Northern Natural Gas Company

Fifth Revised Volume No. 1

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

Original Sheet No. 482 Original Sheet No. 482 : Effective

OPERATIONAL BALANCING AGREEMENT

Page 4 of 7

4. Capacity Constraints

In the event that a capacity constraint or a force majeure

event, as defined in Northern's tariff, occurs which results in

curtailment of quantities through the [Interconnection/Receipt

Point(s)], the party on whose system the constraint has occurred

shall determine any reallocation of quantities to its respective

shippers. Any changes in allocation shall be confirmed in

writing in the form set forth in Exhibit 2 or in any other form

agreeable to the parties. If the capacity constraint occurs at

the [Interconnection/Receipt Point(s)], the party which operates

the measurement facilities at such point(s) shall be deemed to

have the constraint on its pipeline system.

5. Measurement

All quantities of gas hereunder shall be reported in MMBtu,

which shall be determined by multiplying each Mcf of gas

received and delivered by the dry heating value thereof. Any

gas received and delivered to correct the Imbalance shall be

adjusted for variations in BTU content. Measurement of gas for

all purposes hereunder shall be in accordance with the

provisions set forth in the effective F.E.R.C. Gas Tariff of the

party operating the measurement facilities at the

[Interconnection/Receipt Point(s)].

6. Term

This Agreement shall be effective ___________, and shall

continue on a monthly basis until cancelled by either party