Northern Natural Gas Company                                                  Original Sheet No. 259B
FERC Gas Tariff
Fifth Revised Volume No. 1

                                     GENERAL TERMS AND CONDITIONS

    Pooling
    -------
    Pooling is:  1) the aggregation of gas from multiple physical and/or logical points to a single
    physical or logical point and/or 2) the dis-aggregation of gas from a single physical or logical
    point to multiple physical and/or logical points.  Pooling points have been established in
    Northern's Field and Market Areas to provide Shippers and Pooling Customers the means to
    aggregate supplies using a Pooling and/or Throughput Service Agreement for deliveries at a
    pooling point, in accordance with Rate Schedule MPS or the applicable Throughput Rate Schedule.

    Northern and Shipper shall establish a procedure to electronically exchange information
    regarding receipt and delivery quantities in dekatherms to achieve a daily operational gas
    balance, and Shipper shall, upon request, furnish such data as Northern deems necessary to
    maintain control of its system, including, without limitation, established Btu content of the
    gas to be received by Northern.  If Northern determines in its reasonable discretion that
    confirmation of nominations at certain Point(s) of Receipt and/or Delivery are necessary to
    maintain the integrity of its system, Northern will not schedule transportation unless the party
    causing the gas to be delivered for Shipper's account into Northern's system at the Point(s) of
    Receipt confirms such deliveries and that the party receiving gas from Northern's system for
    Shipper's account at the Point(s) of Delivery confirms that it will receive such volumes.






 
































Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: August 25, 2006                                                Effective: October 1, 2006