Northern Natural Gas Company

Fifth Revised Volume No. 1

Effective Date: 05/01/2009, Docket: RP96-272-091, Status: Effective

Original Sheet No. 66B.22 Original Sheet No. 66B.22

77/ The rates charged Shipper shall be as follows: (i) For the first 5,000 Dth/day, Shipper

shall pay a monthly reservation rate equal to Northern's maximum summer rate; plus (ii) for

entitlement over 5,000 Dth/day up to 10,000 Dth/day, Shipper shall pay a reservation rate

equal to Northern's maximum summer rate multiplied by the volumes actually delivered to the

Primary Delivery Point of OPPD/CASS County Power Plant (POI 78180) each month.

The commodity rate shall equal the maximum rate provided in Northern's FERC Gas Tariff as

revised from time to time.

For all volumes above 10,000 Dth/day, Shipper shall pay the applicable maximum overrun

rate.

In addition to the above rate(s), Shipper shall provide any applicable fuel use and

unaccounted for.

The rates stated herein are applicable to the receipt and (or) delivery points (POI) listed

below. Shipper agrees that if any other receipt or delivery points are used either on a

primary or alternate basis, the rates set forth herein will not be applicable and

Northern's maximum rates will apply for the entire contract MDQ during the month that any

points not listed below are used.

Primary Receipt Point: NBPL/NNG Ventura Primary Delivery Point: OPPD/Cass County Power

Plant

Alternate Receipt Points: All Market Area Receipt Points Primary Delivery Points:

Demarc Def. Delivery, MID 17 Pooling Point, Ventura Def. Delivery, OPPD Fuel Meter

In addition to the above rate(s), Shipper shall pay (a) the FERC approved Carlton

surcharge, if applicable, and (b) all FERC approved surcharges that are made effective

after the effective date of this Amendment and applicable to the service provided

hereunder.

The term of the Agreement is for five (5) summer months (May through September) through

09/30/2010. At any time during the current term of the Agreement but no fewer than 8 months

prior to the expiration of the Agreement, Shipper may elect to rollover the Agreement at

the rate and terms set forth herein for one additional May through September with the

Agreement terminating on 09/30/2011.