Document:

<PAGE>

                                                                EXHIBIT 10.13(g)

                     FIRM NO-NOTICE TRANSPORTATION AGREEMENT

                                     between

                       TEXAS GAS TRANSMISSION CORPORATION

                                       and

                         MISSISSIPPI VALLEY GAS COMPANY

                                      Dated

                                NOVEMBER 1, 1997

<PAGE>

                     FIRM NO-NOTICE TRANSPORTATION AGREEMENT
                                Rate Schedule NNS

         THIS AGREEMENT, made and entered into this 1st day of November, 1997,
by and between Texas Gas Transmission Corporation, a Delaware corporation,
hereinafter referred to as "Texas Gas," and Mississippi Valley Gas Company, a
Mississippi corporation, hereinafter referred to as "Customer,"

                                   WITNESSETH:

         WHEREAS, Customer was receiving a firm, bundled city gate sales service
from Texas Gas on May 18, 1992, under provisions of a sales service agreement
dated November 1, 1997; and

         WHEREAS, Customer desires to continue receiving the equivalent
transportation service formerly embedded in its bundled sales service, or
portion thereof, as no-notice service; and

         WHEREAS, Texas Gas desires to provide and Customer desires to receive
such no-notice service under its NNS Rate Schedule on the terms and conditions
set forth herein;

         NOW THEREFORE, in consideration of the premises and of the mutual
covenants herein contained, the parties hereto covenant and agree as follows:

                             ARTICLE I. DEFINITIONS

1.1 The definitions in Section 3 of Rate Schedule NNS, as well as Section 1 of
the General Terms and Conditions of Texas Gas's FERC Gas Tariff, are hereby
incorporated by reference and made a part of this Agreement.

                              ARTICLE II. QUANTITY

2.1 Pursuant to Texas Gas's Rate Schedule NNS and subject to the terms and
provisions of this Agreement, Customer agrees to deliver or cause to be
delivered to Texas Gas at the Point(s) of Receipt in Exhibit "A" hereunder, gas
for transportation and Texas Gas agrees to receive, transport, and redeliver to
Customer at the Point(s) of Delivery in Exhibit "B" hereunder, the daily and
seasonal quantities of gas set forth herein. The parties agree that the
transportation service provided hereunder shall be a firm service provided by
combining pipeline capacity (the "Nominated" portion of the service) and storage
capacity (the "Unnominated" portion of the service) into a single transportation
service.

2.2 The maximum daily quantity of gas which Texas Gas shall be obligated to
transport and redeliver to Customer, and which Customer shall be obligated to
receive, is Customer's applicable Contract Demand expressed on a seasonal basis
as set forth below:

<Table>
<Caption>
                       Daily
                   Contract Demand                    MMBtu/D
                   ---------------                    -------
<S>                                                   <C>

                        Winter                         50,429
                        Summer                          5,000
</Table>

2.3 The above Contact Demands consist of a Nominated Daily Quantity, for which
Customer is responsible for scheduling the delivery of gas supplies into Texas
Gas's system, and an Unnominated Daily Quantity, which is

                                       2
<PAGE>

automatically delivered from storage by Texas Gas to meet Customer's
requirements. Those quantities, expressed on a seasonal basis, are set forth
below:

<Table>
<Caption>
              Nominated Daily Quantity                         MMBtu/D
              ------------------------                         -------
<S>                                                            <C>

              Winter                                             5,000
              Summer                                             5,000
</Table>

<Table>
<Caption>
              Unnominated Daily Quantity                       MMBtu/D
              --------------------------                       -------
<S>                                                            <C>
              Winter                                            45,429
</Table>

2.4 Customer's Excess Unnominated Daily Quantity shall be 5,043 MMBtu per day,
which is ten percent (10%) of its Winter Contract Demand.

2.5 The maximum seasonal quantities of gas which Texas Gas shall be obligated to
transport and deliver to Customer, and which Customer shall be obligated to
receive, are Customer's Seasonal Quantity Entitlements as set forth below:

<Table>
<Caption>
                     Seasonal
                Quantity Entitlement                              MMBtu
                --------------------                            ---------
<S>                                                            <C>
                     Winter                                     1,785,797
                     Summer                                     1,070,000
</Table>

2.6 A portion of Customer's Winter Quantity Entitlement consists of unnominated
quantities of gas delivered by Texas Gas from storage. The maximum net quantity
of gas Texas Gas is obligated to deliver to Customer from storage during any
Winter Season is Customer's Unnominated Seasonal Quantity, which is 1,030,797
MMBtu. In addition to scheduling the receipt of Customer's Summer Quantity
Entitlement, Customer is also responsible for the redelivery each summer of that
portion of Customer's Unnominated Seasonal Quantity actually used the prior
winter, as more fully set forth herein.

2.7 Customer shall reimburse Texas Gas for the Quantity of Gas required for
fuel, company use, and unaccounted for associated with the transportation
service hereunder in accordance with Section 16 of the General Terms and
Conditions of Texas Gas's FERC Gas Tariff. Texas Gas may adjust the fuel
retention percentage as operating circumstances warrant; however, such change
shall not be retroactive. Texas Gas agrees to give Customer thirty (30) days
written notice before changing such percentage.

2.8 Texas Gas, at its sole option, may, if tendered by Customer, transport
daily quantities in excess of Customer's Contract Demand.

2.9 In order to protect its system, the delivery of gas to its customers and/or
the safety of its operations, Texas Gas shall have the right to vent excess
natural gas delivered to Texas Gas by Customer or Customer's supplier(s) in that
part of its system utilized to transport gas received hereunder. Prior to
venting excess gas, Texas Gas will use its best efforts to contact Customer or
Customer's supplier in an attempt to correct such excess deliveries to Texas
Gas. Texas Gas may vent such excess gas solely within its reasonable judgment
and discretion without liability to Customer, and a pro rata share of any gas so
vented shall be allocated to Customer. Customer's pro rata share shall be
determined by a fraction, the numerator of which shall be the quantity of gas
delivered to Texas Gas at the Point of Receipt by Customer or Customer's
suppliers in excess of Customer's confirmed nomination and the denominator of
which shall be the total quantity of gas in excess of total confirmed
nominations flowing in that part of Texas Gas's system utilized to transport
gas, multiplied by the total quantity of gas vented or lost hereunder.

                                       3
<PAGE>

                           ARTICLE III. SCHEDULING OF
                       CUSTOMER'S NOMINATED DAILY QUANTITY

3.1 This Article III only applies to the scheduling of the Nominated Daily
Quantity portion of Customer's Contract Demand and not to the Unnominated Daily
Quantity of Unnominated Seasonal Quantity delivered from storage.

3.2 Customer shall be obligated four (4) working days prior to the end of each
month to furnish Texas Gas with a schedule of the estimated daily quantity(ies)
of gas it desires to be received, transported, and redelivered for the following
month. Such schedules will show the quantity(ies) of gas Texas Gas will receive
from Customer at the Point(s) of Receipt, along with the identity of the
supplier(s) that is delivering or causing to be delivered to Texas Gas
quantities for Customer's account at each Point of Receipt for which a
nomination has been made.

3.3 Customer shall give Texas Gas, after the first of the month, twenty-four
(24) hours notice prior to the commencement of any day in which Customer desires
to change the quantity(ies) of gas it has scheduled to be delivered to Texas Gas
at the Point(s) of Receipt. If Customer's nomination change does not require
Texas Gas to interrupt service to another customer, Texas Gas will agree to
waive this 24-hour prior notice and implement nomination changes requested by
customer to commence in such lesser time frame subject to Texas Gas's being able
to confirm and verify such nomination change at both receipt and delivery
points, and receive PDA's reflecting this nomination change at both receipt and
delivery points. Texas Gas will use its best efforts to make the nomination
change effective at the time requested by customer; however, if Texas Gas is
unable to do so, the nomination change will be implemented as soon as
confirmation is received.

                   ARTICLE IV. POINTS OF RECEIPT AND DELIVERY
                          AND SUPPLY LATERAL ALLOCATION

4.1 Customer shall deliver or cause to be delivered natural gas to Texas Gas at
the Point(s) of Receipt specified in Exhibit "A" attached hereto and Texas Gas
shall redeliver gas to Customer or for the account of Customer at the Point(s)
of Delivery specified in Exhibit "B" attached hereto, in accordance with
Sections 7 and 15 of the General Terms and Conditions of Texas Gas's FERC Gas
Tariff.

4.2 Customer's preferential capacity rights on each of Texas Gas's supply
laterals shall be as set forth in Exhibit "C" attached hereto, in accordance
with Section 34 of the General Terms and Conditions of Texas Gas's FERC Gas
Tariff.

                          ARTICLE V. TERM OF AGREEMENT

5.1 This Agreement shall become effective November 1, 1997, and shall remain in
full force and effect for a primary term of five (5) years ending October 31,
2002. At the end of such primary term, or any subsequent rollover term, this
Agreement shall automatically be extended for an additional rollover term of
five (5) years, unless Customer terminates this Agreement at the end of such
primary or rollover term by giving Texas Gas at least 365 days advance written
notice prior to the expiration of the primary term or any subsequent rollover
term.

                        ARTICLE VI. POINT OF MEASUREMENT

6.1 The gas shall be measured or caused to be measured by Customer and/or Texas
Gas at the Point(s) of Measurement which shall be as specified in Exhibits A,
A-I, and B herein. In the event of a line loss or leak between the Point of
Measurement and the Point of Receipt, the loss shall be determined in accordance
with the methods described in Section 3, "Measuring and Measuring Equipment,"
contained in the General Terms and Conditions of First Revised Volume No. 1 of
Texas Gas's FERC Gas Tariff.

                                       4
<PAGE>
                             ARTICLE VII. FACILITIES

7.1 Texas Gas and Customer agree that any facilities required at the Point(s) of
Receipt, Point(s) of Delivery, and Point(s) of Measurement, shall be installed,
owned, and operated as specified in Exhibits A, A-I, and B herein. Customer may
be required to pay or cause Texas Gas to be paid for the installed cost of any
new facilities required as contained in Sections 1.3, 1.4 and 1.5 of Texas Gas's
FT Rate Schedule. Customer shall only be responsible for the installed cost of
any new facilities described in this Section if agreed to in writing between
Texas Gas and Customer.

                         ARTICLE VIII. RATES AND CHARGES

8.1 Unless otherwise agreed to in writing by Texas Gas and Customer, Customer
shall pay to Texas Gas each month a Reservation Charge which shall consist of
the applicable Contract Demand as specified in this Agreement multiplied by the
applicable demand rate per MMBtu. The Reservation Charge shall be billed as of
the effective date of this Agreement. Unless otherwise agreed to in writing by
Texas Gas and Customer, Customer shall also pay Texas Gas the Maximum Commodity
Rate per MMBtu of gas delivered by Texas Gas for no-notice transportation
services rendered to Customer up to Customer's applicable Contract Demand. For
all gas quantities delivered in excess of Customer's applicable Contract Demand
on any day, Customer shall pay the NNS Overrun Rate per MMBtu, as described
in the NNS Rate Schedule. In addition, Customer shall pay any and all currently
effective demand or commodity surcharges, including but not limited to, the GRI
Funding Unit, the FERC ACA Unit Charge, Texas Gas's Take-or-Pay surcharge, and
Order 636 Transition Costs surcharge.

         If Texas Gas declares force majeure which renders it unable to perform
service for Customer under this Agreement either in whole or part, then Customer
shall be relieved of its obligation to pay NNS demand charges for that part of
its NNS contract demand affected by such force majeure event until the force
majeure event is remedied.

         Unless otherwise agreed to in writing by Texas Gas and Customer, Texas
Gas may, from time to time, and at any time selectively after negotiation,
adjust the rate(s) applicable to any individual Customer; provided, however,
that such adjusted rate(s) shall not exceed the applicable Maximum Rate(s) nor
shall they be less than the Minimum Rate(s) set forth in the currently effective
Sheet No. 10 of Texas Gas's FERC Gas Tariff. If Texas Gas so adjusts any rates
to any Customer, Texas Gas shall file with the Commission any and all required
reports respecting such adjusted rate.

8.2 In the event Customer utilizes a Secondary Point(s) of Delivery for
transportation service herein, Customer will continue to pay the monthly
reservation charges as described in Section 8.1 above. In addition, Customer
will pay the maximum commodity charge applicable to the zone in which gas is
delivered up to Customer's applicable Contract Demand and the maximum overrun
commodity charge for any quantities delivered by Texas Gas in excess of
Customer's Seasonal Quantity Entitlement. Customer also agrees to pay the ACA,
Take-or-Pay Surcharge, GRI charges, fuel retention charge, and any other
effective surcharges, if applicable, as described in Section 8.1 above.

8.3 It is further agreed that Texas Gas may seek authorization from the
Commission and/or other appropriate body for such changes to any rate(s) and
terms set forth herein or in Texas Gas's tariff, as may be found necessary to
assure Texas Gas just and reasonable rates. Nothing herein contained shall be
construed to deny Customer any rights it may have under the Natural Gas Act, as
amended, including the right to participate fully in rate proceedings by
intervention or otherwise to contest increased rates in whole or in part.

8.4 Customer agrees to fully reimburse Texas Gas for all fees, if any,
associated with the service contemplated herein which Texas Gas is required to
pay to the Commission or any agency having or assuming jurisdiction of the
transactions contemplated herein.

8.5 Customer agrees to execute or cause its supplier or processor to execute a
separate agreement with Texas Gas providing for the transportation of any
liquids and/or liquefiables, and agrees to pay or reimburse Texas Gas, or cause
Texas Gas to be paid or reimbursed, for any applicable rates or charges
associated with the transportation of such liquids and/or liquefiables, as
specified in Section 24 of the General Terms and Conditions of Texas Gas's FERC
Gas Tariff.

                                       5
<PAGE>
                           ARTICLE IX. WINTER SERVICE

9.1 Customer will only be required to nominate into Texas Gas's system a
quantity of gas up to the Nominated Daily Quantity.

9.2 In addition to the Nominated Daily Quantity actually scheduled by Customer,
Texas Gas will adjust deliveries from storage up to Customer's Unnominated Daily
Quantity to meet Customer's city gate requirements up to Customer's Winter
Contract Demand.

9.3 In addition, Customer may exceed its Unnominated Daily Quantity by a
quantity equal to its Excess Unnominated Daily Quantity (i.e. 10% of its Winter
Contract Demand) for up to two consecutive gas days without a penalty; however,
total deliveries to the Customer may not exceed the Customer's Winter Contract
Demand. Texas Gas will notify the Customer within four (4) hours of the end of
the gas day in which Customer has exceeded its Unnominated Daily Quantity. If
the Customer does not cease taking such Excess Unnominated Daily Quantity from
Texas Gas's storage after two consecutive gas days, then pipeline may assess a
penalty of $15 per MMBtu of such excess gas taken and may issue an operational
flow order requiring Customer to immediately inject additional gas supply and/or
reduce city gate deliveries so that the customer is no longer exceeding his
Unnominated Daily Quantity.

9.4 Monthly Maximum Withdrawal: No more than 50% of Customer's Unnominated
Seasonal Quantity shall be withdrawn in any consecutive thirty (30) day period.

9.5 Seasonal Minimum and Maximum Withdrawal: No more than 105% of Customer's
Unnominated Seasonal Quantity shall be withdrawn by March 1; provided further,
that no less than 68% and no more than 100% of Customer's Unnominated Seasonal
Quantity shall be withdrawn by April 1 (the end of the Winter Season).

9.6 Adjusted Unnominated Daily Quantity: As Customer's Unnominated Seasonal
Quantity (USQ) is withdrawn, that portion of Customer's Unnominated Daily
Quantity (UDQ) available to Customer shall be adjusted. Customer's Adjusted
Unnominated Daily Quantity (UDQ) shall be equal to the greater of its average
winter daily unnominated quantity (i.e., Customer's USQ divided by the total
number of Winter days the UDQ is available) or the applicable percentage of its
Unnominated Daily Quantity (UDQ) as set forth in the following table:

<Table>
<Caption>
                      % USQ Withdrawn          % UDQ Available
                      ---------------          ---------------
<S>                                            <C>

                            75%                       90%
                            80%                       85%
                            85%                       80%
                            90%                       75%
</Table>

9.7 During the Winter Season, Texas Gas will also inject gas into storage on a
best efforts basis as part of NNS service. Although such injections will be
done on a best efforts basis, Texas Gas will be presumed, unless it gives notice
to the contrary, to be able to inject into storage such quantities of gas as to
take into account routine variations in no-notice deliveries. If Texas Gas is
unable to make such best efforts injections, it will advise Customer by posting
on its electronic bulletin board. However, no presumption will exist for
nonroutine situations (e.g. injections in excess of 15% of Customer's Winter
Contract Demand or sustained injections of more than five days) and Customer
must give 24 hours advance written notice to Texas Gas of quantities it desires
to inject into storage, so that Texas Gas can determine the extent to which it
can make such injections and adjust its operations accordingly.

                           ARTICLE X. SUMMER SERVICE

10.1 Texas Gas shall deliver to Customer at the city gate during each Summer
Season up to the Customer's Summer Contract Demand and Summer Quantity
Entitlement as nominated by Customer.

                                       6
<PAGE>
10.2 Pursuant to the provisions set forth below, Customer shall deliver in kind
to Texas Gas during each Summer Season a quantity of gas equal to that portion
of Customer's Unnominated Seasonal Quantity actually utilized by Customer
(including any infield transfers pursuant to Section 25.8(c) of the General
Terms and Conditions of this tariff) during the prior Winter Season. Customer
shall reserve and utilize such portion of its Summer Contract Demand as
necessary to redeliver such volumes into storage.

10.3 Maximum Daily Injection Quantity: To protect the storage formations and
allow uniform filling of the storage reservoirs, Customer will be required to
adhere to certain injection limits (calculated as a percentage of the
Unnominated Seasonal Quantity), throughout the summer injection period. During
the Summer Season Customer may, on a daily basis, inject according to the
following table:

<Table>
<Caption>
                   % of Unnominated            Maximum Available
                   Seasonal Quantity             Injection Rate
                        Injected                  (% of USQ)
                   ----------------            -----------------
<S>                                            <C>

                        0%- 65%                         1.3%
                        65%-90%                         1.1%
                         >90%                           0.6%
</Table>

10.4 Inventory verification tests will be conducted on a semiannual basis. These
tests require the temporary suspension of individual storage field activities
(injections and withdrawals) for a period of approximately two weeks. If
conditions will not permit the full maximum daily injection or withdrawal
quantity, Texas Gas may temporarily adjust the limit and allow makeup quantities
on succeeding days. Texas Gas will provide at least 45 days prior notice in
regard to the scheduling of these shut-in periods.

10.5 During the Summer Season, Texas Gas will also withdraw gas from storage on
a best efforts basis as part of the NNS service. Although such withdrawals will
be done on a best efforts basis, Texas Gas will be presumed, unless it gives
notice to the contrary, to be able to withdraw from storage such quantities of
gas as to take into account routine variations in no-notice services. If Texas
Gas is unable to make such best efforts withdrawals, it will advise Customer by
posting on its electronic bulletin board. However, no presumption will exist for
nonroutine situations (e.g. withdrawals in excess of 10% of Customer's Winter
Contact Demand or sustained withdrawals of more than five days) and Customer
must give 24 hours advance written notice to Texas Gas of quantities it desires
to withdraw from storage, so that Texas Gas can determine the extent to which it
can make such withdrawals and adjust its operations accordingly.

