West Texas Gas, Inc.

First Revised Volume No. 1

Effective Date: 05/01/1998, Docket: RP98- 25-005, Status: Effective

Substitute Second Revised Sheet No. 7 Substitute Second Revised Sheet No. 7 : Effective

Superseding: Substitute First Revised Sheet No. 7

RATE SCHEDULE IS-1

INTERRUPTIBLE SERVICE

(Continued)

3. Rate: The rate for volumes delivered under Rate Schedule IS-1 shall be

the applicable "Total Rate" as shown on the effective Sheet No. 4 of

Seller's FERC Gas Tariff, First Revised Volume No. 1.

4. Minimum Bill: None.

5. Determination of Deliveries: The volume og gas delivered under this

rate schedule on any day shall be that volume of gas in excess of

Buyer's entitlement at any point under Rate Schedule FS-1, as measured

by meters of Buyer, computed in accordance with Section 3 of the

General Terms and Conditions.

6. Unauthorized Overrun Gas: In the event that Buyer fails to curtail and

discontinue use of gas within the specified period after notice by

Seller, given pursuant to Section 2.3 of this rate schedule, the total

amount which Buyer takes and fails to curtail shall be billed by Seller

and paid for by Buyer at a price of $10.00 per dth for all such

unauthorized overrun gas in addition to all other charges payable by

Buyer hereunder.

7. Unit of Measurement: See Section 3 of the General Terms and Conditions.

8. Heat Content: The heat content of the gas delivered hereunder shall not

be less than 963 BTU per cubic foot nor more than 1,033 BTU per

cubic foot.

9. General Terms and Conditions: The General Terms and Conditions are

applicable to this rate schedule and are hereby made a part hereof.