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. 20 Original Sheet No. 20 : Effective

RATE SCHEDULE FSS

FIRM STORAGE SERVICE

1. AVAILABILITY

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

purchase of natural gas storage service on a firm 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 firm 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.