Southwest Gas Storage Company

Original Volume No. 1

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

Original Sheet No. 92 Original Sheet No. 92 : Superseded

RATE SCHEDULE ISS (Continued)

INTERRUPTIBLE STORAGE SERVICE

4. MONTHLY BILL

The Monthly Bill for storage service shall be the sum of the

applicable Storage charges as defined in Section 3.1, the ACA Unit

Charge, and an Authorized Overrun Charge, if applicable.

5. RESERVATIONS

Seller reserves the unilateral right from time to time to make

any changes to, or to supersede, the rates and charges and other

terms in this Rate Schedule and the other provisions of Seller's

FERC Gas Tariff, and the applicability thereof, subject to the

provisions of the Natural Gas Act, the Natural Gas Policy Act and

the Commission's Regulations thereunder.

6. GENERAL TERMS AND CONDITIONS

The following General Terms and Conditions are applicable to

storage service provided hereunder:

6.1 Definitions

(a) Day shall mean a period of twenty-four (24)

consecutive hours beginning and ending at 8:00 A.M.

Central Time. The reference date for any day shall

be the date of the beginning of such day. ("Month"

and "years" shall also commence at 8:00 A.M.).

(b) Business Day shall mean from 8:00 A.M. to 5:00

P.M., Central Time on any day except Saturday,

Sunday, and holidays observed by Seller.