| Chevron Corporation |
13,634 |
| United States Department of Energy |
12,330 |
| BP British Petroleum |
3,585 |
| Exxon Mobil Corporation |
3,194 |
| Shell Oil Company |
3,011 |
| Science Applications International Corporation SAIC, Inc. |
2,945 |
| Bonneville Power Administration |
2,536 |
| CH2M HILL Companies, Ltd. |
2,343 |
| American Electric Power Company, Inc. |
2,202 |
| ConocoPhillips Company |
2,052 |
| Duke Energy Corporation |
2,011 |
| Cummins, Inc. |
1,902 |
| Eaton Corporation |
1,705 |
| United Technologies Corporation |
1,624 |
| City of Seattle, WA |
1,596 |
| Johnson Controls, Inc. |
1,568 |
| Halliburton Company |
1,482 |
| Baker Hughes Incorporated |
1,400 |
| Exelon Corporation |
1,392 |
| Edison International |
1,365 |
| Sempra Energy |
1,359 |
| Southern Company |
1,352 |
| Schlumberger Limited |
1,329 |
| Archer-Daniels-Midland Company |
1,269 |
| Anadarko Petroleum Corporation |
1,131 |
| Waste Management, Inc. |
1,127 |
| Fluor Corporation |
1,125 |
| Entergy Corporation |
1,113 |
| PG&E Corporation |
1,058 |
| Consolidated Edison Company of New York, Inc. |
1,038 |
| Florida Power & Light Company |
973 |
| Marathon Oil Corporation |
969 |
| Praxair, Inc. |
955 |
| FirstEnergy Corp. |
947 |
| El Paso Corporation |
932 |
| DTE Energy Company |
932 |
| Valero Energy Corporation |
902 |
| National Grid USA |
885 |
| Schneider Electric |
875 |
| Constellation Energy Group, Inc. |
871 |
| Energy Future Holdings |
865 |
| Dominion Resources, Inc. |
808 |
| PPL Corporation |
802 |
| CenterPoint Energy, Inc. |
768 |
| Republic Services, Inc. |
756 |
| Progress Energy Inc. |
753 |
| National Oilwell Varco |
744 |
| Los Alamos National Laboratory (LANL) |
737 |
| Occidental Petroleum Corporation |
736 |
| Ontario Power Generation Inc. |
728 |
| The Williams Companies, Inc. |
723 |
| Energy Resources Conservation Board |
721 |
| EnCana Corporation |
718 |
| Cameron International Corporation |
691 |
| Public Service Enterprise Group Incorporated |
671 |
| Hess Corporation |
671 |
| PacifiCorp |
666 |
| Pacific Northwest National Laboratory (PNNL) |
656 |
| Devon Energy Corporation |
642 |
| Ameren Corporation |
640 |
| AES Corporation |
620 |
| St. John's River Water Management District-SA |
619 |
| Allegheny Energy, Inc. |
584 |
| Kinder Morgan, Inc. |
584 |
| Xcel Energy Inc. |
581 |
| Weatherford International Ltd. |
577 |
| Apache Corporation |
561 |
| Square-D |
558 |
| Florida DOT |
551 |
| Alliant Energy Corporation |
550 |
| Air Liquide Electronics |
547 |
| GE Energy |
524 |
| BOC Gases |
505 |
| Sunoco, Inc. |
499 |
| Reliant Energy |
478 |
| Enbridge Inc. |
473 |
| Chesapeake Energy Corporation |
464 |
| Alberta Research Council |
463 |
| Thomas & Betts Corporation |
462 |
| Arizona Public Service Company |
459 |
| NiSource Inc. |
458 |
| IHS Inc. |
453 |
| Trinity Industries, Inc. |
448 |
| Wentworth Institute of Technology |
442 |
| Tesoro Corporation |
439 |
| Atmos Energy Corporation |
434 |
| Earth Tech, Inc. |
432 |
| Smith International, Inc. |
429 |
| Petro-Canada |
423 |
| Evonik Degussa Corporation |
423 |
| ONEOK, Inc. |
416 |
| AmeriGas Partners, L.P. |
416 |
| Aker Solutions |
411 |
| SCANA Corporation |
410 |
| Europ Assistance Holdings Limited |
410 |
| The Lubrizol Corporation |
407 |
| BJ Services Company |
407 |
| KBR, Inc. |
407 |
