AGL Resources Inc.

Alabama Gas Corporation

Atmos Energy Corporation

Boardwalk Pipeline Partners

CenterPoint Energy

Dominion

Edgen Murray

McJunkin Red Man

NiSource Gas Transmission & Storage Co

ONEOK Inc.

Piedmont Natural Gas

SCANA Corporation

Southern Natural Gas, an El Paso Co.

Spectra Energy

The Laclede Group, Inc.

Washington Gas

Black & Veatch-Lukens Energy Group

CECO and CECO Pipeline Services

Cheniere Marketing Inc.

Chevron Natural Gas

ConocoPhillips

CPS Energy

Delta Natural Gas Company

 

 

E.ON/U.S.

EnergySouth, Inc.

Municipal Gas Authority of Georgia

Southern Star Central Gas Pipeline, Inc.

TECO Peoples Gas

Tenaska Marketing Ventures

Williams Gas Pipeline

Wood Mackenzie

Advance Engineering Corporation

Alliance Data

Arkansas Western Gas

Basic Systems, Inc.

Cal Dive International

Cameron Engineered Valve

Contract Land Staff, Inc.

Elster American Meter

Enogex Inc.

Equipment Controls Co.

Gulf Interstate Engineering

J And N Enterprises, Inc.

Merrill Lynch

Mueller Co. - Gas Products Division

Northern Environmental Technologies

Progressive Equipment, Inc.

R&M Energy Systems

Sensus Metering Systems

The Bayou Companies, LLC

Total Energy Corporation

Voith Turbo, Inc.

Vulcan Utility Signs & Products

Willbros Engineers, Inc.