Western Gas Interstate Company

Fourth Revised Volume No. 1

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Effective Date: 11/01/2003, Docket: RP00-461-002, Status: Effective

Second Revised Sheet No. 229 Second Revised Sheet No. 229 : Effective

Superseding: First Revised Sheet No. 229

GENERAL TERMS AND CONDITIONS

(continued)

17.4 If, on any Day, Western determines that the

capacity of its mainline system, or any portion

thereof, is insufficient to serve all

transportation requirements which are or would

otherwise be scheduled to receive service on such

Day, capacity which requires allocation shall be

allocated in a manner which results in curtailment

of capacity as provided in Section 15 of the

General Terms and Conditions.

17.5 If, after the commencement of service in any given

month, Western finds that there exists on its

system, or any portion thereof, capacity in excess

of that required for gas scheduled, Western may

announce on its Internet Web site or other

means the availability of such capacity. Upon

such announcement, Western shall allocate such

excess capacity to Shippers that submit a request

in sequence as follows:

(a) First, among firm transportation Shippers;

(b) Second, among interruptible transportation

Shippers who nominated natural gas for

transportation in accordance with Section

19, and who failed to receive their

nominated quantities because of capacity

constraints on Western's system. Capacity

shall be allocated first-come, first-served

to any such Shippers based on the date that

Western receives a revised Nomination; and

(c) Third, to and among all other interruptible

transportation Shippers who submit a

Nomination on the basis of price.