Southwest Gas Storage Company

First Revised Volume No. 1

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Effective Date: 10/01/2007, Docket: RP07-684-000, Status: Effective

Second Revised Sheet No. 213 Second Revised Sheet No. 213 : Effective

Superseding: First Revised Sheet No. 213

FORM OF AGREEMENT

FOR MESSENGER

(Continued)

Authorized Use of Messenger ; Confidentiality

Use of the Messenger system by Messenger Subscriber shall be

limited only to those persons who have been duly authorized by Messenger

Subscriber to use the Messenger system (the "Authorized Personnel"), as

indicated in the completed Computer Access Request Form to be submitted by

Messenger Subscriber to Pipeline, a copy of which is attached to the

Messenger Agreement. Pipeline will provide each of Messenger

Subscriber's Authorized Personnel with an individualized user

identification code ("USERID") and password. The number and type of

USERIDs and passwords to be issued by Pipeline shall be subject to the

sole discretion of Pipeline.

Messenger Subscriber shall also designate one or more Authorized

Personnel who are additionally authorized: (1) to transmit information to

Pipeline through the Messenger system, and/or (2) to perform the

contracting function and thereby legally bind Messenger Subscriber to any

Service Agreement or amended Service Agreement entered into with Pipeline

(collectively, the "Designated Personnel"). Pipeline shall be entitled to

rely upon Messenger Subscriber's representation that any and all

Designated Personnel authorized to perform the Messenger system

contracting function have been duly authorized by Messenger Subscriber to

enter into one or more Service Agreements or amended Service Agreements

for all purposes of this Messenger Agreement.