| Chevron Corporation |
13,594 |
| United States Department of Energy |
12,465 |
| BP British Petroleum |
3,597 |
| Exxon Mobil Corporation |
3,157 |
| Shell Oil Company |
3,027 |
| Science Applications International Corporation SAIC, Inc. |
2,930 |
| Bonneville Power Administration |
2,533 |
| CH2M HILL Companies, Ltd. |
2,339 |
| American Electric Power Company, Inc. |
2,179 |
| ConocoPhillips Company |
2,040 |
| Duke Energy Corporation |
1,972 |
| Cummins, Inc. |
1,866 |
| Eaton Corporation |
1,792 |
| City of Seattle, WA |
1,654 |
| United Technologies Corporation |
1,611 |
| Johnson Controls, Inc. |
1,599 |
| Halliburton Company |
1,508 |
| Baker Hughes Incorporated |
1,401 |
| Exelon Corporation |
1,398 |
| Edison International |
1,369 |
| Southern Company |
1,361 |
| Schlumberger Limited |
1,339 |
| Sempra Energy |
1,335 |
| Archer-Daniels-Midland Company |
1,242 |
| Waste Management, Inc. |
1,176 |
| Entergy Corporation |
1,117 |
| Anadarko Petroleum Corporation |
1,114 |
| Fluor Corporation |
1,102 |
| PG&E Corporation |
1,049 |
| Consolidated Edison Company of New York, Inc. |
1,022 |
| FirstEnergy Corp. |
990 |
| DTE Energy Company |
975 |
| Marathon Oil Corporation |
959 |
| Praxair, Inc. |
956 |
| El Paso Corporation |
940 |
| Florida Power & Light Company |
932 |
| Valero Energy Corporation |
909 |
| National Grid USA |
882 |
| Constellation Energy Group, Inc. |
878 |
| Schneider Electric |
866 |
| Energy Future Holdings |
858 |
| PPL Corporation |
787 |
| Los Alamos National Laboratory (LANL) |
776 |
| Republic Services, Inc. |
768 |
| Dominion Resources, Inc. |
765 |
| CenterPoint Energy, Inc. |
756 |
| National Oilwell Varco |
742 |
| Progress Energy Inc. |
741 |
| Occidental Petroleum Corporation |
735 |
| Ontario Power Generation Inc. |
727 |
| Energy Resources Conservation Board |
721 |
| The Williams Companies, Inc. |
720 |
| EnCana Corporation |
713 |
| Hess Corporation |
684 |
| Cameron International Corporation |
674 |
| PacifiCorp |
662 |
| Public Service Enterprise Group Incorporated |
659 |
| St. John's River Water Management District-SA |
651 |
| Pacific Northwest National Laboratory (PNNL) |
651 |
| Ameren Corporation |
635 |
| Devon Energy Corporation |
629 |
| AES Corporation |
603 |
| Xcel Energy Inc. |
590 |
| Kinder Morgan, Inc. |
582 |
| Allegheny Energy, Inc. |
577 |
| Weatherford International Ltd. |
567 |
| Square-D |
553 |
| Florida DOT |
546 |
| Apache Corporation |
542 |
| Alliant Energy Corporation |
540 |
| Air Liquide Electronics |
534 |
| GE Energy |
525 |
| BOC Gases |
508 |
| Sunoco, Inc. |
488 |
| Enbridge Inc. |
468 |
| Reliant Energy |
465 |
| Alberta Research Council |
463 |
| Arizona Public Service Company |
459 |
| Thomas & Betts Corporation |
456 |
| Wentworth Institute of Technology |
455 |
| NiSource Inc. |
449 |
| Chesapeake Energy Corporation |
447 |
| IHS Inc. |
442 |
| Trinity Industries, Inc. |
441 |
| Tesoro Corporation |
439 |
| Evonik Degussa Corporation |
438 |
| Atmos Energy Corporation |
433 |
| Earth Tech, Inc. |
429 |
| Petro-Canada |
422 |
| The Lubrizol Corporation |
421 |
| Europ Assistance Holdings Limited |
416 |
| Smith International, Inc. |
413 |
| SCANA Corporation |
413 |
| ONEOK, Inc. |
411 |
| Aker Solutions |
411 |
| AmeriGas Partners, L.P. |
410 |
| KBR, Inc. |
407 |
| CITGO Petroleum Corporation |
406 |
