                  Schedule A-2.

         (d)      "MAOP" shall mean the maximum allowable operating pressure for
                  a particular pipeline as it may change from time to time.

         (e)      "RSE" shall mean the revised Scada estimate which shall be
                  made.

         (f)      "Scada" shall mean Supervisory Control and Data Acquisition
                  system of Company.

         (g)      "Scada estimates" shall mean twenty-four (24) hour accumulated
                  volumes from the Supervisory Control and Data Acquisition
                  system.

         (h)      "TBS" shall mean the town border stations within an area.

II.      Amarillo Load

         (a)      Customer requirements for forecasting Amarillo Load and for
                  nominations

                  (1)      The forecasted Amarillo Load for the Company system
                           will be calculated by Customer and provided to
                           Company on or before 8:00 A.M. of the Day before the
                           Day on which gas is to flow provided that with
                           respect to weekends the Amarillo Load forecast shall
                           be provided to Company on or before 8:00 A.M. of the
                           Day before the weekend which is not a holiday; and
                           provided further that with respect to holidays the
                           Amarillo Load forecast shall be provided to Company
                           on or before 8:00 A.M. of the Day before the holiday
                           which Day is not a weekend or holiday. Company shall
                           also prepare a Amarillo Load forecast and Customer
                           and Company shall compare each of their respective
                           Amarillo Load forecasts for each gas Day and shall
                           attempt to agree to an Amarillo Load forecast.

                           (A)     Should the Parties agree to an Amarillo Load
                                   forecast, then the agreed upon load forecast
                                   shall be equal to the daily nomination for
                                   gas

<PAGE>

                                   deliveries to satisfy such Load in full,
                                   adjusted for any confirmed makeup or intra
                                   Day nominations.

                           (B)     In the event the parties cannot agree as to
                                   the Amarillo Load forecast, then Customer
                                   shall nominate to Company such Gas as it
                                   deems appropriate for the Amarillo Load.

                  (2)      Customer will nominate the supplies of gas into
                           Company and deliveries of gas from Company on or
                           before 11:45 A.M. of the Day preceding the Day on
                           which gas is to flow such that supplies match the
                           Customer's nominations on a daily basis, except that
                           with respect to weekends and holidays, nominations
                           need to be made on or before 11:45 A.M. of the Day
                           before the weekend or holiday described in Section
                           II(a)( 1) above.

                  (3)      Both Parties acknowledge that the Amarillo Load
                           forecast can change at any time, at which time
                           Company may request Customer, as discussed via
                           telephone and confirmed in writing, via fax or other
                           electronic means, to make intra-Day nominations and
                           either (A) deliver such additional gas as Company may
                           request for such gas Day or next gas Day or (B)
                           reduce deliveries to Company, in such amount as
                           requested by Company for such gas Day. Customer must
                           use its best efforts to comply with such intraDay
                           nomination request and deliver or reduce the supplies
                           to Company. Company shall not request Customer to
                           make intra-Day nominations and adjust deliveries in
                           excess of thirty percent (30%) of the flowing
                           Amarillo volumes for such gas Day. However, with
                           respect to Saturdays, Sundays and holidays, when the
                           parties are in agreement as to an Amarillo Load
                           forecast, Customer will not be required to perform
                           intra-Day nomination and delivery changes for such
                           Saturdays, Sundays or holidays. If the parties are
                           not in agreement as to the Amarillo Load forecast for
                           a Saturday, Sunday or holiday, then Customer shall be
                           subject to making intra Day nominations and delivery
                           requirements as described above for such Days.

                  (4)      Delivery Nominations will be for the Amarillo Area.

                  (5)      Supply Nominations will be by Point(s) of Receipt
                           within the Amarillo Area and Amarillo Area Supply
                           Points must provide all of Amarillo Load
                           requirements.

         (b)      Scada Estimates and RSE

                  Company requirements for reporting Scada estimates and RSE
                  Volumes

                  (1)      The RSE volumes for the Amarillo Load will be
                           reported by Company by the Amarillo Area alone.

                  (2)      The RSE volumes for Amarillo Load will be provided to
                           Customer as described below and will be the sum of
                           all the Amarillo TBS volumes that are available by
                           daily collected EFM readings for the Amarillo Area.

<PAGE>

                  (3)      A Scada estimate of the Amarillo Load for each gas
                           Day will be communicated to Customer by 12:00 noon
                           following the end of each gas Day by fax, e-mail,
                           phone, or other electronic means that may be
                           available in the future.

                  (4)     The RSE volumes for Amarillo Area will be available
                          two working Days after the end of the gas Day by fax
                          or other electronic means that may be available in the
                          future. Once available, the RSE for Amarillo Load
                          based on the actual Amarillo volumes will be
                          calculated using the methodology described above and
                          communicated to Customer by 12:00 noon on the second
                          Day following the end of the gas Day by fax, e-mail,
                          phone, or other electronic means that may be available
                          in the future.

         (c)      Imbalances.

                  (1)     If the Company and the Customer have agreed to the
                          Amarillo Load forecast for every Day of a Month, then
                          there shall be no Daily Cashout pursuant to Section
                          II(d) below.

                  (2)      When there is no agreement between the Company and
                           Customer as to the Amarillo Load forecast for any and
                           all Days during a month, then for each such Day,
                           Customer nominations (as actually scheduled) for the
                           Amarillo Load on a daily basis to Company shall be
                           within the tolerances as described in Section II(d)
                           below when compared to the sum for such Day of (A)
                           the RSE and (B) any intra-Day delivery adjustments
                           requested by Company and provided by Customer. In the
                           event such nominations, as adjusted, are not within
                           the required tolerance, then Customer shall be
                           subject to the requirements described in Section
                           II(d) below.

         (d)      Daily Cashout

                  (1)     If nominations of gas as actually scheduled at the
                          Point(s) of Receipt for the Amarillo Load on any given
                          Day exceed the sum of Subsections II(c)(2)(A) and (B)
                          on such Day (Imbalance Day) by greater than five
                          percent (5%), Company shall purchase from Customer (on
                          an MMBtu basis) any gas volumes in excess of five
                          percent (5%) on that Imbalance Day at a rate
                          equivalent to ninety percent (90%) of the published
                          price shown for the Day that the RSE for such
                          Imbalance Day is communicated to Customer in the
                          publication, Gas Daily, as found in the chart entitled
                          "Daily Price Survey," under the column entitled
                          "Midpoint" for the Permian Basin Area for "Texas
                          intras, Waha Area."

                  (2)      If the sum of Subsections II(c)(2)(A) and (B) on any
                           given Day exceeds the nominations of gas as actually
                           scheduled at the Point(s) of Receipt for the Amarillo
                           Load on such Day (Imbalance Day) by greater than five
                           percent (5%), Customer shall purchase from Company
                           (on an MMBtu

<PAGE>

                          basis) any gas volumes in excess of five percent (5%)
                          on that Imbalance Day at a rate equivalent to the
                          published price shown for the Day that the RSE for
                          such Imbalance Day is communicated to Customer in the
                          publication, Gas Daily, as found in the chart entitled
                          "Daily Price Survey," under the column entitled
                          "Midpoint" for the Permian Basin Area for "Texas
                          intras, Waha area" times one hundred ten percent
                          (110%).

         (e)      In-kind Balancing

                  At the end of each month and after taking into account the
                  buying of gas pursuant to Section II(d) above, if there is any
                  monthly imbalance between Company and Customer (including
                  without limitation any imbalances within the five percent (5%)
                  tolerance described above), it shall be eliminated by in-kind
                  balancing at the direction and in accordance with the timing
                  specifications of Company within sixty (60) days after the
                  date of the invoice which initially documents such imbalance.

