Centerpoint Energy - Mississippi River

Third Revised Volume No. 1

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Effective Date: 04/01/2002, Docket: RP01-622-002, Status: Effective

First Revised Sheet No. 56 First Revised Sheet No. 56 : Effective

Superseding: Original Sheet No. 56

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

(Continued)

6. RATES AND CHARGES (Continued)

6.2 For all service rendered under this rate schedule Customers shall

pay MRT each month the sum of the following:

(a) Inventory Charge - A charge per month equal to the product

of the inventory rate and the Customer's average monthly inventory. The

average monthly inventory shall be the average of the Customer's highest

and lowest inventories during the month;

(b) Injection Charge - A charge equal to the product of the

injection rate and the total quantities of natural gas injected by MRT

on behalf of the Customer during the billing month;

(c) Withdrawal Charge - A charge equal to the product of the

withdrawal rate and the total quantities of natural gas withdrawn by MRT

on behalf of the Customer during the billing month;

(d) Authorized Overrun Charge - A charge equal to the product of

the applicable authorized overrun rate and any authorized overrun

quantities permitted by MRT during the billing month; and

(e) Other Fees and Charges - Other fees, charges, and penalties

which may be assessed as provided by the General Terms and Conditions

or which may be permitted by the Commission.

6.3 Customer shall reimburse MRT in kind for fuel usage and lost or

unaccounted for gas. MRT will retain the applicable Fuel Use and LUFG

Percentages of gas quantities delivered for injection into storage and of gas

volumes withdrawn from storage. The applicable Fuel Use and LUFG Percentages

are set forth on the currently effective Sheet No. 8 of this tariff.