Northern Border Pipeline Company

First Revised Volume No. 1

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Effective Date: 01/01/2007, Docket: RP06- 72-003, Status: Effective

First Revised Sheet No. 180A First Revised Sheet No. 180A : Effective

Superseding: Original Sheet No. 180A

RATE SCHEDULE T-1B

FIRM BACKHAUL SERVICE

3. RATES (Continued)

3.1 Rates (Continued)

Compressor Usage Surcharge - The Compressor Usage

Surcharge is defined and computed in accordance with

Section 45 of the General Terms and Conditions of

Company's FERC Gas Tariff and only shall be applicable

if secondary points are utilized which reverse the

directional flow of Shipper's contractual firm back-

haul service to a forward-haul service.

3.2 Discounted Rates

Company shall charge the applicable Maximum Reservation

Rate and applicable Maximum Commodity Rate set forth on the

Statement of Rates applicable to service hereunder unless

Company, from time to time and at any time at its

discretion on a non-discriminatory basis, charges any

individual Shipper for transportation service under this

Rate Schedule a rate which is lower than the Maximum Rate

hereunder; provided, however, that the total amount charged

may not be less than the applicable Maximum Commodity

Rate(s) set forth on the currently effective Statement of

Rates of Company's FERC Gas Tariff, plus the effective

Annual Charge Adjustment and the Compressor Usage

Surcharge.

In the event secondary points are utilized which impact the

directional flow of a discounted transaction, such discount

shall not be applicable to such secondary points and

utilization of such secondary points shall be billed the

applicable Maximum Commodity Rate under Rate Schedule IT-1

set forth on the currently effective Statement of Rates.