Northern Natural Gas Company                                                   Original Sheet No. 165
FERC Gas Tariff
Fifth Revised Volume No. 1

                                            Rate Schedule CS-1
                                  Sublette, KS Firm Compression Service

1.   AVAILABILITY:

     This Rate Schedule CS-1 is available for the compression of natural gas at
     Northern's Sublette, KS compressor station under the following terms and conditions:

     a)  The Shipper has executed a Compression Services Agreement (CS-1 Agreement)
         in the form contained in Northern's FERC Gas Tariff;

     b)  Northern determines that sufficient capacity exists to provide the firm compression
         service.

2.  DEFINITIONS

     a) Exhibit A Volumes.  The gas volumes that Northern will deliver to Shipper on the Liberal
        Lateral that are specific contractual requirements as listed on Exhibit A ("Exhibit A
        Volumes").

     b) Additional Gas Volumes.  Gas that is delivered by Shipper subject to the availability of
        capacity to the Northern Sublette Compressors to be delivered to the Liberal Lateral that
        are in addition to the Exhibit A Volumes ("Additional Gas Volumes").

     c) Gross Liberal Lateral Volumes.  The Exhibit A Volumes and any Additional Gas Volumes plus
        fuel and unaccounted for associated with the Exhibit A Volumes and the Additional Gas
        Volumes are collectively the Gross Liberal Lateral Volumes or the "GLV."

     d) Net Liberal Lateral Volumes.  The "Net Liberal Lateral Volumes" or the "NLV" shall be
        determined as the measured volume at the Delivery Point as defined below.

     e) Total Station Fuel.  Northern will determine the Total Station Fuel ("TSF") as the sum of
        the volumes measured by the fuel meters for the Northern Sublette Compressors,
        dehydrator(s), and other volume consumed and measured at the Northern-owned facilities.

     f) Total Station Volume.  The Total Station Volume ("TSV") shall be the measured volume at
        the Receipt Point, as defined below.  This volume includes the Gross Liberal Lateral Volumes
        plus any other volumes that flow through the Sublette Compressor station to be transported on
        Northern's system.

     g) Receipt Point.  The meter located at the inlet to the Northern owned compressors (Units
        #26, #27, #13, #14) through which flows the Total Station Volume.

     h) Delivery Point.  The meter located at the outlet of the Sublette Compressor station that
        measures volumes that flow to Shipper on the Liberal Lateral consisting of the NLV.

     i) Other Shipper Volume.  The volumes that are confirmed to flow to the Receipt Point at
        Sublette by Shipper that will be transported by Northern and flow to Northern's pipeline
        system ("OSV").












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