Northern Natural Gas Company

Fifth Revised Volume No. 1

Effective Date: 11/22/2003, Docket: RP03-398-000, Status: Effective

Second Revised Sheet No. 121 Second Revised Sheet No. 121 : Effective

Superseding: Substitute First Revised Sheet No. 121

RATE SCHEDULE TFX

Firm Throughput Service

6. RATES AND CHARGES.

The monthly billing for TFX Throughput Service shall be the sum of:

(a) Throughput Reservation Charges

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Shipper shall be billed monthly for reservation charges

associated with its Field, Market or combined TFX agreements.

The monthly bill will be derived by using the highest TF

Reservation Rate in effect for the month for the TFX

Throughput Service as shown on Sheet No. 51 of this Tariff,

multiplied by the MDQ as shown on the TFX Agreement. In

addition, Shipper shall be billed monthly for reservation

charges associated with any receipt capacity MDQ reserved in

excess of delivery capacity MDQ in the Market Area and in the

Field Area at a rate equal to one-half of the TF12 Base

monthly reservation charge per MMBtu as shown on Sheet No. 50.

(b) Throughput Commodity Charge

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The total units of TFX volumes during the respective month

multiplied by the Commodity Rate for each TFX unit transported

as shown on Sheet No. 51 of this Tariff.

The Throughput Commodity rate for TFX service shall be the

commodity rate in effect for the respective month of the TFX

agreement. Such rates are set forth on Sheet No. 51.

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If Shipper designates a gathering receipt point as a primary

receipt point(s) identified on Appendix A to the TFX

Throughput Service Agreement then, in addition to the MOPS TFX

reservation and commodity charges shown on Sheet No. 51,

Shipper shall pay the monthly MOPS Gathering reservation and

commodity charges shown on Sheet No. 51. The amount billed

for reservation shall be the product of the applicable MOPS

Gathering reservation rate per Dth multiplied by Shipper's MDQ

at such primary receipt point(s) and for commodity shall be

the product of the MOPS Gathering commodity rate multiplied by

the throughput from the gathering receipt point for the

billing month.