         (f)      Payment

                  With respect to any imbalance payment due, if due by Company,
                  it shall be paid by Company within thirty (30) days after the
                  Company notifies Customer of such imbalance; and if due by
                  Customer, it shall be paid by Customer within thirty (30) Days
                  of receipt of invoice from Company of such imbalance.

<PAGE>

                                  SCHEDULE A-2
                                     LIST #1
                                  Amarillo Area

<Table>
<Caption>

          STATION NAME                                        STATION #
<S>                                                              <C>
          AMARILLO CREEK TO ENERGAS                              036811
          AMARILLO TBS #5                                        480030
          AMARILLO EMER IP 5                                     481008
          OWT TO AMARILLO KALKA                                  482001
</Table>

<PAGE>

                                  SCHEDULE A-2
                                     LIST #2
                           Amarillo Area Supply Points

<Table>
<Caption>

STATION NAME                                           STATION #

<S>                                                    <C>
NGPL POTTER                                                11442
</Table>

<PAGE>

                                   EXHIBIT A-i
                              TO SERVICE AGREEMENT
                                     BETWEEN
                         ONEOK WESTEX TRANSMISSION, L.P.
                                       AND
                         ENERGAS COMPANY, A DIVISION OF
                            ATMOS ENERGY CORPORATION

                            LDC (Excluding Amarillo)

                                  SERVICE ORDER

         ONEOK WesTex Transmission, L.P. (Company) and ENERGAS Company, a
division of Atmos Energy Corporation (Customer) agreed to this Service Order
pursuant to the terms of that Service Agreement effective January 1, 2002,
between Company and Customer.

Type of Service:                            Firm

Transportation Period:                      January 1, 2002 through March 31,
                                            2005, and year to year thereafter
                                            until terminated by either party
                                            with sixty (60) days advance written
                                            notice prior to March, 2005 or any
                                            anniversary thereof.

Maximum Daily Receipt Quantity:             N/A

Maximum Daily Delivery Quantity:            Winter Period - (November-April)
                                            208,000 MMBtu per Day
                                            Summer Period - (May-October) 39,000
                                            MMBstu per Day

Maximum Monthly Receipt Quantity:           N/A

Maximum Monthly Delivery Quantity:          N/A

Maximum Annual Receipt Quantity:            N/A

Maximum Annual Delivery Quantity:           Winter Period - (November-April)
                                            37,648,000 MMBtu
                                            Summer Period - (May-October)
                                            7,176,000 MMBtu

Demand Quantity:                            Winter Period - (November-April)
                                            208,000 MMBtu per day
                                            Summer Period - (May-October) 39,000
                                            MMBtu per day

Monthly Commodity Charge:                   $0.02 per MMBtu times the actual
                                            quantity of Gas delivered to
                                            Customer at the Point(s) of Delivery
                                            excluding storage injections and
                                            withdrawals.

Monthly Demand Rate:
(to be paid in advance
of the Month of delivery)                   Winter Period - $0.07 times the
                                            Winter Period Demand Quantity times
                                            the number of Days in the respective
                                            Month of delivery.

Fuel and Use Quantity:                      Customer will provide an in kind
                                            fuel reimbursement equal to one and
                                            one-quarter percent (1.25%) of the
                                            total quantity of Gas delivered at
                                            the Point(s) of Receipt. Possession
                                            and title of the fuel reimbursement
                                            Gas shall be transferred at the
                                            Point(s) of Receipt. Fuel
                                            reimbursement excludes storage
                                            injections and withdrawals.

Point(s) of Receipt:                        Interconnection facilities of others
                                            with Company for the delivery of Gas
                                            to Company including storage
                                            facilities of ONEOK Texas Gas
                                            Storage, L.P. pursuant to the
                                            Storage Agreement.

Point(s) of Delivery:                       All pints of interconnection between
                                            Company and Customer where Customer
                                            receives Gas fom Company for

<PAGE>
                                            delivery to Customer's distribution
                                            customers including storage
                                            facilities of ONEOK Texas Gas
                                            Storage, L.P. pursuant to the
                                            Storage Agreement.

Other Conditions:                           See Schedule A-1 attached hereto and
                                            by this reference included herein.

ENERGAS COMPANY
a division of Atmos Energy Corporation      ONEOK WesTex Transmission, L.P.
                                            By: ONEOK WesTex Gas Pipeline, Inc.
By: /s/ Gordon J. Roy                       General Partner
Name: Gordon J. Roy                         By: /s/ John L. Sommer
Title:  Vice President                      John L. Sommer
Date: 8-22-02                               Vice President

<PAGE>

                                  SCHEDULE A-1

Definitions

         (a)      "All Other Areas" shall mean the geographical areas served
                  from the Point(s) of Delivery as detailed on List #1 attached
                  to and made a part of this Schedule A-1.

         (b)      "Amarillo Area" shall mean the geographical areas served from
                  the Point(s) of Delivery as detailed on List #2 attached to
                  and make a part of this Schedule A-1.

         (c)      "Amarillo Load" shall mean volumes delivered by Company to the
                  Point(s) of Delivery on List #2 attached to and made a part of
                  this Schedule A-1 for delivery to Customer's distribution
                  customers.

         (d)      "LDC" shall mean all of the local distribution facilities of
                  Customer separately defined as the Triangle Area, the North
                  End Area, and All Other Areas but specifically not including
                  the Amarillo Area.

         (e)      "LDC Load" shall mean volumes delivered by Company for
                  delivery to Customer's distribution customers excluding the
                  Amarillo Load.

         (f)      North End Area" shall mean the geographical areas served from
                  the Point(s) of Delivery as detailed on List #3 attached to
                  and made a part of this Schedule A-1.

         (g)      "North End Area Supply Points" shall be those Points(s) of
                  Receipt into the Company as shown on List #4 attached to and
                  made a part of this Schedule A-1.

         (h)      "RSE" shall mean the revised Scada estimate which shall be
                  made.

         (i)      "Scada" shall mean Supervisory Control and Data Acquisition
                  system of Company.

         (j)      "Scada Estimates" shall mean twenty-four (24) hour accumulated
                  volumes from the Supervisory Control and Data Acquisition
                  system.

         (k)      "TBS" shall mean the town border stations within an area.

         (1)      "Triangle Area" shall mean the Point(s) of Delivery as
                  detailed on List #5 attached to and made a part of this
                  Schedule A-1.

         (m)      "Triangle Area Supply Points" shall be those Point(s) of
                  Receipt shown on List #6 attached to and made a part of this
                  Schedule A-1.

<PAGE>

                                        2

II.      LDC Load

        (a)       Customer requirements for forecasting LDC Load and for
                  nominations

                  (1)      The forecasted LDC Load for the Company system will
                           be calculated by Customer and provided to Company on
                           or before 8:00 A.M. of the Day before the Day on
                           which gas is to flow provided that with respect to
                           weekends the LDC Load forecast shall be provided to
                           Company on or before 8:00 A.M. of the Day before the
                           weekend which is not a holiday; and provided further
                           that with respect to holidays the LDC Load forecast
                           shall be provided to Company on or before 8:00 A.M.
                           of the Day before the holiday which Day is not a
                           weekend or holiday. Company shall also prepare a LDC
                           Load forecast and Customer and Company shall compare
                           each of their respective LDC Load forecasts for each
                           gas Day and shall attempt to agree to a LDC Load
                           forecast.

