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. 26 Original Sheet No. 26 : Effective

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

1. AVAILABILITY

This Rate Schedule ISS is available to any person (Shipper) for the

purchase of natural gas storage service on an interruptible basis from

Southwest Gas Storage Company (Southwest) upon execution of a Storage

Service Agreement in the form provided for in this Tariff.

Shipper shall arrange separately for any transportation attendant to

the storage service provided hereunder and Shipper shall pay separately

for such transportation services.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 The interruptible service rendered hereunder is the storage of

natural gas up to a Maximum Annual Quantity (MAQ) as set forth in

the Storage Service Agreement, with a Maximum Daily Withdrawal

Quantity (MWQ) and a Maximum Daily Injection Quantity (MIQ) as

provided herein, subject to the availability of capacity, the

General Terms and Conditions and the further provisions of the

Storage Service Agreement. Southwest is not obligated to provide

any storage service for which capacity is not available, which

would constrain the operational efficiency of its facilities, or

which would require the construction, purchase or acquisition of

new facilities or the modification or expansion of existing

facilities.

2.2 Injections into Storage

(A) Shipper's MIQ shall be:

(1) West Area Storage Facilities

(a) 1/180th of the MAQ until ninety percent (90%) of

the MAQ has been injected;

(b) Thereafter sixty percent (60%) of the volume

specified in 2.2(A)(1)(a) above until ninety-five

percent (95%) of the MAQ has been injected;

(c) Thereafter thirty-five percent (35%) of the volume

specified in 2.2(A)(1)(a) above.