Northern Natural Gas Company                                            Fourth Revised Sheet No. 300A
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                               Third Revised Sheet No. 300A

                                    GENERAL TERMS AND CONDITIONS

              (c) Subject to the other provisions as described in Paragraph (e) below,
                  the actual throughput for each Fuel Section for each PRA Period is
                  determined as follows:

                  (i) The throughput for Fuel Section 1 is the sum of: (1) all
                      transportation volumes received at any receipt point in Fuel
                      Section 1 and delivered to any delivery point in Fuel Section 1
                      (Section 1 to Section 1); (2) all transportation volumes received
                      at any receipt point in Fuel Section 1 and delivered to any
                      delivery point in any other Fuel Section (Section 1 to Section 2
                      and Market MID); and (3) all transportation volumes received at
                      any receipt point in any other Fuel Section and delivered to any
                      delivery point in Fuel Section 1 (Section 2 and Market MID to
                      Section 1).

                 (ii) The throughput for Fuel Section 2 is the sum of: (1) all
                      transportation volumes received at any receipt point in Fuel
                      Section 2 and delivered to any delivery point in Fuel Section 2
                      (less volumes received in MID 16A at POI 1707 and delivered at MID
                      16B) (Section 2 to Section 2); (2) all transportation volumes
                      received at any receipt point in Fuel Section 2 (except receipts
                      set forth in Paragraph B of Sheet No. 54A) and delivered at any
                      delivery point in Fuel Section 1 (Section 2 less exceptions to
                      Section 1); (3) all transportation volumes received at any receipt
                      point in any other Fuel Section and delivered at any delivery
                      point in Fuel Section 2 (Section 1 or Market MID to Section 2)
                      (except receipts received at any receipt point in Fuel Section 1
                      and delivered to the points set forth in Paragraph C of Sheet
                      No. 54A); and (4) all transportation volumes received at any
                      receipt point in Fuel Sections 1 or 2 and delivered at any
                      delivery point in Fuel Section 3 (less volumes received at MID 16B
                      and delivered to MID 17) (Sections 1 or 2 to Market MID).

                (iii) The throughput for Fuel Section 3 is the sum of: (1) all
                      transportation volumes received at any receipt point in Fuel
                      Section 3 and delivered at any delivery point in Fuel Section 3
                      (Market MID to Market MID) and (2) all transportation volumes
                      received at receipt points in any other Fuel Section and delivered
                      at any delivery point in Fuel Section 3 (Sections 1 or 2 to Market
                      MID).

              (d) Subject to the Other Provisions as described in Paragraph (e) below,
                  the individual fuel retention percentages as determined above for each
                  Fuel Section shall be combined as follows to determine the fuel
                  retention percentages for each MID to MID transaction:

                  (i) The fuel retention percentage for each transaction from any
                      receipt point in any MID in Fuel Section 1 or 3 to any delivery
                      point in any MID in Fuel Sections 1 shall be the derived fuel
                      retention percentage for Fuel Section 1. (Section 1 or 3 to
                      Section 1).








Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: August 31, 2007                                                Effective: October 1, 2007