| ACES |
| AGL Resources |
| Alabama Gas Corporation |
| Alagasco |
| Allegro Development |
| Alliance Pipeline |
| American Electric Power |
| American Energy Solutions |
| American Petroleum Institute |
| America's Natural Gas Alliance (ANGA) |
| ANGD LLC |
| Apache Corp |
| Ardent Natural Gas, LLC |
| Argus |
| Atmos Energy Marketing |
| BENTEK Energy |
| BG Energy Merchants, LLC |
| Blackstone Technology Group |
| Bloomberg LP |
| BP Energy Company |
| Bridgeport Utilities |
| Brookfield Energy Marketing Inc. |
| Bunge North America |
| Burton Energy Group |
| Calpine Corporation |
| Capitol Energy Ventures |
| Cardinal Gas Storage Partners LLC |
| Cargill, Inc. |
| Cartersville Gas System |
| CenterPoint Energy Gas Transmission |
| CenterPoint Energy Resources Corp. |
| CenterPoint Energy Services |
| CF Industries Inc |
| Cheniere Energy |
| Chevron Natural Gas |
| City of Lakeland |
| City of Tallahassee |
| Clarke-Mobile Counties Gas District |
| Clayton Energy |
| CMC Gas |
| CME Group |
| CNX Gas Company LLC |
| Columbia Distribution Companies |
| Columbia Pipeline Group |
| ConocoPhillips Gas & Power |
| Consolidated Asset Management Services |
| Constellation Energy |
| Cullman-Jefferson Counties Gas District |
| DAK Americas LLC. |
|
| Dalton Utilities |
| Devon Energy Corporation |
| Direct Energy / Energy America |
| DSM Chemicals North America, Inc. |
| Duke Energy |
| Duke Energy Carolinas |
| Eastman Chemical Company |
| Ecova Inc. |
| EDF Trading North America, LLC |
| Elk River Public Utility District |
| Enbridge Marketing (U.S.) L.P. |
| Encana Marketing (USA) Inc. |
| Enercross |
| Energy Management & Services Co. |
| ENI USA Gas Marketing |
| Entegra Power Group |
| Enterprise Products Operating |
| EQT Energy |
| eServices, LLC |
| Etowah Utilities |
| Evonik Corporation |
| Exelon Generation Company LLC |
| ExxonMobil Gas & Power Marketing |
| Florida Gas Transmission Company |
| Florida Gas Utility |
| Florida Municipal Power Agency |
| Florida Power & Light |
| Fountain Inn Natural Gas System |
| Gas South |
| Georgia Institute of Technology |
| Georgia Tech |
| Georgia-Pacific LLC |
| Greenville Utilities |
| Greer CPW |
| Hawkins County Gas Utility |
| Hess Corporation |
| HMG |
| Holcim (US) inc / Aggregate Industries |
| Huntsville Utilities |
| Iberdrola Energy Services |
| ICE |
| Infinite Energy, Inc. |
| Interactive Data Corp./FutureSource |
| Interconn Resources, LLC |
| J.P. Morgan Chase & Company |
|
| Jefferies Bache, LLC |
| Kentucky Utilities |
| Kimberly-Clark Corporation |
| Knoxville Utilities Board |
| Leaf River Energy Center LLC |
| Liberty Utilities |
| Louisville Gas & Electric and Kentucky Utilities |
| LyondellBasell Industries |
| Macquarie Energy LLC |
| Marathon Petroleum Company LP |
| Marion Gas System |
| Merchant Energy Partners, LLC |
| Merrill Lynch Commodities |
| Middle Tennessee Natural Gas Utility District |
| MLGW |
| MMGS, Inc. (Mitsui) |
| Mobile Gas Service Corporation |
| Municipal Gas Authority of Georgia |
| Municipal Gas Authority of Mississippi |
| National Futures Association |
| NextEra Energy Resources, LLC |
| NJR Energy Services |
| Noble Energy, Inc. |
| Northwest Alabama Gas District |
| Oglethorpe Power Corporation |
| Okaloosa Gas District |
| Oldcastle, Inc. |
| ONEOK Energy Services |
| OpenLink |
| Orlando Utilities Commission |
| OTC Global Holdings |
| Owens-Illinois |
| PAA Natural Gas Storage |
| Panda Power Funds |
| Patriots Energy Group |
| PBG Energy Inc |
| Peoples Gas System |
| Piedmont Natural Gas |
| Planalytics |
| Platts |
| Platts/Bentek |
| Potash Corporation |
| POWER magazine |
| PowerSouth Energy Cooperative |
| PPL EnergyPlus LLC |
| Pratt Industries |
| Pricelock, Inc. |
| Public Energy Authority of Kentucky |
|
| QEP Resources |
| Quorum Business Solutions, Inc. |
| Rainbow Energy Marketing Corporation |
| Repsol Energy North America |
| RSCM Corp. |
| SCANA Energy Marketing |
| SCANA Services |
| Schneider Electric |
| Schwob Energy Services |
| Sempra US Gas and Power |
| Sequent Energy Management |
| Sevier County Utility District |
| Shell Energy North America |
| SNL Energy |
| SNL Financial |
| Sodexo |
| South Jersey Resources Group |
| South Mississippi Electric Power Assn. |
| Southcross Energy |
| Southeast Alabama Gas District |
| Southern Company |
| Southern Natural Gas / Kinder Morgan |
| Southern Natural Gas Company |
| Southern Power Company |
| SouthStar Energy Services |
| Southwestern Energy |
| Spectra Energy |
| Spectra Energy/ East Tennessee Natural Gas |
| Statoil Natural Gas LLC |
| SunGard Energy |
| Tampa Electric Company |
| Tenaska Marketing Ventures |
| Tennessee Gas Pipeline |
| Tennessee Valley Authority |
| Texla Energy |
| The Energy Authority |
| Transcontinental Gas Pipe Line Company, LLC |
| Unicoi County Gas Utility District |
| United Utilities Group / CH4 Concepts |
| Vega Energy Partners |
| W&T Offshore, Inc. |
| Washington Gas |
| Williams - Transco |
| Williams Gas Pipeline |
| Wood Mackenzie |
| Xstrata Nickel |
| York County Natural Gas Authority |
|
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