                           (A)     Should the Parties agree to a LDC Load
                                   forecast, then the agreed upon LDC Load
                                   forecast shall be equal to the daily
                                   nomination for gas deliveries to satisfy such
                                   Load in full, adjusted for any confirmed
                                   makeup or intra-Day nominations.

                           (B)     In the event the parties cannot agree as to
                                   the LDC Load forecast, then Customer shall
                                   nominate to Company such Gas as it deems
                                   appropriate for the LDC Load.

                  (2)      Customer will nominate the supplies of gas into
                           Company and deliveries of gas from Company on or
                           before 11:45 A.M. of the Day preceding the Day on
                           which gas is to flow such that supplies of gas match
                           the Customer's nominations on a daily basis, except
                           that with respect to weekends and holidays,
                           nominations need to be made on or before 11:45 A.M.
                           of the Day before the weekend or holiday described in
                           Section II(a)(1) above.

                  (3)      Both Parties acknowledge that the LDC Load forecast
                           can change at any time, at which time Company may
                           request Customer, as discussed via telephone and
                           confirmed in writing, via fax or other electronic
                           means, to make intra-Day nominations and either (A)
                           deliver such additional gas as Company may request
                           for such gas Day or next gas Day or (B) reduce
                           deliveries to Company, in such amount as requested by
                           Company for such gas Day. Customer must use its best
                           efforts to comply with such intraDay nomination
                           request and deliver or reduce supplies to Company.
                           Company shall not request Customer to make intra-Day
                           nominations and adjust deliveries in excess of thirty
                           percent (30%) of the flowing LDC volumes for such gas
                           Day. However, with respect to Saturdays, Sundays and
                           holidays, when the parties are in agreement as to a
                           LDC Load forecast, Customer will not be required to
                           perform intraday nomination and delivery changes for
                           such Saturdays, Sundays or holidays. If the parties
                           are not in agreement as to the LDC Load forecast for
                           a Saturday,

<PAGE>

                                       3

                          Sunday or holiday, then Customer shall be subject to
                          making intra-Day nominations and delivery requirements
                          as described above for such Days.

                  (4)     Delivery nominations will be made as follows:

                          (A)      North End Area [Excluding Amarillo Area]

                          (B)      Triangle Area

                          (C)      All Other Areas

                  (5)     Supply nominations will be by Point(s) of Receipt
                          within the areas shown below and will be made as
                          follows:

                          (A)      North End Area supplies -- (Supply from the
                                   North End Area Supply Points must provide on
                                   a daily basis at least 55% of the North End
                                   Area nominated deliveries [excluding Amarillo
                                   Area] unless Customer is supplying 100% of
                                   the gas supply requirements for the Amarillo
                                   Area only from NGPL -- Potter North End
                                   Supply Point, in which case the 55%
                                   requirement is waived.)

                          (B)      Triangle Area supplies -- (Supply from
                                   Triangle Area Supply Points must provide on a
                                   daily basis at least 20% of the Triangle Area
                                   nominated deliveries for the months of
                                   November through March.)

                          (C)      All Other Area supplies

                          (D)      Storage will only be considered as supply for
                                   the North End and Triangle Areas only after
                                   the above supply requirements have been
                                   satisfied for such Areas.

        (b)       Scada Estimates and RSE

                  Company requirements for reporting Scada estimates and RSE
                  Volumes:

                  (1)     The RSE volumes for the LDC Load will be reported by
                          Company by the following three areas:

                          (A)     North End Area

                          (B)     Triangle Area

                          (C)     All Other Areas

                  (2)     The Scada estimates and RSE volumes for the LDC Load
                          for each area described immediately above will be
                          provided to Customer as described below and will be
                          calculated as follows:

<PAGE>
                                       4

                          (A)      Sum of all TBS volumes that are available by
                                   daily collected EFM readings for each area.

                          (B)      Less the nominations behind those TBS for
                                   Industrial Load as required pursuant to
                                   Section II of Schedule A-4 attached to
                                   Exhibit A-4 of the Service Agreement.

                          (C)      Plus an estimate for the remaining 15% of the
                                   TBS volume based on a proration of the daily
                                   collected EFM readings.

                          (D)      Plus an estimate of the rural system volumes
                                   for each area based on a proration of the
                                   daily collected EFM readings.

                  (3)     A Scada estimate of the LDC Load by area for each gas
                          Day will be communicated to Customer by 12:00 noon
                          following the end of each gas Day by fax, e-mail,
                          phone, or other electronic means that may be
                          available in the future.

                  (4)     The RSE volumes for the listed TBS's will be
                          available two working Days after the end of the gas
                          Day by fax or other electronic means that may be
                          available in the future. Once available, the RSE for
                          LDC Load based on the actual TBS volumes will be
                          calculated using the methodology described above and
                          communicated to Customer by 12:00 noon on the second
                          Day following the end of the gas Day by fax, e-mail,
                          phone, or other electronic means that may be
                          available in the future.

         (c)      Imbalances

                  (1)     If the Company and the Customer have agreed to the LDC
                          Load forecast for every Day of a Month, then there
                          shall be no Daily Cashout pursuant to Section 11(d)
                          below. On a daily basis any imbalance between the
                          actual deliveries to the Company at the Point(s) of
                          Receipt for the LDC Load and the RSE for such Day in
                          excess of five percent (5%) of the RSE for that Day,
                          shall automatically be reduced by delivering gas into
                          or withdrawing gas from storage pursuant to and only
                          as allowed by the Storage Agreement for such Day. If
                          after such automatic balancing the imbalance still
                          exceeds five percent (5%) of the RSE for that Day then
                          such excess shall also be deemed to be an overrun
                          delivery into or withdrawal from storage pursuant to
                          the Storage Agreement except that Customer shall not
                          pay to Company any overrun fee imposed by the Storage
                          Agreement.

                  (2)     When there is no agreement between Company and
                          Customer as to the LDC Load forecast for any or all
                          Days during a month, then for each such Day, Customer
                          nominations (as actually scheduled) for the LDC Load
                          on a daily basis to Company shall be within the
                          tolerance as described in Section 11(d) below when
                          compared to the sum for such Day of (A) the RSE and
                          (B) any intra-Day delivery adjustments requested by
                          Company and provided by Customer. On a daily basis any
                          imbalance between the actual deliveries to the Company
                          at the Point(s) of Receipt for the LDC Load and the
                          RSE for such Day in excess of five percent (5%) of the
                          RSE for that Day, shall automatically be reduced by
                          delivering gas into or

<PAGE>

                                        5

                          withdrawing gas from storage pursuant to and only as
                          allowed by the Storage Agreement for such Day. If
                          after such automatic balancing the imbalance still
                          exceeds five percent (5%) of the RSE for that Day then
                          (C) if allowed by Company in its sole discretion, such
                          excess may be injected into or withdrawn from storage
                          pursuant to and only as allowed by the Storage
                          Agreement as an overrun and Customer will pay for any
                          such overruns in accordance with the Storage
                          Agreement; or (D) if storage overrun is not available,
                          Customer shall be subject to the requirements
                          described in Section II(d) below.

