Southwest Gas Storage Company

First Revised Volume No. 1

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Effective Date: 12/15/1999, Docket: RP00- 58-000, Status: Effective

Original Sheet No. 114 Original Sheet No. 114 : Effective

GENERAL TERMS AND CONDITIONS

(Continued)

4. CURTAILMENT AND INTERRUPTION

Southwest shall have the right to curtail, interrupt or discontinue

service in whole or in part on its system at any time under the

following conditions and in the following manner:

4.1 Operating or remedial curtailment or interruption may be ordered

by Southwest at any time if in Southwest's judgment capacity or

operating conditions so require or it is desirable or necessary to

make modifications, repairs or operating changes, the conduct of

which will be affected thereby, upon such notice as is reasonable

under the circumstances and in the following order, to the extent

practicable:

(A)Interruptible storage service shall be curtailed first,

commencing with service that at the time notice was given was

being charged at a rate that is less than the Maximum Rate of

Southwest then in effect under this Tariff in sequence

starting with the rate least proximate to the Maximum Rate and

then with service which was initially provided most proximate

to the date notice is given by Southwest of the particular

curtailment or interruption; next in order shall be all other

interruptible storage service in sequence starting with

service which was initially provided most proximate to the

date notice is given by Southwest of the particular

curtailment or interruption. In the event Shipper is

receiving service at less than the applicable Maximum Rate and

Southwest determines that interruption or curtailment of

service is required, Southwest shall notify Shipper that

Shipper will be required to pay the applicable Maximum Rate in

order to avoid interruption or curtailment of service to the

extent that any interruptible service is available as

determined by Southwest. Shipper's election to pay the

applicable Maximum Rate shall be a one-time election effective

during such periods of interruption or curtailment regardless

of duration. Shipper's election shall be made at the time

Southwest and Shipper agree to such discounted rate.

(B)Firm storage service shall be curtailed last on a pro-rata

basis. Such proration shall be based on Southwest's maximum

firm contractual obligations to provide firm service.