| Westinghouse Electric Company |
398 |
| BJ Services Company |
390 |
| BG Group plc |
388 |
| Portland General Electric Company |
387 |
| Centrica plc |
378 |
| Caraustar Industries, Inc. |
373 |
| General Atomics |
370 |
| MWH Global, Inc. |
365 |
| American Water Company, Inc. |
363 |
| Hydro-Quebec |
363 |
| Chevron Phillips Chemical Company LP |
357 |
| Northeast Utilities |
356 |
| OGE Energy Corp. |
356 |
| SRP Salt River Project |
355 |
| CHS Inc. |
354 |
| Nalco Company |
350 |
| ICF International, Inc |
350 |
| EOG Resources, Inc. |
347 |
| CMS Energy Corporation |
344 |
| Premier, Inc. |
341 |
| Wood Group |
339 |
| Kiewit Pacific |
332 |
| Lower Colorado River Authority |
331 |
| Pioneer Natural Resources Company |
329 |
| Dynegy Inc. |
327 |
| Murphy Oil Corporation |
327 |
| NV Energy Inc |
327 |
| Pepco Holdings, Inc. |
324 |
| Seminole Electric Cooperative, Inc. |
323 |
| Los Angeles Department of Water and Power |
315 |
| Wisconsin Energy Corporation |
314 |
| Southwest Power Pool |
305 |
| TECO Energy, Inc. |
304 |
| Michael Baker Corporation |
303 |
| E.ON North America, Inc. |
289 |
| British Columbia Transmission Corporation |
287 |
| ACI Worldwide |
286 |
| MidAmerican Energy Holdings Company |
285 |
| PNM Resources, Inc. |
284 |
| Westar Energy, Inc. |
280 |
| Marathon Petroleum Company |
278 |
| Transocean Inc. |
278 |
| SCS Engineers |
278 |
| Safety-Kleen, Inc. |
277 |
| Puget Energy Inc |
277 |
| AGL Resources, Inc. |
275 |
| Nebraska Public Power District |
275 |
| Husky Energy Inc. |
273 |
| National Renewable Energy Laboratory |
273 |
| NRG Energy, Inc. |
273 |
| Aera Energy LLC |
271 |
| Southwest Gas Corporation |
269 |
| Enterprise Products Partners L.P |
267 |
| Calpine Corporation |
267 |
| Avista Corporation |
266 |
| Pentair, Inc. |
266 |
| Spectra Energy Partners, L.P. |
261 |
| UniSource Energy Corporation |
260 |
| Tenaska, Inc. |
260 |
| The Lincoln Electric Company |
259 |
| CPS Energy |
253 |
| Noble Energy, Inc. |
251 |
| Briggs and Morgan, P.A. |
251 |
| E.ON UK plc |
251 |
| Sacramento Municipal Utility District |
249 |
| Newfield Exploration Company |
248 |
| Alstom Power |
248 |
| Southern Union Company |
247 |
| Western Refining, Inc. |
245 |
| Suncor Energy Inc. |
240 |
| XTO Energy Inc. |
240 |
| Jindal Steels |
240 |
| Fortis Corporation |
238 |
| Oceaneering International, Inc. |
237 |
| Idaho Power Company |
233 |
| Manitoba Hydro-Electric |
232 |
| Integrys Energy Group, Inc. |
229 |
| Southwestern Energy Company |
225 |
| Marathon Ashland Petroleum LLC |
225 |
| Hydro Aluminum North America |
222 |
| Omaha Public Power District |
222 |
| British Columbia Hydro and Power Authority |
218 |
| Flint Hills Resources, LP |
218 |
| M-I SWACO |
217 |
| SaskPower |
217 |
| Bruce Power LP |
216 |
| Direct Energy Marketing Limited |
216 |
| Questar Corporation |
215 |
| McJunkin RedMan Corporation |
214 |
| Atomic Energy of Canada Limited |
212 |
| Hydro One Inc. |
211 |
| Speedway SuperAmerica, LLC |
211 |
| Hawaiian Electric Industries, Inc. |
211 |
| Talisman Energy Inc. |
210 |
| Baltimore Gas and Electric Company |
209 |
| Scottish & Southern Energy P.L.C. |
209 |
| Enron Creditors Recovery Corporation |
208 |
| Veolia Environmental Services |
208 |
| Day & Zimmermann |
207 |
| City of Anaheim |
206 |
| Areva NC Inc |
205 |
| TNP Enterprises, Inc. |
205 |
