Northern Natural Gas Company                                              Sixth Revised Sheet No. 104
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                Fifth Revised Sheet No. 104

                                          RATE SCHEDULE TF
                                      Firm Throughput Services

        AND CONDITIONS of this Tariff, provided that sufficient capacity exists to transport such
        Overrun Volumes.

        Within total MDQ - While staying within its total aggregate MDQ in the Area contracted for,
        should Shipper, or its Designee, desire to nominate volumes for transportation  a) in excess
        of the MDQ specified at a point in the Firm Throughput Service Agreement (Primary Point) or
        b) at any other point on Northern's system through which Shipper is entitled to transport
        under Rate Schedule TF, (Alternate Point) such excess volume shall be considered firm
        volumes for billing purposes and shall be transported if capacity is available and shall be
        scheduled pursuant to Section 29 of the GENERAL TERMS AND CONDITIONS of this Tariff.

        In Excess of total MDQ - Should Shipper, or its Designee, desire to nominate volumes for
        transportation in excess of its total aggregate MDQ contracted for, such excess volumes will
        be interruptible volumes for nomination, scheduling and billing purposes and shall be
        scheduled for transportation if capacity is available pursuant to the terms and conditions
        of Rate Schedule TI and shall be scheduled pursuant to Section 29 of the GENERAL TERMS AND
        CONDITIONS of this Tariff.

        5.  TERM OF TF AGREEMENT.
            ---------------------

        The TF Agreement must be executed by Shipper prior to commencement of service.

        Northern and Shipper may agree to different termination dates for specified
        volumes within the same service agreement on a not unduly discriminatory basis.

        Northern and Shipper may agree, on a not unduly discriminatory basis, to contract
        extensions, including evergreens, rollovers and other extensions.


        A.  TF Agreements
            -------------

            1)  TF Agreements entered into pursuant to the New Services Settlement and prior to
                implementation of Order No. 636, shall retain any unilateral rollover right
                (grandfathered rollover right) contained therein.  However, should a Shipper request
                a rollover of an agreement which contains grandfathered rollover rights for less
                than the term of the original TF agreement, or a rollover at less than maximum
                rates, then the MDQ shall be subject to the Right of First Refusal process described
                in Section 52 of The GENERAL TERMS AND CONDITIONS of this Tariff.  If a Shipper
                under an agreement containing a grandfathered rollover right requests a rollover of
                less than the MDQ, then only that portion of the agreement for which a rollover was
                requested will remain subject to the grandfathered rollover right.  The remaining
                quantity shall not be subject to the Right of First Refusal process.  If a Shipper
                under an agreement containing a grandfathered rollover right provides notice of
                termination pursuant to the agreement, it must notify Northern at the same time of
                its desire to have the capacity posted for bids in the Right of First Refusal
                process.  If Shipper does not so notify Northern, the MDQ shall not be subject to
                the Right of First Refusal process.

            2) TF Agreements at maximum rates with a term of twelve (12) or more consecutive months
               of service or for a term of more than one (1) year for service not available for
               twelve consecutive months and TF Agreements at discounted rates entered into prior to
               March 27, 2000, with a term equal to or greater than one (1) year, shall have a
               guaranteed Right of First Refusal as provided in paragraph B.  herein and pursuant to
               Section 52 of the GENERAL TERMS AND CONDITIONS of this tariff.  Northern and Shipper
               may mutually agree to include ROFR rights in other TF Agreements on a not unduly
               discriminatory basis.

            3) TF Agreements with a term up to, but not including, twelve (12) consecutive months of
               service or for one (1) year or less, shall not be eligible for the Right of First
               Refusal process.  The service will be automatically abandoned upon expiration of the
               term.
Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: March 17, 2010                                                  Effective: April 17, 2010