Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 11/01/1993, Docket: RS92- 8-004, Status: Effective

Original Sheet No. 481 Original Sheet No. 481 : Effective

OPERATIONAL BALANCING AGREEMENT

Page 3 of 7

Each party will allocate the quantities which are to be

delivered and received at the [Interconnection/Receipt Point(s)]

among each party's respective shippers pursuant to the confirmed

nominations. Any differences between the actual physical flow

and the sum of the confirmed nominations is the "Imbalance", and

will be the responsibility of the parties to eliminate on a

continuous basis.

3. Adjustment to Operational Imbalance

On a daily basis, measured quantities shall be

estimated for use in determining the estimated Imbalance at

the [Interconnection/Receipt Point(s)]. The parties shall

agree on the daily level of adjustment to physical flow of

gas during each delivery month required to reasonably

control the estimated Imbalance.

The physical flow at the [Interconnection/Receipt

Point(s)] for each month will be determined and communicated

by the party which operates the measurement facilities to

the other party in writing as soon as possible, but in no

case later than the tenth (10th) workday of the month

following the month of delivery. Any Imbalance shall be

corrected in a manner agreed to within thirty (30) days of

the date the Imbalance is confirmed in writing by the

parties or within such longer period of time agreed upon by

the parties.