10.6 To assist Texas Gas's operational and maintenance scheduling through the
Summer Season, Customer will notify Texas Gas by March 15 of each year, with
updates monthly, of the quantities it intends to inject monthly during the
immediately upcoming Summer Season; such injection schedule provided by Customer
is a best efforts estimate and may be revised as necessary. Texas Gas will use
its reasonable efforts to coordinate its test, maintenance, alteration and
repair activities during such Summer Season to accommodate Customer's request.

                            ARTICLE XI. MISCELLANEOUS

11. 1 Texas Gas's Transportation Service hereunder shall be subject to receipt
of all requisite regulatory authorizations from the Commission, or any successor
regulatory authority, and any other necessary governmental authorizations, in a
manner and form acceptable to Texas Gas. The parties agree to furnish each other
with any and all information necessary to comply with any laws, orders, rules,
or regulations.

11.2 Except as may be otherwise provided, any notice, request, demand,
statement, or bill provided for in this Agreement or any notice which a party
may desire to give the other shall be in writing and mailed by regular mail, or
by postpaid registered mail, effective as of the postmark date, to the post
office address of the party intended to receive the same, as the case may be, or
by facsimile transmission, as follows:

                                       7
<PAGE>
                Texas Gas

       Texas Gas Transmission Corporation
       3800 Frederica Street
       Post Office Box 20008
       Owensboro, Kentucky 42304

       Attention: Gas Revenue Accounting (Billings and Statements)
                  Marketing Administration (Other Matters)
                  Gas Transportation and Capacity Allocation (Nominations)
                  Fax (502) 688-6817

                Customer

       Mississippi Valley Gas Company
       711 West Capitol Street
       Jackson, Mississippi 39203

       Attention: Ms. Sheri W. Rowe

       The address of either party may, from time to time, be changed by a
party mailing, by certified or registered mail, appropriate notice thereof to
the other party. Furthermore, if applicable, certain notices shall be considered
duly delivered when posted to Texas Gas's Electronic Bulletin Board, as
specified in Texas Gas's Tariff.

11.3   Customer shall have fifteen (15) days from the date of receipt of this
Agreement in which to execute such Agreement or Customer's request may be deemed
null and void.

11.4   This Agreement shall be governed by the laws of the State of Kentucky.

11.5   Each party agrees to file timely all statements, notices, and petitions
required under the Commission's Regulations or any other applicable rules or
regulations of any governmental authority having jurisdiction hereunder and to
exercise due diligence to obtain all necessary governmental approvals required
for the implementation of this Transportation Agreement.

11.6   All terms and conditions of Rate Schedule NNS and the attached Exhibits
A, A-I, B, and C are hereby incorporated to and made a part of this Agreement.

11.7   This contract shall be binding upon and inure to the benefit of the
successors, assigns, and legal representatives of the parties hereto.

11.8   Neither party hereto shall assign this Agreement or any of its rights or
obligations hereunder without the consent in writing of the other party and
subject to the requirements of Section 25.7 of the General Terms and Conditions
of Texas Gas's tariff. Notwithstanding the foregoing, either party may assign
its right, title and interest in, to and by virtue of this Agreement including
any and all extensions, renewals, amendments, and supplements thereto, to a
trustee or trustees, individual or corporate, as security for bonds or other
obligations or securities, without such trustee or trustees assuming or becoming
in any respect obligated to perform any of the obligations of the assignor and,
if any such trustee be a corporation, without its being required by the parties
hereto to qualify to do business in the state in which the performance of this
Agreement may occur, nothing contained herein shall require consent to transfer
this Agreement by virtue of merger or consolidation of a party hereto or a sale
of all or substantially all of the assets of a party hereto, or any other
corporate reorganization of a party hereto.

11.9   This Agreement insofar as it is affected thereby, is subject to all valid
rules, regulations, and orders of all governmental authorities having
jurisdiction.

                                       8
<PAGE>

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

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
signed by their respective representatives thereunto duly authorized, on the day
and year first above written.

ATTEST:                             TEXAS GAS TRANSMISSION CORPORATION

/s/ SHERRY L. RICE                  By /s/ (ILLEGIBLE)
----------------------------          -----------------------------------------
  Asst. Secretary                                  Vice President

WITNESSES:                          MISSISSIPPI VALLEY GAS COMPANY

                                    By /s/ (ILLEGIBLE)
----------------------------          -----------------------------------------

                                    Attest /s/ (ILLEGIBLE)
----------------------------              -------------------------------------
                                                  _____ Secretary

Date of Execution by Customer:

30 Oct 97
----------------------------

                                       9

<PAGE>

                              CONTRACT NO. N000120

                                    EXHIBIT A
                            FIRM POINT(S) OF RECEIPT
                         MISSISSIPPI VALLEY GAS COMPANY
                          FIRM NO-NOTICE TRANSPORTATION
                                    AGREEMENT

<Table>
<Caption>
                                                                                          DAILY FIRM
                                        METER                                          CAPACITY (MMBtu)
LATERAL      SEGMENT            ZONE     NO.     NAME                                 WINTER      SUMMER
-------      -------            ----    -----    ----                                 ------      ------
<S>          <C>                <C>     <C>      <C>                                  <C>         <C>
BEGIN LIST OF FIRM RECEIPT POINTS
NORTH LOUISIANA LEG
      Carthage - Haughton
                                 1      2102     Champlin                                 0        2,500
      Sharon - East
                                 1     8760N     Lonewa (NLA)                             0            0
EAST LEG
      Bosco - Eunice
                                SL      2740     Superior-Pure                            0            0
SOUTHEAST LEG
      B1k. 8 - Morgan City
                                SL      2460     Peltex Deep Saline #1                    0            0
                                SL      2463     Toce Oil                                 0            0
                                SL      2638     Coon Point                               0            0
                                SL      2755     Texaco-Bay Junop                         0            0
      Henry - Lafayette
                                SL      2790     Henry Hub                            6,782        4,282
      Morgan City - Lafayette
                                SL      2454     FMP/Bayou Postillion                     0            0
                                SL      9173     ANR-Calumet (Rec.)                       0            0
SOUTH LEG
      Egan - Eunice
                                SL      9003     Egan                                     0            0
SOUTHWEST LEG
      Lowry - Eunice
                                SL      2437     ENOGEX/NGPL Tap Washita                  0            0
                                SL      9170     Transok/NGPL Inter #2 Custer             0            0
                                SL      9843     Mobil - Lowry                            0            0
WEST LEG
      Mallard Bay - Woodlawn
                                SL      2207     Franks Petroleum-Chalkley                0            0
MAINLINE
      Bastrop - North
                                 1      1631     MVG Allocation Point                 5,000        5,000
</Table>

EFFECTIVE DATE: July 1, 2000

<PAGE>

                              CONTRACT NO. N000120

                                    EXHIBIT A
                            FIRM POINT(S) OF RECEIPT
                         MISSISSIPPI VALLEY GAS COMPANY
                         FIRM NO-NOTICE TRANSPORTATION
                                    AGREEMENT

<Table>
<Caption>
                                                                                          DAILY FIRM
                                        METER                                          CAPACITY (MMBtu)
LATERAL      SEGMENT            ZONE     NO.     NAME                                 WINTER      SUMMER
-------      -------            ----    -----    ----                                 ------      ------
<S>          <C>                <C>     <C>      <C>                                  <C>         <C>
WC-294 (at ANR-Eunice)
      Included under Mainline

HIOS (at ANR-Eunice)
      Included under Mainline
                                                                                 End List of Firm Receipt Points.
</Table>

Note: 199 MMBtu/D at Henry (Meter No. 2790) available to Duck Hill (N015853),
until 10/30/2002.

EFFECTIVE DATE: July 1, 2000

<PAGE>

                                 EXHIBIT "A-I"
                          SECONDARY POINT(S) OF RECEIPT

<Table>
<Caption>
                                           TGT
                                          METER
LATERAL      SEGMENT            ZONE       NO.        DRN               SUPPLY POINT
-------      -------            ----      -----       ---               ------------
<S>          <C>                <C>       <C>         <C>               <C>
NORTH LOUISIANA
      Carthage-Haughton          1        2102      152451              Champlin
                                 1        9805       43336              Delhi
                                 1        9051        7148              Grigsby
                                 1        8116       42473              Texas Eastern-Sligo
                                 1        9884       49099              Valero-Carthage

      Haughton-Sharon            1        8003       43390              Barksdale
                                 1        2455       38387              Beacon
                                 1        9866       44088              Cornerstone-Ada
                                 1        2340        7787              F.E. Hargraves-Minden
                                 1        2186        7790              LGI#1
                                 1        2456        7046              McCormick
                                 1        2457        7788              Minden-Hunt
                                 1        2459       11259              Minden Pan-Am #1
                                 1        9819       43554              Nelson-Sibley
                                 1        9461       43555              Olin-McGoldrick
                                 1        2760       38250              Sligo Plant
                                 1        9834       49082              Texaco-Athens

      Sharon                     1        2145       38281              Claiborne
                                 1        9439      185980              Energy Management-Antioch
                                 1        2010        7795              Fina Oil-HICO
                                 1        9818        7739              PGC-Bodcaw
                                 1        2757        7792              Texas Eastern-Sharon

      Sharon-East                1        9418      171295              Associated-Calhoun
                                 1        2631       38310              Calhoun Plant
                                 1        2632       38300              Dubach
                                 1        2202      144066              Ergon-Monroe
                                 1        8760        9334              Lonewa
                                 1        8020        9217              MRT-Bastrop
                                 1        9302        9335              Munce
                                 1        9812       43556              Par Minerals/Downsville
                                 1        9823       43559              Reliance-Bernice
                                 1        2612       10799              Reliance-West Monroe
                                 1        2634        9339              Southwest-Guthrie

EAST
      Bosco-Eunice               SL       2015        6512              Amerada Hess
                                 SL       2016        6513              Amerada Hess-South Lewisburg
                                 SL       2385        6517              D.B. McClinton #1
                                 SL       2288        6508              Great Southern-Mowata #2
                                 SL       9804        6545              Great Southern-Mowata #3
                                 SL       8142        6549              Ritchie
                                 SL       2740        6499              Superior-Pure

</Table>

                                     A-I-1
<PAGE>

<Table>
<Caption>
                                           TGT
                                          METER
LATERAL      SEGMENT            ZONE       NO.        DRN            SUPPLY POINT
-------      -------            ----      -----       ---            ------------
<S>          <C>                <C>       <C>        <C>            <C>
SOUTHEAST
      Blk. 8-Morgan City         SL       2198        10590         Bois D'Arc
                                 SL       9142       140570         Bois D'Arc-Pelican Lake
                                 SL       2109        31917         Chevron-Block 8
                                 SL       2638        31567         Coon Point
                                 SL       2845        10533         Lake Pagie
                                 SL       2460        43557         Peltex Deep Saline #1
                                 SL       2480        31554         S.S. 41
                                 SL       9471        43569         Sohio
                                 SL       2755        10587         Texaco-Bay Junop
                                 SL       9836        10595         Texaco-Dog Lake
                                 SL       2463        43572         Toce Oil
                                 SL       9883        10591         Zeit-Lake Pagie

      Henry-Lafayette            SL       3190        10902         Faustina-Henry
                                 SL       2790        42612         Henry Hub

      Lafayette-Eunice           SL       2125         8741         California Co.-North Duson
                                 SL       2138         6500         California Co.-South Bosco #2
                                 SL       2339         8737         Duson
                                 SL       9837        43488         Excel-Judice
                                 SL       2601         8732         Fina Oil-Anslem Coulee
                                 SL       8040         6525         Florida
                                 SL       2290         6544         Gulf Transport-Church Pt.
                                 SL       9906        38741         Quintana-South Bosco
                                 SL       9005         6538         Rayne-Columbia Gulf
                                 SL       3067         8736         South Scott
                                 SL       2810         8738         Tidewater-North Duson
                                 SL       8051         8727         Youngsville

      Maurice-Freshwater         SL       9501       204880         Araxas-Abbeville
                                 SL       2147        10898         CNG-Hell Hole Bayou
                                 SL       2203        10890         Deck Oil-Perry/Hope
                                 SL       9160       140571         LLOG-Abbeville
                                 SL       2394        10906         LRC-Theall
                                 SL       9800        43550         May Petroleum
                                 SL       2748       127418         Parc Perdue
                                 SL       2749        10896         Parc Perdue 2
                                 SL       9830        43558         R&R Res-Abbeville
                                 SL       9434       171296         Southwestern-Perry
                                 SL       2706        40933         Sun Ray
                                 SL       9422       160243         UNOCAL-Freshwater Bayou
                                 SL       2840        10900         UNOCAL-N. Freshwater Bayou

      Morgan City-Lafayette      SL       2064        43425         Amoco-Charenton
                                 SL       9173        10277         ANR-Calumet (Rec.)
                                 SL       9803        38341         Atlantic
                                 SL       9809        43733         B.H. Petroleum-S.E. Avery
                                 SL       9881        80583         Bridgeline-Berwick
                                 SL       2085        10270         British American-Ramos
                                 SL       9412       185979         Equitable-Lake Peigneur
                                 SL       9047         8223         Florida Gas-E.B. Pigeon
                                 SL       2454         8215         FMP/Bayou Postillion

</Table>

                                     A-I-2
<PAGE>

<Table>
<Caption>
                                           TGT
                                          METER
LATERAL      SEGMENT            ZONE       NO.        DRN            SUPPLY POINT
-------      -------            ----      -----       ---            ------------
<S>          <C>                <C>       <C>       <C>            <C>
SOUTHEAST (CONT.)               SL        8059        10279        Franklin
                                SL        9437       171297        Hunt Oil-Taylor Point
                                SL        9502       211243        Hunt Oil-East Taylor Point
                                SL        9854        43546        Linder Oil-Bayou Penchant
                                SL        9853        60164        Linder Oil-Garden City
                                SL        2189        43561        Rutledge Deas
                                SL        2636         8240        Shell-Bayou Pigeon
                                SL        8149         8235        SONAT-East Bayou Pigeon
                                SL        2035        10264        Southwest-Jeanerette
                                SL        9895        59632        Texaco-Bayou Sale
                                SL        8205        10272        Transco-Myette Point
                                SL        9829        10263        Trunkline-Centerville

      Thibodaux-Morgan City
                                SL        2250        33435        A. Glassell-Chacahoula
                                SL        2335       186009        Amoco-North Rousseau
                                SL        2835         6912        Lake Palourde
                                SL        9873         8875        Linder Oil-Chacahoula
                                SL        9175       124990        LLOG-Chacahoula
                                SL        9847        43636        LRC-Choctaw
                                SL        2440         8877        Magna-Chacahoula #1
                                SL        2445         8878        Magna-St. John #2
                                SL        2470        60191        Patterson-Chacahoula
                                SL        2135        10145        Simon Pass
                                SL        9431       144064        Transco-Thibodaux

SOUTH
      Egan-Eunice               SL        9003        38233        Egan
                                SL        9415       171298        Tejas Power-Egan

SOUTHWEST
      East Cameron-Lowry        SL        2581        30074        E.C. 14
                                SL        2033        43548        Little Cheniere-Arco
                                SL        2034        43549        Little Cheniere-Linder
                                SL        2392         7561        LRC-Grand Cheniere

      Lowry-Eunice              SL        9843       156905        Mobil-Lowry
                                SL        9446         7530        NGPL-Lowry
                                SL        2437       149325        ENOGEX/NGPL Tap Washita
                                SL        9169       149326        TEX SW/NGPL Washita
                                SL        9171       149313        Transok/NGPL Inter #2 Beckham
                                SL        9170       149321        Transok/NGPL Inter #2 Custer
                                SL        9172       149329        Transok/NGPL Waggs Wheeler

WEST
      Iowa-Eunice               SL        9507        21777        Camex-China
                                SL        8170         8613        Iowa
                                SL        9445         8617        Kilroy Riseden-Woodlawn

      Mallard Bay-Woodlawn      SL        2140         8610        California Co.-South Thornwell
                                SL        2615         7585        Caroline Hunt Sands-S. Thornwell
                                SL        2207        60169        Franks Petroleum-Chalkley
                                SL        9028        43506        Gas Energy Development-Hayes
                                SL        2355        81054        Humble-Chalkley
                                SL        2383         7567        IMC Wintershall-Chalkley
</Table>

                                     A-I-3
<PAGE>
<Table>
<Caption>
                                           TGT
                                          Meter
Lateral      Segment            Zone       No.        DRN            Supply Point
-------      -------            ----      -----       ---            ------------
<S>          <C>                <C>       <C>        <C>            <C>
WEST (CONT.)                    SL        8071         7571          LRC-Mallard Bay
                                SL        9828         8585          Riverside-Lake Arthur
                                SL        2635       107453          Shell-Chalkley
                                SL        2822         7586          Superior-S. Thornwell
                                SL        2885         8603          Union Texas-Welsh

W.C. 294

      Entering at ANR-          SL        9026        29497          W.C. 167/132
       Eunice                   SL        9136        55151          W.C. 167/Near Shore
                                SL        9440       186036          W.C. 293/306A
                                SL        9396        60204          W.C. 293/H.I. 120/H.I. 120-128
                                SL        9383        43734          W.C. 293/H.I. 167/H.I. 167-166
                                SL        2838        29693          W.C. 294

HIOS
      Offshore Points                                                H.I. 247
       entering at ANR-Eunice   SL        2868        33213          H.I. A-247/A-244A/A-231
                                SL        9176       154807          H.I. A-247/A-245
                                SL        9135        41343          W.C. 167/HIOS Mainline

                                                                     H.I. 283
                                SL        9894        49103          H.I. A-283/A-283A
                                SL        9487       197839          H.I. A-283/A-443
                                SL        2855        33296          H.I. A-285/A-282

                                                                     H.I. 303
                                SL        2858        43524          H.I. A-302A/A-303

                                                                     H.I. 323
                                SL        9468        21334          H.I. A-323

                                                                     H.I. 343
                                SL        9467        21339          H.I. A-343/A-355

                                                                     H.I. A-345
                                SL        2863        33293          H.I. A-334A/A-335
                                SL        9327        43529          H.I. A-345/A-325A

                                                                     H.I. A-498
                                SL        2529       197837          H.I. A-498/A-451
                                SL        2536       197838          H.I. A-498/A-462/Various
                                SL        2534        60171          H.I. A-498/A-489
                                SL        2533        60173          H.I. A-498/A-489/A-474
                                SL        2535        60174          H.I. A-498/A-489/A-499
                                SL        9371        60175          H.I. A-498/A-490
                                SL        2856        43723          H.I. A-498/A-517

                                                                     H.I. A-539
                                SL        2537        60177          H.I. A-539/A-480
                                SL        9365        60178          H.I. A-539/A-511
                                SL        9508       216653          H.I. A-539/A-528
                                SL        9376        54856          H.I. A-539/A-532
                                SL        9328        60179          H.I. A-539/A-550
</Table>

