Northern Natural Gas Company                                              Tenth Revised Sheet No. 146
FERC Gas Tariff                                                                           Superseding
Fifth Revised Volume No. 1                                                Ninth Revised Sheet No. 146

                                       RATE SCHEDULE IDD
                            Interruptible Deferred Delivery Service

      precedence over Shipper's rights to service herein.

      Shippers shall nominate for injections and withdrawals pursuant to Section 6 below.  Northern
      shall schedule and allocate available IDD injection and withdrawal capacity based on price.

      a)  Northern may call an IDD inventory allocation when, in Northern's reasonable judgment, the
          aggregate level of increased IDD activity could jeopardize the ability of Northern to meet
          its firm storage requirements (an "IDD Inventory Allocation").  Northern may call a
          "Positive IDD Inventory Allocation" when its storage inventory is approaching levels that
          might jeopardize Northern's injection capacity for firm storage service.  Northern may
          call a "Negative IDD Inventory Allocation" when its storage inventory is approaching
          levels that might jeopardize Northern's ability to provide withdrawals for firm storage
          service.  During an IDD Inventory Allocation Period, as defined below, IDD shippers shall
          be entitled to nominate, and Northern shall undertake to schedule in accordance with the
          General Terms and Conditions of its Tariff, IDD service.  Individual Shipper's allowable
          IDD balance (AIB) at the end of the IDD Inventory Allocation Period shall be equal to its
          balance when the IDD Inventory Allocation Period commenced, or a percentage of such
          balance as determined in Northern's discretion. No less than thirty (30) days prior to the
          end of an IDD Inventory Allocation Period, Northern shall post to its website whether the
          AIB is the balance when the Inventory Allocation Process commenced or a percentage
          thereof.  During a Positive IDD Inventory Allocation, an IDD Shipper's balance at the end
          of the IDD Inventory Allocation Period may be less than its AIB.  In addition, during a
          Positive IDD Inventory Allocation, an IDD Shipper may nominate for injection to increase a
          negative account balance to zero.  During a Negative IDD Inventory Allocation, an IDD
          Shipper's balance at the end of the IDD Inventory Allocation Period may be greater than
          its AIB.  In addition, during a Negative IDD Inventory Allocation, the IDD Shipper may
          nominate for withdrawal to decrease a positive account balance to zero.

      b)  Northern will provide notice of an IDD Inventory Allocation at least twenty-four (24)
          hours prior to the timely nomination deadline for the Gas Day on which the IDD Inventory
          Allocation will commence, and such notice shall also state the Gas Day on which the IDD
          Inventory Allocation will end (such period between the commencement date and end date to
          be referred to as an "IDD Inventory Allocation Period").  Northern will post such notice
          on its website.  Northern may extend the IDD Inventory Allocation by posting a revised
          notice of the extension on its website.  Northern will also provide a grace period of one
          day for each day that an IDD Shipper's nomination in compliance with the IDD Inventory
          Allocation was unable to be scheduled by Northern during the last two weeks of such IDD
          Inventory Allocation Period.

      c)  In the event an IDD Shipper does not comply with an IDD Inventory Allocation in accordance
          with Section 4(a), above, at the end of the IDD Inventory Allocation Period, when Northern
          has declared a Positive IDD Inventory Allocation, any positive balance remaining in
          Shipper's IDD Account in excess of the AIB, after any grace period provided above, if
          applicable, shall become the property of Northern at no cost to Northern, free and clear
          of any adverse claims.  If Northern called a Negative IDD Inventory Allocation, then any
          negative balance remaining in Shipper's IDD Account less than the AIB, after the grace
          period provided above, if applicable, shall be invoiced to the Shipper at 150% of the
          Index Price as defined below in Section 5.c.

      In the event scheduled IDD volumes must be curtailed, such volumes shall be curtailed on the
      basis of price.

      For the purposes of allocating capacity, shippers willing to pay more than the maximum tariff
      rate will be considered to be paying the maximum tariff rate.


 

Issued by: Mary Kay Miller, V.P. Regulatory & Government Affairs
Issued on: June 8, 2007                                                      Effective: July 9, 2007