Southwest Gas Storage Company

Original Volume No. 1

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Effective Date: 01/20/1991, Docket: CP90-1014-002, Status: Effective

Original Sheet No. 90 Original Sheet No. 90 : Superseded

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

1. AVAILABILITY

This Rate Schedule ISS is available to any person ("Buyer")

for the purchase of natural gas storage service on an interruptible

basis from Southwest Gas Storage Company ("Seller") under the

provisions of Seller's blanket storage certificate issued in

Docket No. CP90-1014 upon execution of a Storage

Service Agreement in the form provided for in this tariff.

Buyer shall arrange separately for any transportation

attendant to the storage service provided hereunder and Buyer shall

pay separately for such transportation services.

2. APPLICABILITY AND CHARACTER OF SERVICE

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 for herein, subject to the availability of capacity, the

General Terms and Conditions herein and the further provisions of

the Storage Service Agreement. Seller 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.

3. RATE

The rates and charges for interruptible service under this

Rate Schedule shall include the applicable storage rate

component(s) per Dt., as described in Sections 3.1, 3.2 and 3.3.

3.1 Storage Charges

For storage service rendered to Buyer under this Rate

Schedule ISS, Buyer shall pay Seller each month the

Inventory Charge. The monthly charge per Dt. is

determined by multiplying the Average Storage Gas

Balance for the billing month by the Inventory Charge

rate as set forth on the effective Tariff Sheet No.

4-B of this Tariff.