Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 09/10/2009, Docket: RP99-518-112, Status: Effective

Sixth Revised Sheet No. 28 Sixth Revised Sheet No. 28

Superseding: Fifth Revised Sheet No. 28

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

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

charged for this 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: September 10, 2009 -

September 30, 2009

Allowable Period to Withdraw Parked Quantities: September 1, 2010 -

September 30, 2010

Total Charge USD (assessed October 2009): $339,000

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 September 10, 2009 through September 30, 2009, and any

quantities parked in periods other than September 10, 2009 through September

30, 2009 shall be subject to GTN's maximum tariff rate or other such generally

available system-wide discounted rate under rate schedule PS-1. Any

quantities withdrawn from GTN's Parking Service in September 2010 shall apply

first to the quantities subject to this agreement and second to any quantities

parked outside the bounds of this agreement.

GTN shall reimburse Powerex Corp. $0.20/Dth, up to the contracted quantity for

any difference between the actual parked quantity during September 10, 2009

through September 30, 2009 and the contracted quantity, applicable to any

nominated and otherwise confirmable quantities GTN was unable to park on its

system during September 10, 2009 through September 30, 2009, which may be

occasioned by restricted capacity, adverse inventory positions or GTN

scheduling errors. Powerex Corp. is obligated to make nominations on all

available nomination cycles during the day to be eligible for reimbursement.

Powerex Corp. shall have the right to request on subsequent days the makeup of

quantities GTN was unable to park.

GTN shall reimburse Powerex Corp. $0.20/Dth, up to the quantity actually

parked, for any quantities not withdrawn from GTN's system during September

2010 due to GTN's inability to accommodate a nominated and otherwise

confirmable withdrawal for that quantity during September 2010, which may be

occasioned by restricted capacity, adverse inventory positions or GTN

scheduling errors. Powerex Corp. is obligated to make nominations on all

available nomination cycles during the day to be eligible for reimbursement.

Powerex Corp. shall have the right to request on subsequent days the makeup of

quantities GTN was unable to withdraw.