El Paso Natural Gas Company

Second Revised Volume No. 1A

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Effective Date: 04/01/2010, Docket: RP10-454-001, Status: Effective

Third Revised Sheet No. 147C.01 Third Revised Sheet No. 147C.01

Superseding: Second Revised Sheet No. 147C.01

RATE SCHEDULE ISS

Interruptible Storage Service

1. AVAILABILITY

This Rate Schedule is available to any Shipper for the storage of

Natural Gas on an interruptible basis by Transporter under the following

conditions:

1.1 Transporter determines it has sufficient operationally available and

uncommitted capacity to perform the interruptible storage service

requested;

1.2 Shipper has met the creditworthiness requirements of this Tariff;

1.3 Shipper has an Executed TSA for the interruptible storage service in

the form contained in this Tariff ("ISS TSA"); and

1.4 Shipper has an Executed TSA under Transporter's Rate Schedules FT-1,

FT-H, NNTD and/or NNTH ("Transport TSA") for the transportation of

gas to and from "Pipeline Storage". Such Transport TSA must be for a

term equal to or greater than the ISS TSA.

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 This Rate Schedule shall apply to all Natural Gas stored by

Transporter for Shipper pursuant to the executed ISS TSA.

2.2 Storage service hereunder shall be interruptible, subject to the

provisions of the Executed ISS TSA and to the GT&C incorporated

herein by reference.

2.3 Interruptible storage service hereunder shall consist of:

(a) Transporter injecting nominated and confirmed Natural Gas

quantities into storage on an interruptible basis;

(b) Transporter storing gas quantities on Shipper's behalf on an

interruptible basis; and

(c) Transporter withdrawing nominated and confirmed Natural Gas

quantities from storage on an interruptible basis.