         (d)      Daily Cashout

                  (1)     If nominations of gas as actually scheduled at the
                          Point(s) of Receipt for the LDC Load on any given Day
                          (Imbalance Day) exceed the sum of Subsections
                          II(c)(2)(A) and (B) on such Day by greater than five
                          percent (5%), Company shall purchase from Customer (on
                          an MMBtu basis) any gas volumes in excess of five
                          percent (5%) on that Imbalance Day at a rate
                          equivalent to ninety percent (90%) of the published
                          price shown for the Day that the RSE for such
                          Imbalance Day is communicated to Customer in the
                          publication, Gas Daily, as found in the chart entitled
                          "Daily Price Survey," under the column entitled
                          "Midpoint" for the Permian Basin Area for "Texas
                          intras, Waha Area."

                  (2)     If the sum of Subsections II (c)(2)(A) and (B) on any
                          given Day exceeds the nominations of gas as actually
                          scheduled at the Point(s) of Receipt for the LDC Load
                          on such Day (Imbalance Day) by greater than five
                          percent (5%), Customer shall purchase from Company (on
                          an MMBtu basis) any gas volumes in excess of five
                          percent (5%) on that Imbalance Day at a rate
                          equivalent to the published price shown for the Day
                          that the RSE for such Imbalance Day is communicated to
                          Customer in the publication, Gas Daily, as found in
                          the chart entitled "Daily Price Survey," under the
                          column entitled "Midpoint" for the Permian Basin Area
                          for "Texas intras, Waha area" times one hundred ten
                          percent (110%).

         (e)     In-kind Balancing

                  At the end of each month and after taking into account the
                  buying of gas pursuant to Sections II(d) above, if there is
                  any monthly imbalance between Company and Customer (including
                  without limitation any imbalances within the five percent (5%)
                  tolerance as described above), it shall be eliminated by
                  in-kind balancing within sixty (60) days after the date of the
                  invoice which initially documents such imbalance.

         (f)      Payment

                  With respect to any imbalance payment due, if due by Company,
                  it shall be paid by Company within thirty (30) days after the
                  Company notifies Customer of such

<PAGE>

                                        6

                  imbalance; and if due by Customer, it shall be paid by
                  Customer within thirty (30) Days of receipt of invoice from
                  Company of such imbalance.

         (g)      Right of First Refusal

                  If at the termination of the LDC transportation contract,
                  Company shall obtain a bona fide, executed written offer from
                  a responsible and ready, willing and able party to transport
                  gas on that part of Company's system which is used to serve
                  Customer's LDC transportation customers as shown on the list
                  provided below Company, without identifying the party
                  submitting such offer, shall submit an exact copy of such
                  offer to Customer. Customer shall have the right, exercisable
                  by written notice delivered to Company within thirty (30) days
                  from the date of delivery of an exact copy of such offer to
                  Customer, to enter into a transportation agreement with
                  Company for the price and on the same terms and conditions
                  contained in such offer. If Customer does not timely exercise
                  its right of first refusal, Company may complete the
                  transportation arrangement pursuant to and on the terms of
                  such third party offer and Customer shall no longer have any
                  right of first refusal pursuant to this Service Agreement.

         (h)      Reduction Rights

                  Should Company directly serve an LDC transportation customer
                  and Customer is no longer involved at all in delivering gas to
                  such transportation customer, then Company shall reduce the
                  Demand Quantity by the amount set opposite such transportation
                  customer's name on the list attached hereto as List A-5 to
                  this Schedule A- 1. Customer shall provide Company a list of
                  the LDC transportation customers and shall be attached hereto
                  as List A-5 to this Schedule A- 1. The maximum aggregate
                  reduction for all LDC transportation customers (under the
                  Agreement and all Exhibits and Schedules attached thereto)
                  shall be 208,000 MMBtu/day.

<PAGE>

                                        7

                                  SCHEDULE A-1
                                     LIST #1
                                 All Other Areas

<Table>
<Caption>

     STATION NAME                                        STATION #

<S>                                                         <C>
     BIG SPRING #3                                          480024
     SLATON TBS                                             480062
     SOUTHLAND TBS                                          480063
     POST TBS                                               480064
     O'DONNELL TBS                                          480067
     O'DONNELL TBS                                          480068
     LAMESATBS1                                             480069
     LAMESATBS1                                             480070
     ROPES TBS                                              480071
     MEADOWS TBS                                            480072
     STANTON TBS                                            480075
     STANTON TBS                                            480076
     WELCH TBS                                              480090
     WELLMANTBS                                             480098
     COAHOMATBS                                             480120
     COAHOMATBS                                             480121
     SEMINOLE TBS                                           480384
     SEMINOLE TBS                                           480385
     SEAGRAVES TBS                                          480391
     SEAGRAVES TBS                                          480392
     FORSAN TBS T.O.                                        480394
     BROWNFIELD TBS NO 1                                    481110
     BROWNFIELD TBS NO 2                                    481115
     LAMESATBSNO2                                           481180
     BIG SPRING TBS NO.1                                    481700
     BIG SPRING TBS NO.2                                    481705
     WELCH TBS SECONDARY                                    480101
</Table>

<PAGE>

                                        8

                                  SCHEDULE A-1
                                     LIST #2
                                  Amarillo Area

<Table>
<Caption>

           STATION NAME                                        STATION #
<S>                                                            <C>
           AMARILLO CREEK TO ENERGAS                              036811
           AMARILLO TBS #5                                        480030
           AMARILLO EMER IP 5                                     481008
           OWT TO AMARILLO KALKA                                  482001
</Table>

<PAGE>

                                        9

                                  SCHEDULE A-i
                                     LIST #3
                                 North End Area

<Table>
<Caption>

     STATION NAME                                        STATION #
<S>                                                      <C>
     PANHANDLE TBS #2                                       480026
     ENERGAS-FRITCH TBS #2                                  480032
     TANGLEWOOD TBS #1                                      480095
     TANGLEWOOD TBS #2                                      480096
     ENERGAS - SANFORD TBS                                  480724
     ENERGAS - FRITCH TBS #1                                480725
     CANYON TBS #2                                          480890
     CANYON TBS NO. 1                                       481120
     PANHANDLE TBS                                          481730
     PAMPA SOUTH TBS                                        481735
     PAMPA WEST TBS                                         481740
</Table>

<PAGE>

                                       10

                                  SCHEDULE A-i
                                     LIST #4
                             North End Supply Points

<Table>
<Caption>

      STATION NAME                                        STATION #
<S>                                                       <C>
      Pioneer! Fain Processing Plant                          36911
      NGPL/Potter                                             11442
      Trans WesternlCarson                                   103767
      NNG/Carson                                             103748
</Table>

<PAGE>

                                       11

                                  SCHEDULE A-i
                                     LIST #5
                                  Triangle Area

<Table>
<Caption>

         STATION NAME                                        STATION #
<S>                                                         <C>
         DAWN TBS                                               540900
         HEREFORD EMERGENCY T                                   480035
         DIMMITT TBS #3                                         480037
         HAPPY TBS                                              480038
         KRESS TBS                                              480039
         SILVERTON TBS                                          480044
         SILVERTON TBS                                          480045
         QUITAQUE TBS                                           480046
         TURKEY TBS                                             480047
         MULESHOE TBS #2                                        480048
         SUDAN TBS                                              480049
         SUDAN TBS                                              480050
         AMHERST TBS                                            480051
         AMHERST TBS                                            480052
         ANTON TBS                                              480053
         ANTON TBS                                              480054
         EARTH TBS                                              480055
         SHALLO WATER TBS                                       480058
         LORENZOTBS                                             480060
         LORENZOTBS                                             480061
         WILSON TBS                                             480065
         WILSON TBS                                             480066
         WHITHARRELL TBS                                        480080
         WOLFFORTH TBS                                          480081
         WOLFFORTH TBS                                          480082
         NEW DEAL TBS                                           480083
         SPRINGLAKETBS                                          480084
         SPRINGLAKE TBS                                         480085
         VEGA TBS                                               480086
         VEGA TBS                                               480087
         HART TBS #1                                            480088
         HART TBS #2                                            480089
         EDMONSON TBS                                           480091
         NEW HOMES TBS                                          480092
         NEW HOMES TBS                                          480093
         SMYER TBS                                              480094
         NAZARETH TBS                                           480097
         LAKE RANSON TBS #1                                     480099
         LAKE RANSON TBS #2                                     480100
         SMYER TBS #2                                           480102
</Table>

