Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 04/17/2010, Docket: RP10-502-000, Status: Effective

Eighth Revised Sheet No. 135A Eighth Revised Sheet No. 135A

Superseding: Seventh Revised Sheet No. 135A

RATE SCHEDULE FDD

Firm Deferred Delivery Service

(Dth)

I. Gas-In-Place Option

Account Balance Parameters:

* Each Shipper's minimum and maximum quantities are determined based on each Shipper's respective FSQ

as a percent of the total FDD annual cycle quantity offered.

Injection Period Withdrawal Period

----------------- -----------------

Total of all Shippers' Account Balances may not Total of all Shippers' Account Balances may not be

be greater than 39,434,500 on August 31.* less than 8,539,200 on January 31.*

Total of all Shippers' Account Balances may not be

greater than 31,784,800 on March 1.*

Daily Maximum FDQ:

-----------------

Daily Maximum Daily Maximum Daily Maximum Daily Maximum

Injection Injection Withdrawal Withdrawal Withdrawal Injection

Period FDQ FDQ Period FDQ FDQ

-------- -------------- ------------- ----------- ------------- --------------

40% or less 404,319* 261,810* 75.0% or more 1,028,529* 238,247*

of FSQ +900 per of FSQ

100,000 of GIP

in excess of 0

40.0% or more 617,117* 327,263* less than 75% 865,383* 238,247*

but less than +150 per but more than +550 per

80% of FSQ 100,000 of GIP 25% of FSQ 100,000 of

in excess of GIP in excess

23,691,626* of 14,825,000*

80.0% or more 652,584* 392,715* 25% or less 319,199* 238,247*

of FSQ of FSQ +3,670 per

100,000 of GIP

in excess of 0

April 319,199* 119,124*

May Overrun Overrun

(Interruptible) (Interruptible)