Portland Natural Gas Transmission System

Second Revised Volume No. 1

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

Original Sheet No. 550 Original Sheet No. 550 : Effective

ARTICLE XI - CHANGE IN TARIFF PROVISIONS

Shipper agrees that Transporter shall have the unilateral right to file

with the Federal Energy Regulatory Commission or any successor regulatory

authority any changes in any of the provisions of its Tariff, including of any

of its Rate Schedules, or the General Terms and Conditions, as Transporter may

deem necessary, and to make such changes effective at such times as

Transporter desires and is possible under applicable law.

IN WITNESS WHEREOF, the parties hereto have caused this Contract to be

duly executed in several counterparts by their proper officers thereunto duly

authorized, as of the date first hereinabove written.

ATTEST: PORTLAND NATURAL GAS TRANSMISSION SYSTEM

_____________________ By_______________________________________

ATTEST:

_____________________ By