Northern Natural Gas Company                                              Sixth Revised Sheet No. 116
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                Fifth Revised Sheet No. 116

                                           RATE SCHEDULE TFX
                                        Firm Throughput Service

               1.  AVAILABILITY.

                   This Rate Schedule is available for transportation of natural gas pursuant to a
                   Firm Throughput Service by Northern Natural Gas Company ("Northern") under the
                   following terms and conditions:

                   (a) Northern determines that sufficient capacity exists to provide the Firm
                       Throughput Service requested by Shipper;

                   (b) Shipper has executed a Firm Throughput Service Agreement ("TFX Agreement") of
                       the form contained in Northern's FERC Gas Tariff;

                   (c) the throughput service shall be subject to all of the terms and conditions
                       contained in this Rate Schedule and the GENERAL TERMS AND CONDITIONS of this
                       Tariff; and

                   (d) the transportation of natural gas within the MDQ under the throughput service
                       shall be on a firm basis.

                   (e) Shipper who has a TFX Agreement shall also be eligible to purchase from
                       Northern no-notice throughput service pursuant to Rate Schedule SMS-System
                       Management Service.

               2.  APPLICABILITY AND CHARACTER OF SERVICE.

                   Subject to the provisions of this Rate Schedule TFX and the GENERAL TERMS AND
                   CONDITIONS  of this Tariff, service within the MDQ rendered under a TFX Agreement
                   shall be on a firm basis of a transportation quantity referred to as the Maximum
                   Daily Quantity ("MDQ").  MDQ is the total volume of natural gas specified in the
                   TFX Agreement that Northern is obligated to transport on a daily basis from the
                   Point(s) of Receipt to the Point(s) of Delivery.

                   Shipper shall have the option to request firm throughput service (i) solely for
                   the Market Area, (ii) solely for the Field Area, or (iii) a combined service for
                   both the Market and the Field Area, or (iv) solely in the Gulf Coast Area.  The
                   Shipper's ability to utilize primary and alternate receipt and delivery points is
                   determined by which option is chosen by the Shipper. A Shipper with a combined
                   Market and Field Area service agreement may not transfer a primary firm receipt or
                   delivery point from the Field Area to the Market Area for the term of the TFX
                   agreement.

                   A Shipper is permitted to combine multiple TFX Agreements into a single TFX
                   Agreement to the extent that the individual Agreement's rates, terms and
                   conditions can be distinctly maintained within Northern's contracting and billing
                   systems.

                   Subject to the terms of this paragraph, a Shipper may select the full requirements
                   option.  Under such option, a Shipper will agree to take its full requirements
                   from Northern for the service territory currently served by the existing
                   entitlement and the growth associated with such service territory and agree not to
                   physically bypass Northern for such territories for the term of the agreement.  In
                   exchange for such agreement, Shipper and Northern may mutually agree to increase
                   the Shipper's contract demand at agreed upon intervals, to construct new
                   facilities if necessary and to exercise commercially reasonable best efforts to
                   secure approvals for such construction. To the extent new facilities would need to
                   be constructed to meet Shipper's growth requirements, Northern will hold open
                   seasons for any construction required and will provide service to any requesting
                   Shipper whose request meets the economic feasibility requirements for the
                   construction of facilities.
Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: July 16, 2010                                                  Effective: August 16, 2010