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. 206 Original Sheet No. 206 : Effective

RATE SCHEDULE IT

INTERRUPTIBLE TRANSPORTATION SERVICE

1. AVAILABILITY

This Rate Schedule IT is available for service by Transporter to any

Shipper, where:

(a) Shipper has made a valid request, as defined in Section 3 of

the General Terms and Conditions;

(b) Shipper has met Transporter's financial creditworthiness

criteria as set forth in Section 3 of the General Terms and Conditions;

(c) Shipper and Transporter have entered into a Gas

Transportation Contract for Interruptible Transportation Service under this

Rate Schedule;

(d) Transporter has capacity available to render the service

pursuant to the General Terms and Conditions;

(e) all necessary contracts have been or will be entered into by

or on behalf of Shipper for the acquisition of Gas, for the delivery of such

Gas to Transporter at one or more Receipt Points on the System, and/or the

further transportation of Gas from one or more Delivery Points on the System,

as applicable; and

(f) all necessary regulatory and governmental approvals to

purchase and sell, transport and, if appropriate, export and/or import the Gas

to be transported by Transporter have been obtained.

2. APPLICABILITY AND CHARACTER OF SERVICE

This Rate Schedule shall apply to all interruptible service pursuant to a

bilaterally executed Gas Transportation Contract for service under this Rate

Schedule, whether rendered by forwardhaul or by displacement, exchange or

backhaul. Service rendered under this Rate Schedule is subject to curtailment

or interruption as Transporter deems necessary.