<PAGE>

                                       12

                                  SCHEDULE A-1
                                     LIST #5
                                  Triangle Area

<Table>
<Caption>

         STATION NAME                                        STATION #
<S>                                                             <C>
         FRIONA TBS - A                                         480382
         FRIONA TBS - B                                         480383
         HALE CENTER TBS                                        480386
         HALE CENTER TBS                                        480387
         LOCKNEYTBS                                             480388
         LOCKNEYTBS                                             480389
         LITTLEFIELD TBS #3                                     480397
         IDALOU T.B.S.                                          480402
         IDALOU T.B.S.                                          480403
         DIMMIT TBS #2                                          480540
         DIMMITT TBS #1                                         480553
         ENERGAS-FLOYDADA TBS                                   480562
         ENERGAS-RALLS TBS                                      480563
         ABERNATHY TBS                                          481100
         BOVINA TBS                                             481105
         CROSBYTON TBS                                          481130
         HEREFORD TBS NO.1                                      481165
         HEREFORDTBSNO2                                         481170
         LEVELLAND EMERG. TBS 1                                 481185
         LEVELLAND TBS #2                                       481190
         LITTLEFIELD TBS                                        481195
         LITTLEFIELD NO 2                                       481198
         MULESHOE TBS NO 1                                      481240
         OLTON TBS                                              481275
         PETERSBURG TBS                                         481280
         PLAINVIEWTBS NO. 1                                     481285
         PLAINVIEW TBS NO.2                                     481290
         PLAINVIEW TBS NO.4                                     481292
         TAHOKATBS                                              481325
         TULIA TBS NO. 1                                        481330
         TULIA TBS NO. 3                                        481340
         LUBBOCK NE TBS                                         481343
         LUBBOCK NW TBS                                         481344
         LUBBOCK SE TBS                                         481345
         LUBBOCK EAST TBS                                       481346
         PLAINVIEW TBS                                          480040
         BUFFALO SPRINGS TBS                                    542656
</Table>

<PAGE>

                                       13

                                  SCHEDULE A-1
                                     LIST #6
                           Triangle Area Supply Points

<Table>
<Caption>

         STATION NAME                                        STATION H
<S>                                                          <C>
         El Paso Natural Gas/Umbarger                           103809
         El Paso Natural Gas/Amherst                            103808
         NGPL/Bailey                                             11443
         NGPL/Deaf Smith                                         25026
         NNG/Hale                                               103762
         El Paso Natural Gas/DWSTRHRT                           315830
</Table><PAGE>
                                                                   EXHIBIT 10.16

                               PRECEDENT AGREEMENT

                          CORNERSTONE EXPANSION PROJECT

         THIS PRECEDENT AGREEMENT ("Precedent Agreement") is entered into this
16th day of April, 2002, by and between TRANSCONTINENTAL GAS PIPE LINE
CORPORATION ("Transco"), a Delaware corporation, and UNITED CITIES GAS COMPANY,
A DIVISION OF ATMOS ENERGY CORPORATION, ("Shipper"), a Texas and Virginia
corporation. Transco and Shipper are sometimes referred to individually as
"Party" and jointly as "Parties."

                                   WITNESSETH:

         WHEREAS, Shipper desires firm transportation service under Transco's
proposed Cornerstone Expansion Project ("Cornerstone") for 6,000 dekatherms of
gas per day ("dt/d") ("Contract Quantity") on Transco's mainline from the
receipt point(s) specified in Exhibit A hereto to the delivery point(s)
specified in Exhibit B hereto; and

         WHEREAS, subject to the terms and conditions of this Precedent
Agreement, Transco is willing to provide such firm transportation service for
Shipper under Cornerstone pursuant to the terms of this Precedent Agreement and
the Service Agreement (as hereinafter defined) commencing as soon as all rights
and regulatory approvals are received and accepted by Transco and all of the
necessary facilities are constructed and ready for service, as further set forth
herein below.

         NOW THEREFORE, in consideration of the mutual covenants herein assumed,
Transco and Shipper hereby agree as follows:

         1. Rights and Approvals. Following the execution by Transco and Shipper
of this Precedent Agreement, Transco shall seek such contract rights, property
rights, financing

                                       1
<PAGE>

arrangements and regulatory approvals, including, without limitation, the
requisite authorizations from the Federal Energy Regulatory Commission ("FERC"),
including recourse rates based on a straight-fixed-variable ("SFV") rate design
methodology and an incremental cost of service, as may be necessary to provide
firm transportation service for Shipper of the Contract Quantity from point(s)
of receipt set forth in Exhibit A hereto to point(s) of delivery set forth in
Exhibit B hereto, and to construct the facilities necessary to provide such firm
transportation service. Transco reserves the right to file and prosecute
applications for any required authorizations, any supplements or amendments
thereto (including the right at any time to withdraw any application for
required authorizations or not to accept such authorizations), and, if
necessary, court review, in such manner as it deems to be in its best interest.

         Shipper agrees to cooperate with and support Transco in obtaining the
necessary regulatory approvals for Cornerstone and to provide Transco with any
necessary information reasonably requested in order to obtain contract rights,
property rights, financing arrangements and/or regulatory approvals. In that
regard, Shipper shall file with the FERC in support of Transco's application
filed pursuant to Section 7(c) of the Natural Gas Act for a certificate of
public convenience and necessity authorizing Cornerstone ("FERC Authorization").
In addition, if the FERC determines that information relating to Shipper's
markets, gas supply or upstream or downstream transportation or storage
arrangements is required from Transco, Shipper shall provide Transco with such
information in a timely manner to enable Transco to respond within the time
required by the FERC. If any such information provided by Shipper is
commercially sensitive or confidential, Transco will request that the FERC treat
such information as privileged and confidential and place such information in a
nonpublic file.

                                       2
<PAGE>

         2. Service Agreement. Within thirty (30) days (or within such shorter
time frame as may be required for timely commencement of construction of
Cornerstone) after Transco's receipt and acceptance of the FERC Authorization in
a form and substance satisfactory to Transco in its sole opinion, Transco and
Shipper shall execute and deliver a service agreement under Transco's Rate
Schedule FT ("Service Agreement") substantially in the form attached as Exhibit
C hereto; provided, however, that the Parties shall not be obligated to execute
the Service Agreement if this Precedent Agreement shall have been previously
terminated in accordance with Paragraph 5 below. The Service Agreement shall
provide for the firm transportation by Transco for Shipper of the Contract
Quantity from the point(s) of receipt set forth in Exhibit A hereto to the
point(s) of delivery set forth in Exhibit B hereto. Notwithstanding the Parties'
execution of the Service Agreement, Transco's obligation to provide firm
transportation service to Shipper is expressly made subject to Transco's
receipt and acceptance of any remaining necessary contract rights, property
rights, financing arrangements and regulatory approvals in a form and substance
satisfactory to Transco in its sole opinion and Transco's completion of
construction and placement into service of Transco's facilities necessary to
provide service to Shipper under Cornerstone.

