Centerpoint Energy Gas Transmission Company

Sixth Revised Volume No. 1

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Effective Date: 08/26/2009, Docket: RP09-843-000, Status: Effective

Third Revised Sheet No. 273 Third Revised Sheet No. 273

Superseding: Second Revised Sheet No. 273

RATE SCHEDULE PHS

PERRYVILLE HUB® SERVICE

(continued)

5. MONTHLY BILL:

5.1 Calculation: The bill for a Service Month shall be the sum of:

(a) For Wheeling service:

(i) Firm Wheeling: The product of the Firm Wheeling Rate

and each Dth of Contract Demand.

(ii) Overrun Rate: The product of the Overrun Rate and the

total Dth of Gas delivered in excess of MDO under firm

wheeling transactions, whether authorized or

unauthorized; and

(iii) Interruptible Wheeling: The product of the

Interruptible Wheeling Rate and the total Dth of Gas

delivered under interruptible wheeling transactions

during the Service Month, whether authorized or

unauthorized; and

(b) For park and loan service:

(i) for each account, the product of the Activity Rate and

the total Dth of Gas initially loaned or parked,

and/or returned or taken delivery of, on each Day,

plus

(ii) the product of the Inventory Rate and the total Dth of

parked or loaned Gas in each account at the end of

each Day excluding the quantities subject to the

Activity Rate on such Day, on a first-in, first-out

basis (for parking) and a first-out, first-in basis

(for loaning).