Natural Gas Pipeline Company Of America

Seventh Revised Volume No. 1

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Effective Date: 04/18/2008, Docket: RP08-319-000, Status: Effective

Original Sheet No. 131 Original Sheet No. 131 : Pending

RATE SCHEDULE IBS

INTERRUPTIBLE BALANCING SERVICE

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(d) Natural shall tender an IBS Agreement to Shipper

for execution when Shipper's request for service is accepted. Unless

waived by Natural, a request for service shall be invalid if Shipper

fails to execute an IBS Agreement hereunder within ten (10) days

after an IBS Agreement which accurately reflects the requested

service has been tendered by Natural for execution.

3.2 Requests for service hereunder shall be deemed valid only

after the following information is provided by Shipper via Natural's

Interactive Website or in writing to Natural's Gas Transportation

Department at One Allen Center, 500 Dallas, Houston, Texas 77002, or

Telecopy Number (713)369-9325:

(a) LINKED TRANSPORTATION AGREEMENT

Shipper shall identify in its request an FTS, FTS-G

or ITS Agreement to which service hereunder will be linked. Such

linkage must be consistent with the Rate Schedule IBS. The balancing

service hereunder shall relate to the volumes delivered to the

Delivery Point(s) on behalf of the end-use facility or facilities

under the linked transportation Agreement. The effectiveness of the

IBS Agreement is contingent upon Shipper having and continuing in

effect the linked FTS, FTS-G or ITS Agreement, unless the parties

agree on a substitute linked transportation Agreement. The linked

transportation Agreement may be a released transportation Agreement

but the Replacement Shipper must enter into a separate IBS Agreement;

it cannot rely on the IBS Agreement of the Releasing Shipper.

(b) CONTRACT QUANTITY

The request must specify the MDQ under the IBS

Agreement. The MDQ of the IBS Agreement may be equal to or less than

the MDQ of the linked transportation Agreement. If the transportation

Agreement is linked to more than one IBS Agreement, then the sum of

the MDQs under IBS Agreements served by that linked transportation

Agreement must be equal to or less than the transportation contract