Centerpoint Energy Gas Transmission Company

Sixth Revised Volume No. 1

Effective Date: 05/01/2010, Docket: RP10-567-000, Status: Effective

First Revised Sheet No. 210 First Revised Sheet No. 210

Superseding: Original Sheet No. 210

RATE SCHEDULE ISS

INTERRUPTIBLE STORAGE SERVICE

(continued)

2. APPLICABILITY AND CHARACTER OF SERVICE (continued)

2.1 Service hereunder shall consist of:

(a) the receipt of Gas by Transporter for Shipper's account at

the Storage Point(s) of Injection in quantities up to the

Interruptible Maximum Storage Quantity and at rates up to

the Interruptible Maximum Daily Injection Quantity in

accordance with a Service Agreement;

(b) the injection and storage of Gas in Transporter's storage

facilities by Transporter; and

the Storage Points of Withdrawal at rates up to the

Interruptible Maximum Daily Withdrawal Quantity, provided

that quantities requested by Shipper shall not exceed the

quantities stored on behalf of Shipper, in accordance with a

Service Agreement.

2.2 Service under this Rate Schedule shall be interruptible and

available only to the extent capacity is available for injection,

storage, and withdrawal of Gas. Transporter shall have no

obligation to provide service hereunder for or during any Day if

it determines that to do so may interfere with its ability to

provide firm service or to meet its other obligations or that it

may have an adverse effect on Transporter's operations. Service

under this Rate Schedule shall be interruptible up to the

Interruptible Maximum Daily Injection Quantity, and up to the

Interruptible Daily Withdrawal Quantity, as applicable, all in

accordance with the provisions of this Rate Schedule.

2.3 Service under this Rate Schedule does not include transportation

to or from storage. Shipper shall be responsible for making

arrangements for such transportation and such transportation shall

be pursuant to Transporter's Rate Schedule IT. Such

transportation shall be for at least the full term of the Service

Agreement under Rate Schedule ISS and shall be sufficient to