Portland Natural Gas Transmission System

Second Revised Volume No. 1

Effective Date: 09/01/2006, Docket: RP06-449-000, Status: Effective

Original Sheet No. 529 Original Sheet No. 529 : Effective

WHEREAS Transporter and Replacement Shipper now desire to establish the

terms and conditions under which Transporter will render firm services to

Replacement Shipper by entering into this Master Contract;

NOW, THEREFORE, in consideration of the mutual covenants and agreements

herein assumed, Transporter and Replacement Shipper agree as follows:

ARTICLE I - SCOPE OF CONTRACT

1. During the term of this Master Contract, on each Day on which

Replacement Shipper and Transporter schedule Gas for transportation hereunder,

Replacement Shipper shall cause the Scheduled Quantity up to the Maximum Daily

Quantity (MDQ) to be delivered to Transporter at the Receipt Point(s).

2. Replacement Shipper shall execute each Addendum in the form appended

hereto for each transaction under this Master Contract, which for purposes of

Section 7 of the General Terms and Conditions shall set forth the term of the

release transaction, the rate Replacement Shipper is obligated to pay, the

Receipt and Delivery Point(s) Replacement Shipper may use, the maximum

quantity of capacity Replacement Shipper has available for its use at such

point(s), and other relevant terms and conditions associated with Replacement

Shipper's acquisition of the released capacity. An officer of Shipper shall

notify Transporter in writing of the person(s) authorized on behalf of Shipper

to submit to Transporter such specific replacement shipper contracts.

The Addendum(s) shall be deemed to be an executed Capacity Release

Agreement, under this Master Contract, and shall be subject to the terms and

conditions hereof and of Transporter's Tariff, including the provisions of

Section 11 of the General Terms and Conditions. An officer of Shipper shall

notify Transporter in writing of the person(s) authorized on behalf of Shipper

to submit to Transporter specific transactions in the form of the Addendum

attached hereto.

3. On each Day during the Term of a transaction under this Master

Contract, Transporter shall make the Scheduled Quantity available to or on

behalf of Replacement Shipper at the Delivery Point(s) on a firm basis.

4. Replacement Shipper shall be solely responsible for securing faithful

performance by gas supplier(s) and/or any applicable upstream or downstream

shippers and transporters in all matters which may affect Transporter's

performance hereunder, and Transporter shall not be liable hereunder to

Replacement Shipper as a result of the failure of gas supplier(s) and/or any

applicable upstream or downstream shippers and transporters to so perform.