Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 10/01/2007, Docket: RP07-648-000, Status: Effective

Third Revised Sheet No. 120 Third Revised Sheet No. 120 : Effective

Superseding: Second Revised Sheet No. 120

RATE SCHEDULE TFX

Firm Throughput Service

5. OVERRUN

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Overrun Volumes. Northern agrees to transport volumes in excess of the

MDQ contracted for ("Overrun Volumes") on an interruptible basis for Shipper in

accordance with the terms and conditions of this Rate Schedule and the "GENERAL

TERMS AND CONDITIONS" of this Tariff, provided that sufficient capacity exists to

transport such Overrun Volumes.

Within total MDQ - While staying within its MDQ in the Area contracted for,

should Shipper, or its Designee, desire to nominate volumes for transportation

a) in excess of the MDQ specified at a point in the Firm Throughput Service

Agreement (Primary Point) or b) at any other point on Northern's system,

(Alternate Point) such excess volume shall be considered firm volumes for billing

purposes and shall be transported if capacity is available and shall be scheduled

pursuant to Section 29 of the General Terms and Conditions of this Tariff.

In Excess of total MDQ - Should Shipper, or its Designee, desire to nominate

volumes for transportation in excess of its MDQ contracted for, such excess

volumes will be interruptible volumes for nomination, scheduling and billing

purposes and shall be scheduled for transportation if capacity is available

pursuant to the terms and conditions of Rate Schedule TI and shall be scheduled

pursuant to Section 29 of the General Terms and Conditions of this Tariff.