Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 01/01/2007, Docket: RP06-407-008, Status: Pending

Substitute Original Sheet No. 138A Substitute Original Sheet No. 138A : Pending

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

18. OPERATING PROVISIONS (Continued)

18.3 Creditworthiness (Continued)

(D) Creditworthiness for Interruptible Transportation Service

(Continued)

(3)(b) (Continued)

(ii) A prepayment equal to an amount defined by Shipper.

Such defined balance prepayment will remain in place

until Shipper exhausts its prepaid balance by

utilizing interruptible transportation service. At

the point Shipper's prepayment is exhausted, GTN may

suspend further activity under an interruptible

Agreement collateralized by a prepayment. Shipper

will not earn interest on defined balance

prepayments.

(Continued)