Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 04/17/2010, Docket: RP10-501-000, Status: Effective

Seventh Revised Sheet No. 139 Seventh Revised Sheet No. 139

Superseding: Sixth Revised Sheet No. 139

RATE SCHEDULE FDD

Firm Deferred Delivery Service

Authorized Reductions

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In the event that Northern has allocated storage injections during the Withdrawal

Period, FDD Shippers shall be allowed to reduce scheduled firm withdrawal quantities

during the last nomination cycle of the Gas Day by an amount up to a quantity equal

to the aggregate Daily Maximum Injection FDQ during the Withdrawal Period as shown

on Sheet No. 135B. In the event that the difference between the total firm

withdrawal quantity nominated during the last nomination cycle compared to the total

firm withdrawal quantity scheduled as the FDD Shipper's daily firm withdrawal rights

during the previous cycle is greater than the quantity equal to the aggregate Daily

Maximum Injection FDQ, Northern shall allocate the firm reductions pro-rata.

In the event that Northern has allocated storage withdrawals during the Injection

Period, FDD Shippers shall be allowed to reduce scheduled firm injection quantities

during the last nomination cycle of the Gas Day by an amount up to a quantity equal

to the aggregate Daily Maximum Withdrawal FDQ during the Injection Period as shown

on Sheet No. 135B. In the event that the difference between the total firm

injection quantity nominated during the last nomination cycle compared to the total

firm injection quantity scheduled as the FDD Shipper's daily firm injection rights

during the previous cycle is greater than the quantity equal to the aggregate Daily

Maximum Withdrawal FDQ, Northern shall allocate the firm reductions pro-rata.

4. INTERRUPTION OF SERVICE

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Firm service under this Rate Schedule shall have the highest scheduling priority of

Northern's storage services. In addition, service under this Rate Schedule shall be

subject to interruption under the terms of the upstream or downstream Firm or

Interruptible Throughput Service Agreement(s). Any limitations imposed by such

Throughput Service Agreements shall have precedence over Shipper's rights to service

herein.

In the event that Northern is required to allocate capacity on its system, service

under this Rate Schedule may be constrained by the allocation of capacity to the

applicable Transportation Service Agreement.

5. OFFERING OF SERVICE

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Available FDD capacity will be posted on Northern's Internet website. Northern shall

accept requests for service under this Rate Schedule for FDD quantities available. Such

requests must contain information required to initiate service as defined in Section 27,

"Information Required for a Request for Service," of the "GENERAL TERMS AND CONDITIONS" of

this Tariff. Priority for service shall be based on the price and term offered by the

Shipper. For the purposes of allocating capacity, Shippers willing to pay more than the

maximum tariff rate will be considered to be paying the maximum tariff rate. Northern,

upon receiving such requests including all information required to initiate service, shall

notify Shipper of the quantity of FDD capacity available and any inability to provide the

service requested. Any allocations required as a result of receiving matching offers will

be on a pro rata basis.