Southern Natural Gas Company

Seventh Revised Volume No. 1

Effective Date: 11/29/1999, Docket: RP00- 52-000, Status: Effective

First Revised Sheet No. 82 First Revised Sheet No. 82 : Effective

Superseding: Original Sheet No. 82

RATE SCHEDULE ISS

Interruptible Storage Service

1. AVAILABILITY

(a) This Rate Schedule is available to any person ("SHIPPER") who requests

storage of natural gas on an interruptible basis from Southern Natural Gas

Company ("COMPANY") provided that:

(i) COMPANY has sufficient capacity and is able to provide the

storage service requested;

(ii) SHIPPER has complied with the requirements of Section 7 hereof;

and

(iii)SHIPPER and COMPANY have executed a Service Agreement for

service under this Rate Schedule.

(b) COMPANY will utilize its Muldon Storage Field in Mississippi and/or its

interest in the Bear Creek Storage Field in Louisiana (collectively

"Storage") to provide service under this Rate Schedule.

perform storage services under this Rate Schedule. In the event that

COMPANY determines that it will construct facilities that will result

in the expansion of its pipeline system, COMPANY shall offer the proposed

expansion capacity to all shippers on a non-discriminatory basis.

(d) SHIPPER is responsible for arranging for the separate transportation of its

gas to and from Storage.

2. APPLICABILITY AND CHARACTER OF SERVICE

(a) This Rate Schedule shall apply to all interruptible storage services

rendered by COMPANY for SHIPPER pursuant to Part 284 of the Federal

Energy Regulatory Commission's ("Commission") Regulations and pursuant

to the Service Agreement for storage service under this Rate Schedule.

(b) The injection and withdrawal of the gas received by COMPANY on

SHIPPER'S behalf for storage under this Rate Schedule shall be on an

interruptible basis. Service hereunder may be interrupted pursuant to

Section 8.3 of the General Terms and Conditions and on four (4)