Centerpoint Energy Gas Transmission Company

Sixth Revised Volume No. 1

Effective Date: 08/27/2008, Docket: RP08-456-000, Status: Effective

First Revised Sheet No. 111 First Revised Sheet No. 111

Superseding: Original Sheet No. 111

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

(continued)

5. MONTHLY BILL:

5.1 Calculation. The bill for a Service Month shall be the product of

the Commodity Rate and the total Dth of Gas delivered during the

Service Month, including any Overrun Gas, whether authorized or

unauthorized.

5.2 Adjustments.

(a) Excess Contract Quantities: Excess Contract Quantities

under Rate Schedule IT are those quantities that (i) exceed,

on any Day, one hundred two percent (102%) of Shipper's

Maximum Contract Quantity (or in the event of curtailment or

when Transporter has invoked the provisions of Section 20 of

the General Terms and Conditions, quantities that exceed

102% of the total quantity which Shipper is authorized to

transport); and (ii) are unauthorized Overrun Gas. Excess

Contract Quantities under Rate Schedule IT are categorized

by percentage of Shipper's scheduled quantities or other

authorized amount, as follows:

greater than 102% but less than or equal to 105%;

greater than 105% but less than or equal to 110%; and

greater than 110%.

If a Shipper's total Excess Contract Quantities under Rate

Schedule IT are less than both 50 Dth and 10% of its Maximum

Contract Quantity, Shipper shall not be assessed an Excess

Contract Quantities charge; provided, however, that such

exemption shall not be applicable in the event of

curtailment or if Transporter has invoked the provisions of

Section 20 of the General Terms and Conditions. For a

Service Month in which Excess Contract Quantities are

transported, Shipper shall be billed the sum of the products

of (x) the Excess Contract Quantities within each of the

above specified percentage ranges, multiplied by (y) the

applicable Excess Contract Quantities Rate, as specified in

Transporter's Statement of