Tres Palacios Gas Storage LLC

Original Volume No. 1

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Effective Date: 07/25/2009, Docket: RP09-260-000, Status: Effective

Original Sheet No. 237A Original Sheet No. 237A

Exhibit A to the

Interruptible Hourly Balancing Storage Service Agreement

between TRES PALACIOS and

____________________(Customer)

Transaction Confirmation

Maximum Storage Quantity ("MSQ") __________ Dth

Maximum Daily Injection Quantity ("MDIQ") __________ Dth

Maximum Daily Withdrawal Quantity ("MDWQ") __________ Dth

Maximum Hourly IHBS Quantity __________ Dth

Start Date ____________________

End Date ____________________

Hourly Balancing Charge __________ $/Dth

Storage Inventory Charge __________ $/Dth

Injection Charge __________ $/Dth

Withdrawal Charge __________ $/Dth

Fuel Reimbursement __________

Customer:

Signature:_____________________________

Date:____________________

TRES PALACIOS' Approval:

Signature:_____________________________

Date:____________________

Note: TRES PALACIOS and Customer may enter into a transaction for

storage or hub services pursuant to the Transaction Confirmation

Procedure set forth at Section 34 of the General Terms and

Conditions of TRES PALACIOS' FERC Gas Tariff.