                                     A-I-4
<PAGE>
<Table>
<Caption>
                                           TGT
                                          Meter
Lateral      Segment            Zone       No.        DRN            Supply Point
-------      -------            ----      -----       ---            ------------
<S>          <C>                <C>       <C>       <C>            <C>

HIOS (CONT.)                    SL        9901        81051          H.I. A-539/A-552/A-551
                                SL        9889        49104          H.I. A-539/A-552/A-553
                                SL        2539        60181          H.I. A-539/A-567
                                SL        9380        60182          H.I. A-539/A-568

                                                                     H.I. 546
                                SL        9466        21336          H.I. A-546/A-548/A-545

                                                                     H.I. A-555
                                SL        2857        36875          H.I. A-531A
                                SL        2861        43122          H.I. A-536C
                                SL        2862        43123          H.I. A-537B
                                SL        9127        54854          H.I. A-537B/A-537D/A-556
                                SL        9308        60183          H.I. A-555
                                SL        9125        54858          H.I. A-555/A-537D/A-556
                                SL        9887        49105          H.I. A-555/A-557A/A-556

                                                                     H.I. A-573
                                SL        9909        60369          H.I. A-573/A-384/G B 224
                                SL        2859        43531          H.I. A-573B Complex
                                SL        2542        43721          H.I. A-595CF Complex

                                                                     H.I. A-582
                                SL        9165       111967          H.I. A-582/A-561A
                                SL        9469       221329          H.I. A-582/A-563/A-564
                                SL        9470       221328          H.I. A-582/A-582C
                                SL        9133        49106          H.I. A-582/E.B. 110
                                SL        9377        49107          H.I. A-582/E.B. 160/Various
                                SL        9134        81052          H.I. A-582/E.B. 165

MAINLLNE
      Bastrop-North              3        8082         6463          ANR-Slaughters
                                 3        2061         4308          Bee-Hunter
                                 3        2072         6385          Blair
                                 4        1229       108797          Cincinnati Gas and Electric Co.
                                 3        1367       132995          Citizens Gas & Coke Utility
                                 2        8124        41187          Dyersburg
                                 1        9871       132993          Entergy-Helena
                                 3        9459       186011          Gibbs-Henderson
                                 3        9432       186010          Har-Ken/Austin Jennings #1
                                 3        9530         6461          Har-Ken/Murray
                                 1        9303         1484          Helena #2
                                 3        1440       108798          Indiana Gas Company, Inc.
                                 4        1433       140534          Indiana Utilities Corporation
                                 4        9522       223429          Indiana Utilities-New Albany Shale
                                 4        1489       132837          Lawrenceburg Gas Company
                                 4        1715        16281          Lebanon-Columbia
                                 4        1247        16283          Lebanon-Congas
                                 4        1859        16284          Lebanon-Texas Eastern
                                 3        9527        44100          Liberty-South Hill
                                 1        1600       132977          Memphis Light, Gas and Water Division
                                 3        8073         6134          Midwestern-Whitesville
                                 1        3801       134577          Pooling Receipt-Zone 1
</Table>

                                     A-I-5
<PAGE>
<Table>
<Caption>
                                           TGT
                                          Meter
Lateral      Segment            Zone       No.        DRN            Supply Point
-------      -------            ----      -----       ---            ------------
<S>          <C>                <C>       <C>       <C>            <C>

MAINLINE (CONT.)                 3        9525         6447          Pride Energy No. 1
                                 3        9141       107451          Reynolds-Narge Creek
                                 3        5800       128355          Slaughters-Storage Complex (Withdraw)
                                 3        1810       132845          Southern Indiana Gas and Electric Co.
                                 4        1872       125662          Union Light, Heat and Power Co.
                                 3        9404        40221          United Cities-Barnsley
                                 2        1885       132856          Western Kentucky Gas Company
                                 3        1906       108800          Western Kentucky Gas Company
                                 3        1912        21773          Western Kentucky Gas Company
                                 4        1981       132852          Western Kentucky Gas Company

      Eunice-Zone SL/1 Line     SL        9035         6519          ANR-Eunice
                                SL        9084       105453          Bayou Pompey
                                SL        8107         8120          Evangeline
                                SL        9536       225010          Louisiana Chalk-Eunice
                                SL        8046         8121          Mamou
                                SL        3800       124803          Pooling Receipt-Zone SL
                                SL        3900       154805          SL Lateral Terminus

      Zone SL/1 Line-Bastrop     1        2020        44085          Arkla-Perryville
                                 1        9870        44087          Channel Explo.-Chicksaw Creek
                                 1        9826         9332          Delhi-Ewing
                                 1        9882        60205          Entergy-Andrus Plant
                                 1        9785        12088          Entergy-Delta Plant
                                 1        2361         9321          Guffey-Millhaven
                                 1        9814        43538          Hogan-Davis Lake
                                 1        8063         9670          Pineville (LIG)
                                 1        2648         9214          Spears
                                 1        9832        43414          Wintershall-Clarks
</Table>

                                     A-I-6
<PAGE>
                               CONTRACT NO. N0120
                     Winter Contract Demand - 50,429 MMBtu/D
                     Summer Contract Demand - 5,000 MMBtu/D

                                   EXHIBIT "B"
                              POINT(S) OF DELIVERY
                                     ZONE I

<Table>
<Caption>
Meter                                                                                                    MAOP       MDP*
 No.       DRN            Name and Description                                         Facilities       (psig)     (psig)
-----     -----           --------------------                                         ----------       ------     ------
<S>       <C>             <C>                                                          <C>              <C>        <C>
1631      60206           Mississippi Valley Gas Company
                          BENOIT - S12, T20N, R8W, Bolivar County, MS                        (1)          600        300
                          BOLIVAR DISTRICT - S4, T22N, R6W, Bolivar
                          County, MS                                                         (1)          810        300
                          CLARKSDALE - S30, T27N, R3W, Coahoma
                          County, MS                                                         (1)          560        250
                          CLARKSDALE AIR BASE - S16, T28N, R3W,
                          Coahoma County, MS                                                 (1)          560        150
                          CLEVELAND - S10 T22N, R6W, Bolivar County, MS                      (1)          640        325
                          DESOTO DISTRICT - S23, T1S, R8W, DeSoto
                          County, MS                                                         (1)          674        400
                          DUNCAN - S11, T25N, R5W, Bolivar County, MS                        (1)          840        150
                          FEDERAL COMPRESS - S9, T5S, R11W, Tunica
                          County, MS                                                         (1)          486        200
                          GAY HILL - S29, T1S, R8W, DeSoto County, MS                        (1)          840        100
                          GREENBROOK - S24, T1S, R8W, DeSoto County, MS                      (1)          674        300
                          JONESTOWN - S4, T28N, R3W, Coahoma County, MS                      (1)          560        250
                          LAKE CORMORANT - S13, T25, R10W, DeSoto
                          County, MS                                                         (1)          500        150
                          LAKE CORMORANT #2 - S31, T2S, R9W, DeSoto
                          County, MS                                                         (1)          810        400
                          LULA - S25, T30N, R3W, Coahoma County, MS                          (1)          500        150
                          LYNCHBURG - S36, T1S, R9W, DeSoto County. MS                       (1)          840        100
                          LYON - S17, T27N, R3W, Coahoma County, MS                          (1)          640        325
                          MERIGOLD NO. 1 - S9, T23N, R5W, Bolivar
                          County, MS                                                         (1)          640        150
                          MERIGOLD NO. 2 - S9, T23N, R5W, Bolivar
                          County, MS                                                         (1)          640        250
                          MVG-GREENVILLE AIR BASE - S22, T19N, R8W
                          Washington County, MS                                              (1)          600        300
                          MVG-GREENVILLE #1 - S12, T18N, R8W,
                          Washington County, MS                                              (1)          640        300
                          MVG-GREENVILLE #3 - S24, T18N, R8W,
                          Washington County, MS                                              (1)          840        575
                          MVG-GREENVILLE #4 - S14, T17N, R9W,
                          Washington County, MS                                              (1)          672        250
                          MVG-HARDY SPRINGS - Grenada County, MS                             (1)
                          NATIONAL PACKING - S14, T17N, R9W,                                 (1)          672        150
</Table>

                                       B-1

NOTE:    SEE ATTACHED STANDARD FACILITIES KEY FOR EXPLANATION OF FACILITIES.
         *MINIMUM DELIVERY PRESSURE

<PAGE>
<Table>
<Caption>
Meter                                                                                                    MAOP       MDP*
 No.       DRN            Name and Description                                         Facilities       (psig)     (psig)
-----     -----           --------------------                                         ----------       ------     ------
<S>       <C>             <C>                                                          <C>              <C>        <C>
                          Washington County, MS
                          NORTH TUNICA - S27, T4S, R11W, Tunica
                          County, MS                                                         (1)                      325
                          REFUGE PLANTING - S11, T18N, R8W, Washington
                          County, MS                                                         (1)          672         150
                          ROBINSONVILLE - S18, T3S, R10W, Tunica
                          County, MS                                                         (1)          486         325
                          RURAL-MS-MVG                                                                                 50
                          SCOTT - S26, T20N, R8W, Bolivar County, MS                         (1)          600         150
                          SHELBY - S8, T24N, R5W, Bolivar County, MS                         (1)          840         150
                          TUNICA - S4, T5S, R11W, Tunica County, MS                          (1)          500         150
                          VINEY RIDGE ROAD - S10, T26N, R4W,
                          Coahoma County, MS
                          WALLS - S33, T1S, R9W, DeSoto County, MS                           (1)          417         150
</Table>

                                       B-2

NOTE:    SEE ATTACHED STANDARD FACILITIES KEY FOR EXPLANATION OF FACILITIES.
         *MINIMUM DELIVERY PRESSURE

<PAGE>
                          -----------------------------
                              CONTRACT NO. N000120
                          -----------------------------
                          FIRM NO-NOTICE TRANSPORTATION
                                    AGREEMENT
                                    EXHIBIT C
                             SUPPLY LATERAL CAPACITY

                         MISSISSIPPI VALLEY GAS COMPANY

<Table>
<Caption>
                                                              PREFERENTIAL RIGHTS
                                                                    MMBTU/D
              SUPPLY LATERAL                                WINTER            SUMMER
                                                            ------            ------
<S>                                                         <C>               <C>
        Zone 1 Supply Lateral(s)

        North Louisiana Leg:                                     0             2,500
                                                            ------            ------
                Total Zone 1:                                    0             2,500

        Zone SL Supply Lateral(s)

        East Leg:                                                0                 0

        Southeast Leg:                                       6,782             4,282

        South Leg:                                               0                 0

        Southwest Leg:                                           0                 0

        West Leg:                                                0                 0

        WC-294 (at ANR-Eunice):                                  0                 0

        HIOS (at ANR-Eunice):                                    0                 0
                                                            ------            ------
                Total Zone SL:                               6,782             4,282
                                                            ------            ------
                Grand Total:                                 6,782             6,782
                                                            ======            ======
</Table>

NOTE: QUANTITIES SHOWN INCLUDE 199 MMBTU/D ON THE SOUTHEAST LATERAL RELEASED TO
DUCK HILL (N15853) UNTIL 10/30/2002.

EFFECTIVE DATE: July 1, 2000

<PAGE>

                             STANDARD FACILITIES KEY

(1)      Measurement facilities are owned, operated, and maintained by Texas Gas
         Transmission Corporation.

(2)      Measurement facilities are owned, operated, and maintained by ANR
         Pipeline Company.

(3)      Measurement facilities are owned, operated, and maintained by Arkansas
         Louisiana Gas Company.

(4)      Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Kerr-McGee Corporation.

(5)      Measurement facilities are owned, operated, and maintained by Koch
         Gateway Pipeline Company.

(6)      Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Delhi Gas Pipeline Corporation.

(7)      Measurement facilities are owned, operated, and maintained by
         Kerr-McGee Corporation.

(8)      Measurement facilities are owned, operated, and maintained by Louisiana
         Intrastate Gas Corporation.

(9)      Measurement facilities are owned, operated, and maintained by Trunkline
         Gas Company.

(10)     Measurement facilities are owned, operated, and maintained by Columbia
         Gulf Transmission Company.

(11)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Columbia Gulf Transmission Company.

(12)     Measurement facilities are owned, operated, and maintained by Florida
         Gas Transmission Company.

(13)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by ANR Pipeline Company.

(14)     Measurement facilities are owned by Champlin Petroleum Company and
         operated and maintained by ANR Pipeline Company.

(15)     Measurement facilities are owned by Transcontinental Gas Pipe Line
         Corporation and operated and maintained by ANR Pipeline Company.

(16)     Measurement facilities are jointly owned by others and operated and
         maintained by ANR Pipeline Company.

(17)     Measurement facilities are owned by Koch Gateway Pipeline Company and
         operated and maintained by ANR Pipeline Company.

(18)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Texas Eastern Transmission Corporation.

(19)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Natural Gas Pipeline Company of America.

(20)     Measurement facilities are owned by Louisiana Intrastate Gas
         Corporation and operated and maintained by Texas Gas Transmission
         Corporation.

(21)     Measurement facilities are owned, operated, and maintained by Texas
         Eastern Transmission Corporation.

<PAGE>
(22)     Measurement facilities are owned by Kerr-McGee Corporation and operated
         and maintained by ANR Pipeline Company.

(23)     Measurement facilities are operated and maintained by ANR Pipeline
         Company.

(24)     Measurement facilities are owned, operated, and maintained by
         Transcontinental Gas Pipe Line Corporation.

(25)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Tennessee Gas Pipeline Company.

(26)     Measurement facilities are owned, operated, and maintained by Northern
         Natural Gas Company.

(27)     Measurement facilities are owned and maintained by Faustina Pipeline
         Company and operated by Texas Gas Transmission Corporation.

(28)     Measurement facilities are owned by Samedan and operated and maintained
         by ANR Pipeline Company.

(29)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by CNG Producing.

(30)     Measurement facilities are owned, operated, and maintained by Devon
         Energy Corporation.

(31)     Measurement facilities are owned by Total Minatome Corporation and
         operated and maintained by Texas Gas Transmission Corporation.

(32)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Trunkline Gas Company.

(33)     Measurement facilities are owned by Linder Oil Company and operated and
         maintained by Texas Gas Transmission Corporation.

(34)     Measurement facilities are owned, operated, and maintained by
         Mississippi River Transmission Corporation.

(35)     Measurement facilities are owned, operated, and maintained by Texaco
         Inc.

(36)     Measurement facilities are owned by Texas Gas Transmission Corporation
         and operated and maintained by Louisiana Resources Company.

(37)     Measurement facilities are owned, operated, and maintained by Louisiana
         Resources Company.

(38)     Measurement facilities are owned by Oklahoma Gas Pipeline Company and
         operated and maintained by ANR Pipeline Company.

(39)     Measurement and interconnecting pipeline facilities are owned and
         maintained by Louisiana Resources Company. The measurement facilities
         are operated and flow controlled by Texas Gas Transmission Corporation.

(40)     Measurement facilities are owned by Hall-Houston and operated and
         maintained by ANR Pipeline Company.

(41)     Measurement facilities are owned, operated, and maintained as specified
         in Exhibit "B".

<PAGE>
(42)     Measurement facilities are owned by Enron Corporation and operated and
         maintained by Texas Gas Transmission Corporation.

(43)     Measurement facilities are owned by United Cities Gas Company and
         operated and maintained by TXG Engineering, Inc.

(44)     Measurement facilities are owned, operated, and maintained by NorAm Gas
         Transmission Company.

(45)     Measurement facilities are owned by Falcon Seaboard Gas Company and
         operated and maintained by Texas Gas Transmission Corporation.

(46)     Measurement facilities are owned by ANR Pipeline Company and operated
         and maintained by High Island Offshore System.

(47)     Measurement facilities are owned by Forest Oil Corporation, et al., and
         operated and maintained by Tenneco Gas Transportation Company.

(48)     Measurement facilities are owned by PSI, Inc., and operated and
         maintained by ANR Pipeline Company.

(49)     Measurement facilities are owned, operated, and maintained by Tennessee
         Gas Pipeline Company.

(50)     Measurement facilities are owned, operated, and maintained by Colorado
         Interstate Gas Company.

(51)     Measurement facilities are owned by Producer's Gas Company and operated
         and maintained by Natural Gas Pipeline Company of America.

(52)     Measurement facilities are owned by Zapata Exploration and operated and
         maintained by ANR Pipeline Company.

(53)     Measurement facilities are jointly owned by Amoco, Mobil, and Union;
         operated and maintained by ANR Pipeline Company.

(54)     Measurement facilities are owned, operated, and maintained by VHC Gas
         Systems, L.P.

(55)     Measurement facilities are owned by Walter Oil and Gas and operated and
         maintained by Columbia Gulf Transmission Company.

(56)     Measurement facilities are operated and maintained by Natural Gas
         Pipeline Company of America.

(57)     Measurement facilities are operated and maintained by Texas Gas
         Transmission Corporation.

(58)     Measurement facilities are operated and maintained by Tennessee Gas
         Pipeline Company.

(59)     Measurement facilities are operated and maintained by Columbia Gulf
         Transmission Company.

(60)     Measurement facilities are owned, operated, and maintained by
         Midwestern Gas Transmission Company.

(61)     Measurement facilities are owned, operated, and maintained by Western
         Kentucky Gas Company.

(62)     Measurement facilities are owned by Egan Hub Partners, L. P., and
         operated and maintained by Texas Gas Transmission Corporation.

(63)     Measurement facilities are owned and maintained by Louisiana Chalk
         Gathering System and operated by Texas Gas Transmission Corporation.<PAGE>

                                                                EXHIBIT 10.13(h)

                                                                   HATTIESBURG-A

                             200,000 SUBSCRIBED IN
                                    PHASE I.

                                  FIRM STANDBY

                              GAS STORAGE CONTRACT

                                 BY AND BETWEEN

                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY

                                       AND

                         MISSISSIPPI VALLEY GAS COMPANY

                                    EFFECTIVE

                                FEBRUARY 21, 1990

                                     PART A*

*   This Contract for 200,000 MQS ("Part A") is issued, together with a second
    contract for 100,000 MQS ("Part B"), in replacement of the original Firm
    Standby Gas Storage Contract for 300,000 MQS dated February 21, 1990.

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                 FIRM STANDBY GAS STORAGE CONTRACT
<S>                                                                                                              <C>
I.       ACQUISITION AND CONSTRUCTION  ..................................................................         2

II.      GAS TO BE STORED AND DELIVERED..................................................................         4

III.     SCHEDULING......................................................................................         6

IV.      POINT(S) OF DELIVERY AND REDELIVERY ............................................................         8

V.       TERM............................................................................................         8

VI.      RATES...........................................................................................         9

VII.     NOTICES.........................................................................................        13

VIII.    GENERAL TERMS AND CONDITIONS....................................................................        15

IX.      ADDITIONAL STORAGE OPTION.......................................................................        15

X.       MISCELLANEOUS...................................................................................        16

                                                             Exhibit "A"
                                                    General Terms and Conditions

I.       DEFINITIONS.....................................................................................         1

II.      QUALITY.........................................................................................         3

III.     PRESSURE .......................................................................................         4

IV.      TITLE AND RISK OF LOSS..........................................................................         4

V.       MEASUREMENT.....................................................................................         6

VI.      BILLINGS AND PAYMENTS...........................................................................         9

VII.     TAXES..........................................................................................         10

VIII.    REGULATORY BODIES...............................................................................        13

IX.      FORCE MAJEURE...................................................................................        14

X.       DEFAULT AND TERMINATION.........................................................................        16

                                                             Exhibit "B"
                                                 Point(s) of Delivery and Redelivery
</TABLE>

<PAGE>

                              GAS STORAGE CONTRACT

         THIS GAS STORAGE CONTRACT (hereinafter referred to as the "Contract")
is made effective as of the 21st day of February, 1990, by and between
HATTIESBURG INDUSTRIAL GAS SALES COMPANY, a Delaware corporation, (f/k/a Endevco
Industrial Gas Sales Company) (herein referred to as "Company"), operator of the
Storage Facilities (as defined below) and managing general partner of the
Hattiesburg Gas Storage Company, the owner of the said Storage Facilities, and
MISSISSIPPI VALLEY GAS COMPANY, a Mississippi corporation (herein referred to as
"Customer").

