Gas Transmission Northwest Corp.

Third Revised Volume No. 1-A

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Effective Date: 04/30/2010, Docket: RP10-550-000, Status: Effective

First Revised Sheet No. 0 Gas Transmission Northwest Corporation: Third Revised Volume No. 1-A

First Revised Sheet No. 0

Superseding: Original Sheet No. 0

FERC GAS TARIFF

THIRD REVISED VOLUME NO. 1-A

OF

GAS TRANSMISSION NORTHWEST CORPORATION

FILED WITH THE

FEDERAL ENERGY REGULATORY COMMISSION

Communications Concerning This Tariff

Should Be Addressed To:

Joan Collins

Manager, Tariffs and Compliance

Gas Transmission Northwest Corporation

Mailing Address: P.O. Box 2446

Houston, TX 77252-2446

Courier Address: 717 Texas Street, Suite 2400

Houston, TX 77002-2761

Phone: (832) 320-5651

Fax: (832) 320-6651