Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

Effective Date: 01/01/2007, Docket: RP06-407-000, Status: Effective

First Revised Sheet No. 135A First Revised Sheet No. 135A : Effective

Superseding: Original Sheet No. 135A

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

18. OPERATING PROVISIONS (Continued)

18.3 Creditworthiness (Continued)

(A) Creditworthiness for Firm Transportation Service (Continued)

(2) (Continued)

GTN either in writing or by fax that it has returned to

creditworthiness, as evidenced by a rating for

unenhanced senior unsecured debt and consistent with

Paragraph 18.3(A)(1)(a) herein, and provided that

Shipper's credit limit is adequate to cover its

contractual obligations, GTN will return, with any

applicable interest, Shipper's security held by GTN

along with reconciliations of interest calculations.

Upon the expiration of Shipper's Agreement(s), GTN

will return, with any applicable interest, Shipper's

security associated with undisputed invoice amounts

within five (5) business days of Shipper paying its

final invoice. Any remaining security will be

returned with interest after resolving any and all

disputed invoice amounts under the expired

Agreement(s). GTN will provide Shipper with final

billing reconciliations detailing interest

calculations.

(B) Credit Standards for Capacity Release

(1) Long Term Capacity Release: The standards for Firm

Transportation Service apply. However, pursuant to

Paragraph 28.3 of this FERC Gas Tariff, a Releasing Shipper

has the option of waiving the creditworthiness requirements

for temporary releases of capacity for as long as the

Releasing Shipper maintains compliance with GTN's