                              W I T N E S S E T H:

         WHEREAS, Company and Customer are parties to a "Precedent Agreement"
dated October 13, 1989, wherein Company and Customer agreed, upon the
satisfaction of certain conditions, to enter into this Contract; and

         WHEREAS, the conditions in the Precedent Agreement have been satisfied
or waived; and

         WHEREAS, subject to the terms hereof, Company will acquire certain
caverns located near Petal, Mississippi and develop such caverns into
underground natural gas storage facilities (hereinafter referred to as the
"Storage Facilities") initially having a usable storage capacity of
approximately two billion cubic feet ("Phase I"), and which may, at Company's
discretion, subsequently be expanded to a capacity of approximately five billion
cubic feet of usable storage capacity ("Phase II"); and

<PAGE>

         WHEREAS, Company will install and construct all facilities necessary to
connect the Storage Facilities with the Point(s) of Delivery and Point(s) of
Redelivery herein specified; and

         WHEREAS, Customer desires that Company receive, on a firm basis, at the
Points of Delivery herein specified, certain quantities of gas from the pipeline
facilities of Transcontinental Gas Pipe Line Corporation ("Transco") and/or
Tennessee Gas Pipeline Company ("Tennessee") for the purpose of injecting and
storing such gas for Customer or for its account in such Storage Facilities, and
that Company redeliver such gas, on a firm basis, into the facilities of said
pipeline companies, at the Points of Redelivery herein specified; and

         WHEREAS, Company desires to perform such services for Customer, all to
be provided pursuant and subject to the terms and conditions hereof;

         NOW, THEREFORE, for and in consideration of the mutual covenants herein
contained, together with other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged and confessed by both parties
hereto, Company and Customer hereby agree as follows:

                                    ARTICLE I

                          ACQUISITION AND CONSTRUCTION

         Within thirty (30) days after the execution hereof, Company shall
endeavor to close its purchase of the Storage Facilities, on terms and
conditions satisfactory to Company. Thereafter, Company shall commence the
construction and development of the Storage Facilities and shall provide
Customer written notice of the

                                        2

<PAGE>

commencement of construction and the date upon which Company anticipates that
such facilities will be operational. Upon completion of construction, including
testing, as required by all applicable federal, state and/or applicable codes,
and all other matters required for operation, Company shall provide Customer
written notice that said facilities are fully operational and shall state in
such notice a date upon which Company will be ready to receive gas for storage,
which date shall be not less than thirty (30) days following such notice (such
date to be hereinafter referred to as the "Commencement Date"). If the
Commencement Date does not occur on or before December 1, 1990, or such later
date as may be agreed upon, (subject to a day for day extension for delays
caused by an event(s) of "force majeure" as herein defined and for each day
after March 8, 1990 which expires prior to the date that Company receives
executed Firm Storage Contracts covering at least 165,000 MMBtu of MDWQ, as
herein defined), for any reason, including, without limitation, Company's
inability to close its purchase of the Storage Facilities on terms acceptable to
Company, then either party shall have the right to terminate this Contract,
without further liability or obligation to the other party hereunder, by
providing the other party thirty (30) days prior written notice. Notwithstanding
the foregoing, in the event that Customer gives notice of termination in
accordance with the above and, thereafter, Company provides written notice to
Customer stating a Commencement Date which will occur prior to the expiration of
such thirty (30) day period, then, Customer's notice of termination shall be
void and of no further force or effect and

                                        3

<PAGE>

this Contract shall continue in accordance with its terms, unless Company is
unable to commence service on the Commencement Date stated in its notice.

                                   ARTICLE II

                         GAS TO BE STORED AND DELIVERED

         2.1      Subject to the terms and provisions of this Contract, Company
agrees to reserve for service to Customer a portion of the Storage Facilities.
The capacities so reserved for Customer shall be sufficient to enable Customer
to inject gas into, withdraw gas from, and store gas in the Storage Facilities,
in quantities up to the maximum quantities set forth below:

         (i)      a maximum daily withdrawal quantity ("MDWQ") of 20,000 MMBtu
                  per day;

         (ii)     a maximum daily injection quantity ("MDIQ") of 10,000 MMBtu
                  per day;

         (iii)    a maximum capacity in the Storage Facilities ("MQS") equal to
                  200,000 MMBtu.

         2.2      Customer shall tender or cause to be tendered to Company at
the Point(s) of Delivery any gas which Customer desires to have injected into
storage hereunder. Customer shall also receive or cause to be received gas
requested to be withdrawn from storage at the Point(s) of Redelivery upon tender
for redelivery by Company.

         2.3      Subject to the operating conditions of the pipelines
delivering or receiving gas for Customer's account, Company shall receive gas
for injection from Customer at the Point(s) of Delivery and redeliver gas to
Customer at the Point(s) of Redelivery as scheduled by Customer from time to
time; provided that Company

                                        4

<PAGE>

shall not be obligated to receive for injection any quantity of gas if the
injection of the same would cause the quantity of gas stored in the Storage
Facilities for Customer's account ("Customer's Gas Storage Inventory") to exceed
Customer's MQS as stated above; nor shall Company be obligated at any time to
deliver more gas to Customer than Customer has in its then-current Customer's
Gas Storage Inventory.

         2.4      Company shall not be obligated to receive, at any Point of
Delivery for injection, or to redeliver, at any Point of Redelivery, any
quantity of gas when the quantity of gas tendered for delivery to Company or
requested by Customer to be redelivered, together with all other volumes of gas
tendered for delivery to Company at any such Point of Delivery, or requested for
redelivery at such Point of Redelivery, is less than 5,000 MMBtu per day in the
aggregate.

         2.5      In addition to the maximum daily rates of injection and
withdrawal as specified above in Section 2.1, Company shall use its best efforts
to accommodate requests of Customer to inject or withdraw gas at greater rates
of flow and, at such Point(s) of Delivery or Point(s) or Redelivery in addition
to those specified on Exhibit "B" annexed hereto, at such times as such
additional capacities are not required for service to other firm, standby
storage customers. Any such additional services shall be provided at the rates
stated in Section 6.1(c) and 6.1(d), as may be amended by Section 6.1(e), only
as capacities are available and on a prorata basis to other firm, standby
storage customers, without obligation or liability for interruption by Company
as to any

                                        5

<PAGE>

withdrawals or injections in excess of the maximums reserved for Customer.
Additional withdrawals and/or injections will be made only to the extent that
Customer has gas in storage to be withdrawn, or unfilled capacity in the Storage
Facilities reserved as part of Customer's MQS as stated herein.

                                   ARTICLE III

                                   SCHEDULING

         3.1      At any time during any day when Customer desires Company to
receive and inject gas into, or to withdraw and deliver gas from, the Storage
Facilities, Customer shall give verbal notice in accordance with Section 3.2 of
this Article to Company's dispatcher, specifying the quantity of gas to be
injected or withdrawn and the appropriate Points of Delivery or Points of
Redelivery, as applicable. Customer shall make available and tender any gas to
be injected hereunder and receive and accept delivery, upon tender by Company,
any gas requested to be withdrawn from storage. The quantity of gas stored in
the Storage Facilities for the account of Customer shall be increased or
decreased upon injection or withdrawal of gas from storage, as applicable.
Customer shall not (unless otherwise agreed by Company), on an hourly basis,
tender for injection nor shall Company be obligated to receive gas for injection
or to withdraw and deliver gas from storage, at rates of flow in excess of 1/24
of Customer's MDIQ or MDWQ, respectively.

         3.2      Customer shall notify Company at least eight (8) hours in
advance of any requested change in the daily or hourly rate of flow for
injections or withdrawals of gas hereunder. Company may waive

                                        6

<PAGE>

any part of the eight (8) hour notice upon request if, in Company's reasonable
judgement, operating conditions permit such waiver. Customer shall notify
Company immediately of any circumstance which causes or will cause the
deliveries to or receipts from Company to be different from those requested.
Notices provided in this Article may be verbal, followed by a written
confirmation delivered via telecopy, overnight mail, first class U.S. mail, or
hand-delivery when such written confirmation is requested by either party.
Customer shall provide notice of any changes in deliveries to or receipts from
Company to all applicable transporting pipelines and shall be responsible for,
and shall indemnify and hold Company harmless from, any and all liabilities and
expenses resulting from Customer's failure to notify all applicable transporting
pipelines of any such changes.

         3.3      In the event that an imbalance occurs on the pipeline to or
from which such gas is delivered or received, which imbalance results from
Company's failure to tender the quantities of gas scheduled for delivery from
storage, or accept delivery of the quantities of gas scheduled for injection
into storage and tendered for delivery by Customer, all in accordance with and
subject to this Contract, Company shall reimburse Customer for any imbalance
penalty due and rightfully owing to the pipeline receiving or delivering the gas
at such Point(s) of Delivery or Point(s) of Redelivery, which was caused by
Company's failure to accept or deliver gas. In the event that Company is unable
to receive or deliver gas as required by this Contract and in accordance with
the request of Customer as provided above, Company shall notify

                                        7

<PAGE>

Customer as soon as practicable following any failure to receive or tender such
gas and, Customer shall, as soon as practicable following receipt of such
notice, notify and change nominations and scheduling with all pipelines and
other parties delivering or receiving gas to be delivered to or withdrawn from
storage for Customer and be reasonably diligent in taking such further actions
to prevent or minimize any imbalances from occurring. Customer and Company will
diligently work to correct any imbalance so caused prior to the end of the
applicable balancing period.

                                   ARTICLE IV

                       POINT(S) OF DELIVERY AND REDELIVERY

         4.1      The Point(s) of Delivery for all gas to be tendered by
Customer to Company for injection into the Storage Facilities shall be as
specified on Exhibit "B" attached hereto, and the maximum daily quantity of gas
which Company is obligated to receive from Customer at each individual Point of
Delivery shall not exceed the maximum stated thereon.

         4.2      The Point(s) of Redelivery for all gas to be tendered by
Company to Customer for redelivery pursuant to the terms hereof shall be as
specified on Exhibit "B", attached hereto, and the maximum quantities of gas
which Company is obligated to redeliver to Customer at each such Point of
Redelivery shall not exceed the maximum stated thereon.

                                    ARTICLE V

                                      TERM

         5.1      This Contract shall be effective as of the date set forth at
the outset hereof and shall continue in full force and effect

                                        8

<PAGE>

for a primary term of fifteen (15) years following the Commencement Date, as
defined in Article I hereof, and year to year thereafter unless and until
terminated effective at the end of such fifteenth (15th) year or any year
thereafter by either party upon not less than thirty-six (36) months prior
written notice.

         5.2      Upon expiration hereof, Company agrees that in the event that
gas storage services are still being provided in the Storage Facilities by
Company, or any assignee of Company as provided for herein, to other customers,
then, Customer shall have the right and option to continue to receive storage
services from Company, or such assignee of Company, pursuant to terms and
conditions, and for rates and charges substantially similar to those being
offered to said other customers by Company, or such assignee of Company, at the
time of such expiration.

                                   ARTICLE VI

                                      RATES

         6.1      During the first ten (10) years following the Commencement
Date, Customer shall pay to Company each month the following charges:

                  6.1(a)   A storage charge ("D(1)") of twenty and one-half
         cents ($0.205) multiplied by Customer's MQS amount specified
         in this Agreement; plus

                  6.1(b)   A deliverability charge ("D(2)") of fifty-eight cents
         ($0.58) multiplied by Customer's MDWQ amount; plus

                  6.1(c)   One cent ($0.01) for each MMBtu of gas received by
         Company for injection into storage hereunder and one cent

                                        9

<PAGE>

         ($0.01) for each MMBtu of gas redelivered by Company to Customer
         hereunder; plus

                  6.1(d)   Customer's pro-rata share of the cost of gas consumed
         in the operation of the Storage Facilities, such to be pro rated among
         all Customers based upon the quantities of gas injected and withdrawn
         by each Customer during each month. It is presently estimated that the
         total cost of gas to be consumed in the injection and withdrawal of gas
         into and from the Storage Facilities will initially total approximately
         three cents ($0.03) per MMBtu, in the aggregate; however, the parties
         agree that this cost may change from time to time and Customer shall
         continue to bear its pro rata share of such cost. Company shall
         endeavor to operate the Storage Facilities in an efficient manner so as
         to limit the gas consumed to that quantity reasonably required. Each
         month, Company shall provide Customer a statement showing its prorata
         share of such quantity and the cost of the gas consumed in the
         operation of Storage Facilities, along with the necessary supporting
         workpapers showing the total quantity and cost of gas so consumed and
         the proration calculations. Customer shall have the option, exercisable
         upon thirty (30) days prior written notice at any time during the term
         hereof, to thereafter (during the term hereof) supply its pro-rata
         share of gas consumed, as opposed to reimbursing Company in accordance
         herewith. In the event that Customer elects to provide its pro-rata
         share of the fuel used hereunder, then, following such election,
         Company shall establish and maintain

                                       10

<PAGE>

         an account (the "Fuel Account") with Customer. Initially, one and
         one-half percent (1 1/2%) of all gas delivered to Company at the Points
         of Delivery hereunder shall be retained by Company and credited to the
         Fuel Account. Customer shall not pay any injection, withdrawal or
         storage fee as to any volumes retained by Company. At the close of each
         month, Company shall debit the Fuel Account with Customer's pro-rata
         share of the fuel gas. From time to time during the term hereof,
         Company shall have the right, upon providing Customer ten (10) days'
         prior written notice, to adjust the quantity of gas to be retained by
         Company and credited to the Fuel Account in order to reflect actual
         quantities of gas consumed in the operation of the Storage Facilities
         and, to cause the Fuel Account to be as near to zero as is practicable
         on a monthly basis. Within thirty (30) days following the termination
         hereof, Company shall deliver gas to Customer, or Customer shall
         deliver gas to Company, as is necessary to cause the Fuel Account to
         equal zero. Company shall report the status of the Fuel Account as of
         the end of the previous month with each monthly statement. Customer
         shall have the right to deliver to Company the maximum capacities set
         forth in Section 2.1(iii) in addition to the gas delivered by Customer
         for credit to the Fuel Account.

                  6.1(e)   The fees payable for each MMBtu of gas delivered to
         Company for injection and for each MMBtu of gas redelivered to Customer
         hereunder, as provided for in section 6.1(c), shall be subject to
         adjustment, upon

                                       11

<PAGE>

         application to and approval by the appropriate regulatory commission,
         to reflect increases or decreases in the cost of maintenance, supplies
         and other variable expenses incurred by Company in performing the
         services hereunder. Customer shall have the right to contest any
         increase sought hereunder before the appropriate regulatory commission.
         No such adjusted fee shall exceed, however: (i) the fee herein
         provided; multiplied by (ii) the sum of one (1) plus the percentage
         change in the Gross National Product Implicit Price Deflator (the
         "Index") for the December of the then-current calendar year as compared
         to such Index for December, 1990.

         6.2      Notwithstanding the above, in the event that Company elects to
expand the Storage Facilities as referenced in section 9.1, the rates and
charges payable hereunder during the remaining portion of the initial ten (10)
years hereof shall be redetermined such that the sum of: (a) the D(1) storage
charge, as provided in section 6.1(a); and (b) the D(2) deliverability charge,
as provided in section 6.1(b); will be reduced such that the total reservation
charges payable hereunder during each month shall not exceed eighty percent
(80%) of the total reservation charges payable hereunder prior to such expansion
and rate redetermination.

         6.3      The charges payable hereunder for the remainder of the term
hereof following the tenth (10th) year (after the Commencement Date) may be
redetermined by the appropriate regulatory body in accordance with this section
6.3. Company shall have the right, upon its election, or shall be obligated,
upon request of Customer, to submit cost-of-service information to the
appropriate regulatory

                                       12

<PAGE>

authority for a review of the rates charged hereunder and to request a
determination by such regulatory authority of a rate for the remaining term
hereof. Customer shall have the right to take part in such proceedings and to
contest the proposed rates to the full extent allowed. Company shall provide
Customer not less than thirty (30) days prior written notice of Company's intent
to file for a new rate as herein provided. In the event that the rates resulting
from such redetermination are in excess of one hundred and ten percent (110%) of
the rates specified in Section 6.1, then Customer shall have the right to
terminate this Contract upon sixty (60) days' prior written notice; provided,
however, that during such sixty (60) day period following the receipt of
Customer's notice, Company shall have the option, without obligation, to agree
to charge Customer rates which do not exceed one hundred and ten percent (110%)
of the rates set forth in Section 6.1 and, in such event, this Contract shall
continue for the remaining term. Company shall provide Customer written notice
of any such election before the expiration of said sixty (60) day period and,
shall therein specify the rate to be charged hereunder.

                                   ARTICLE VII

                                     NOTICES

         7.1      Whenever any notice, request, demand, statement or payment is
required or permitted to be given under any provision of this Contract, unless
expressly provided otherwise, such shall be in writing, signed by or on behalf
of the person giving the same, and shall be deemed to have been given and
received upon the

                                       13

<PAGE>

actual receipt (including the receipt of a telecopy or facsimile of such notice)
at the address of the parties as follows:

         Company;

         For Notices:      Hattiesburg Industrial Gas Sales Company
                           5950 Berkshire Lane
                           Suite 1400, L.B. 17
                           Dallas, Texas 75225

         Payments
         (Wire Transfer):  Union Bank of California -- Los Angeles
                           ABA # 122000496
                           For Account of Hattiesburg Gas Storage Company
                           Acct No. 0880411845

         Customer:         Mississippi Valley Gas Company
                           711 W. Capital Street
                           Jackson, Mississippi 39203

         7.2      Operating communications made by telephone or other mutually
agreeable means shall be confirmed in writing or by telecopy within two (2) days
following same if requested by either party. To facilitate such operating
communications on a daily basis, lists of names, telephone and telecopy numbers
of appropriate operating personnel shall be exchanged by and between Company and
Customer before commencement of service under this Contract. Such lists shall be
updated from time to time if changed.

         7.3      The addresses of the parties may be revised upon written
notice given in accordance herewith, designating in such writing the new address
of the party so affected.

                                       14

<PAGE>

                                  ARTICLE VIII

                          GENERAL TERMS AND CONDITIONS

         The General Terms and Conditions attached hereto as Exhibit "A" are
hereby incorporated herein and made a part of this Contract as if fully set
forth herein. Any conflict or inconsistency, either in construction or
interpretation, between the terms hereof and the General Terms and Conditions
attached hereto shall be resolved in favor of the terms hereof.