         3. Rates. For the firm transportation service under the Service
Agreement, Shipper shall pay the stated maximum reservation rate for Cornerstone
services under Transco's Rate Schedule FT, as amended from time to time, plus
all applicable commodity charges, reservation and commodity surcharges and fuel
applicable under Transco's Rate Schedule FT, as amended from time to time, for
firm transportation service under Cornerstone, unless otherwise agreed to by the
Parties.

         4. Service and Reservation Charge Commencement; Term of Service. The
firm transportation service for Shipper under Cornerstone and Shipper's
obligation to pay Transco

                                       3
<PAGE>

reservation charges for such service shall commence on the later of: (i) May 1,
2004; or (ii) the date on which Transco's facilities necessary to deliver
natural gas to Shipper under the Service Agreement have been constructed and are
ready for service as determined in Transco's sole opinion. Such firm
transportation service shall continue for a primary term of fifteen (15) years
from the date that the firm transportation service commences, and year-to-year
thereafter subject to termination after such primary term by either Party upon
one (1) year prior written notice to the other Party, unless otherwise agreed to
by the Parties. Notwithstanding anything contained herein to the contrary, in
the event the Georgia Public Utility Commission disallows a fifteen (15) year
term, Transco and Shipper shall amend this Precedent Agreement to reflect a
primary term of no less than ten (10) years at a higher rate to be determined by
Transco. Such firm transportation service shall then continue for a primary term
often (10) years from the date that the firm transportation service commences,
and (i) year-to-year thereafter subject to termination after such primary term
by either Party upon one (1) year prior written notice to the other Party,
unless otherwise agreed to by the Parties or (ii) Shipper shall have the right
to extend the primary term for an additional five (5) year term upon a minimum
of one (1) year prior written notice to Transco before the end of the ten (10)
year term, and year-to-year thereafter subject to termination after such primary
term by either Party upon one (1) year prior written notice to the other Party,
unless otherwise agreed to by the Parties..

         5. Termination of Agreements. This Precedent Agreement shall become
effective upon execution by both Transco and Shipper, and shall remain in effect
unless terminated as hereinafter provided. Transco has the right to terminate
this Agreement if Transco has not received the necessary approvals by its Board
of Directors, which approvals are expected to be obtained by no later than May
16,2002.Transco will provide written notice to Shipper under this Paragraph 5 by
no

                                       4
<PAGE>

later than May 23, 2002, if it intends to terminate this Agreement because the
necessary approvals have not been obtained. If Transco has not received and
accepted the necessary FERC Authorizations on or before April 1, 2004, then at
any time thereafter until Transco receives and accepts such FERC Authorizations,
either Party shall have the right to terminate this Precedent Agreement by
giving thirty (30) days advance written notice to the other Party; provided,
however, that such termination shall not be effective if during the 30-day
period Transco receives and accepts the necessary FERC Authorizations. Further,
if as a result of orders or actions taken by the Georgia Public Service
Commission, Shipper concludes, in Shipper's sole opinion, reasonably exercised,
that Shipper will not be able to include the firm transportation service cost
from Cornerstone as part of its capacity supply contracts, the Shipper may
terminate this Precedent Agreement by giving twenty-four (24) hours advance
written notice to Transco; provided that such right to terminate must be
exercised on or before May 31, 2002. Additionally, if Transco has not commenced
the firm transportation service contemplated herein to Shipper on or before May
1, 2005, either Party shall have the right to terminate this Precedent Agreement
and the Service Agreement by giving twenty-four (24) hours advance written
notice to the other Party; provided that such right must be exercised on or
before May 15, 2005, or else such right shall be waived. Furthermore, Transco
shall have the right to terminate this Precedent Agreement immediately upon
written notice to Shipper if (i) Shipper, in Transco's reasonable judgment,
fails to demonstrate creditworthiness, and (ii) Shipper fails to provide
adequate security as determined by Transco. Except as otherwise provided herein
or unless otherwise agreed to by the Parties, termination of this Precedent
Agreement in accordance with the terms of this Paragraph 5 shall be without
liability for costs or expenses to the terminating Party or its partners,
shareholders, officers, employees or agents.

                                       5
<PAGE>

         6. Construction. After both Parties' execution of the Service Agreement
pursuant to Paragraph 1 above and Transco's receipt and acceptance of all other
necessary contract rights, property rights, financing arrangements and
regulatory approvals in a form and substance satisfactory to Transco in its sole
opinion, reasonably exercised, Transco shall proceed with the construction of
the Cornerstone facilities so as to begin firm transportation service for
Shipper by a proposed in-service date of May 1, 2004. If Transco is unable to
complete such construction and place such facilities into operation by such
proposed in-service date despite its exercise of due diligence, Transco shall
provide notice thereof to Shipper, with such notice including the revised
projected in-service date, and shall continue to proceed with due diligence to
complete such construction, place such facilities in operation and commence
service for Shipper at the earliest practicable date thereafter. Transco shall
not be liable in any manner to Shipper, nor shall this Precedent Agreement or
the Service Agreement be subject to termination other than in accordance with
the termination rights set forth in Paragraph 5 above, if for any reason Transco
is unable to complete the construction of such facilities and commence firm
transportation service contemplated herein by the proposed in-service date.

         7. Prepayment Refund. Transco and Shipper agree that any prepayment
submitted by Shipper for service under Cornerstone plus any interest that
accrues on the prepayment amount (any interest on the prepayment amount
calculated hereunder shall be at the interest rate set forth in the billing and
payment provisions of the General Terms and Conditions of Transco's FERC Gas
Tariff) prior to the in-service date of the project will be applied to Shipper's
reservation charges due for the first month of firm transportation service under
the project. In the event that service commences on a

                                       6
<PAGE>

date other than the first day of the month, the reservation charge will be
prorated and the prepayment plus accrued interest will be applied to such
prorated reservation charge. In the event either Party terminates this Precedent
Agreement pursuant to Paragraph 5 above, other than termination by Transco due
to Shipper's failure to demonstrate creditworthiness and failure to provide
adequate security, Transco shall promptly refund Shipper's prepayment plus
accrued interest.

         8. Remedies. Shipper recognizes that Transco will be required to incur
material expenses to construct the Cornerstone facilities by a proposed
in-service date of May 1, 2004. In the event that Shipper fails to perform its
obligations under this Precedent Agreement or terminates this Precedent
Agreement in a manner inconsistent with Paragraph 5 above, or in the event that
Transco terminates this Precedent Agreement due to Shipper failing to
demonstrate creditworthiness and failing to provide adequate security pursuant
to Paragraph 6 above, Transco shall have the right to retain Shipper's
prepayment (plus accrued interest) made in accordance with Shipper's request for
firm transportation service under Cornerstone and to seek any other legal
remedies available to Transco.

         9. Notices. Any notices hereunder shall be in writing and shall be
addressed as follows:

         If to Shipper:
         United Cities Gas Company,
         A division of Atmos Energy Corporation
         P. 0. Box 650205
         (5430 LBJ Freeway, Suite 160, 75240)
         Dallas, TX 75265-0205
         Facsimile: 972-855-3773
         Attention: Contract Administration

         If to Transco:
         Transcontinental Gas Pipe Line Corporation
         P. 0. Box 1396
         (2800 Post Oak Boulevard 77056)
         Houston, Texas 77251-1396
         Facsimile: 713-215-2549
         Attention: Vice President - Planning and Development

                                       7
<PAGE>

Notices may be given by hand, electronic transmission, mail or courier. Notices
shall be deemed given upon the date the notice is sent. Either party may change
its address or facsimile number for notices hereunder by providing written
notice of such change to the other party.

