Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

Effective Date: 08/01/2009, Docket: RP99-518-111, Status: Effective

Fourth Revised Sheet No. 25 Fourth Revised Sheet No. 25

Superseding: Third Revised Sheet No. 25

STATEMENT OF EFFECTIVE RATES AND CHARGES

FOR TRANSPORTATION OF NATURAL GAS

(Continued)

NEGOTIATED RATE AGREEMENTS UNDER RATE SCHEDULE ITS-1, PS-1, AND AIS-1

Explanatory Footnotes for Negotiated Rates under Rate Schedule ITS-1, PS-1,

and AIS-1

1/ This contract does not deviate in any material aspect from the Form of

Service Agreement in this Tariff.

2/ Unless otherwise noted, all Shippers pay GTN's maximum Mileage

and Non-Mileage Charge, ACA, and contribute fuel in-kind in accordance

with this Tariff.

3/ Index Price References: Unless otherwise noted, references to "Daily

Index Price" shall mean the price survey midpoint for the specified point

as published in Gas Daily for the day of gas flow. Weekend and holiday

prices will be determined using the next available Gas Daily publication.

Unless otherwise noted, the references to the "NGI FOM" for a specified

point shall mean Natural Gas Intelligence's First of Month Bid Week

Survey (Supplement to NGI's Weekly Gas Index) Spot Gas Price for the

specified point.

4/ This agreement is for service under GTN's Rate Schedule PS-1. The fee

charged for service under this agreement shall be determined as follows:

Maximum Allowable Total Quantity to be Parked: 150,000 Dth

Maximum Allowable Daily Quantity to be Parked: 20% above daily ratable

quantity (or as otherwise agreed upon by GTN and Powerex Corp.)

Allowable Period to Park Quantities: August 1-31, 2009

Allowable Period to Withdraw Parked Quantities: October 1-31, 2010

Total Charge USD (assessed September 2009): $323,000

Powerex Corp. shall use good faith efforts to park all gas on a ratable basis,

plus or minus 20%, or as otherwise mutually agreed and further subject to

GTN's ability to park such quantities at the receipt point(s) specified in

Powerex Corp.'s Parking Service Agreement. In addition, Powerex Corp. shall

use good faith efforts to withdraw all gas parked on a ratable basis, plus or

minus 20%, or as otherwise mutually agreed and further subject to GTN's

ability to redeliver such quantities at the same point(s) the gas was parked.

Any quantities Powerex Corp. parks on GTN's system in excess of the contracted

quantity between August 1, 2009, through August 31, 2009, and any quantities

parked in periods other than August 1, 2009, through August 31, 2009,

(continued)