Northern Natural Gas Company                                   Substitute Fifth Revised Sheet No. 227
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                    Substitute Fourth Revised Sheet No. 227

                                  GENERAL TERMS AND CONDITIONS

         To the extent construction of facilities is required to deliver gas at an hourly rate
         of 4.16%, Shipper shall be responsible for reimbursement of the associated costs.  Northern
         and Shipper may mutually agree upon the method of reimbursement. Further, electronic flow
         measurement and flow control equipment is required at any point where Northern and a Shipper
         have agreed to such hourly takes.  Northern will evaluate any such requests for negotiated
         hourly flow rates on a not unduly discriminatory basis.

     6.  Upon reasonable request of Shipper, Northern shall furnish information and copies of
         affidavits with respect to curtailments of Firm Service ordered under the provisions of this
         Section.

     7.  In the event end use curtailment is reimposed by an order of the Federal Energy
         Regulatory Commission or by court order, the provisions in this Section 19 pertaining to
         pro rata curtailment will be superseded and curtailment shall be effected on an end use
         basis.

     8.  For purposes of Section 19, Operating integrity will be determined using the following
         criteria: Weather forecast for the Market Area and for the Field Area; system conditions
         consisting of line pack, overall projected pressures at monitored locations, and storage
         field conditions; facility status defined as horsepower utilization and availability; and
         overall send-out projection and availability.

 B.  Supply

     1.  Receipt Point Supply Shortfall
         ------------------------------

         If Northern experiences underdeliveries of quantities of gas into Northern's system which
         render Northern unable to meet its total throughput obligations and affect the operating
         integrity of its system, Northern shall have the right, after providing as much advance
         notice as possible, to interrupt deliveries in the affected area until Northern is able
         to identify the Producer(s) or Shipper(s) who have failed to tender volumes equal to the
         volumes nominated and scheduled.  Curtailment will be effected in the following sequence
         after Northern has made a diligent effort to identify the deficient source:

        (a) If the deficient source(s) are known, Northern will curtail the corresponding
            market.

        (b) If the deficient source(s) are unknown, the smallest affected area at the receipt point
            will be localized and curtailed in the following sequence:

            (i) Interruptible throughput will be curtailed on the basis of the lowest TI price first;

           (ii) LFT service with Limited Days remaining for the month.
                a.  lowest price will be limited first;
                b.  greater number of remaining Limited Days second;
                c.  and then pro rata.

          (iii) Firm service, including LFT with no Limited Days remaining for the month, at primary
                or alternate points will then be curtailed pro rata.

                Corresponding markets will be curtailed in the same sequence described in
                paragraphs (b) (i)-(iii) above.

           Receipt point volumes which are independently verifiable by Northern will not be
           subject to the receipt point supply shortfall provisions.

           After receiving notification pursuant to this section, shippers who are able to confirm
           their deliveries to Northern will be permitted to resume their service in a reasonable
           period of time after such confirmation.  Confirmation shall mean that Northern is able,
           in good faith, to determine that the shipper's gas is being received, or shipper has
           provided to Northern an affidavit in a form acceptable to Northern confirming their
           deliveries.

           The foregoing provisions shall not relieve Northern from responsibility for acts of
           negligence or willful misconduct in implementing curtailment.
Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: August 22, 2008                                                   Effective: June 1, 2008
Filed to comply with order of the Federal Energy Regulatory Commission,
Docket No. RP08-262-001, issued July 29, 2008, 124 FERC 61,104