                                   ARTICLE IX

                            ADDITIONAL STORAGE OPTION

         9.1      Company anticipates that it may elect to expand the Storage
Facilities at some time following initial storage operations. In the event that
Company so elects to expand the Storage Facilities, Company hereby grants
Customer an option on a pro rata portion of any increased capacities (for
storage, withdrawal or injection) developed by Company in the Storage
Facilities. Such proportionate share shall equal (i) the total additional
capacity (for storage, withdrawal or injection) developed by Company in such
Storage Facilities multiplied by (ii) a fraction, the numerator of which shall
equal Customer's rights to such capacity hereunder (MQS, MDWQ or MDIQ) and the
denominator of which shall equal the total storage capacity (for storage,
withdrawal or injection) of the Storage Facilities immediately preceding such
increase in capacity. Customer shall exercise its option, if at all, in
accordance with section 9.2 below.

                                       15

<PAGE>

         9.2      In the event that Company makes the determination to increase
any capacity (for storage, withdrawal or injection) at the Storage Facilities,
Company shall so notify Customer in writing. Such notice shall contain the terms
and conditions upon which Company will contract with other parties for such
capacity(ies), which terms shall be similar to those provided in this Contract.
For ninety (90) days following receipt of such notice, Customer shall have the
right, without obligation, to contract for additional storage rights in the
Storage Facilities upon the terms and conditions offered by Company and
reflected in the notice or such other terms as may be agreed to by Customer and
Company. Should Customer elect to contract for such additional rights, and
provide Company with written notice of such election within such ninety (90) day
period, Company shall provide Customer with formal contracts for execution. The
failure of Customer to provide written notice to Company of its election to
contract for such additional capacity rights within such ninety (90) day period,
or the failure of Customer, following such election, to execute and return to
Company the contract provided to Customer within thirty (30) days following
Customer's receipt of same, shall be deemed a waiver of Customer's option on
such capacity(ies).

                                    ARTICLE X

                                  MISCELLANEOUS

         10.1     Headings. The subject headings of the articles and sections of
this Contract are intended for the sole purpose of convenient reference and are
not intended, nor shall the same be

                                       16

<PAGE>

construed, to be a part of this Contract or considered in any interpretation
hereof.

         10.2     Amendment. Neither this Contract nor any provisions hereof
may ever be amended, changed, modified or supplemented except by an agreement in
writing, duly executed by the party to be charged with the same.

         10.3     Waiver. No failure by either party to enforce the performance
of any obligation of the other party under this Contract shall operate as a
waiver of such obligation or default, or as a waiver of any other right or
default, whether of a like or different character.

         10.4     Choice of Law. As to all matters of construction and
interpretation, this Contract shall be interpreted, construed and governed by
the laws of the State of Texas.

         10.5     Succession. Either party may assign its rights, titles or
interests hereunder to any individual, bank, trustee, company or corporation as
security for any note, notes, bonds or other obligations or securities of such
assignor, but not otherwise, without the written consent of the other party
hereto, which consent shall not be unreasonably withheld. No assignment provided
for hereunder shall in any way operate to enlarge, alter or change any
obligation of the other party hereto nor shall the assignee be relieved of its
obligations hereunder without the express written consent of the non-assigning
party.

         10.6     Right of Examination. Both Company and Customer shall have the
right to examine, at any reasonable time, the books, records, charts and any
operating data of the other to the extent

                                       17

<PAGE>

reasonably necessary to verify the accuracy of any statement, chart or
computation made under or pursuant to the provisions of this Contract. All
books, records and charts related to any statement, charge or computation made
hereunder shall be retained and available for review or inspection for a period
of two years.

         10.7     Entire Agreement. This Contract contains the entire agreement
and understanding of the parties hereto and there are no agreements,
understandings or representations, either oral or in writing, except as set
forth herein. That certain Precedent Agreement, between Customer and Company, is
hereby expressly superseded and terminated by the execution hereof.

         10.8     Authority. Company and Customer each hereby represents and
warrants that it has the full right, power and authority to enter into this
Contract, and that this Contract will not violate the provisions of any other
contract or agreement to which it is a party.

         10.9     Reissuance of Original Contract. This Contract ("Part A"), and
another Gas Storage Contract of even date herewith specifying a MQS of 100,000
("Part B"), are issued in replacement of that certain Firm Standby Gas Storage
Contract between Customer and Company dated February 21, 1990. The replacement
of the former contract is effected for administrative purposes only, and shall
be interpreted and construed for all purposes as merely a continuation of the
original contract.

         IN WITNESS WHEREOF, the parties have executed this Contract in one or
more copies or counterparts, each of which shall constitute

                                       18

<PAGE>

and be an original of this Contract effective between the parties effective as
of the date first-above written.

                                    COMPANY:

ATTEST:

                                    HATTIESBURG INDUSTRIAL GAS SALES
                                    COMPANY

-s- [ILLEGIBLE]                     By: -s- [ILLEGIBLE]
----------------------------            --------------------------------------
                                    Its:    President

ATTEST:

                                    CUSTOMER:

                                    MISSISSIPPI VALLEY GAS COMPANY

-s- [ILLEGIBLE]                     By: -s- WARREN K. ROGERS
----------------------------            --------------------------------------
                                    Its:    Senior Vice President

                                       19

<PAGE>

                                   EXHIBIT "A"
                         TO GAS STORAGE CONTRACT BETWEEN
                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY
                       AND MISSISSIPPI VALLEY GAS COMPANY
                           EFFECTIVE FEBRUARY 21, 1990

                          GENERAL TERMS AND CONDITIONS

         These General Terms and Conditions ("General Terms") are attached to
and incorporated into the above-referenced GAS STORAGE CONTRACT between
HATTIESBURG INDUSTRIAL GAS SALES COMPANY (herein referred to as "Company") and
MISSISSIPPI VALLEY GAS COMPANY, a Mississippi corporation (herein referred to as
"Customer").

                                   ARTICLE I

                                  DEFINITIONS

         For the purposes of this Contract, unless expressly stated otherwise,
the following definitions shall be applicable.

         1.1      The term "Btu" shall mean British Thermal Units.

         1.2      A "day" shall mean the twenty-four (24) hour period beginning
at 7:00 a.m. Jackson, Mississippi time on each calendar day and ending at 7:00
a.m. Jackson, Mississippi time on the following calendar day.

         1.3      "Contract" shall mean the above-referenced Gas Storage
Contract together with these General Terms and all other attachments hereto or
thereto.

         1.4      The term "gas" shall mean natural gas in its natural state,
produced from wells, including casinghead gas produced with crude oil, natural
gas from gas wells and residue gas resulting from processing both casinghead gas
and gas well gas.

General Terms - Page 1

<PAGE>

         1.5      The term "Mcf" shall mean one thousand (1,000) cubic feet at a
pressure of fifteen and twenty-five thousandths (15.025) psia and at a
temperature of sixty degrees (60 degrees) Fahrenheit.

         1.6      The term "MMBtu" shall mean 1,000,000 Btu.

         1.7      A "month" shall mean that period of time beginning at 7:00
a.m. Jackson, Mississippi time on the first day of a calendar month and ending
at 7:00 a.m. Jackson, Mississippi time on the first day of the following
calendar month; provided, that, the first month hereunder shall commence on the
first day of the calendar month in which the Commencement Date occurs, and the
last month hereunder shall end on the date that this Contract terminates.

         1.8      "Point(s) of Delivery" shall mean the point or points, as
identified on Exhibit "B" of the Contract, at which gas is received by Company
for injection into storage.

         1.9      "Point(s) of Redelivery" shall mean the point or points, as
identified on Exhibit "B" of the Contract, at which gas is tendered by Company
to Customer for delivery from storage.

         1.10     The term "psia" shall mean pounds per square inch absolute.

         1.11     The term "psig" shall mean pounds per square inch gauge.

         1.12     "Storage Facilities" shall be as defined in the "WHEREAS"
clauses of the Contract.

         1.13     The term "year" shall mean a period of twelve (12) consecutive
months.

General Terms - Page 2

<PAGE>

                                   ARTICLE II

                                    QUALITY

         The gas delivered by either party to the other hereunder shall meet the
quality specifications of the transporting pipeline which receives or delivers
such gas at the Point(s) of Delivery or Redelivery and shall, in addition, be of
such quality that it shall meet the following specifications, if such standards
are more stringent:

         a.       Be commercially free of dust, gum, gum-forming constituents,
                  gasoline, and other solid and/or liquid matter, including but
                  not limited to water, gas treating chemicals and well
                  completion fluids and debris, which may become separated from
                  the gas during transportation thereof.

          b.      Contain not more than one quarter (1/4) grain of hydrogen
                  sulphide per one hundred (100) cubic feet, as determined by
                  the cadmium sulfate quantitative test, nor more than nine (9)
                  grains of total sulfur per one hundred (100) cubic feet.

          c.      The gas delivered hereunder shall not contain more than
                  two-tenths of one percent (0.2%) by volume of oxygen, and
                  shall not contain more than two percent (2%) by volume of
                  carbon dioxide; and shall not contain more than two percent
                  (2%) by volume of nitrogen.

          d.      Have a heating value of not less than nine hundred eighty
                  (980) Btu's per cubic feet.

General Terms - Page 3

<PAGE>

         e.       Have a temperature of not more than one hundred twenty degrees
                  Fahrenheit (120 degrees F), nor less than forty degrees
                  Fahrenheit (40 degrees F).

         f.       Have been dehydrated by any method other than the use of a
                  calcium chloride as desiccant, for removal of entrained water
                  in excess of seven (7) pounds of water per million (1,000,000)
                  cubic feet of gas.

                                   ARTICLE III

                                    PRESSURE

         Company shall deliver gas to Customer from storage hereunder at
pressures sufficient to enter the transporting pipeline's facilities at the
Point(s) of Redelivery against the operating pressures maintained in such
pipeline from time to time, provided that Company shall not be required to
deliver gas at pressures in excess of 960 psig. Customer shall deliver gas to
Company for injection at the Point(s) of Delivery at the pressures as may be
available from time to time in the transporting pipeline's facilities at such
points, but in no event shall such pressures be less than 550 psig or greater
than Company's maximum allowable operating pressure.

                                   ARTICLE IV

                             TITLE AND RISK OF LOSS

         4.1      Title to the natural gas stored by Company and delivered to
Customer hereunder shall, at all times, be in Customer and, except as provided
in Section 4.2 Company makes no warranty of title whatsoever. Customer warrants
for itself, its successors and

General Terms - Page 4

<PAGE>

assigns, that it will have at the time of delivery of gas storage hereunder good
title or valid right to deliver such stored hereunder. Customer warrants for
itself, its successors and assigns, that the gas it delivers hereunder shall be
free and clear of all liens, encumbrances, or claims whatsoever; and that it
shall indemnify Company and save it harmless from all claims, actions, damages,
costs and expenses arising directly or indirectly from or with respect to the
title to gas tendered to Company hereunder.

         4.2      Company warrants that it shall neither cause nor allow any
cloud or encumbrance of any nature to arise by, through or under Company with
respect to Customer's title to any gas tendered to Company for storage, and
agrees to redeliver such gas pursuant to this Contract free from all liens and
adverse claims arising by, through or under Company, and that it will indemnify,
defend, protect, and save Customer harmless from all claims, suits, actions,
damages, costs and expenses arising directly or indirectly from the same.

         4.3      As between Customer and Company: Customer shall be in control
and possession of the gas prior to delivery to Company for injection at the
Point(s) of Delivery and after redelivery by Company to Customer at the Point(s)
of Redelivery, and, shall indemnify, defend and hold Company harmless from any
damage or injury caused thereby except for damages and injuries caused by the
negligence of Company; and, Company shall be in control and possession of the
gas after the receipt of the same for injection at the Point(s) of Delivery and
until redelivery by Company to

General Terms - Page 5

<PAGE>

Customer at the Point(s) of Redelivery, and, shall indemnify, defend and hold
Customer harmless from any damage or injury caused thereby, except for damages
and injuries caused by the negligence of Customer. The risk of loss for all gas
injected into, stored in and withdrawn from the Storage Facilities shall be and
remain with the party having control and possession of the gas as herein
provided.

                                    ARTICLE V

                                   MEASUREMENT

         5.1      The unit of volume for measurement of gas delivered hereunder
shall be one (1) cubic foot of gas at a base temperature of sixty degrees
Fahrenheit (60 degrees F) and at an absolute pressure of fifteen and twenty-five
thousandths (15.025) pounds per square inch. All fundamental constants,
observations, records, and procedures involved in determining and/or verifying
the quantity and other characteristics of gas delivered hereunder shall, unless
otherwise specified herein, be in accordance with the standards prescribed in
American Gas Association ("A.G.A.") Gas Measurement Committee Report No. 3, as
now and from time to time amended or supplemented. All measurements of gas shall
be determined by calculation into terms of such unit. All quantities given
herein, unless expressly stated otherwise, are in terms of such unit.
Notwithstanding the foregoing, it is agreed that, for all purposes, the Btu
content of the gas received and delivered by Company hereunder shall be measured
on an "as delivered" basis rather than a fully saturated or "wet" basis.

General Terms - Page 6

<PAGE>

         5.2      Company, at its sole expense, shall install, maintain and
operate, or cause to be installed, maintained and operated, the measurement
facilities required hereunder. Said measurement facilities shall be so equipped
with orifice meters, recording gauges, or other types of meters of standard make
and design commonly acceptable in the industry, as to accomplish the accurate
measurement of gas delivered hereunder. The changing of charts, calibrating and
adjustment of meters shall be done by Company or its agent.

         5.3      The accuracy of Company's measuring equipment shall be
verified by Company at least once in each thirty (30) day period. If either
party desires a special test of any measuring equipment, it will promptly notify
the other party and the parties shall then cooperate to secure a prompt
verification of the accuracy of such equipment. The expenses of any such special
test, if requested by Customer, shall be borne by Customer if the measuring
equipment tested is found to be accurate within the limit of plus or minus two
percent (2%) of error. For the purposes of measurement and meter calibration,
the atmospheric pressure shall be assumed to be fourteen and seventy-three
hundredths (14.73) pounds per square inch, irrespective of variations in natural
atmospheric pressure from time to time. Company and Customer, upon request,
shall have the right to be present at any test of any measuring equipment,
including any check measuring equipment installed by Customer at its sole
expense.

General Terms - Page 7

<PAGE>

         5.4      If upon testing, the metering equipment is found to be
inaccurate, in the aggregate, by two percent (2%) or more, either plus or minus,
registration thereof and any payment based upon such registration shall be
corrected at the rate of such inaccuracy for any period of inaccuracy which is
definitely known or agreed upon, or if not known or agreed upon, then for a
period extending back one-half (1/2) of the time elapsed since the day of the
last calibration, not exceeding, however, forty-five (45) days. Following any
test, any metering equipment found to be inaccurate to any degree shall be
adjusted immediately to measure accurately; however, if any inaccuracy is less
than two percent (2%), all prior readings and measurements shall be deemed to
be accurate and no adjustments to any prior reading shall be made. If, for any
reason, any meter is registering inaccurately or is out of service or out of
repair so that the quantity of gas delivered through such meter cannot be
ascertained or computed from the readings thereof, the quantity of gas so
delivered during such period shall be estimated and agreed upon by the parties
hereto upon the basis of the best available data determined,

         a.       by using the registration of any check measuring equipment, if
                  installed and registering accurately or in the absence of (a);

         b.       by correcting the error if the percentage of error is
                  ascertainable by calibration, test, or mathematical
                  calculation, or in the absence of both (a) and (b);

General Terms - Page 8

<PAGE>

         c.       by estimating the quantity of gas deliveries by deliveries
                  during preceding periods under similar conditions when the
                  meter was registering accurately.

         5.5      The measurement hereunder shall be corrected for deviation
from Boyle's Law at the pressure and temperature under which gas is delivered
hereunder.

                                   ARTICLE VI

                              BILLINGS AND PAYMENTS

         6.1      On or before the first (1st) day of each month, Company shall
render to Customer an invoice for the storage charge (D(1)) and the
deliverability charge (D(2)) due hereunder for such month. Customer shall pay
such invoiced amounts on or before the fifteenth (15th) day of the month for
which such charges are due.

         6.2      On the tenth (10th) day of each month, Company shall render to
Customer a statement for the preceding month properly identifying the applicable
Point(s) of Delivery and Point(s) of Redelivery and showing the total quantity
of gas received from and delivered to Customer hereunder, the amounts due
pursuant to Sections 6.1(c) and 6.1(d) of the Gas Storage Contract therefor, the
amount of Customer's gas in storage as of the close of such month, and
information sufficient to explain and support any adjustments made by Company
(in accordance with section 6.4 below) in determining the amount billed.
Customer shall pay Company the full amount reflected on the statements rendered
within fifteen (15) days of its receipt of same. If the fifteenth (15th) day
shall fall upon a weekend or legal holiday, then such payment shall

General Terms - Page 9

<PAGE>

be made on the first regular business day following such fifteenth (15th) day.

         6.3      In the event that Customer fails to pay any amounts when due,
interest shall accrue on all unpaid amounts from the date due until paid at a
rate of interest equal to the lesser of: (i) the rate of interest quoted as the
"prime rate" of NCNB Texas National Bank -- Dallas, Texas to its largest and
most credit-worthy commercial customers; or (ii) the highest legal rate of
interest allowed by law.

         6.4      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 discovery of the error. In the event a dispute arises as to the
amount payable in any statement rendered, Customer shall pay the amount shown
payable to Company in the statement which is not in dispute. Any overcharges
collected by Company pursuant to this section 6.4 shall be remitted to Customer,
with interest, calculated as provided in section 6.3, from the date such
overcharges are received by Company until repaid. Such payment shall not be
deemed to be a waiver of the right by Customer to recoup any overpayment. All
statements shall be considered final, and any and all objections thereto be
deemed waived, unless made in writing within twenty-four (24) months of
Customer's receipt thereof.

General Terms - Page 10
<PAGE>
                                   ARTICLE VII

                                      TAXES

         7.1      Subject to the provisions of Section 7.3, Customer agrees to
pay to Company, by way of reimbursement, within fifteen (15) days of receipt of
an invoice for same (pro-rated among all customers), all new taxes enacted and
levied or imposed upon Company after the Commencement Date and, any increases in
existing taxes which may be made effective after the Commencement Date, which
arise out of the gas storage services provided hereunder. In the event that any
additional taxes or increases in taxes are imposed with respect to the storage
of gas hereunder and, should Company elect not to challenge the same, then
Customer shall be subrogated to Company's rights to challenge same.

         7.2      The term "taxes" as used herein, shall mean all taxes which
are now in existence or which may in the future be levied upon Company, or its
facilities or the storage of gas hereunder and arising out of the gas storage
services to be provided hereunder including, but not limited to, street and
alley rental tax, licenses, fees and any other taxes, charges or fees of any
kind levied, assessed or made by any governmental authority on the act, right or
privilege of transporting, handling or delivering gas or using Company's Storage
Facilities, which is measured by the volume, heating value, value of the gas, or
any fee in respect to the gas or the storage,transportation or other handling
thereof (excluding, however, real property, ad valorem, capital stock, income or
excess profit taxes, or general franchise taxes imposed

General Terms - Page 11

<PAGE>

on corporations on account of their corporate existence or on their right to do
business within the state as a foreign corporation and similar taxes).

