| Chevron Corporation |
13,424 |
| United States Department of Energy |
12,280 |
| BP British Petroleum |
3,566 |
| Science Applications International Corporation SAIC, Inc. |
3,221 |
| Exxon Mobil Corporation |
3,120 |
| Shell Oil Company |
3,073 |
| Bonneville Power Administration |
2,520 |
| CH2M HILL Companies, Ltd. |
2,462 |
| American Electric Power Company, Inc. |
2,347 |
| ConocoPhillips Company |
2,170 |
| Duke Energy Corporation |
2,084 |
| Cummins, Inc. |
1,974 |
| Eaton Corporation |
1,639 |
| City of Seattle, WA |
1,583 |
| Johnson Controls, Inc. |
1,562 |
| Southern Company |
1,517 |
| RBS Sempra Energy |
1,437 |
| Exelon Corporation |
1,432 |
| Entergy Corporation |
1,413 |
| Baker Hughes Incorporated |
1,401 |
| Halliburton Company |
1,393 |
| Edison International |
1,365 |
| Archer-Daniels-Midland Company |
1,322 |
| Waste Management, Inc. |
1,315 |
| Schlumberger Limited |
1,277 |
| United Technologies Corporation |
1,212 |
| Fluor Corporation |
1,173 |
| Anadarko Petroleum Corporation |
1,088 |
| Consolidated Edison Company of New York, Inc. |
1,080 |
| PG&E Corporation |
1,072 |
| El Paso Corporation |
1,046 |
| FirstEnergy Corp. |
1,031 |
| Florida Power & Light Company |
1,023 |
| Praxair, Inc. |
1,009 |
| Marathon Oil Corporation |
946 |
| Sun Express Logistics Pte Ltd |
934 |
| Schneider Electric |
920 |
| Energy Future Holdings |
919 |
| DTE Energy Company |
909 |
| Dominion Resources, Inc. |
895 |
| Valero Energy Corporation |
890 |
| National Grid USA |
859 |
| Constellation Energy Group, Inc. |
852 |
| PPL Corporation |
781 |
| Republic Services, Inc. |
764 |
| The Williams Companies, Inc. |
749 |
| Los Alamos National Laboratory (LANL) |
748 |
| EnCana Corporation |
735 |
| CenterPoint Energy, Inc. |
733 |
| Progress Energy Inc. |
725 |
| National Oilwell Varco |
705 |
| Devon Energy Corporation |
704 |
| Occidental Petroleum Corporation |
699 |
| Pacific Northwest National Laboratory (PNNL) |
696 |
| Energy Resources Conservation Board |
695 |
| Public Service Enterprise Group Incorporated |
685 |
| PacifiCorp |
681 |
| Ameren Corporation |
679 |
| Ontario Power Generation Inc. |
676 |
| Cameron International Corporation |
672 |
| Square-D |
629 |
| Xcel Energy Inc. |
620 |
| St. John's River Water Management District-SA |
613 |
| Alliant Energy Corporation |
598 |
| Westinghouse Electric Company |
597 |
| Allegheny Energy, Inc. |
589 |
| AES Corporation |
588 |
| Air Liquide Electronics |
586 |
| Kinder Morgan, Inc. |
585 |
| Weatherford International Ltd. |
579 |
| Hess Corporation |
560 |
| Apache Corporation |
534 |
| Sunoco, Inc. |
513 |
| Florida DOT |
510 |
| GE Energy |
509 |
| Arizona Public Service Company |
508 |
| Thomas & Betts Corporation |
497 |
| BOC Gases |
495 |
| Earth Tech, Inc. |
488 |
| NiSource Inc. |
486 |
| Enbridge Inc. |
478 |
| Trinity Industries, Inc. |
476 |
| IHS Inc. |
474 |
| Alberta Research Council |
465 |
| Tesoro Corporation |
460 |
| AmeriGas Partners, L.P. |
460 |
| ONEOK, Inc. |
459 |
| Reliant Energy |
453 |
| Smith International, Inc. |
452 |
| Wentworth Institute of Technology |
448 |
| SCANA Corporation |
445 |
| Atmos Energy Corporation |
443 |
| Chesapeake Energy Corporation |
443 |
| EDF Energy |
430 |
| Evonik Degussa Corporation |
422 |
| KBR, Inc. |
422 |
| Portland General Electric Company |
