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. 142 Original Sheet No. 142 : Pending

RATE SCHEDULE IBS

INTERRUPTIBLE BALANCING SERVICE

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Balance, Shipper shall be obligated to make a timely IBS Payback

nomination under the linked transportation Agreement based on such

timely information provided by Natural in the next daily nomination

cycle up to its MDQ under the linked transportation Agreement to bring

its IBS Balance for a day to zero (IBS Payback nomination). Such IBS

Payback nominations may also be made at the time intraday nominations

are due under the next daily nomination cycle. Natural may adjust such

IBS Balance information in future periods and Shipper's future payback

obligations shall be adjusted accordingly, but Shipper may rely on any

information provided by Natural in making IBS Payback nominations. The

IBS Payback nomination shall be separately identified and shall be a

volume which is in excess of Shipper's projected requirements for that

day at the relevant end-use facility or facilities. The IBS Payback

nomination may represent (in whole or in part) overrun under the linked

transportation Agreement, in which case the overrun shall be evaluated

by Natural for scheduling purposes on the same basis as other overrun

requests.

(1) IBS Payback nominations must reference the IBS

Agreement. IBS Payback must be made to deliver gas to or take gas away

from Delivery Points, as applicable, under the linked transportation

Agreement, or at other mutually agreed points if delivery to those

points would be beneficial to Natural's system, to achieve IBS Payback

in relation to the Delivery Point(s). IBS Payback nominations shall be

evaluated for scheduling and curtailment priority purposes on the same

basis as other nominations under the linked transportation Agreement or

at the mutually agreed points. Transportation charges shall be assessed

under the linked transportation Agreement only if movement of the gas to

the Delivery Point(s) has not previously been subject to a

transportation charge, consistent with Section 5.3 of this Rate Schedule

IBS.

(2) Natural has the right to delay or limit IBS

Payback. To the extent Natural does not confirm an IBS Payback

nomination, or the nomination is limited by MDQ under the IBS Agreement,

Shipper shall be obligated to make a timely IBS Payback nomination in

each subsequent daily nomination period until the IBS Balance for that

day has been eliminated; provided, however, that if Natural advises

Shipper that no IBS Payback nominations will be accepted until a

specified future date or will be limited in a specified way over a

defined period, Shipper may forego or limit its IBS Payback nomination

accordingly.