         10. Assignment. Either Party may, without the prior consent of the
other Party, pledge, mortgage or assign its rights hereunder to any entity as
security for its indebtedness, provided that such entity meets the non-assigning
Party's creditworthiness requirements; otherwise, any assignment of this
Precedent Agreement or any of the rights and obligations hereunder shall be void
and of no force or effect unless the assigning Party first obtains the consent
thereto in writing of the other Party. With respect to the foregoing sentence,
Shipper and Transco hereby agree to execute and deliver to any pledgee or
mortgagee of the other Party upon written request by such Party as soon as
reasonably practicable a consent to assignment to the extent such consent does
not alter any of the terms and conditions of this Precedent Agreement. Any
assignment hereof shall be subject to the receipt and acceptance by Transco of
any necessary regulatory or governmental authorizations. This Precedent
Agreement shall be binding upon and shall inure to the benefit of the respective
authorized successors and assigns.

         11. Governing Law. This Precedent Agreement and any actions, claims,
demands or settlements hereunder shall be governed by and construed in
accordance with the laws of the State of Texas, excluding, however, any
"conflicts of laws" rules or principles which might require the application of
the laws of another jurisdiction.

         12. Third Persons. Except as expressly provided in this Precedent
Agreement, nothing

                                       8
<PAGE>

herein expressed or implied is intended or shall be construed to confer upon or
to give any person not a Party hereto any rights, remedies or obligations under
or by reason of this Precedent Agreement.

         13. Laws and Regulatory Bodies. This Precedent Agreement and the
obligations of the Parties hereunder are subject to all applicable laws, rules,
orders and regulations of governmental authorities having jurisdiction and, in
the event of conflict, such laws, rules, orders and regulations of governmental
authorities having jurisdiction shall control.

         14. Captions. The titles to each of the paragraphs in this Precedent
Agreement are included for convenience of reference only and shall have no
effect on, or be deemed as part of the text of, this Precedent Agreement.

         15. Severability. Any provision of this Precedent Agreement that is
prohibited or unenforceable in any jurisdiction shall, as to that jurisdiction,
be ineffective to the extent of that prohibition or unenforceability without
invalidating the remaining provisions hereof or affecting the validity or
enforceability of that provision in any other jurisdiction.

         16. Waiver. No waiver by either Party of any default by the other Party
in the performance of any provision, condition or requirement herein shall be
deemed to be a waiver of, or in any manner release the other Party from,
performance of any other provision, condition or requirement herein, nor shall
such waiver be deemed to be a waiver of, or in any manner release the other
Party from, future performance of the same provision, condition or requirement.
Any delay or omission of either Party to exercise any right hereunder shall not
impair the exercise of any such right, or any like right, accruing to it
thereafter.

         17. Further Assurances. Each Party agrees to execute and deliver all
such other and additional instruments and documents and to do such other acts as
may be reasonably necessary to effectuate the terms and provisions of this
Precedent Agreement.

                                       9
<PAGE>

         18. Joint Preparation. The terms, conditions and provisions of this
Precedent Agreement shall be considered as prepared through the joint efforts of
the Parties and shall not be construed against either Party as a result of the
preparation or drafting thereof.

                                       10
<PAGE>

          IN WITNESS WHEREOF, duly authorized representatives of the Parties
have executed this Precedent Agreement as of the date first above written.

                                       TRANSCONTINENTAL GAS PIPE LINE
                                                CORPORATION

                                       BY:         /s/ JAMES C. MOORE
                                           -------------------------------------
                                           James C. Moore
                                           Vice President
                                           Planning and Development

                                       UNITED CITIES GAS COMPANY,
                                       A DIVISION OF ATMOS ENERGY CORPORATION

                                       By:         /s/ Gordon J. Roy
                                           -------------------------------------
                                           Gordon J. Roy, Vice President

<PAGE>
                                    EXHIBIT A

<Table>
<Caption>
                                                      MAXIMUM DAILY QUANTITY
                                                      AT EACH RECEIPT POINT
              RECEIPT POINT                                  (dt/day)(1)
              -------------                           ----------------------
<S>                                                   <C>
1) Point of interconnection between Transco's
mainline system and Destin Pipeline
at milepost 756.860 in Clarke County, MS                        3,000

2) Transco's Compressor Station 65
at the existing point of interconnection
between Transco's southeast Louisiana
lateral and Transco's mainline in
St. Helena Parish, LA                                           3,000
</Table>

----------

(1) These quantities do not include the additional quantities of gas to be
retained by Transco for compressor fuel and line loss make-up. Therefore,
Shipper also shall deliver or cause to be delivered at the receipt points such
additional quantities of gas to be retained by Transco for compressor fuel and
line loss make-up.

<PAGE>

                                    EXHIBIT B

<Table>
<Caption>
                                                MAXIMUM DAILY QUANTITY AT EACH
            DELIVERY POINT                          DELIVERY POINT (dt/day)
            --------------                      ------------------------------
<S>                                             <C>
United Cities Gainesville Meter Station
located at milepost 1096.57 on Transco's
main transmission line in Oconee County, GA                  6,000
</Table>

<PAGE>

                                    EXHIBIT C

                                SERVICE AGREEMENT

                                     Between

                   TRANSCONTINENTAL GAS PIPE LINE CORPORATION

                                       and

                                      Buyer

<PAGE>
Transcontinental Gas Pipe Line Corporation           Third Revised Sheet No. 436
FERC Gas Tariff                                                      Superseding
Third Revised Volume No. 1                                        Second Revised

                            FORM OF SERVICE AGREEMENT
                    (For Use Under Sellers Rate Schedule FT)

         THIS AGREEMENT entered into this ___________ day of __________________,
_____________ (year), by and between TRANSCONTINENTAL GAS PIPE LINE CORPORATION,
a Delaware corporation, hereinafter referred to as "Seller," first party, and
_____________________________________________, hereinafter referred to as
"Buyer," second party,

                                   WITNESSETH

      WHEREAS,

      NOW, THEREFORE, Seller and Buyer agree as follows:

                                   ARTICLE I
                           GAS TRANSPORTATION SERVICE

      1. Subject to the terms and provisions of this agreement and of Seller's
Rate Schedule PT, Buyer agrees to deliver or cause to be delivered to Seller gas
for transportation and Seller agrees to receive, transport and redeliver natural
gas to Buyer or for the account of Buyer, on a firm basis, up to a
Transportation Contract Quantity ("TCQ") of _______________________ dt per day.

      2. Transportation service rendered hereunder shall not be subject to
curtailment or interruption except as provided in Section 11 of the General
Terms and Conditions of Seller's FERC Gas Tariff.

