Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 10/01/2005, Docket: RP05-635-000, Status: Effective

First Revised Sheet No. 74 First Revised Sheet No. 74 : Effective

Superseding: Original Sheet No. 74

RATE SCHEDULE AIS-1

AUTHORIZED IMBALANCE SERVICE

(Continued)

3.1 NEGOTIATED RATES (continued)

Shippers paying a Negotiated Rate which exceeds the maximum applicable

tariff rate shall be considered to be paying the maximum applicable

tariff rate for purposes of scheduling, curtailment, and interruption,

and calculating the economic value of a request for available or

unsubscribed capacity.

4. AUTHORIZED IMBALANCE GENERAL TERMS AND CONDITIONS

All of the Transportation General Terms and Conditions except

Paragraphs 20, 22, 28, 31, 33, 35 and 36 are applicable to this rate

schedule, unless otherwise expressed in the executed Authorized

Imbalance Service Agreement between GTN and Shipper. Any future

modifications, additions or deletions to said Transportation General

Terms and Conditions, unless otherwise provided, are applicable to

interruptible scheduled imbalance service rendered under this rate

schedule, and, by this reference, are made a part hereof.