Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 08/01/2006, Docket: RP06-410-000, Status: Effective

Fifth Revised Sheet No. 140 Fifth Revised Sheet No. 140 : Effective

Superseding: Fourth Revised Sheet No. 140

RATE SCHEDULE FDD

Firm Deferred Delivery Service

6. 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 charge is set forth on Sheet No. 55

of this Tariff. The reservation charge is billed monthly for 12 months.

The monthly bill is equal to the reservation charge multiplied by the

Shipper's highest FDQ during the Withdrawal Period.

(b) Capacity Charge - The capacity charge is set forth on Sheet No. 55 of

this Tariff. The capacity charge is billed each month during the

Injection Period. The monthly bill is equal to the capacity charge

multiplied by the FSQ divided by 5. The capacity charge is billed each

month of the Injection Period.

55 of this Tariff. Such charge shall apply to all quantities received by

Northern for Shipper's FDD account during the Injection Period, and is

billed each month during the Injection Period. The injection charge in

the Withdrawal Period shall equal the authorized overrun charge.

(d) Withdrawal Charge - The withdrawal charge per Dth is set forth on Sheet

No. 55 of this Tariff. Such charge shall apply to all quantities

withdrawn from Shipper's FDD account during the Withdrawal Period, and is

billed each month during the Withdrawal Period. The withdrawal charge in

the Injection Period shall equal the authorized overrun charge.

(e) Fuel - The FDD storage fuel rate is set forth on Sheet No. 54 of this

Tariff. Such rate shall apply to all quantities received by Northern for

Shipper's FDD account during the Injection Period.

(f) Rollover Charge - The rollover charge per Dth is set forth on Sheet No.

55 of this Tariff. Such charge shall apply to the balance held in

Shipper's FDD account as of the end of the Withdrawal Period.

(g) Authorized Overrun Charge - The authorized overrun charge is equal to the

IDD Monthly Inventory Charge as set forth on Sheet No. 55 of this Tariff.

The authorized overrun charge shall be assessed to quantities scheduled

above the Shipper's FDQ and to quantities less than or greater than the

periodic account balance parameters in Shipper's Service Agreement, as

provided in Section 3. of this Rate Schedule.

(h) Flexibility - Unless otherwise mutually agreed to by Northern and Shipper,

all rates for service herein shall be flexible within the minimum and

maximum levels shown on Sheet No. 55 of this Tariff. The rate(s) Shipper

shall pay will be set forth in Shipper's Service Agreement, or otherwise

agreed to in writing. Northern shall have the right to charge the maximum

rate at any time as a condition of new service or continuation of service

beyond the termination date set forth in Shipper's Service Agreement.

Northern shall make all filings required by F.E.R.C. regulation with

respect to the rate(s).