A.T. Kearney, Inc.
Advanced Resources International
AGL Resources Inc.
Alliance to Save Energy
American Council for an Energy-Efficient Economy
American Electric Power
American Gas Association
American Petroleum Institute
Argonne National Laboratory
Arkansas Public Service Commission
Atmos Energy Corporation
Avista Corporation
Black & Veatch Corporation
Blackwell Sanders Peper Martin LLP
Cascade Associates
Center for LNG
Centerpoint Energy
Centra Gas of Manitoba
Cheniere LNG
Citizens Gas & Coke Utility
City Public Service of San Antonio
Clearfield Ohio Holdings
Columbia Gas
Connecticut Natural Gas Corporation
Consolidated Edison Company of New York, Inc.
Council of Industrial Boiler Owners
CTN, The Energy Network
Deloitte & Touche LLP USA
Delta Natural Gas Company
Direct Energy Business Services
District of Columbia Public Service Commission
DTE Corporation
Duke Energy
Dynegy, Inc.
Energen Corp.
Energy & Environmental Analysis
Energy Daily
ENSR International
Estrella Energy
Excelerate Energy
First Dallas Securities
Ernst & Young LLP
Exelon Corp.
FERC
Gas Appliance Manufacturers Association
GTI - Gas Technology Institute
HESS LNG
Hoffman-Paulson Associates
Hunt Oil
ILNGA International LNG Alliance
Illinois Commerce Commission
Indiana Office of Utility Consumer Counselor
Indiana Utility Regulatory Commission
Interstate Oil and Gas Compact
Intrinergy
Interstate Petroleum Association of America
Kentucky Public Service Commission
KeySpan Corp.
KNG Energy
Magnum Hunter Resources, Inc.
Maguire Energy Institute
McKinsey & Company, Inc.
Missouri Public Service Commission
NARUC
National Environmental Trust
National Petroleum Council
Natural Gas Supply Association
National Regulatory Research Institute
Natural Resources Defense Council
Navigant Consulting
Nevada Public Utilities Commission
New Jersey Resources
NiSource Inc.
North Carolina Utilities Commission
Northwest Gas Association
NW Natural
Office of the Ohio Consumers Counsel
Ohio Gas Association
Ohio Public Utilities Commission
Ohio Valley Gas, Inc.
Oildom Publishing Company
ONEOK Inc.
Oklahoma Corporation Commission
Orwell Natural Gas
Pacific Gas and Electric Company
Peoples Energy Corporation
Pepco Holdings, Inc.
Philadelphia Gas Works
Piedmont Natural Gas Company, Inc.
Pioneer Natural Resources
Pipeline & Gas Journal
Platts Gas Daily
Platts, Division of the McGraw-Hill Companies
Public Utility Commission of Texas
Questar Corporation
RCP inc.
Reaction Sciences, Inc.
Reuters
RJ Rudden Associates
Rohm and Haas Company
Sanders Morris Harris
SEMCO Energy Gas Company
Simmons & Company International
Solar Energy Industries Association
Solar Turbines Incorporated
Southwest Gas Corporation
Standard & Poor's
Star Natural Gas
Stone Energy Corporation
Terra Industries Inc.
The Dow Chemical Company
The Laclede Group, Inc.
The NARUC Foundation
The North American Coal Corporation
The Reinforced Aggregates Company
TXU Corp.
UBS Investment Research
Union of Concerned Scientists
U.S. Department of Energy
U.S. Department of the Interior
U.S. Department of Transportation
U.S. Environmental Protection Agency
Vectren Corporation
Washington Gas Light Company White House Council on Environmental Quality
Xcel Energy Inc.