Natural Gas Pipeline Company Of America

Seventh Revised Volume No. 1

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

Original Sheet No. 129 Original Sheet No. 129 : Pending

RATE SCHEDULE IBS

INTERRUPTIBLE BALANCING SERVICE

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capability and on offsetting Access Requests under Section 6 of this

Rate Schedule IBS. Natural is not providing a supply or storage

service under this Rate Schedule IBS.

(b) This service is designed to help a Shipper accommodate

differences between nominations and physical gas flows to specified

end-use facilities under the FTS, FTS-G or ITS Agreement to which the

IBS Agreement is linked consistent with Section 3.2(a) of this Rate

Schedule IBS.

hereunder in excess of the maximum daily access volume under the IBS

Agreement as determined under Section 6(a) hereof or in excess of the

maximum allowable cumulative IBS Balance as determined under Section

6(f) hereof; (2) to provide service hereunder on any day in excess of

the MDQ of the IBS Agreement, reduced in the case of a swing up by

the volumes nominated under the linked transportation Agreement for

that day (and further reduced by releases of the linked

transportation Agreement where applicable); or (3) to provide service

hereunder which is not consistent with a confirmed Access Request

pursuant to Section 6 of this Rate Schedule IBS.

(d) The service provided under this Rate Schedule IBS shall

be performed under Part 284 of the Commission's Regulations. Shipper

shall only request service under this Rate Schedule IBS to the extent

such service would qualify under the applicable statutes,

regulations, Commission orders and the blanket certificate

authorizing service by Natural under this Rate Schedule. For service

under Subpart B of Part 284 of the Commission's Regulations, Shipper

shall provide to Natural appropriate certification, including

sufficient information in order for Natural to verify that the

service qualifies under Subpart B of Part 284 of the Regulations.

Where required by the Commission's Regulations, Shipper shall (prior

to tendering gas under an IBS Agreement) cause the intrastate

pipeline or local distribution company on whose behalf the service

will be provided to submit the necessary certification.

(e) Service hereunder is provided on an interruptible basis.

Priorities of service for the purposes of scheduling and curtailment

are governed by the General Terms and Conditions of this Tariff.

Natural will only provide service hereunder if the standard set out

in Section 6(b) hereof is met.