Northern Natural Gas Company                                             First Revised Sheet No. 291A
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                         Substitute Original Sheet No. 291A

                                      GENERAL TERMS AND CONDITIONS

                        Before issuing a Critical Day notice, an SOL Day will be posted.  Prior to
                        posting a Critical Day notice, subject to timing and availability, Northern
                        will use its operating tools to attempt to alleviate the operational concern.
                        Such tools include line pack, operational storage, Carlton Resolution, LNG,
                        and System Balancing Agreements (SBA).

                        1.  Notice.  Northern will post the Critical Day notice on its website no later
                            than two and one-half (2 1/2) hours prior to the NAESB Grid Cycle nomination
                            deadlines for the Critical Day Gas Day.  The Critical Day will remain in
                            affect for the remainder of the Gas Day.  Northern will post a new notice
                            for each subsequent Gas Day, as applicable.  The notice will contain the
                            following information:

                              (i)  The affected area;
                             (ii)  Offending Shipper(s), if known, subject to the Critical Day;
                            (iii)  The day and time that the Critical Day will become effective;
                             (iv)  The operational variables for the following: line pack and projected
                                   long/short gas;
                              (v)  Weather forecasts; and
                             (vi)  Demarc and MIP prices.

                        2.  Reporting. Northern will post on its Internet website within a reasonable
                            period of time following the conclusion of the Critical Day, a report
                            describing the conditions that required the issuance and the termination of
                            the Critical Day.

                        3.  Critical Day DDVCs. In the event Northern calls a Critical Day, the
                            determination of the volumes subject to Positive DDVC and Punitive DDVC are
                            as set forth above in this Section, and no tolerance will apply above the
                            Shipper's MDQ (including any overrun volumes scheduled) before DDVC's apply.
                            However, the rates such Positive volumes and Punitive volumes are charged
                            shall be the Positive/Critical Day DDVC rates and Punitive/Critical Day DDVC
                            rates, respectively.  The first two percent (2%) of Positive/Critical Day
                            DDVC volumes are charged $15/MMBtu and the next three percent (3%) are
                            charged $22/MMBtu.  The Punitive/Critical Day DDVC rates are also charged at
                            two (2) levels: Level I shall apply to the five percent (5%) of the daily
                            volumes at each delivery point that are in excess of the Positive/Critical
                            DDVC level, and Level II shall apply to any excess volumes above Level I.
                            However, Small Customer and Bypassing Small Customer tolerances and positive
                            DDVC levels as set forth in paragraph B.4 above apply at all times, even
                            when a Critical Day is called.  Small Customer and Bypassing Small Customer
                            Positive/Critical DDVC levels are $15/MMBtu for the greater of the first 2%,
                            or 260 MMBtu, and $22/MMBtu for the greater of the next 3%, or 390 MMBtu.
                            In addition, when an Critical Day is in effect, if the sum of the scheduled
                            volume on all of Shipper's firm and interruptible Throughput Service
                            Agreements is equal to or greater than the Shipper's MDQ, then the tolerance
                            is not available above the MDQ level.  However, in such case, SMS is
                            available up to the Shipper's MDQ.  Further, Small Customers and Bypassing
                            Small Customers retain their use of tolerance and positive DDVC levels as
                            set forth in paragraph B.4 above, and SMS on SOL or Critical Days, and Small
                            Customers are not subject to the foregoing limitation.  In the event
                            Northern posts a Critical Day notice to be effective during the IntraDay 1
                            or IntraDay 2 nomination cycle, Northern will only impose penalties
                            resulting from a Critical Day prospectively.  However, should a Critical Day
                            be called during an Intraday 2 nomination cycle, Northern will only apply
                            the Critical Day penalty charges to shippers who reduce their nominations in
                            the Intraday 2 cycle, but still take volumes in excess of the reduced
                            nomination.

Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: November 24, 2004                                              Effective: January 1, 2005