         7.3      Customer shall not be obligated to reimburse Company pursuant
to Section 7.1 in any year in an amount in excess of five percent (5%) of the
cumulative total of the monthly demand charges paid by Customer to Company in
such year. In the event that the total of the increases in taxes and additional
taxes exceed such five percent (5%) amount, then Company shall have the option
of paying the same or of seeking a determination from the appropriate regulatory
agency that such additional taxes or increases in taxes are prudent and
appropriate for inclusion in Company's rates. Subject to the following
provisions, in the event that such regulatory agency determines that such
additional and increased taxes including, without limitation, those in excess of
said five percent (5%) amount, are appropriate for inclusion, Customer shall
have the option of either paying such approved rate increases or terminating
this Contract, upon providing Company sixty days' prior written notice;
provided, however, that upon receipt of Customer's notice of termination,
Company shall have the option, without obligation, to charge Customer an
increased amount which does not exceed such five percent (5%) amount and, in
such event, Customer's notice of termination shall be of no force or effect and
this Contract shall continue in accordance with its terms. Company shall provide
Customer written notice of any such election within such sixty (60) day period.
Customer shall be given notice and

General Terms - Page 12

<PAGE>

shall have the right to participate in such rate determination and oppose the
appropriateness of including the additional or increased taxes in Company's
rates.

                                  ARTICLE VIII

                                REGULATORY BODIES

         This Contract is subject to all present and future valid laws and
lawful orders of all regulatory bodies now or hereafter having jurisdiction of
either or both the parties; and should either of the parties, by force of any
such law or regulation imposed at any time during the term of this Contract, be
rendered unable, wholly or in part, to carry out its obligations under this
Contract, other than Customer's obligation to make payments due hereunder then,
this Contract shall continue nevertheless and shall then be deemed modified to
conform with the requirements of such law or regulation. Notwithstanding the
above, this Contract shall not be deemed to be so modified if such law or
regulation substantially and materially prohibits Company from providing
services to Customer hereunder substantially in accordance with the terms set
forth in this Contract and, in such event, Company and Customer shall negotiate
in good faith to amend the terms of this Contract such that such law or
regulation may be complied with and both Company and Customer will continue to
receive the rights and benefits herein provided. This Contract is expressly made
subject to any and all tariff and other filings made by Company and approved by
any federal or state regulatory body provided, that Company will not, without
Customer's consent, seek to alter the

General Terms - Page 13

<PAGE>

firm character of the storage services herein provided or to reduce the term of
this Contract. In the event that any regulatory body having jurisdiction over
this Contract prohibits Company from collecting rates for the services provided
hereunder which are at least equal to the rates and charges provided for in this
Contract, then Company shall have the right to terminate this Contract. In the
event that any regulatory body having jurisdiction requires Company to collect
rates for services provided hereunder which are in excess of the rates herein
provided, then Customer shall have the right to terminate this Contract.

                                   ARTICLE IX

                                  FORCE MAJEURE

         9.1      In the event of either party hereto being rendered unable,
wholly or in part, by force majeure to carry out its obligations under this
Contract, other than to make payments hereunder (except as provided in section
9.3 below), the obligations of the party, as far as they are affected by such
force majeure, shall be suspended during the continuance of any inability so
caused, but for no longer period, and such cause shall as far as possible be
remedied with all reasonable dispatch. The party so affected by such event of
force majeure shall give written notice, including reasonably full particulars
of such force majeure, in writing or by telegraph to the other party as soon as
possible but in no event more than ten (10) days after the occurrence of the
cause so relied upon.

General Terms - Page 14

<PAGE>

         9.2      The term "force majeure" as employed herein shall mean,
without limitation, acts of God, strikes, lockouts, or other industrial
disturbances, acts of the public enemy, wars, blockades, insurrection, riots,
epidemics, landslides, lightning, earthquakes, fires, storms, floods, washouts,
arrest and restraints of governments and people, civil disturbances, explosions,
breakage and/or accidents to machinery, lines or pipe, freezing of lines of
pipe, inability to obtain or delay in obtaining rights-of-way, material,
supplies, labor or permits, or refusal by pipelines, which are transporting on
customer's behalf, to receive or deliver gas hereunder. It is understood and
agreed that the settlement of strikes or lockouts shall be entirely within the
discretion of the party having the difficulty, and that the above requirements
that any force majeure shall be remedied with all reasonable dispatch shall not
require the settlement of strikes or lockouts by acceding to the demands of any
opposing party when such course is inadvisable in the discretion of the party
having the difficulty. Company shall utilize all reasonable efforts to design,
operate and maintain its facilities in a manner which minimizes the potential
for freezing of wells or lines of pipe.

         9.3      In the event that Company is, due to an event of force
majeure, as herein defined, unable to provide storage services, in whole or in
part, under this Contract, then the obligation of Customer to make payment of
demand charges hereunder shall thereafter be waived or reduced proportionately
until service is again made available hereunder.

General Terms - Page 15

<PAGE>

                                    ARTICLE X

                             DEFAULT AND TERMINATION

         10.1     If either party hereto shall fail to perform any of the
covenants or obligations imposed upon it by virtue of this Contract (except
where such failure shall be excused under any of the provisions hereof), then in
such event the other party may, at its option, terminate this Contract by
proceeding as follows: the party not in default shall cause a written notice to
be served upon the party in default, stating specifically the cause for
terminating this Contract and declaring it to be the intention of the party
giving the notice to terminate the same; whereupon, the party in default shall
have thirty (30) days after receipt of the aforesaid notice in which to remedy
or remove the cause or causes of default stated in the notice of termination and
if, within said period of thirty (30) days, the party in default does so remedy
and remove said cause or causes, and fully indemnifies the party not in default,
then such notice shall be nullified and this Contract shall continue in full
force and effect. In the event the party in default does not so remedy and
remove the cause or causes of default, or does not fully indemnify the party
giving the notice for such party's actual damages as a result of such default
within said period of thirty (30) days, then this Contract shall become null and
void from and after the expiration of said period; provided, however, that if
such default be remedied but no indemnification therefor has been made due to a
bona fide dispute between the parties as to the amount thereof, then this
Contract

General Terms - Page 16

<PAGE>

shall not terminate, but the party not in default shall have the right to seek
recovery of its actual damages as provided by law. Any termination for breach of
this Contract shall be carried out strictly in accordance with this section.
Nothing in this Section 10.1 shall be construed to limit in any way the remedies
available to either party for breach of this Contract except for the right to
terminate.

         10.2     Any cancellation of this Contract pursuant to the provisions
of this Article X shall be without prejudice to the right of the party not in
default to collect any amounts then due it and without waiver of any other
remedy to which the party not in default may be entitled.

         10.3     In the event of termination, cancellation or expiration of
this Contract and, upon such occurrence, there is gas in storage for Customer's
account, this Contract shall continue in force and effect for the sole purpose
of withdrawal and delivery of and payment for storage services of said gas for
an additional ninety (90) days.

General Terms - Page 17

<PAGE>

                                   EXHIBIT "B"
                         TO GAS STORAGE CONTRACT BETWEEN
                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY
                       AND MISSISSIPPI VALLEY GAS COMPANY
                           EFFECTIVE FEBRUARY 21, 1990

<TABLE>
<CAPTION>
                                                                                    Maximum Quantity
                        POINT(S) OF DELIVERY                                          (In MMBtu's)
                        --------------------                                        ----------------
<S>                                                                                 <C>
Interconnection between the Storage                                                      10,000
Facilities and the pipeline facilities of Transco in Covington County,
Mississippi

Interconnection between the Storage                                                      10,000
Facilities and the pipeline facilities of Tennessee in Forrest County,
Mississippi
</TABLE>

Gas may be scheduled for delivery at either or both of the Points of Delivery,
in quantities up to the maximum quantities indicated for each such point, but
the cumulative total of deliveries at both Points of Delivery shall not exceed
the MDIQ stated in the Contract, unless otherwise agreed by Company.

<TABLE>
<CAPTION>
                                                                                    Maximum Quantity
                    POINT (S) Of REDELIVERY                                           (In MMBtu's)
                    -----------------------                                         ----------------
<S>                                                                                 <C>
Interconnection between the Storage                                                      20,000
Facilities and the pipeline facilities of Transco in Covington County,
Mississippi

Interconnection between the Storage                                                      20,000
Facilities and the pipeline facilities of Tennessee in Forrest County,
Mississippi
</TABLE>

Gas may be scheduled for delivery at either or both of the Points of Redelivery,
in quantities up to the maximum quantities indicated for each such point, but
the cumulative total of deliveries at both Points of Redelivery shall not exceed
the MDWQ stated in the Contract, unless otherwise agreed by Company.

<PAGE>

                                                                 HATTIESBURG - B

                         100,000 SUBSCRIBED IN PHASE 1

                                  FIRM STANDBY

                              GAS STORAGE CONTRACT

                                 BY AND BETWEEN

                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY

                                      AND

                         MISSISSIPPI VALLEY GAS COMPANY

                                    EFFECTIVE

                                FEBRUARY 21, 1990

                                     PART B*

*        This Contract for 100,000 MQS ("Part B") is issued, together with a
         second contract for 200,000 MQS ("Part A"), in replacement of the
         original Firm Standby Gas Storage Contract for 300,000 MQS dated
         February 21, 1990.

<PAGE>

                                TABLE OF CONTENTS

                        FIRM STANDBY GAS STORAGE CONTRACT

<TABLE>
<S>                                                                               <C>
I.       ACQUISITION AND CONSTRUCTION...........................................   2
II.      GAS TO BE STORED AND DELIVERED.........................................   4
III.     SCHEDULING.............................................................   6
IV.      POINT(S) OF DELIVERY AND REDELIVERY....................................   8
V.       TERM ..................................................................   8
VI.      RATES .................................................................   9
VII.     NOTICES................................................................  13
VIII.    GENERAL TERMS AND CONDITIONS...........................................  15
IX.      ADDITIONAL STORAGE OPTION..............................................  15
X.       MISCELLANEOUS..........................................................  16

                                   Exhibit "A"
                          General Terms and Conditions

I.       DEFINITIONS............................................................   1
II.      QUALITY................................................................   3
III.     PRESSURE...............................................................   4
IV.      TITLE AND RISK OF LOSS.................................................   4
V.       MEASUREMENT............................................................   6
VI.      BILLINGS AND PAYMENTS .................................................   9
VII.     TAXES..................................................................  10
VIII.    REGULATORY BODIES......................................................  13
IX.      FORCE MAJEURE..........................................................  14
X.       DEFAULT AND TERMINATION................................................  16

                                   Exhibit "B"
                       Point(s) of Delivery and Redelivery
</TABLE>

<PAGE>

                              GAS STORAGE CONTRACT

         THIS GAS STORAGE CONTRACT (hereinafter referred to as the "Contract")
is made effective as of the 21st day of February, 1990, by and between
HATTIESBURG INDUSTRIAL GAS SALES COMPANY, a Delaware corporation, (f/k/a Endevco
Industrial Gas Sales Company) (herein referred to as "Company"), operator of the
Storage Facilities (as defined below) and managing general partner of the
Hattiesburg Gas Storage Company, the owner of the said Storage Facilities, and
MISSISSIPPI VALLEY GAS COMPANY, a Mississippi corporation (herein referred to as
"Customer").

                              W I T N E S S E T H:

         WHEREAS, Company and Customer are parties to a "Precedent Agreement"
dated October 13, 1989, wherein Company and Customer agreed, upon the
satisfaction of certain conditions, to enter into this Contract; and

         WHEREAS, the conditions in the Precedent Agreement have been satisfied
or waived; and

         WHEREAS, subject to the terms hereof, Company will acquire certain
caverns located near Petal, Mississippi and develop such caverns into
underground natural gas storage facilities (hereinafter referred to as the
"Storage Facilities") initially having a usable storage capacity of
approximately two billion cubic feet ("Phase I"), and which may, at Company's
discretion, subsequently be expanded to a capacity of approximately five billion
cubic feet of usable storage capacity ("Phase II"); and

<PAGE>

         WHEREAS, Company will install and construct all facilities necessary to
connect the Storage Facilities with the Point(s) of Delivery and Point(s) of
Redelivery herein specified; and

         WHEREAS, Customer desires that Company receive, on a firm basis, at the
Points of Delivery herein specified, certain quantities of gas from the pipeline
facilities of Transcontinental Gas Pipe Line Corporation ("Transco") and/or
Tennessee Gas Pipeline Company ("Tennessee") for the purpose of injecting and
storing such gas for Customer or for its account in such Storage Facilities, and
that Company redeliver such gas, on a firm basis, into the facilities of said
pipeline companies, at the Points of Redelivery herein specified; and

         WHEREAS, Company desires to perform such services for Customer, all to
be provided pursuant and subject to the terms and conditions hereof;

         NOW, THEREFORE, for and in consideration of the mutual covenants herein
contained, together with other good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged and confessed by both parties
hereto, Company and Customer hereby agree as follows:

                                    ARTICLE I

                          ACQUISITION AND CONSTRUCTION

         Within thirty (30) days after the execution hereof, Company shall
endeavor to close its purchase of the Storage Facilities, on terms and
conditions satisfactory to Company. Thereafter, Company shall commence the
construction and development of the Storage Facilities and shall provide
Customer written notice of the

                                       2

<PAGE>

commencement of construction and the date upon which Company anticipates that
such facilities will be operational. Upon completion of construction, including
testing, as required by all applicable federal, state and/or applicable codes,
and all other matters required for operation, Company shall provide Customer
written notice that said facilities are fully operational and shall state in
such notice a date upon which Company will be ready to receive gas for storage,
which date shall be not less than thirty (30) days following such notice (such
date to be hereinafter referred to as the "Commencement Date"). If the
Commencement Date does not occur on or before December 1, 1990, or such later
date as may be agreed upon, (subject to a day for day extension for delays
caused by an event(s) of "force majeure" as herein defined and for each day
after March 8, 1990 which expires prior to the date that Company receives
executed Firm Storage Contracts covering at least 165,000 MMBtu of MDWQ, as
herein defined), for any reason, including, without limitation, Company's
inability to close its purchase of the Storage Facilities on terms acceptable to
Company, then either party shall have the right to terminate this Contract,
without further liability or obligation to the other party hereunder, by
providing the other party thirty (30) days prior written notice. Notwithstanding
the foregoing, in the event that Customer gives notice of termination in
accordance with the above and, thereafter, Company provides written notice to
Customer stating a Commencement Date which will occur prior to the expiration of
such thirty (30) day period, then, Customer's notice of termination shall be
void and of no further force or effect and

                                       3

<PAGE>

this Contract shall continue in accordance with its terms, unless Company is
unable to commence service on the Commencement Date stated in its notice.

                                   ARTICLE II

                         GAS TO BE STORED AND DELIVERED

         2.1      Subject to the terms and provisions of this Contract, Company
agrees to reserve for service to Customer a portion of the Storage Facilities.
The capacities so reserved for Customer shall be sufficient to enable Customer
to inject gas into, withdraw gas from, and store gas in the Storage Facilities,
in quantities up to the maximum quantities set forth below:

         (i)      a maximum daily withdrawal quantity ("MDWQ") of 10,000 MMBtu
                  per day;

         (ii)     a maximum daily injection quantity ("MDIQ") of 5,000 MMBtu per
                  day;

         (iii)    a maximum capacity in the Storage Facilities ("MQS") equal to
                  100,000 MMBtu.

         2.2      Customer shall tender or cause to be tendered to Company at
the Point(s) of Delivery any gas which Customer desires to have injected into
storage hereunder. Customer shall also receive or cause to be received gas
requested to be withdrawn from storage at the Point(s) of Redelivery upon tender
for redelivery by Company.

         2.3      Subject to the operating conditions of the pipelines
delivering or receiving gas for Customer's account, Company shall receive gas
for injection from Customer at the Point(s) of Delivery and redeliver gas to
Customer at the Point(s) of Redelivery as scheduled by Customer from time to
time; provided that Company

                                       4

<PAGE>

shall not be obligated to receive for injection any quantity of gas if the
injection of the same would cause the quantity of gas stored in the Storage
Facilities for Customer's account ("Customer's Gas Storage Inventory") to exceed
Customer's MQS as stated above; nor shall Company be obligated at any time to
deliver more gas to Customer than Customer has in its then-current Customer's
Gas Storage Inventory.

         2.4      Company shall not be obligated to receive, at any Point of
Delivery for injection, or to redeliver, at any Point of Redelivery, any
quantity of gas when the quantity of gas tendered for delivery to Company or
requested by Customer to be redelivered, together with all other volumes of gas
tendered for delivery to Company at any such Point of Delivery, or requested for
redelivery at such Point of Redelivery, is less than 5,000 MMBtu per day in the
aggregate.

         2.5      In addition to the maximum daily rates of injection and
withdrawal as specified above in Section 2.1, Company shall use its best efforts
to accommodate requests of Customer to inject or withdraw gas at greater rates
of flow and, at such Point(s) of Delivery or Point(s) or Redelivery in addition
to those specified on Exhibit "B" annexed hereto, at such times as such
additional capacities are not required for service to other firm, standby
storage customers. Any such additional services shall be provided at the rates
stated in Section 6.1(c) and 6.1(d), as may be amended by Section 6.1(e), only
as capacities are available and on a pro-rata basis to other firm, standby
storage customers, without obligation or liability for interruption by Company
as to any

                                       5

<PAGE>

withdrawals or injections in excess of the maximums reserved for Customer.
Additional withdrawals and/or injections will be made only to the extent that
Customer has gas in storage to be withdrawn, or unfilled capacity in the Storage
Facilities reserved as part of Customer's MQS as stated herein.

                                   ARTICLE III

                                   SCHEDULING

         3.1      At any time during any day when Customer desires Company to
receive and inject gas into, or to withdraw and deliver gas from, the Storage
Facilities, Customer shall give verbal notice in accordance with Section 3.2 of
this Article to Company's dispatcher, specifying the quantity of gas to be
injected or withdrawn and the appropriate Points of Delivery or Points of
Redelivery, as applicable. Customer shall make available and tender any gas to
be injected hereunder and receive and accept delivery, upon tender by Company,
any gas requested to be withdrawn from storage. The quantity of gas stored in
the Storage Facilities for the account of Customer shall be increased or
decreased upon injection or withdrawal of gas from storage, as applicable.
Customer shall not (unless otherwise agreed by Company), on an hourly basis,
tender for injection nor shall Company be obligated to receive gas for injection
or to withdraw and deliver gas from storage, at rates of flow in excess of 1/24
of Customer's MDIQ or MDWQ, respectively.

         3.2      Customer shall notify Company at least eight (8) hours in
advance of any requested change in the daily or hourly rate of flow for
injections or withdrawals of gas hereunder. Company may waive

                                       6

<PAGE>

any part of the eight (8) hour notice upon request if, in Company's reasonable
judgement, operating conditions permit such waiver. Customer shall notify
Company immediately of any circumstance which causes or will cause the
deliveries to or receipts from Company to be different from those requested.
Notices provided in this Article may be verbal, followed by a written
confirmation delivered via telecopy, overnight mail, first class U.S. mail, or
hand-delivery when such written confirmation is requested by either party.
Customer shall provide notice of any changes in deliveries to or receipts from
Company to all applicable transporting pipelines and shall be responsible for,
and shall indemnify and hold Company harmless from, any and all liabilities and
expenses resulting from Customer's failure to notify all applicable transporting
pipelines of any such changes.

