Reliant Energy Gas Transmission Company

Fifth Revised Volume No. 1

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Effective Date: 06/01/2002, Docket: RP00-482-004, Status: Effective

Substitute First Revised Sheet No. 171 Substitute First Revised Sheet No. 171 : Effective

Superseding: First Revised Original Sheet No. 171

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

(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