All companies featured: Calpine Corporation (NYSE:CPN), ENGIE (EPA:ENGI), American Municipal Power, Incorporated, Walsh Construction Company (Chicago, Illinois)

All companies featured: Ernest & Young, E.ON AG (OTC: EONGY), Siemens AG (FWB:SIE), KPMG, TransCanada Corporation (TSX:TRP) (NYSE:TRP)

All companies featured: Owens Corning (NYSE: OC), PMX Cogeneracion, Enel Green Power Mexico, Abengoa Mexico, PEMEX, SunPower Corporation (NASDAQ:SPWR), Edison International (NYSE:EIX), Vattenfall AB, E.ON AG (OTC:EONGY)

All companies featured: Plains All American Pipeline, L.P. (NYSE:PAA), Valero Energy Corporation (NYSE:VLO), IKEA, Apex Clean Energy, Goodyear Tire & Rubber Company (NASDAG:GT), DONG Energy A/S

All companies featured: Clean Energy Fuels Corporation (NASDAQ:CLNE), Baker Hughes Incorporated (NYSE:BHI), Boardwalk Pipeline Partners (NYSE:BWP), General Electric (NYSE:GE), Consolidated Edison Incorporated (NYSE:ED)

All companies featured: Williams Partners LP (NYSE: WPZ), Fluor Corporation (NYSE:FLR), Honeywell International (NYSE:HON), Samsung Renewable Energy Incorporated, DONG Energy A/S, Siemens AG (FWB:SIE), Balfour Beatty plc (LSE:BBY),Pattern Energy Group LP

All companies featured: Blue Ridge Biofuels LLC and Tyton NC Biofuels LLC, Metso (OMX:MEO1V), Hitachi Limited (OTC:HTHIF), Électricité de France S.A. (EPA:EDF), Antofagasta plc, MEG Energy Corporation (TSX:MEG)

All companies featured: Jacobs Engineering Group Incorporated (NYSE:JEC), Novartis AG (NYSE:NVS), Siemens AG (FWB: SIE), Gamesa Corporation S.A. (MCE:GAM)

All companies featured: Dow Chemical Company (NYSE:DOW), E.I. du Pont de Nemours and Company (NYSE:DD), Exxon Mobil Corporation (NYSE:XOM)