                                   ARTICLE II
                               POINT(S) OF RECEIPT

      Buyer shall deliver or cause to be delivered gas at the point(s) of
receipt hereunder at a pressure sufficient to allow the gas to enter Seller's
pipeline system at the varying pressures that may exist in such system from time
to time; provided, however, the pressure of the gas delivered or caused to be
delivered by Buyer shall not exceed the maximum operating pressure(s) of
Seller's pipeline system at such point(s) of receipt. In the event the maximum
operating pressure(s) of Seller's pipeline system, at the point(s) of receipt
hereunder, is from time to time increased or decreased, then the maximum
allowable pressure(s) of the gas delivered or caused to be delivered by Buyer to
Seller at the point(s) of receipt shall be correspondingly increased or
decreased upon written notification of Seller to Buyer. The point(s) of receipt
for natural gas received for transportation pursuant to this agreement shall be:

      See Exhibit A, attached hereto, for points of receipt.

                                   ARTICLE III
                              POINT(S) OF DELIVERY

      Seller shall redeliver to Buyer or for the account of Buyer the gas
transported hereunder at the following point(s) of delivery and at a pressure(s)
of:

      See Exhibit B, attached hereto, for points of delivery and pressures.

Issued by: Frank J. Ferazzi, Vice President
Issued on: November 21, 1997                        Effective: December 21, 1997

<PAGE>
Transcontinental Gas Pipe Line            Substitute Fifth Revised Sheet No. 437
  Corporation                                                        Superseding
FERC Gas Tariff                                      Fifth Revised Sheet No. 437
Third Revised Volume No. 1

                            FORM OF SERVICE AGREEMENT
                    (For Use under Seller's Rate Schedule FT)
                                   (Continued)

                                   ARTICLE IV
                                TERM OF AGREEMENT

         This agreement shall be effective as of _________________________,
___________ (year) and shall remain in force and effect until 9:10 a.m. Central
Clock Time ____________________, _______ (year) and thereafter until terminated
by Seller or Buyer upon at least _______________________________ written notice;
provided, however, this agreement shall terminate immediately and, subject to
the receipt of necessary authorizations, if any, Seller may discontinue service
hereunder if (a) Buyer, in Seller's reasonable judgment fails to demonstrate
credit worthiness, and (b( Buyer fails to provide adequate security in
accordance with Section 32 of the General Terms and Conditions of Seller's
Volume No. 1 Tariff. As set forth in Section 8 of Article II of Seller's August
7, 1989 revised Stipulation and Agreement in Gocket Nos. RP88-68 etal., (a)
pregranted abandonment under Section 284.221(d) of the Commission's Regulations
shall not apply to any long term conversions from firm sales service to
transportation service under Seller's Rate Schedule FT and (b) Seller shall not
exercise its right to terminate this service agreement as it applies to
transportation service resulting from conversions from firm sales service so
long as Buyer is willing to pay rates no lees favorable than Seller is otherwise
able to collect from third parties for such service.

                                    ARTICLE V
                             RATE SCHEDULE AND PRICE

         1. Buyer shall pay Seller for natural gas delivered to Buyer hereunder
in accordance with Seller's Rate Schedule FT and the applicable provisions of
the General Terms and Conditions of Seller's FERC Gas Tariff as filed with the
Federal Energy Regulatory Commission, and as the same may be legally amended or
superseded from time to time. Such Rate Schedule and General Terms and
Conditions are by this reference made a part hereof. In the event Buyer and
Seller mutually agree to a negotiated rate pursuant to the provisions in Section
53 of the General Terms and Conditions and specified term for service hereunder,
provisions governing such negotiated rate (including surcharges) and term shall
be set forth on Exhibit C to the service agreement.

         2. Seller and Buyer agree that the quantity of gas that Buyer delivers
or causes to be delivered to Seller shall include the quantity of gas retained
by Seller for applicable compressor fuel, line loss make-up (and injection fuel
under Seller's Rate Schedule OSS, if applicable) in providing the transportation
service hereunder, which quantity may be changed from time to time and which
will be specified in the currently effective Sheet No. 44 of Volume No. 1 of
this Tariff which relates to service under this agreement and which is
incorporated herein.

         3. In addition to the applicable charges for firm transportation
service pursuant to Section 3 of Seller's Rate Schedule FT, Buyer shall
reimburse Seller for any and all filing fees incurred as a result of Buyer's
request for service under Seller's Rate Schedule FT, to the extent such fees are
imposed upon Seller by the Federal Energy Regulatory Commission or any successor
governmental authority having jurisdiction.

                                   ARTICLE VI
                                  MISCELLANEOUS

         1. This Agreement supersedes and cancels as of the effective date
hereof the following contract(s) between the parties hereto:

         2. No waiver by either party of any one or more defaults by the other
in the performance of any provisions of this agreement shall operate or be
construed as a waiver of any future default or defaults, whether of a like or
different character.

Issued by: Frank J. Ferazzi, Vice President
Issued on: October 15, 1999                          Effective: November 1, 1999

<PAGE>
Transcontinental Gas Pipe Line Corporation                Original Sheet No. 438
FERC Gas Tariff
Third Revised Volume No. 1

                            FORM OF SERVICE AGREEMENT
                    (For Use Under Seller's Rate Schedule FT)
                                   (Continued)

         3. The interpretation and performance of this agreement shall be in
accordance with the laws of the State of ________________________ without
recourse to the law governing conflict of laws, and to all present and future
valid laws with respect to the subject matter, including present and future
orders, rules and regulations of duly constituted authorities.

         4. This agreement shall be binding upon, and inure to the benefit of
the parties hereto and their respective successors and assigns.

         5. Notices to either party shall be in writing and shall be considered
as duly delivered when mailed to the other party at the following address:

         (a)      If to Seller:
                  Transcontinental Gas Pipe Line Corporation
                  P.0. Box 1388
                  Houston, Texas  77251
                  Attention:

         (b)      If to Buyer:

         Such addresses may be changed from time to time by mailing appropriate
notice thereof to the other party by certified or registered mail.

         IN WITNESS WHEREOF, the parties hereto have caused this agreement to be
signed by their respective officers or representatives thereunto duly
authorized.

                                       TRANSCONTINENTAL GAS PIPE LINE
                                                CORPORATION
                                                  (Seller)

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

                                       -------------------------------------
                                                   (Buyer)

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

Issued by: M. D. White, President
Issued on: July 22, 1991                               Effective: August 1, 1991
Filed to comply with order of the Federal Energy
   Regulatory Commission.
Docket No. CP88-391-006, issued June 19, 1991

<PAGE>
Transcontinental Gas Pipe Line Corporation    Substitute Original Sheet No. 438A
FERC Gas Tariff
Third Revised Volume No. 1

                            FORM OF SERVICE AGREEMENT
                    (For Use Under Seller's Rate Schedule FT)
                                   (Continued)

                                    Exhibit A

        Point(s) of Receipt

Issued by: R. W. Best, President
Issued on: August 31, 1992                          Effective: September 1, 1992

<PAGE>
Transcontinental Gas Pipe Line Corporation    Substitute Original Sheet No. 438B
FERC Gas Tariff
Third Revised Volume No. 1

                            FORM OF SERVICE AGREEMENT
                    (For Use Under Seller's Rate Schedule FT)
                                   (Continued)

                                    Exhibit B

          Points(s) of Delivery

Issued by: R. W. Best, President
Issued on: August 31, 1992                          Effective: September 1, 1992

<PAGE>
Transcontinental Gas Pipe Line Corporation               Original Sheet No. 438C
FERC Gas Tariff
Third Revised Volume No. 1

                            FORM OF SERVICE AGREEMENT
                    (For Use Under Seller's Rate Schedule FT)
                                   (Continued)

                                    EXHIBIT C

Specification of Negotiated Rate and Term

Issued by: Frank J. Ferazzi, Vice President
Issued: August 30, 1996                               Effective: October 1, 1996

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