Petal Gas Storage, L. L. C.

Original Volume No. 1

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Effective Date: 01/09/2010, Docket: RP10-229-000, Status: Effective

Third Revised Sheet No. 50 Third Revised Sheet No. 50

Superseding: Second Revised Sheet No. 50

ISS RATE SCHEDULE

INTERRUPTIBLE STORAGE SERVICE

1. AVAILABILITY

This rate schedule is available to any Customer for the purchase of interruptible

natural gas storage service from Petal given that:

(a) Petal has determined that it has sufficient operationally available

capacity to perform service requested by Customer;

(b) Petal has determined that service requested by Customer will not

interfere with efficient operation of its system or with service to

firm storage customers under Rate Schedules FSS or FSS-1;

(c) Customer and Petal have executed an interruptible storage service

agreement under this rate schedule;

(d) Customer accepts responsibility for arranging any transportation

service required for utilization of the storage service provided under

this rate schedule; and

(e) Customer satisfies the creditworthiness criteria in accordance with

Section 3 of the General Terms and Conditions.

2. APPLICABILITY AND CHARACTER OF SERVICE

This rate schedule shall apply to all interruptible storage service rendered by

Petal to Customer pursuant to an executed interruptible storage service

agreement.

Interruptible storage service rendered by Petal to Customer under this rate

schedule shall consist of:

(a) The daily injection of Customer's gas per Customer's nomination up to

the Total Maximum Daily Injection Quantity ("TMDIQ") stated in the

executed interruptible storage agreement with Customer, plus any

authorized overrun injection quantity, provided that all firm service

customer nominations for injection have been satisfied, that Customer

has interruptible Storage Capacity available and Customer delivers the

nominated quantity plus fuel to the Point(s) of Receipt;