Northern Natural Gas Company

Fifth Revised Volume No. 1

Effective Date: 11/01/2003, Docket: RP03-398-011, Status: Effective

Second Revised Sheet No. 149 Second Revised Sheet No. 149 : Effective

Superseding: First Revised Sheet No. 149

RATE SCHEDULE SMS

SYSTEM MANAGEMENT SERVICE

4. RATES AND CHARGES

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The rates and charges for service under this Rate Schedule shall include each

of the following:

(a) Reservation Charge - The reservation rate is set forth on Sheet No. 55.

The monthly charge is equal to the reservation rate multiplied by the SMS

entitlement in effect for the respective month.

(b) Commodity Charge - The commodity rate is set forth on Sheet No. 55. The

monthly charge is equal to the commodity rate multiplied by the sum of

the daily volume variances. Daily volume variance is any difference between (i) the

absolute value of the difference between the volume amount scheduled at the delivery

point, and the volume amount actually taken at the delivery point for the day up to

the amount of SMS contract quantity, and (ii) the applicable tolerance levels set

forth in Section 48.

5. SMS AGREEMENTS

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The Shipper must execute an SMS Service Agreement which will be linked to a

specific companion Firm Throughput Service Agreement. The SMS Service Agreement term must

match the companion Firm Throughput Service Agreement term unless such agreement exceeds

five (5) years.

6. GENERAL TERMS AND CONDITIONS

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The GENERAL TERMS AND CONDITIONS of this Tariff are hereby incorporated

herein by reference and made a part of this Rate Schedule.