Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 07/09/2007, Docket: RP07-483-000, Status: Effective

Sixth Revised Sheet No. 147 Sixth Revised Sheet No. 147 : Effective

Superseding: Fifth Revised Sheet No. 147

RATE SCHEDULE IDD

Interruptible Deferred Delivery Service

(a) Injection Charge - The Injection Charge per MMBtu set forth on Sheet No. 55

shall apply to all quantities received for Shipper's account.

(b) Withdrawal Charge - The Withdrawal Charge per MMBtu set forth on Sheet No.

55 shall apply to all quantities delivered to Shipper.

forth on Sheet No. 55 and shall apply to the absolute value of the inventory

balances in Shipper's IDD Account for the month.

(d) Annual Rollover Charge - The annual rollover charge per MMBtu is set forth

on Sheet No. 55 of this Tariff. Such charge shall apply to the balance held

in Shipper's IDD account as of March 31st.

(e) 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. Northern shall have the right

to charge the maximum rate at any time as a condition of new 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).

(f) Fees - Shipper, or its Designee, shall reimburse Northern upon billing for

fees paid by Northern to governmental or regulatory bodies for any filings

required in conjunction with service provided to Shipper.

Transportation Service Associated with Deferred Delivery Service

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IDD quantities must be delivered to or redelivered from a Deferred Delivery Point

pursuant to a Throughput Service Agreement. Deliveries and redeliveries of the IDD

quantities shall be subject to the rates, terms and conditions of the upstream or

downstream Firm or Interruptible Throughput Service Agreement including transportation

entitlements and capacity allocations.

A transportation rate and fuel is charged both into and out of a Field Area storage

point. Except as provided below with regard to a transportation point and its

associated storage point, a transportation rate and fuel is charged for delivery to the

Ogden storage point. If redelivery from Ogden is to a Market Area point, there is no

additional transportation or fuel charge. If the redelivery is to a Field Area point,

the Field Area mileage/MID transportation rate and fuel is charged. To the extent a

volume is transported between a pooling point and its associated storage point, no

transportation fee or fuel shall be assessed. With the exception of Ogden, to the

extent a volume is transported from a storage point to a transportation point other

than its own associated transportation point then a transportation fee and fuel will be

assessed.

When the Ogden Deferred Delivery Point is used, the Shipper must use the same type of

service (i.e., firm or interruptible) to transport to and from the deferred delivery

point, unless agreed to otherwise by Northern on a non-discriminatory basis. However,

in the event Shipper has used interruptible service into the IDD account, Shipper may

utilize released capacity, under the terms and conditions of Section 47, Capacity

Release, to transport quantities from the IDD account.

8. GENERAL TERMS AND CONDITIONS:

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The GENERAL TERMS AND CONDITIONS of this Tariff are hereby incorporated herein

by reference and made a part of this Rate Schedule.