Northern Natural Gas Company                                           First Revised Sheet No. 66B.40
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                  Original Sheet No. 66B.40

100/For the period 04/01/2010 through 10/31/2010:

    Contract Total Quantity (CTQ) - 1,000,000 Dth

    Daily Minimum Injection - 0 Dth
    Daily Maximum Injection - 50,000 Dth

    Daily Minimum Withdrawal - 0 Dth
    Daily Maximum Withdrawal - 50,000 Dth

    Minimum Inventory - (125,000) Dth
    Maximum Inventory -  125,000 Dth

    Monthly Minimum Injection - 0 Dth
    Monthly Maximum Injection - 750,000 Dth

    Monthly Minimum Withdrawal - 0 Dth
    Monthly Maximum Withdrawal - 750,000 Dth

    The Total Transaction Rate charged shall be as follows:

    Injection Charge:                           $0.0149
    Withdrawal Charge:                          $0.0149
    Total Monthly Inventory Charges:            $0.0887
    Capacity Fee:                               $0.0500
    Annual Rollover Charge:                     $0.0000
    Total Transaction Rate:                     $0.1685

    Notwithstanding the above, Shipper will be charged the Capacity Fee (CAP)/Dth as reflected
    above at a point level on the absolute inventory balance(s) any time a positive or negative
    balance(s) is created in Shipper's account. In addition, Shipper will be charged the
    CAP/Dth as reflected above at a point level on the absolute beginning month inventory
    balance(s). The total cost commitment of this Agreement is equal to $0.00.

    The CTQ may be used at any storage point listed on Sheet No. 142C of Northern's FERC Gas
    Tariff.

























Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: August 31, 2010                                              Effective: September 1, 2010