         3.3      In the event that an imbalance occurs on the pipeline to or
from which such gas is delivered or received, which imbalance results from
Company's failure to tender the quantities of gas scheduled for delivery from
storage, or accept delivery of the quantities of gas scheduled for injection
into storage and tendered for delivery by Customer, all in accordance with and
subject to this Contract, Company shall reimburse Customer for any imbalance
penalty due and rightfully owing to the pipeline receiving or delivering the gas
at such Point(s) of Delivery or Point(s) of Redelivery, which was caused by
Company's failure to accept or deliver gas. In the event that Company is unable
to receive or deliver gas as required by this Contract and in accordance with
the request of Customer as provided above, Company shall notify

                                       7

<PAGE>

Customer as soon as practicable following any failure to receive or tender such
gas and, Customer shall, as soon as practicable following receipt of such
notice, notify and change nominations and scheduling with all pipelines and
other parties delivering or receiving gas to be delivered to or withdrawn from
storage for Customer and be reasonably diligent in taking such further actions
to prevent or minimize any imbalances from occurring. Customer and Company will
diligently work to correct any imbalance so caused prior to the end of the
applicable balancing period.

                                   ARTICLE IV

                       POINT(S) OF DELIVERY AND REDELIVERY

         4.1      The Point(s) of Delivery for all gas to be tendered by
Customer to Company for injection into the Storage Facilities shall be as
specified on Exhibit "B" attached hereto, and the maximum daily quantity of gas
which Company is obligated to receive from Customer at each individual Point of
Delivery shall not exceed the maximum stated thereon.

         4.2      The Point(s) of Redelivery for all gas to be tendered by
Company to Customer for redelivery pursuant to the terms hereof shall be as
specified on Exhibit "B", attached hereto, and the maximum quantities of gas
which Company is obligated to redeliver to Customer at each such Point of
Redelivery shall not exceed the maximum stated thereon.

                                    ARTICLE V

                                      TERM

         5.1      This Contract shall be effective as of the date set forth at
the outset hereof and shall continue in full force and effect

                                       8

<PAGE>

for a primary term of fifteen (15) years following the Commencement Date, as
defined in Article I hereof, and year to year thereafter unless and until
terminated effective at the end of such fifteenth (15th) year or any year
thereafter by either party upon not less than thirty-six (36) months prior
written notice.

         5.2      Upon expiration hereof, Company agrees that in the event that
gas storage services are still being provided in the Storage Facilities by
Company, or any assignee of Company as provided for herein, to other customers,
then, Customer shall have the right and option to continue to receive storage
services from Company, or such assignee of Company, pursuant to terms and
conditions, and for rates and charges substantially similar to those being
offered to said other customers by Company, or such assignee of Company, at the
time of such expiration.

                                   ARTICLE VI

                                      RATES

         6.1      During the first ten (10) years following the Commencement
Date, Customer shall pay to Company each month the following charges:

                  6.1(a)   A storage charge ("D (1)") of twenty and one-half
         cents ($0.205) multiplied by Customer's MQS amount specified in this
         Agreement; plus

                  6.1(b)   A deliverability charge ("D (2)") of fifty-eight
         cents ($0.58) multiplied by Customer's MDWQ amount; plus

                  6.1(c)   One cent ($0.01) for each MMBtu of gas received by
         Company for injection into storage hereunder and one cent

                                       9

<PAGE>

         ($0.01) for each MMBtu of gas redelivered by Company to Customer
         hereunder; plus

                  6.1(d)   Customer's pro-rata share of the cost of gas consumed
         in the operation of the Storage Facilities, such to be pro rated among
         all Customers based upon the quantities of gas injected and withdrawn
         by each Customer during each month. It is presently estimated that the
         total cost of gas to be consumed in the injection and withdrawal of gas
         into and from the Storage Facilities will initially total approximately
         three cents ($0.03) per MMBtu, in the aggregate; however, the parties
         agree that this cost may change from time to time and Customer shall
         continue to bear its pro rata share of such cost. Company shall
         endeavor to operate the Storage Facilities in an efficient manner so as
         to limit the gas consumed to that quantity reasonably required. Each
         month, Company shall provide Customer a statement showing its prorata
         share of such quantity and the cost of the gas consumed in the
         operation of Storage Facilities, along with the necessary supporting
         workpapers showing the total quantity and cost of gas so consumed and
         the proration calculations. Customer shall have the option, exercisable
         upon thirty (30) days prior written notice at any time during the term
         hereof, to thereafter (during the term hereof) supply its pro-rata
         share of gas consumed, as opposed to reimbursing Company in accordance
         herewith. In the event that Customer elects to provide its pro-rata
         share of the fuel used hereunder, then, following such election,
         Company shall establish and maintain

                                       10
<PAGE>

an account (the "Fuel Account") with Customer. Initially, one and one-half
percent (1 1/2%) of all gas delivered to Company at the Points of Delivery
hereunder shall be retained by Company and credited to the Fuel Account.
Customer shall not pay any injection, withdrawal or storage fee as to any
volumes retained by Company. At the close of each month, Company shall debit the
Fuel Account with Customer's pro-rata share of the fuel gas. From time to time
during the term hereof, Company shall have the right, upon providing Customer
ten (10) days' prior written notice, to adjust the quantity of gas to be
retained by Company and credited to the Fuel Account in order to reflect actual
quantities of gas consumed in the operation of the Storage Facilities and, to
cause the Fuel Account to be as near to zero as is practicable on a monthly
basis. Within thirty (30) days following the termination hereof, Company shall
deliver gas to Customer, or Customer shall deliver gas to Company, as is
necessary to cause the Fuel Account to equal zero. Company shall report the
status of the Fuel Account as of the end of the previous month with each monthly
statement. Customer shall have the right to deliver to Company the maximum
capacities set forth in Section 2.1(iii) in addition to the gas delivered by
Customer for credit to the Fuel Account.

         6.1(e)   The fees payable for each MMBtu of gas delivered to Company
for injection and for each MMBtu of gas redelivered to Customer hereunder, as
provided for in section 6.1(c), shall be subject to adjustment, upon

                                       11

<PAGE>

         application to and approval by the appropriate regulatory commission,
         to reflect increases or decreases in the cost of maintenance, supplies
         and other variable expenses incurred by Company in performing the
         services hereunder. Customer shall have the right to contest any
         increase sought hereunder before the appropriate regulatory commission.
         No such adjusted fee shall exceed, however: (i) the fee herein
         provided; multiplied by (ii) the sum of one (1) plus the percentage
         change in the Gross National Product Implicit Price Deflator (the
         "Index") for the December of the then-current calendar year as compared
         to such Index for December, 1990.

         6.2      Notwithstanding the above, in the event that Company elects to
expand the Storage Facilities as referenced in section 9.1, the rates and
charges payable hereunder during the remaining portion of the initial ten (10)
years hereof shall be redetermined such that the sum of: (a) the D(1) storage
charge, as provided in section 6.1(a); and (b) the D(2) deliverability charge,
as provided in section 6.1(b); will be reduced such that the total reservation
charges payable hereunder during each month shall not exceed eighty percent
(80%) of the total reservation charges payable hereunder prior to such expansion
and rate redetermination.

         6.3      The charges payable hereunder for the remainder of the term
hereof following the tenth (10th) year (after the Commencement Date) may be
redetermined by the appropriate regulatory body in accordance with this section
6.3. Company shall have the right, upon its election, or shall be obligated,
upon request of Customer, to submit cost-of-service information to the
appropriate regulatory

                                       12

<PAGE>

authority for a review of the rates charged hereunder and to request a
determination by such regulatory authority of a rate for the remaining term
hereof. Customer shall have the right to take part in such proceedings and to
contest the proposed rates to the full extent allowed. Company shall provide
Customer not less than thirty (30) days prior written notice of Company's intent
to file for a new rate as herein provided. In the event that the rates resulting
from such redetermination are in excess of one hundred and ten percent (110%) of
the rates specified in Section 6.1, then Customer shall have the right to
terminate this Contract upon sixty (60) days' prior written notice; provided,
however, that during such sixty (60) day period following the receipt of
Customer's notice, Company shall have the option, without obligation, to agree
to charge Customer rates which do not exceed one hundred and ten percent (110%)
of the rates set forth in Section 6.1 and, in such event, this Contract shall
continue for the remaining term. Company shall provide Customer written notice
of any such election before the expiration of said sixty (60) day period and,
shall therein specify the rate to be charged hereunder.

                                   ARTICLE VII

                                     NOTICES

         7.1      Whenever any notice, request, demand, statement or payment is
required or permitted to be given under any provision of this Contract, unless
expressly provided otherwise, such shall be in writing, signed by or on behalf
of the person giving the same, and shall be deemed to have been given and
received upon the

                                       13

<PAGE>

actual receipt (including the receipt of a telecopy or facsimile of such notice)
at the address of the parties as follows:

         Company:

         For Notices:       Hattiesburg Industrial Gas Sales Company
                            5950 Berkshire Lane
                            Suite 1400, L.B. 17
                            Dallas, Texas 75225

         Payments
         (Wire Transfer) :  Union Bank of California -- Los Angeles
                            ABA # 122000496
                            For Account of Hattiesburg Gas Storage Company
                            Acct No. 0880411845

         Customer:          Mississippi Valley Gas Company
                            711 W. Capital Street
                            Jackson, Mississippi 39203

         7.2      Operating communications made by telephone or other mutually
agreeable means shall be confirmed in writing or by telecopy within two (2) days
following same if requested by either party. To facilitate such operating
communications on a daily basis, lists of names, telephone and telecopy numbers
of appropriate operating personnel shall be exchanged by and between Company and
Customer before commencement of service under this Contract. Such lists shall be
updated from time to time if changed.

         7.3      The addresses of the parties may be revised upon written
notice given in accordance herewith, designating in such writing the new address
of the party so affected.

                                       14

<PAGE>

                                  ARTICLE VIII

                          GENERAL TERMS AND CONDITIONS

         The General Terms and Conditions attached hereto as Exhibit "A" are
hereby incorporated herein and made a part of this Contract as if fully set
forth herein. Any conflict or inconsistency, either in construction or
interpretation, between the terms hereof and the General Terms and Conditions
attached hereto shall be resolved in favor of the terms hereof,

                                   ARTICLE IX

                           ADDITIONAL STORAGE OPTION

         9.1      Company anticipates that it may elect to expand the Storage
Facilities at some time following initial storage operations. In the event that
Company so elects to expand the Storage Facilities, Company hereby grants
Customer an option on a pro rata portion of any increased capacities (for
storage, withdrawal or injection) developed by Company in the Storage
Facilities. Such proportionate share shall equal (i) the total additional
capacity (for storage, withdrawal or injection) developed by Company in such
Storage Facilities multiplied by (ii) a fraction, the numerator of which shall
equal Customer's rights to such capacity hereunder (MQS, MDWQ or MDIQ) and the
denominator of which shall equal the total storage capacity (for storage,
withdrawal or injection) of the Storage Facilities immediately preceding such
increase in capacity. Customer shall exercise its option, if at all, in
accordance with section 9.2 below.

                                       15

<PAGE>

         9.2      In the event that Company makes the determination to increase
any capacity (for storage, withdrawal or injection) at the Storage Facilities,
Company shall so notify Customer in writing. Such notice shall contain the terms
and conditions upon which Company will contract with other parties for such
capacity(ies), which terms shall be similar to those provided in this Contract.
For ninety (90) days following receipt of such notice, Customer shall have the
right, without obligation, to contract for additional storage rights in the
Storage Facilities upon the terms and conditions offered by Company and
reflected in the notice or such other terms as may be agreed to by Customer and
Company. Should Customer elect to contract for such additional rights, and
provide Company with written notice of such election within such ninety (90) day
period, Company shall provide Customer with formal contracts for execution. The
failure of Customer to provide written notice to Company of its election to
contract for such additional capacity rights within such ninety (90) day period,
or the failure of Customer, following such election, to execute and return to
Company the contract provided to Customer within thirty (30) days following
Customer's receipt of same, shall be deemed a waiver of Customer's option on
such capacity(ies).

                                   ARTICLE X

                                 MISCELLANEOUS

         10.1     Headings. The subject headings of the articles and sections of
this Contract are intended for the sole purpose of convenient reference and are
not intended, nor shall the same be

                                       16

<PAGE>

construed, to be a part of this Contract or considered in any interpretation
hereof.

         10.2     Amendment. Neither this Contract nor any provisions hereof may
ever be amended, changed, modified or supplemented except by an agreement in
writing, duly executed by the party to be charged with the same.

         10.3     Waiver. No failure by either party to enforce the performance
of any obligation of the other party under this Contract shall operate as a
waiver of such obligation or default, or as a waiver of any other right or
default, whether of a like or different character.

         10.4     Choice of Law. As to all matters of construction and
interpretation, this Contract shall be interpreted, construed and governed by
the laws of the State of Texas.

         10.5     Succession. Either party may assign its rights, titles or
interests hereunder to any individual, bank, trustee, company or corporation as
security for any note, notes, bonds or other obligations or securities of such
assignor, but not otherwise, without the written consent of the other party
hereto, which consent shall not be unreasonably withheld. No assignment provided
for hereunder shall in any way operate to enlarge, alter or change any
obligation of the other party hereto nor shall the assignee be relieved of its
obligations hereunder without the express written consent of the non-assigning
party.

         10.6     Right of Examination. Both Company and Customer shall have the
right to examine, at any reasonable time, the books, records, charts and any
operating data of the other to the extent

                                       17

<PAGE>

reasonably necessary to verify the accuracy of any statement, chart or
computation made under or pursuant to the provisions of this Contract. All
books, records and charts related to any statement, charge or computation made
hereunder shall be retained and available for review or inspection for a period
of two years.

         10.7     Entire Agreement. This Contract contains the entire agreement
and understanding of the parties hereto and there are no agreements,
understandings or representations, either oral or in writing, except as set
forth herein. That certain Precedent Agreement, between Customer and Company, is
hereby expressly superseded and terminated by the execution hereof.

         10.8     Authority. Company and Customer each hereby represents and
warrants that it has the full right, power and authority to enter into this
Contract, and that this Contract will not violate the provisions of any other
contract or agreement to which it is a party.

         10.9     Reissuance of Original Contract. This Contract ("Part B"), and
another Gas Storage Contract of even date herewith specifying a MQS of 200,000
("Part A"), are issued in replacement of that certain Firm Standby Gas Storage
Contract between Customer and Company dated February 21, 1990. The replacement
of the former contract is effected for administrative purposes only, and shall
be interpreted and construed for all purposes as merely a continuation of the
original contract.

         IN WITNESS WHEREOF, the parties have executed this Contract in one or
more copies or counterparts, each of which shall constitute

                                       18

<PAGE>

and be an original of this Contract effective between the parties effective as
of the date first-above written.

                                        COMPANY:

ATTEST:                                 HATTIESBURG INDUSTRIAL GAS SALES COMPANY

[ILLEGIBLE]                             By: [ILLEGIBLE]
---------------------------------           ------------------------------------
                                        Its: President

                                        CUSTOMER:

ATTEST:                                 MISSISSIPPI VALLEY GAS COMPANY

[ILLEGIBLE]                             By: -s- Warren K. Rogers
---------------------------------           ------------------------------------
                                        Its: Senior Vice President

                                       19

<PAGE>

                                   EXHIBIT "A"

                         TO GAS STORAGE CONTRACT BETWEEN
                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY
                       AND MISSISSIPPI VALLEY GAS COMPANY
                          EFFECTIVE FEBRUARY 21, 1990

                          GENERAL TERMS AND CONDITIONS

         These General Terms and Conditions ("General Terms") are attached to
and incorporated into the above-referenced GAS STORAGE CONTRACT between
HATTIESBURG INDUSTRIAL GAS SALES COMPANY (herein referred to as "Company") and
MISSISSIPPI VALLEY GAS COMPANY, a Mississippi corporation (herein referred to as
"Customer").

                                    ARTICLE I

                                   DEFINITIONS

         For the purposes of this Contract, unless expressly stated otherwise,
the following definitions shall be applicable.

         1.1      The term "Btu" shall mean British Thermal Units.

         1.2      A "day" shall mean the twenty-four (24) hour period beginning
at 7:00 a.m. Jackson, Mississippi time on each calendar day and ending at 7:00
a.m. Jackson, Mississippi time on the following calendar day.

         1.3      "Contract" shall mean the above-referenced Gas Storage
Contract together with these General Terms and all other attachments hereto or
thereto.

         1.4      The term "gas" shall mean natural gas in its natural state,
produced from wells, including casinghead gas produced with crude oil, natural
gas from gas wells and residue gas resulting from processing both casinghead gas
and gas well gas.

General Terms - Page 1

<PAGE>

         1.5      The term "Mcf" shall mean one thousand (1,000) cubic feet at a
pressure of fifteen and twenty-five thousandths (15.025) psia and at a
temperature of sixty degrees (60 degrees) Fahrenheit.

         1.6      The term "MMBtu" shall mean 1,000,000 Btu.

         1.7      A "month" shall mean that period of time beginning at 7:00
a.m. Jackson, Mississippi time on the first day of a calendar month and ending
at 7:00 a.m. Jackson, Mississippi time on the first day of the following
calendar month; provided, that, the first month hereunder shall commence on the
first day of the calendar month in which the Commencement Date occurs, and the
last month hereunder shall end on the date that this Contract terminates.

         1.8      "Point(s) of Delivery" shall mean the point or points, as
identified on Exhibit "B" of the Contract, at which gas is received by Company
for injection into storage.

         1.9      "Point(s) of Redelivery" shall mean the point or points, as
identified on Exhibit "B" of the Contract, at which gas is tendered by Company
to Customer for delivery from storage.

         1.10     The term "psia" shall mean pounds per square inch absolute.

         1.11     The term "psig" shall mean pounds per square inch gauge.

         1.12     "Storage Facilities" shall be as defined in the "WHEREAS"
clauses of the Contract.

         1.13     The term "year" shall mean a period of twelve (12) consecutive
months.

General Terms - Page 2

<PAGE>

                                   ARTICLE II

                                     QUALITY

         The gas delivered by either party to the other hereunder shall meet the
quality specifications of the transporting pipeline which receives or delivers
such gas at the Point(s) of Delivery or Redelivery and shall, in addition, be
of such quality that it shall meet the following specifications, if such
standards are more stringent:

         a.       Be commercially free of dust, gum, gum-forming constituents,
                  gasoline, and other solid and/or liquid matter, including but
                  not limited to water, gas treating chemicals and well
                  completion fluids and debris, which may become separated from
                  the gas during transportation thereof.

         b.       Contain not more than one quarter (1/4) grain of hydrogen
                  sulphide per one hundred (100) cubic feet, as determined by
                  the cadmium sulfate quantitative test, nor more than nine (9)
                  grains of total sulfur per one hundred (100) cubic feet.

         c.       The gas delivered hereunder shall not contain more than
                  two-tenths of one percent (0.2%) by volume of oxygen, and
                  shall not contain more than two percent (2%) by volume of
                  carbon dioxide; and shall not contain more than two percent
                  (2%) by volume of nitrogen.

         d.       Have a heating value of not less than nine hundred eighty
                  (980) Btu's per cubic feet.

