Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 04/23/2008, Docket: RP99-518-105, Status: Pending

Eighth Revised Sheet No. 27 Eighth Revised Sheet No. 27 : Pending

Superseding: Seventh Revised Sheet No. 27

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

5/ 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: 250,000 Dth

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

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

Allowable Period to Park Quantities: April 23, 2008 - May 23, 2008

Allowable Period to Withdraw Parked Quantities: January 1-31, 2009

Total Charge US$ (assessed June 2008): $241,250

Powerex Corp. ("Powerex") shall use good faith efforts to park all gas on a

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

use good faith efforts to withdraw all gas parked on a rateable 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 parks on GTN's system in excess of the contracted

quantity between April 23, 2008, through May 23, 2008, and any quantities

parked in periods other than April 23, 2008, through May 23, 2008, 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 Any quantities withdrawn from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 January 2009 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 $0.20/Dth, up to the contracted quantity for any

difference between the actual parked quantity during April 23, 2008, through

May 23, 2008, and the contracted quantity, applicable to any nominated and

otherwise confirmable quantities GTN was unable to park on its system during

April 23, 2008, through May 23, 2008, which may be occasioned by restricted

capacity, adverse inventory positions or GTN scheduling errors. Powerex is

obligated to make nominations on all available nomination cycles during the

day to be eligible for reimbursement. Powerex shall have the right to request

on subsequent days the makeup of quantities GTN was unable to park.

GTN shall reimburse Powerex $0.20/Dth, up to the quantity actually parked, for

any quantities not withdrawn from GTN's system during January 2009 due to

GTN's inability to accommodate a nominated and otherwise confirmable

withdrawal for that quantity during January 2009, which may be occasioned by

restricted capacity, adverse inventory positions, or GTN scheduling errors.

Powerex is obligated to make nominations on all available nomination cycles

during the day to be eligible for reimbursement. Powerex shall have the right

to request on subsequent days the makeup of quantities GTN was unable to

withdraw.

6/ Reserved