| Westinghouse Electric Company |
399 |
| CITGO Petroleum Corporation |
395 |
| Portland General Electric Company |
390 |
| BG Group plc |
379 |
| Centrica plc |
379 |
| Sun Express Logistics Pte Ltd |
375 |
| General Atomics |
372 |
| Hydro-Quebec |
363 |
| American Water Company, Inc. |
361 |
| Northeast Utilities |
361 |
| OGE Energy Corp. |
360 |
| ICF International, Inc |
359 |
| Chevron Phillips Chemical Company LP |
358 |
| SRP Salt River Project |
357 |
| MWH Global, Inc. |
356 |
| Nalco Company |
349 |
| Wood Group |
348 |
| EOG Resources, Inc. |
343 |
| Murphy Oil Corporation |
341 |
| CHS Inc. |
340 |
| Premier, Inc. |
340 |
| Pepco Holdings, Inc. |
336 |
| Kiewit Pacific |
334 |
| Lower Colorado River Authority |
333 |
| Pioneer Natural Resources Company |
332 |
| NV Energy Inc |
332 |
| CMS Energy Corporation |
331 |
| Dynegy Inc. |
327 |
| Caraustar Industries, Inc. |
326 |
| Seminole Electric Cooperative, Inc. |
323 |
| Los Angeles Department of Water and Power |
318 |
| Wisconsin Energy Corporation |
317 |
| Southwest Power Pool |
305 |
| Michael Baker Corporation |
304 |
| TECO Energy, Inc. |
302 |
| ACI Worldwide |
293 |
| PNM Resources, Inc. |
291 |
| E.ON North America, Inc. |
288 |
| British Columbia Transmission Corporation |
287 |
| Safety-Kleen, Inc. |
287 |
| MidAmerican Energy Holdings Company |
284 |
| AGL Resources, Inc. |
282 |
| Marathon Petroleum Company |
279 |
| Puget Energy Inc |
279 |
| SCS Engineers |
279 |
| NRG Energy, Inc. |
277 |
| Pentair, Inc. |
274 |
| Husky Energy Inc. |
273 |
| National Renewable Energy Laboratory |
273 |
| Nebraska Public Power District |
273 |
| Southwest Gas Corporation |
272 |
| Calpine Corporation |
272 |
| Aera Energy LLC |
271 |
| Westar Energy, Inc. |
269 |
| Avista Corporation |
268 |
| Enterprise Products Partners L.P |
268 |
| Transocean Inc. |
267 |
| Southern Union Company |
263 |
| The Lincoln Electric Company |
262 |
| UniSource Energy Corporation |
261 |
| Spectra Energy Partners, L.P. |
261 |
| CPS Energy |
257 |
| Tenaska, Inc. |
257 |
| Sacramento Municipal Utility District |
251 |
| McJunkin RedMan Corporation |
251 |
| Newfield Exploration Company |
250 |
| XTO Energy Inc. |
247 |
| Alstom Power |
245 |
| Briggs and Morgan, P.A. |
244 |
| Fortis Corporation |
244 |
| Noble Energy, Inc. |
242 |
| Western Refining, Inc. |
241 |
| Jindal Steels |
239 |
| Suncor Energy Inc. |
237 |
| Oceaneering International, Inc. |
236 |
| Manitoba Hydro-Electric |
234 |
| E.ON UK plc |
230 |
| Idaho Power Company |
229 |
| Southwestern Energy Company |
227 |
| Marathon Ashland Petroleum LLC |
226 |
| Questar Corporation |
225 |
| Hydro Aluminum North America |
224 |
| Baltimore Gas and Electric Company |
223 |
| M-I SWACO |
222 |
| Flint Hills Resources, LP |
220 |
| British Columbia Hydro and Power Authority |
219 |
| CGGVeritas |
218 |
| Direct Energy Marketing Limited |
218 |
| Omaha Public Power District |
218 |
| SaskPower |
217 |
| Bruce Power LP |
216 |
| Speedway SuperAmerica, LLC |
214 |
| Atomic Energy of Canada Limited |
213 |
| Enron Creditors Recovery Corporation |
212 |
| Veolia Environmental Services |
212 |
| Hydro One Inc. |
211 |
| Talisman Energy Inc. |
211 |
| TNP Enterprises, Inc. |
208 |
| City of Anaheim |
206 |
| Areva NC Inc |
205 |
| Minnesota Power |
205 |
| Great Plains Energy Incorporated |
203 |