422 |
| Hydro-Quebec |
421 |
| American Water Company, Inc. |
402 |
| Centrica plc |
400 |
| MWH Global, Inc. |
400 |
| General Atomics |
400 |
| Northeast Utilities |
395 |
| SRP Salt River Project |
395 |
| Lower Colorado River Authority |
389 |
| CHS Inc. |
387 |
| The Lubrizol Corporation |
386 |
| BJ Services Company |
385 |
| CITGO Petroleum Corporation |
384 |
| BG Group plc |
381 |
| ICF International, Inc |
376 |
| OGE Energy Corp. |
375 |
| Nalco Company |
374 |
| Aker Solutions |
372 |
| Wood Group |
369 |
| Petro-Canada |
366 |
| Premier, Inc. |
366 |
| Chevron Phillips Chemical Company LP |
357 |
| Kiewit Pacific |
352 |
| Murphy Oil Corporation |
352 |
| CMS Energy Corporation |
352 |
| Nexen Inc. |
347 |
| NV Energy Inc |
346 |
| Los Angeles Department of Water and Power |
343 |
| TECO Energy, Inc. |
340 |
| Pepco Holdings, Inc. |
339 |
| Dynegy Inc. |
339 |
| Seminole Electric Cooperative, Inc. |
328 |
| Safety-Kleen, Inc. |
328 |
| EOG Resources, Inc. |
328 |
| Avista Corporation |
325 |
| Michael Baker Corporation |
312 |
| PNM Resources, Inc. |
306 |
| Wisconsin Energy Corporation |
306 |
| Caraustar Industries, Inc. |
303 |
| E.ON North America, Inc. |
303 |
| Southwest Power Pool |
302 |
| Puget Energy Inc |
302 |
| MidAmerican Energy Holdings Company |
296 |
| Pentair, Inc. |
291 |
| Platts |
290 |
| NRG Energy, Inc. |
288 |
| National Renewable Energy Laboratory |
287 |
| McJunkin RedMan Corporation |
286 |
| Pioneer Natural Resources Company |
284 |
| Southwest Gas Corporation |
283 |
| SCS Engineers |
282 |
| Marathon Petroleum Company |
280 |
| Husky Energy Inc. |
278 |
| British Columbia Transmission Corporation |
277 |
| Sacramento Municipal Utility District |
275 |
| Calpine Corporation |
275 |
| Nebraska Public Power District |
273 |
| Southern Union Company |
272 |
| Aera Energy LLC |
270 |
| AGL Resources, Inc. |
270 |
| CPS Energy |
268 |
| Spectra Energy Partners, L.P. |
268 |
| Transocean Inc. |
265 |
| Enterprise Products Partners L.P |
264 |
| UniSource Energy Corporation |
262 |
| Alstom Power |
259 |
| Baltimore Gas and Electric Company |
257 |
| Tenaska, Inc. |
257 |
| Newfield Exploration Company |
256 |
| Fortis Corporation |
255 |
| Idaho Power Company |
253 |
| Noble Energy, Inc. |
247 |
| Manitoba Hydro-Electric |
246 |
| Westar Energy, Inc. |
245 |
| Hydro Aluminum North America |
245 |
| Minnesota Power |
245 |
| Basin Electric Power Cooperative |
243 |
| Direct Energy Marketing Limited |
242 |
| Omaha Public Power District |
240 |
| Jindal Steels |
239 |
| E.ON UK plc |
238 |
| Southwestern Energy Company |
237 |
| Briggs and Morgan, P.A. |
234 |
| XTO Energy Inc. |
234 |
| TNP Enterprises, Inc. |
233 |
| Veolia Environmental Services |
233 |
| Marathon Ashland Petroleum LLC |
230 |
| Western Refining, Inc. |
229 |
| ACI Worldwide |
227 |
| Flint Hills Resources, LP |
225 |
| City of Anaheim |
225 |
| M-I SWACO |
223 |
| Great Plains Energy Incorporated |
220 |
| Hydro One Inc. |
219 |
| Areva NC Inc |
218 |
| Speedway SuperAmerica, LLC |
218 |
| SaskPower |
218 |
| CGGVeritas |
216 |
| Oceaneering International, Inc. |
216 |
| TransCanada PipeLines Limited |
216 |
| Atomic Energy of Canada Limited |
214 |
| Suncor Energy Inc. |
214 |
| Aleris International, Inc. |
212 |
| British Columbia Hydro and Power Authority |
210 |
