Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 02/13/2003, Docket: RP03-235-000, Status: Effective

Fourth Revised Sheet No. 105 Fourth Revised Sheet No. 105 : Effective

Superseding: Third Revised Sheet No. 105

RATE SCHEDULE TF

Firm Throughput Services

B. Northern and Shipper may agree to reduction rights. If Northern and

Shipper are unable to agree, Shipper shall be entitled to the following:

In the event a "firm customer of Shipper" served by use of Shipper's firm

throughput entitlement on Northern arranges either directly or indirectly

through an upstream supplier for incremental firm service with Northern

for the remaining term of the Shipper's Service Agreement in lieu of

taking assignment from Shipper for such firm service, Northern agrees to

reduce Shipper's firm entitlement by an amount determined by Shipper that

is no greater than the level of contract demand of incremental firm

service arranged for with Northern by the "firm customer of Shipper"

(i.e., Northern is kept revenue neutral except to the extent Northern

discounts to the customer), provided however, Shipper must first submit

an affidavit to Northern verifying that such customer was being served by

use of Shipper's firm throughput entitlement on Northern. Reductions by

Shipper will not be allowed if the "firm customer of Shipper" arranges

either directly or indirectly through an upstream supplier for a non-

incremental service (i.e., capacity release) on Northern or for

interruptible service (i.e., TI) on Northern.