General Terms - Page 3

<PAGE>

         e.       Have a temperature of not more than one hundred twenty degrees
                  Fahrenheit (120 degrees F), nor less than forty degrees
                  Fahrenheit (40 degrees F).

         f.       Have been dehydrated by any method other than the use of a
                  calcium chloride as desiccant, for removal of entrained water
                  in excess of seven (7) pounds of water per million (1,000,000)
                  cubic feet of gas.

                                   ARTICLE III

                                    PRESSURE

         Company shall deliver gas to Customer from storage hereunder at
pressures sufficient to enter the transporting pipeline's facilities at the
Point(s) of Redelivery against the operating pressures maintained in such
pipeline from time to time, provided that Company shall not be required to
deliver gas at pressures in excess of 960 psig. Customer shall deliver gas to
Company for injection at the Point(s) of Delivery at the pressures as may be
available from time to time in the transporting pipeline's facilities at such
points, but in no event shall such pressures be less than 550 psig or greater
than Company's maximum allowable operating pressure.

                                   ARTICLE IV

                             TITLE AND RISK OF LOSS

         4.1      Title to the natural gas stored by Company and delivered to
Customer hereunder shall, at all times, be in Customer and, except as provided
in Section 4.2 Company makes no warranty of title whatsoever. Customer warrants
for itself, its successors and

General Terms - Page 4

<PAGE>

assigns, that it will have at the time of delivery of gas storage hereunder good
title or valid right to deliver such stored hereunder. Customer warrants for
itself, its successors and assigns, that the gas it delivers hereunder shall be
free and clear of all liens, encumbrances, or claims whatsoever; and that it
shall indemnify Company and save it harmless from all claims, actions, damages,
costs and expenses arising directly or indirectly from or with respect to the
title to gas tendered to Company hereunder.

         4.2      Company warrants that it shall neither cause nor allow any
cloud or encumbrance of any nature to arise by, through or under Company with
respect to Customer's title to any gas tendered to Company for storage, and
agrees to redeliver such gas pursuant to this Contract free from all liens and
adverse claims arising by, through or under Company, and that it will indemnify,
defend, protect, and save Customer harmless from all claims, suits, actions,
damages, costs and expenses arising directly or indirectly from the same.

         4.3      As between Customer and Company: Customer shall be in control
and possession of the gas prior to delivery to Company for injection at the
Point(s) of Delivery and after redelivery by Company to Customer at the Point(s)
of Redelivery, and, shall indemnify, defend and hold Company harmless from any
damage or injury caused thereby except for damages and injuries caused by the
negligence of Company; and, Company shall be in control and possession of the
gas after the receipt of the same for injection at the Point(s) of Delivery and
until redelivery by Company to

General Terms - Page 5

<PAGE>

Customer at the Point(s) of Redelivery, and, shall indemnify, defend and hold
Customer harmless from any damage or injury caused thereby, except for damages
and injuries caused by the negligence of Customer. The risk of loss for all gas
injected into, stored in and withdrawn from the Storage Facilities shall be and
remain with the party having control and possession of the gas as herein
provided.

                                    ARTICLE V

                                   MEASUREMENT

         5.1      The unit of volume for measurement of gas delivered hereunder
shall be one (1) cubic foot of gas at a base temperature of sixty degrees
Fahrenheit (60 degrees F) and at an absolute pressure of fifteen and twenty-five
thousandths (15.025) pounds per square inch. All fundamental constants,
observations, records, and procedures involved in determining and/or verifying
the quantity and other characteristics of gas delivered hereunder shall, unless
otherwise specified herein, be in accordance with the standards prescribed in
American Gas Association ("A.G.A.") Gas Measurement Committee Report No. 3, as
now and from time to time amended or supplemented. All measurements of gas shall
be determined by calculation into terms of such unit. All quantities given
herein, unless expressly stated otherwise, are in terms of such unit.
Notwithstanding the foregoing, it is agreed that, for all purposes, the Btu
content of the gas received and delivered by Company hereunder shall be measured
on an "as delivered" basis rather than a fully saturated or "wet" basis.

General Terms - Page 6

<PAGE>

         5.2      Company, at its sole expense, shall install, maintain and
operate, or cause to be installed, maintained and operated, the measurement
facilities required hereunder. Said measurement facilities shall be so equipped
with orifice meters, recording gauges, or other types of meters of standard make
and design commonly acceptable in the industry, as to accomplish the accurate
measurement of gas delivered hereunder. The changing of charts, calibrating and
adjustment of meters shall be done by Company or its agent.

         5.3      The accuracy of Company's measuring equipment shall be
verified by Company at least once in each thirty (30) day period. If either
party desires a special test of any measuring equipment, it will promptly notify
the other party and the parties shall then cooperate to secure a prompt
verification of the accuracy of such equipment. The expenses of any such special
test, if requested by Customer, shall be borne by Customer if the measuring
equipment tested is found to be accurate within the limit of plus or minus two
percent (2%) of error. For the purposes of measurement and meter calibration,
the atmospheric pressure shall be assumed to be fourteen and seventy-three
hundredths (14.73) pounds per square inch, irrespective of variations in natural
atmospheric pressure from time to time. Company and Customer, upon request,
shall have the right to be present at any test of any measuring equipment,
including any check measuring equipment installed by Customer at its sole
expense.

General Terms - Page 7

<PAGE>

         5.4      If upon testing, the metering equipment is found to be
inaccurate, in the aggregate, by two percent (2%) or more, either plus or minus,
registration thereof and any payment based upon such registration shall be
corrected at the rate of such inaccuracy for any period of inaccuracy which is
definitely known or agreed upon, or if not known or agreed upon, then for a
period extending back one-half (1/2) of the time elapsed since the day of the
last calibration, not exceeding, however, forty-five (45) days. Following any
test, any metering equipment found to be inaccurate to any degree shall be
adjusted immediately to measure accurately; however, if any inaccuracy is less
than two percent (2%), all prior readings and measurements shall be deemed to
be accurate and no adjustments to any prior reading shall be made. If, for any
reason, any meter is registering inaccurately or is out of service or out of
repair so that the quantity of gas delivered through such meter cannot be
ascertained or computed from the readings thereof, the quantity of gas so
delivered during such period shall be estimated and agreed upon by the parties
hereto upon the basis of the best available data determined,

         a.       by using the registration of any check measuring equipment, if
                  installed and registering accurately or in the absence of (a);

         b.       by correcting the error if the percentage of error is
                  ascertainable by calibration, test, or mathematical
                  calculation, or in the absence of both (a) and (b);

General Terms - Page 8

<PAGE>

         c.       by estimating the quantity of gas deliveries by deliveries
                  during preceding periods under similar conditions when the
                  meter was registering accurately.

         5.5      The measurement hereunder shall be corrected for deviation
from Boyle's Law at the pressure and temperature under which gas is delivered
hereunder.

                                   ARTICLE VI

                             BILLINGS AND PAYMENTS

         6.1      On or before the first (1st) day of each month, Company shall
render to Customer an invoice for the storage charge (D(1)) and the
deliverability charge (D(2)) due hereunder for such month. Customer shall pay
such invoiced amounts on or before the fifteenth (15th) day of the month for
which such charges are due.

         6.2      On the tenth (10th) day of each month, Company shall render to
Customer a statement for the preceding month properly identifying the applicable
Point(s) of Delivery and Point(s) of Redelivery and showing the total quantity
of gas received from and delivered to Customer hereunder, the amounts due
pursuant to Sections 6.1(c) and 6.1(d) of the Gas Storage Contract therefor, the
amount of Customer's gas in storage as of the close of such month, and
information sufficient to explain and support any adjustments made by Company
(in accordance with section 6.4 below) in determining the amount billed.
Customer shall pay Company the full amount reflected on the statements rendered
within fifteen (15) days of its receipt of same. If the fifteenth (15th) day
shall fall upon a weekend or legal holiday, then such payment shall

General Terms - Page 9

<PAGE>

be made on the first regular business day following such fifteenth (15th) day.

         6.3      In the event that Customer fails to pay any amounts when due,
interest shall accrue on all unpaid amounts from the date due until paid at a
rate of interest equal to the lesser of: (i) the rate of interest quoted as the
"prime rate" of NCNB Texas National Bank -- Dallas, Texas to its largest and
most credit-worthy commercial customers; or (ii) the highest legal rate of
interest allowed by law.

         6.4      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 discovery of the error. In the event a dispute arises as to the
amount payable in any statement rendered, Customer shall pay the amount shown
payable to Company in the statement which is not in dispute. Any overcharges
collected by Company pursuant to this section 6.4 shall be remitted to Customer,
with interest, calculated as provided in section 6.3, from the date such
overcharges are received by Company until repaid. Such payment shall not be
deemed to be a waiver of the right by Customer to recoup any overpayment. All
statements shall be considered final, and any and all objections thereto be
deemed waived, unless made in writing within twenty-four (24) months of
Customer's receipt thereof.

General Terms - Page 10

<PAGE>

                                   ARTICLE VII

                                      TAXES

         7.1      Subject to the provisions of Section 7.3, Customer agrees to
pay to Company, by way of reimbursement, within fifteen (15) days of receipt of
an invoice for same (pro-rated among all customers), all new taxes enacted and
levied or imposed upon Company after the Commencement Date and, any increases in
existing taxes which may be made effective after the Commencement Date, which
arise out of the gas storage services provided hereunder. In the event that any
additional taxes or increases in taxes are imposed with respect to the storage
of gas hereunder and, should Company elect not to challenge the same, then
Customer shall be subrogated to Company's rights to challenge same.

         7.2      The term "taxes" as used herein, shall mean all taxes which
are now in existence or which may in the future be levied upon Company, or its
facilities or the storage of gas hereunder and arising out of the gas storage
services to be provided hereunder including, but not limited to, street and
alley rental tax, licenses, fees and any other taxes, charges or fees of any
kind levied, assessed or made by any governmental authority on the act, right or
privilege of transporting, handling or delivering gas or using Company's Storage
Facilities, which is measured by the volume, heating value, value of the gas, or
any fee in respect to the gas or the storage, transportation or other handling
thereof (excluding, however, real property, ad valorem, capital stock, income or
excess profit taxes, or general franchise taxes imposed

General Terms - Page 11

<PAGE>

on corporations on account of their corporate existence or on their right to do
business within the state as a foreign corporation and similar taxes).

         7.3      Customer shall not be obligated to reimburse Company pursuant
to Section 7.1 in any year in an amount in excess of five percent (5%) of the
cumulative total of the monthly demand charges paid by Customer to Company in
such year. In the event that the total of the increases in taxes and additional
taxes exceed such five percent (5%) amount, then Company shall have the option
of paying the same or of seeking a determination from the appropriate regulatory
agency that such additional taxes or increases in taxes are prudent and
appropriate for inclusion in Company's rates. Subject to the following
provisions, in the event that such regulatory agency determines that such
additional and increased taxes including, without limitation, those in excess of
said five percent (5%) amount, are appropriate for inclusion, Customer shall
have the option of either paying such approved rate increases or terminating
this Contract, upon providing Company sixty days' prior written notice;
provided, however, that upon receipt of Customer's notice of termination,
Company shall have the option, without obligation, to charge Customer an
increased amount which does not exceed such five percent (5%) amount and, in
such event, Customer's notice of termination shall be of no force or effect and
this Contract shall continue in accordance with its terms. Company shall provide
Customer written notice of any such election within such sixty (60) day period.
Customer shall be given notice and

General Terms - Page 12
<PAGE>

shall have the right to participate in such rate determination and oppose the
appropriateness of including the additional or increased taxes in Company's
rates.

                                  ARTICLE VIII

                               REGULATORY BODIES

         This Contract is subject to all present and future valid laws and
lawful orders of all regulatory bodies now or hereafter having jurisdiction of
either or both the parties; and should either of the parties, by force of any
such law or regulation imposed at any time during the term of this Contract, be
rendered unable, wholly or in part, to carry out its obligations under this
Contract, other than Customer's obligation to make payments due hereunder then,
this Contract shall continue nevertheless and shall then be deemed modified to
conform with the requirements of such law or regulation. Notwithstanding the
above, this Contract shall not be deemed to be so modified if such law or
regulation substantially and materially prohibits Company from providing
services to Customer hereunder substantially in accordance with the terms set
forth in this Contract and, in such event, Company and Customer shall negotiate
in good faith to amend the terms of this Contract such that such law or
regulation may be complied with and both Company and Customer will continue to
receive the rights and benefits herein provided. This Contract is expressly made
subject to any and all tariff and other filings made by Company and approved by
any federal or state regulatory body provided, that Company will not, without
Customer's consent, seek to alter the

General Terms - Page 13
Rev. 022790

<PAGE>

firm character of the storage services herein provided or to reduce the term of
this Contract. In the event that any regulatory body having jurisdiction over
this Contract prohibits Company from collecting rates for the services provided
hereunder which are at least equal to the rates and charges provided for in this
Contract, then Company shall have the right to terminate this Contract. In the
event that any regulatory body having jurisdiction requires Company to collect
rates for services provided hereunder which are in excess of the rates herein
provided, then Customer shall have the right to terminate this Contract.

                                   ARTICLE IX

                                  FORCE MAJEURE

         9.1      In the event of either party hereto being rendered unable,
wholly or in part, by force majeure to carry out its obligations under this
Contract, other than to make payments hereunder (except as provided in section
9.3 below), the obligations of the party, as far as they are affected by such
force majeure, shall be suspended during the continuance of any inability so
caused, but for no longer period, and such cause shall as far as possible be
remedied with all reasonable dispatch. The party so affected by such event of
force majeure shall give written notice, including reasonably full particulars
of such force majeure, in writing or by telegraph to the other party as soon as
possible but in no event more than ten (10) days after the occurrence of the
cause so relied upon.

General Terms - Page 14
Rev. 022790

<PAGE>

         9.2      The term "force majeure" as employed herein shall mean,
without limitation, acts of God, strikes, lockouts, or other industrial
disturbances, acts of the public enemy, wars, blockades, insurrection, riots,
epidemics, landslides, lightning, earthquakes, fires, storms, floods, washouts,
arrest and restraints of governments and people, civil disturbances, explosions,
breakage and/or accidents to machinery, lines or pipe, freezing of lines of
pipe, inability to obtain or delay in obtaining rights-of-way, material,
supplies, labor or permits, or refusal by pipelines, which are transporting on
Customer's behalf, to receive or deliver gas hereunder. It is understood and
agreed that the settlement of strikes or lockouts shall be entirely within the
discretion of the party having the difficulty, and that the above requirements
that any force majeure shall be remedied with all reasonable dispatch shall not
require the settlement of strikes or lockouts by acceding to the demands of any
opposing party when such course is inadvisable in the discretion of the party
having the difficulty. Company shall utilize all reasonable efforts to design,
operate and maintain its facilities in a manner which minimizes the potential
for freezing of wells or lines of pipe.

         9.3      In the event that Company is, due to an event of force
majeure, as herein defined, unable to provide storage services, in whole or in
part, under this Contract, then the obligation of Customer to make payment of
demand charges hereunder shall thereafter be waived or reduced proportionately
until service is again made available hereunder.

General Terms - Page 15
Rev. 022790

<PAGE>

                                    ARTICLE X

                             DEFAULT AND TERMINATION

         10.1     If either party hereto shall fail to perform any of the
covenants or obligations imposed upon it by virtue of this Contract (except
where such failure shall be excused under any of the provisions hereof), then in
such event the other party may, at its option, terminate this Contract by
proceeding as follows: the party not in default shall cause a written notice to
be served upon the party in default, stating specifically the cause for
terminating this Contract and declaring it to be the intention of the party
giving the notice to terminate the same; whereupon, the party in default shall
have thirty (30) days after receipt of the aforesaid notice in which to remedy
or remove the cause or causes of default stated in the notice of termination and
if, within said period of thirty (30) days, the party in default does so remedy
and remove said cause or causes, and fully indemnifies the party not in default,
then such notice shall be nullified and this Contract shall continue in full
force and effect. In the event the party in default does not so remedy and
remove the cause or causes of default, or does not fully indemnify the party
giving the notice for such party's actual damages as a result of such default
within said period of thirty (30) days, then this Contract shall become null and
void from and after the expiration of said period; provided, however, that if
such default be remedied but no indemnification therefor has been made due to a
bona fide dispute between the parties as to the amount thereof, then this
Contract

General Terms - Page 16
Rev. 027790

<PAGE>

shall not terminate, but the party not in default shall have the right to seek
recovery of its actual damages as provided by law. Any termination for breach of
this Contract shall be carried out strictly in accordance with this section.
Nothing in this Section 10.1 shall be construed to limit in any way the remedies
available to either party for breach of this Contract except for the right to
terminate.

         10.2     Any cancellation of this Contract pursuant to the provisions
of this Article X shall be without prejudice to the right of the party not in
default to collect any amounts then due it and without waiver of any other
remedy to which the party not in default may be entitled.

         10.3     In the event of termination, cancellation or expiration of
this Contract and, upon such occurrence, there is gas in storage for Customer's
account, this Contract shall continue in force and effect for the sole purpose
of withdrawal and delivery of and payment for storage services of said gas for
an additional ninety (90) days.

General Terms - Page 17
Rev. 021790

<PAGE>

                                   EXHIBIT "B"
                         TO GAS STORAGE CONTRACT BETWEEN
                    HATTIESBURG INDUSTRIAL GAS SALES COMPANY
                       AND MISSISSIPPI VALLEY GAS COMPANY
                           EFFECTIVE FEBRUARY 21, 1990

<TABLE>
<CAPTION>
                                                                Maximum Quantity
POINT(S) OF DELIVERY                                              (In MMBtu's)
--------------------                                            ----------------
<S>                                                             <C>
Interconnection between the Storage Facilities and the               5,000
pipeline facilities of Transco in Covington County,
Mississippi

Interconnection between the Storage Facilities and the               5,000
pipeline facilities of Tennessee in Forrest County,
Mississippi
</TABLE>

Gas may be scheduled for delivery at either or both of the Points of Delivery,
in quantities up to the maximum quantities indicated for each such point, but
the cumulative total of deliveries at both Points of Delivery shall not exceed
the MDIQ stated in the Contract, unless otherwise agreed by Company.

<TABLE>
<CAPTION>
                                                                Maximum Quantity
POINT(S) of REDELIVERY                                            (In MMBtu's)
----------------------                                          ----------------
<S>                                                             <C>
Interconnection between the Storage Facilities and the               10,000
pipeline facilities of Transco in Covington County,
Mississippi

Interconnection between the Storage Facilities and the               10,000
pipeline facilities of Tennessee in Forrest County,
Mississippi
</TABLE>

Gas may be scheduled for delivery at either or both of the Points of Redelivery,
in quantities up to the maximum quantities indicated for each such point, but
the cumulative total of deliveries at both Points of Redelivery shall not exceed
the MDWQ stated in the Contract, unless otherwise agreed by Company.

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