Portland Natural Gas Transmission System

Second Revised Volume No. 1

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Effective Date: 09/01/2006, Docket: RP06-449-000, Status: Effective

Original Sheet No. 0 Portland Natural Gas Transmission System: Second Revised Volume No. 1

Original Sheet No. 0 : Effective

FERC GAS TARIFF

Second Revised Volume No. 1

(Supersedes Original Volume No. 1)

PORTLAND NATURAL GAS TRANSMISSION SYSTEM

Filed With The

FEDERAL ENERGY REGULATORY COMMISSION

Communications Concerning This Tariff

Should Be Addressed To:

Portland Natural Gas Transmission System, L.P.

One Harbour Place

Portsmouth, New Hampshire 03801