Alabama Electric Coop. Alcoa, Inc. Allegheny Energy Supply Alliant Energy Amereda Hess Corp. American Electric Power Associated Electric Coop, Inc. BP Burlington Electric Calpine Chevron Texaco City Utilities of Springfield Conoco-Phillips Constellation Power Source Generation Crockett Co-Generation CV Pundi Mas Sejahtera Dairyland Power Co. Diamond Offshore Dow Chemical Co El Paso Electric Co. Electro Hydraulic Systems Enterprise Products Exxon Mobil FirstEnergy Nuclear Operating Co Flint Hills Resources GIS United Kingdom Limited Greenes Energy Gregory Power Partners, LP Gulf South Pipeline H & H Hydraulics, Inc. Innovene USA, LLC Kinder Morgan Liberty Gas Storage Lower Colorado River Authority Madison Gas And Electric |
Marathon Petroleum Company LLC MidAmerican Energy Co. Minnkota Power Cooperative, Inc. Mirant Monsanto National Gypsum Co. Nebraska Public Power District Nicor Gas NRG OG&E Power Supply Olin Co. Ondeo Ind. Solutions Pubilc Company of New Mexico (PNM) Public Service Enterprise Group (PSEG) Public Service of Colorado Purdue University PureEnergy Operating Services, LLC Rayonier, Inc. Reliant Energy Rock-Tenn co. Sincor Solvay Paperboard Southwest Electric Power Co. Suez Energy Sunoco Logistic Syngenta Corp Targa Resources, Inc. Teppco Texas Petrochemicals, LP The New Zealand Refining Co. Tri-State G & T Assoc. Trunkline Gas UBM Engineering Services Wheelabrator Wolf Creek Nuclear Operating Co |