Centerpoint Energy Gas Transmission Company

Sixth Revised Volume No. 1

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

First Revised Sheet No. 214 First Revised Sheet No. 214

Superseding: Original Sheet No. 214

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

(continued)

5. MONTHLY BILL (continued)

or withdrawal from storage in accordance with the Storage

Overrun Service provisions of this Rate Schedule.

5.2 Excess Service Charge.

Except as provided pursuant to the Storage Overrun Service provisions

of this Rate Schedule, or unless Transporter waives all or part of

such Excess Service Charge, if during any Service Month, Shipper

receives in excess of 102% of the Interruptible Maximum Daily

Withdrawal Quantity (or in the event of curtailment or when

Transporter has invoked the provisions of Section 20 of the General

Terms and Conditions, in excess of 102% of the total Dth which

Shipper is authorized to receive), then Shipper shall be billed an

amount equal to the product of the total Dth of Gas taken in excess

of 102% of the Interruptible Maximum Daily Withdrawal Quantity or

other authorized amount, as applicable, and the applicable Excess

Service Rate.

5.3 Storage Overrun Service.

Shipper may request, in accordance with the provisions of Section 5

of the General Terms and Conditions, or Transporter may consent, to

inject quantities of Gas for Shipper's account on any Day in excess

of the Interruptible Maximum Daily Injection Quantity or to withdraw

quantities of Gas from storage for Shipper on any Day in excess of

the Interruptible Maximum Daily Withdrawal Quantity. Transporter may

render the requested service on an interruptible basis if Transporter

determines that it can do so without adverse effect on its operations

or its ability to meet all its other obligations. Shipper shall pay

an Overrun Rate pursuant to Section 5 of this Rate Schedule for such

overrun service.