Northern Natural Gas Company                                  Substitute Fourth Revised Sheet No. 155
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                Third Revised Sheet No. 155

                                        RATE SCHEDULE MPS
                                       MID Pooling Service

                   (l) There will be no transportation, fuel or UAF charges for nominations
                       between the Ventura deferred delivery point (POI 71460) and the
                       MID 17-192 pool (POI 78623).  There will be no transportation, fuel or
                       UAF charges for nominations from the MID 17-192 pool (POI 78623) to the
                       MID 17 pool (POI 71458).  There will be no transportation, fuel or UAF
                       charges for nominations from the Ventura pool (POI 78623) to the
                       NBPL/NNG Ventura receipt point (POI 192).  There will be no
                       transportation, fuel or UAF charges for nominations from Market Area
                       receipt points to the MID 17 deferred delivery point (POI 71459).
                       For purposes of this paragraph, the phrase "transportation, fuel or UAF
                       charges" does not include reservation charges.

                     *  Restricted to the receipt points of POI 1707 - "Bushton Plant Outlet"
                        and POI 71451 - "MID 16A Storage Pooling Point - 1707." For purposes
                        of allocating this receipt point, Northern will consider as primary
                        firm the quantity of gas nominated by Shipper up to the quantity of
                        unused MDQ contracted as primary firm at POI 1707.  All other
                        nominations on a firm agreement will be deemed alternate.

                    **  Restricted to the receipt point of POI 192 - "NBPL/NNG Ventura." For
                        purposes of allocating this receipt point, Northern will consider as
                        primary firm the quantity of gas nominated by Shipper up to the
                        quantity of unused MDQ contracted as primary firm at POI 192.  All
                        other nominations on a firm agreement will be deemed alternate.

                   ***  Pooling service is not available to move supplies from Market Area
                        receipt points to the MID 17 deferred delivery point (POI 71459).

               3.  OFFERING OF SERVICE:

                   To initiate service under this Rate Schedule MPS, a valid request must be
                   submitted in accordance with Section 26, "Requests for Service" and
                   Section 27, "Information Required for a Request for Service," of the
                   GENERAL TERMS AND CONDITIONS of this Tariff.

               4.  TERM OF MPS AGREEMENT:

                   The MPS Agreement must be executed by the Pooling Customer prior to
                   commencement of service.

                   The term of service shall be for a mutually agreeable term and shall be set
                   forth in the MPS Agreement.  If no service is rendered under a MPS Agreement
                   for a one (1) year period, such MPS Agreement shall be terminated by
                   Northern, unless otherwise mutually agreed.

               5.  RATES AND CHARGES:

                   No rate will be charged to a Pooling Customer for gas nominated from a
                   receipt point for delivery to the pooling point in the same MID under this
                   MID Pooling Service Rate Schedule; provided, however, if the gas is being
                   nominated from a Field Fuel receipt point, then the Pooling Customer shall
                   pay the applicable tariff fuel rate.  Fuel shall be retained on nominations
                   between a Field Fuel receipt point and the pooling point.

                   For purposes of rates, fuel and UAF charges, the location of MID 1-7 shall
                   be deemed to be in MID 4, the location of MID 8-12 shall be deemed to be in
                   MID 10 and the location of MID 13-16A shall be deemed to be in MID 13.

               6.  GENERAL TERMS AND CONDITIONS:

                   The GENERAL TERMS AND CONDITIONS of this Tariff, as may be revised from time
                   to time, are hereby incorporated into and made a part of this Rate Schedule.
Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: August 25, 2010                                                Effective: August 16, 2010