Northern Natural Gas Company

Fifth Revised Volume No. 1

Effective Date: 06/01/1999, Docket: RP98-203-006, Status: Effective

Fourth Revised Sheet No. 124 Fourth Revised Sheet No. 124 : Effective

Superseding: Third Revised Sheet No. 124

RATE SCHEDULE TFX

Firm Throughput Service

(1) provide the appropriate Fuel; or

(2) purchase the appropriate Fuel from Northern at a mutually

agreed upon price.

The scheduling priority for Fuel shall be the same priority as the

respective volumes scheduled to flow. The overall Fuel and

unaccounted for percentages are set forth on Sheet No. 54, and

detailed by receipt-to-delivery MID path on Sheet Nos. 61-64 of this

Tariff.

A Shipper's fuel and unaccounted for is determined by multiplying the

volumes at the receipt point by the applicable receipt-to-delivery

MID path rate as shown on Sheet Nos. 61-64. If the Shipper's receipt

point is a mainline fuel point, the applicable fuel rate is the

"ML Fuel" rate from the MIDs matrix. If the Shipper's receipt point

is a field fuel point, the applicable fuel rate is the "TOTAL" rate

from the MIDs matrix.

Electric Compression

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In addition, Shipper shall pay the applicable Market Area and Field

Area electric compression commodity rate, as shown on Sheet No. 54 of

this Tariff, pursuant to Section 53B of the General Terms and

Conditions of this Tariff.

(f) Daily Delivery Variance Charges (DDVC)

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Shipper shall pay the applicable Daily Delivery Variances

Charges pursuant to Section 48 of the GENERAL TERMS AND

CONDITIONS of this Tariff.