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

Sub Second Revised Sheet No. 141A Sub Second Revised Sheet No. 141A : Pending

Superseding: First Revised Sheet No. 141A

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

18. OPERATING PROVISIONS (Continued)

18.3 Creditworthiness (Continued)

(G) Creditworthiness for Firm and Interruptible Transportation

Service

(1) Shipper's total contractual obligation is the present value

of all firm contracts, plus the amount necessary to

collateralize all of a Shipper's interruptible

transportation agreements.

(2) Shipper's total security requirement is the amount necessary

to collateralize all of a Shipper's firm and interruptible

transportation agreements.

(3) Subject to the requirements of Section 7 of the Natural Gas

Act, GTN shall not be required to perform or to continue to

perform service on behalf of any Customer who fails to

demonstrate minimal creditworthiness as required under this

FERC Gas Tariff; provided, however, such Customer may

receive service if said Customer provides alternative credit

as described within Paragraphs 18.3(A)(1), 18.3(D)(2), and

18.3(E) of these Transportation General Terms and

Conditions.

18.4 Upon request of GTN, Shipper shall from time to time submit

estimates of daily, monthly and annual quantities of gas to be

transported, including peak day requirements.

18.5 GTN shall not be obligated to install additional facilities, other

than those specified in Paragraph 4.1 herein, that are required to

provide service under this FERC Gas Tariff, Third Revised Volume

No. 1-A; provided, however, GTN may install or Shipper may pay all

of the expenses incurred for installing additional facilities on a

nondiscriminatory basis and under terms that are mutually

agreeable. In the event GTN incurs the cost of installing

additional facilities on behalf of a Shipper, Shipper shall pay,

in addition to the rate(s) stated in the applicable rate schedule,

the prorated (based on Transportation Contract Demand) cost of

service attributable to any such additional facilities until such

time as a different allocation procedure is specified by

Commission order.