Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 03/01/2009, Docket: RP96-272-088, Status: Effective

First Revised Sheet No. 80A First Revised Sheet No. 80A

Superseding: Original Sheet No. 80A

NON-CONFORMING SERVICE AGREEMENTS

Agreement/

Rate Amendment Date

Name of Shipper/Agreement No. Schedule Date Filed

----------------------------- -------- --------- --------

Northern States Power Company - Minnesota Agreements:

Contract 112184 TFX

As Amended 11/01/07 04/07/06

Contract 112186 TFX

As Amended 11/01/07 04/07/06

Contract 112182 TF

As Amended 11/01/07 04/07/06

Contract 112185 TFX

As Amended 11/01/07 10/16/06

Contract 112183 TF

As Amended 11/01/07 04/07/06

Northern States Power - Generation:

Contract 112203 TFX

As Amended 11/01/07 04/07/06

Flint Hills Resources, LP TFX 06/01/06 05/01/06

Contract 111404

Tenaska Gas Storage, LLC:

Contract 110597 PDD

As Amended 12/01/08 05/08/06

Minnesota Energy Resources Corporation TFX 11/01/08 10/01/08

Contract 112561

As Amended