Portland Natural Gas Transmission System

Second Revised Volume No. 1

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

Original Sheet No. 514 Original Sheet No. 514 : Effective

ARTICLE II - INTERRUPTIBLE TRANSPORTATION CAPACITY

1. Shipper hereby contracts for the right to cause Transporter to

receive from or for the account of Shipper at each Receipt Point such

quantities of Gas up to the MDQ for such Receipt Point as set forth on the

currently effective Schedule appended hereto, on any Day on which Transporter

has interruptible capacity available to Shipper, and Transporter shall make

available to or on behalf of Shipper on an interruptible basis at each

Delivery Point on such Day such quantities of Gas up to the MDQ for such

Delivery Point as set forth on the currently effective Schedule 2 appended

hereto. Schedules 1 and 2 are hereby incorporated as part of this Contract.

2. Transporter shall make available to Shipper the service contracted

for under this Article II on the Days and for the quantities of Gas for which

Transporter has interruptible capacity available to Shipper, subject to

Shipper's compliance with the terms and conditions of this Contract.

ARTICLE III - RATE

1. For each Month, Shipper agrees to pay the Recourse Rate, or a

negotiated rate mutually agreed to in writing by Shipper and Transporter,

multiplied by the sum of the Receipt Point Scheduled Quantity or Quantities

during such Month; provided, however, that in the event that Transporter

determines, in its sole discretion on a basis that is not unduly

discriminatory, or otherwise pursuant to this Contract to render service on

behalf of Shipper for a discounted usage rate, Transporter shall notify

Shipper in writing of the amount of such discounted usage rate, the Day(s) on

which such rate shall be in effect and the quantities to which such rate

applies. For each DTH of Scheduled Quantity to which a discounted usage rate

applies, as set forth in Transporter's notice, Shipper agrees to pay and shall

pay the applicable discounted usage rate in lieu of the maximum usage rate.

2. Shipper agrees to pay and shall pay all other applicable charges

specified in Rate Schedule IT.

ARTICLE IV - RATE SCHEDULES AND GENERAL TERMS AND CONDITIONS

This Contract and all provisions contained or incorporated herein are

subject to the provisions of Rate Schedule IT and of the General Terms and

Conditions as such may be revised or superseded from time to time, all of

which by this reference are made a part hereof. The General Terms and

Conditions and Rate Schedule IT shall control in the event of a conflict

between the General Terms and Conditions or Rate Schedule IT and this

Contract. All of the terms defined in Transporter's Tariff shall have the

same meaning wherever used in this Contract.