Northern Natural Gas Company

Fifth Revised Volume No. 1

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Effective Date: 02/25/2006, Docket: RP06-185-000, Status: Effective

First Revised Sheet No. 0 Northern Natural Gas Company: Fifth Revised Volume No. 1

First Revised Sheet No. 0 : Effective

Superseding: Original Sheet No. 0

F.E.R.C. GAS TARIFF

Fifth Revised Volume No. 1

(Supersedes Fourth Revised Volume No. 1)

OF

NORTHERN NATURAL GAS COMPANY

Omaha, Nebraska

Filed with the

FEDERAL ENERGY REGULATORY COMMISSION

Communications concerning this Tariff should be addressed to:

Mary Kay Miller

Vice President

Regulatory and Government Affairs

Northern Natural Gas Company

1111 South 103rd Street

Omaha, NE 68124-1000

Telephone No. (402) 398-7060

Fax No. (402) 398-7006