Centerpoint Energy Gas Transmission Company

Sixth Revised Volume No. 1

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Effective Date: 05/01/2010, Docket: RP10-567-000, Status: Effective

First Revised Sheet No. 213 First Revised Sheet No. 213

Superseding: Original Sheet No. 213

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

(continued)

3. RATES (continued)

(b) Overrun Rate: The currently effective Overrun Rate shown in

Transporter's Statement of Effective Rates and Charges for

Transportation of Gas contained in this Tariff, if

applicable.

(c) Excess Service Rate: The currently effective Excess Service

Rate shown in Transporter's Statement of Effective Rates and

Charges for Transportation of Gas contained in this Tariff,

as applicable.

3.2 Storage Fuel Use and LUFG: Shipper shall provide Storage Fuel Use

and LUFG in-kind in the percentage shown in Transporter's

Statement of Effective Rates and Charges for Transportation of Gas

contained in this Tariff for all quantities scheduled and/or

received for injection into storage.

4. FLEXIBILITY OF RATES:

The applicable maximum (Base Rate plus other applicable charges) and

minimum rates and charges for service under this Rate Schedule are

specified in Transporter's Statement of Effective Rates and Charges for

Transportation of Gas, as on file and in effect from time to time, in

this Tariff. Any discount from the maximum rate applicable to any

service shall be in accordance with terms and conditions agreed to and

as specified by Transporter. Said rates are subject to adjustment as

provided in the General Terms and Conditions.

5. MONTHLY BILL:

5.1 Calculation.

The bill for the Service Month shall be the sum of:

(a) The product of the Interruptible Storage Rate and the total

Dth of Gas scheduled and received for injection into storage

during the Service Month;

(b) The product of the Overrun Rate and each Dth of Gas

scheduled during the Service Month for either injection into