Centerpoint Energy - Mississippi River

Third Revised Volume No. 1

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Effective Date: 11/01/1993, Docket: RS92- 43-006, Status: Effective

Original Sheet No. 53 Original Sheet No. 53 : Effective

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

1. AVAILABILITY

1.1 This rate schedule is available for the storage of natural

gas on an interruptible basis by MRT for any party (hereinafter referred

to as Customer) that submits a valid request as defined in Section 5 of

the General Terms and Conditions and enters into a contract with MRT for

Rate Schedule ISS service in the form set forth in this tariff (ISS

Agreement).

2. APPLICABILITY AND CHARACTER OF SERVICE

2.1 This rate schedule shall apply to interruptible storage

service rendered under an ISS Agreement executed by MRT and Customer, in

the form set forth in this tariff. The service shall be subject to the

terms of that ISS Agreement and this tariff.

2.2 Service hereunder shall consist of:

(a) The injection of quantities of natural gas into MRT's

storage fields for Customer's account, in accordance with Section

3 of this rate schedule;

(b) The storage of natural gas for Customer; and

(c) The withdrawal of stored quantities of natural gas, in

accordance with Section 4 of this rate schedule.

2.3 Service provided by MRT under this rate schedule shall be

rendered on an interruptible basis and shall be subject to allocation of

capacity and curtailment procedures as set forth in Sections 8 and 9 of

the General Terms and Conditions.

2.4 Service provided by MRT under this rate schedule shall be

interruptible, and may be interrupted whenever it is necessary for MRT

to provide higher priority service, or to maintain the integrity of

MRT's system or any part thereof.