Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 11/01/1998, Docket: RP98-203-004, Status: Effective

Sub Second Revised Sheet No. 107 Sub Second Revised Sheet No. 107 : Effective

Superseding: First Revised Sheet No. 107

RATE SCHEDULE TF

Firm Throughput Services

6. RATES AND CHARGES.

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The monthly billing for Firm Throughput Service(s) TF12 Base,

TF12 Variable, TF5 and TFF 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 TF agreements. The monthly bill

will be derived by using the applicable Throughput Reservation Rate

for the TF Throughput Service as shown on Sheet No. 50 of this

Tariff multiplied by the MDQs for each respective Throughput

Service(s) as shown on the TF 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 TF volumes during the respective month

multiplied by the Commodity Rate for each respective Throughput

Service(s) unit transported as shown on Sheet No. 50 of this

Tariff.