Petal Gas Storage Company

Original Volume No. 1

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Effective Date: 06/01/1998, Docket: RP97-280-001, Status: Effective

First Revised Sheet No. 4 First Revised Sheet No. 4 : Effective

Superseding: Original Sheet No. 4

Petal Gas Storage Company

ISS RATE STATEMENT - INTERRUPTIBLE STORAGE SERVICE*

RATE UNITS

Standby Capacity Market Based/ $/dth

Charge Negotiable per month

Paid on a monthly basis. Payment is equal to the Standby Capacity Charge

multiplied by Customer's Interruptible Storage Capacity.

Standby Deliverability Market Based/ $/dth

Charge Negotiable per month

Paid on a monthly basis. Payment is equal to the Standby Deliverability

Charge multiplied by Customer's Total Maximum Daily Withdrawal Quantity.

Storage Injection Market Based/ $/dth

Charge Negotiable

Paid on a monthly basis. Payment is equal to the Storage Injection Charge

multiplied by the dth quantity injected by the Customer during a given

month.

Overrun Injection Market Based/ $/dth

Charge Negotiable

Paid on a monthly basis. Payment is equal to the Overrun Injection Charge

multiplied by the dth quantity injected by Customer pursuant to Section

3.(a) under rate Schedule ISS.

Storage Withdrawal Market Based/ $/dth

Charge Negotiable

Paid on a monthly basis. Payment is equal to the Storage Withdrawal Charge

multiplied by the dth quantity withdrawn by Customer during a given month.

Overrun Withdrawal Market Based/ $/dth

Charge Negotiable

Paid on a monthly basis. Payment is equal to the Overrun Withdrawal Charge

multiplied by the dth quantity withdrawn by Customer pursuant to Section

3.(b) under Rate Schedule ISS.

Fuel Determined %

Reimbursement Annually

This incremental amount of gas is tendered along with the gas quantity to

be injected. The applicable Fuel Reimbursement is equal to the Fuel

Reimbursement percentage multiplied by the dth quantity injected per day.

* All quantities of natural gas are measured in dekatherms (dth).