Tres Palacios Gas Storage LLC

Original Volume No. 1

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Effective Date: 11/05/2009, Docket: RP10-33-000, Status: Effective

Second Revised Sheet No. 52 Second Revised Sheet No. 52

Superseding: First Revised Sheet No. 52

IW RATE SCHEDULE

INTERRUPTIBLE WHEELING SERVICE

1. AVAILABILITY

This Rate Schedule is available to any Customer for the

purchase of Interruptible Gas wheeling service from TRES PALACIOS,

provided that:

(a) TRES PALACIOS has determined that it has sufficient

operationally available Interruptible wheeling, receipt and

delivery capacity to perform service Customer has requested;

(b) TRES PALACIOS has determined that service Customer

has requested will not interfere with efficient operation of its

system or with Firm Storage Services;

(c) Customer and TRES PALACIOS have executed a Hub

Services Agreement under this Rate Schedule;

(d) Customer accepts responsibility for arranging any

upstream and/or downstream transportation service required for

utilization of the wheeling service provided under this Rate

Schedule; and

(e) Service under this Rate Schedule may not be

available to the extent that TRES PALACIOS would be required to

construct, modify, expand or acquire any facilities to enable TRES

PALACIOS to perform the requested services.

2. APPLICABILITY AND CHARACTER OF SERVICE

This Rate Schedule shall apply to all Interruptible wheeling

service rendered by TRES PALACIOS to Customer through use of TRES

PALACIOS' storage facility located in Texas pursuant to an

executed Hub Services Agreement.

Interruptible wheeling service rendered by TRES PALACIOS to

Customer under this Rate Schedule shall consist of the

transportation of Gas, on an Interruptible basis, by TRES PALACIOS

for Customer on TRES PALACIOS' system between agreed upon Point(s)

of Receipt and Point(s) of Delivery.

TRES PALACIOS shall, on an Interruptible basis, receive for

Customer at Point(s) of Receipt and shall transport and deliver at

the Point(s) of Delivery, less Fuel Reimbursement, daily

quantities of Gas up to the Maximum Daily Wheeling Quantity

("MDTQ") as specified in the Customer's Hub Services Agreement;

provided, however, TRES PALACIOS shall not be obligated to

receive, transport and/or deliver quantities of Gas on any Day in

excess of the quantity nominated and scheduled for that Day.

Interruptible wheeling service shall be available only in the

event that all Firm Storage Service needs have been satisfied.