Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 10/25/2010, Docket: RP10-1337-000, Status: Effective

Seventh Revised Sheet No. 80B Seventh Revised Sheet No. 80B

Superseding: Sixth Revised Sheet No. 80B

NON-CONFORMING SERVICE AGREEMENTS

Agreement/

Rate Amendment Date

Name of Shipper/Agreement No. Schedule Date Filed

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

Southwestern Public Service Co. TFX 06/01/08 03/07/08

Contract 116267

Northern States Power Company-Wisconsin TF 11/01/09 06/09/09

Contract 23269/Amd 100

SEMCO Energy Gas Company TF 11/01/09 09/23/09

Contract 110025/Amd 28

Chevron U.S.A. Inc. PDD 10/01/10 03/31/10

Contract 110598/801937

Madison Gas and Electric Company TF 09/01/05 06/11/10

Contract 21340/Amd 32

Macquarie Energy LLC PDD 09/01/11 09/10/10

Contract 110593/802100

Macquarie Energy LLC PDD 10/01/11 09/10/10

Contract 110593/802101

Macquarie Energy LLC PDD 09/01/12 09/23/10

Contract 110593/802108

Macquarie Energy LLC PDD 10/01/12 09/23/10

Contract 110593/802109