Northern Natural Gas Company                                   Substitute Third Revised Sheet No. 510
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                               Second Revised Sheet No. 510

                                   NORTHERN NATURAL GAS COMPANY
                                      SMALL CUSTOMER LISTING


          MARKET AREA SMALL CUSTOMERS  1/
          -----------------------------------
          Austin Utilities                            Osage Municipal Utilities
        * Brooklyn, City of                           Owatonna Public Utilities
        * Cascade Municipal Utilities               * Ponca, City of
          Cedar Falls Municipal Gas Utility           Preston Municipal Gas Department
        * Circle Pines Utilities                    * Remsen Municipal Utilities
            dba, Centennial Utilities               * Rock Rapids Municipal Utilities
          Coon Rapids Municipal Utilities           * Rolfe Municipal Gas
        * Community Utility Company                   Round Lake, City of
            (Crum, Lloyd V. Jr.)                    * Sabula, City of
        * Emmetsburg Municipal Gas Works            * Sac City, City of
          Fremont Department of Utilities           * Sanborn Municipal Gas Utility
        * Gilmore City, City of                     * Sheehan's Gas Company
            dba, Gilmore City Municipal Gas System    Sioux Center Municipal Natural Gas Utility
        * Graettinger Municipal Gas                   St. Croix Valley Natural Gas Company Inc.
        * Guthrie Center Municipal Utilities            dba, St. Croix Gas
          Harlan Municipal Utilities                  Superior Water Light & Power
        * Hawarden Municipal Utilities              * Tipton, City of
          Hibbing Public Utility Commission         * Two Harbors, City of
          Hutchinson Utilities Commission           * Virginia Public Utilities
        * Lake Park Municipal Utilities               Watertown Municipal Utilities
        * Lyons, NE, City of                        * Waukee, City of
        * Manilla Municipal Gas Department          * West Bend, City of
          Manning Municipal Gas Department            Westbrook Light and Power
        * Midwest Natural Gas, Inc.                   Western Gas Utilities Inc.
          Muny Natural Gas (Viroqua)                  Whittemore, City of
        * National Public Gas Agency                * Woodbine Municipal Natural Gas System
            (Nebraska Public Gas Agency)
          New Ulm Public Utilities Commission
          Northwest Natural Gas Company
            dba, Gorham's Inc.


          FIELD AREA SMALL CUSTOMERS  1/
          ----------------------------------
          City of Iraan                               Southern Union Gas Company
          West Texas Gas Company                      PNM Gas Services (Gas Co. of New Mexico)


          * - Denotes customers eligible for GS-T transportation service.

          1/  Pursuant to Stipulation and Agreement of Settlement filed May 7, 1993, in
              Docket Nos. RS92-8, RS92-1, et al., as modified in Docket No. RP98-203.












Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: April 30, 2010                                                  Effective: April 17, 2010
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket No. RP10-502-000, issued April 16, 2010, 31 FERC 61,041