Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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

Third Revised Sheet No. 141 Third Revised Sheet No. 141 : Effective

Superseding: Second Revised Sheet No. 141

TRANSPORTATION GENERAL TERMS AND CONDITIONS

(Continued)

18. OPERATING PROVISIONS (Continued)

18.3 Creditworthiness (Continued)

(F) Creditworthiness for Imbalance Gas Owed to GTN

The standards for Interruptible Transportation Service apply

to negative imbalances under GTN Rate Schedules. For negative

imbalances, the security requirement under the cash and Letter

of Credit options includes an amount to adequately account for

the value of imbalance gas owed to GTN. The amount of

security necessary to collateralize imbalance gas will be

determined as follows:

(1) For existing Shippers that do not meet GTN's

creditworthiness standards, the security requirement shall

be up to the product of a Shipper's largest monthly

negative imbalance over the most recent twelve (12) month

period and the average of NYMEX future prices for the

available twelve (12) month period as such prices close on

the day the credit requirement is determined.

(2) For new Shippers that do not meet GTN's creditworthiness

standards, the security requirement shall be up to the

product of ten (10) percent of a Shipper's estimated

monthly usage (as estimated by GTN) and the average of

NYMEX future prices for the available twelve (12) month

period as such prices close on the day the credit

requirement is determined. This formula shall be used for

the first twelve (12) months of service while a historical

record is established; thereafter, security for such

Shipper will be determined as specified for an existing

Shipper that does not meet GTN's creditworthiness

standards.

(G) Creditworthiness for Firm and Interruptible Transportation

Service

(1) GTN's credit appraisal procedures involve the

establishment of dollar and term of service credit limits

on a nondiscriminatory basis. Credit limits will reflect

an annual dollar amount and a maximum term. If Shipper

provides a guarantee, GTN will set a credit limit for the

shipper based upon a credit appraisal of the guarantor.

Credit limits may be modified by GTN when Shipper's

financial conditions change.

(Continued)