| Chevron Corporation |
13,576 |
| United States Department of Energy |
12,518 |
| BP |
3,560 |
| Exxon Mobil Corporation |
3,119 |
| Shell Oil Company |
3,039 |
| Science Applications International Corporation SAIC, Inc. |
2,895 |
| Bonneville Power Administration |
2,532 |
| CH2M HILL Companies, Ltd. |
2,325 |
| American Electric Power Company, Inc. |
2,169 |
| ConocoPhillips Company |
2,023 |
| Duke Energy Corporation |
1,957 |
| Cummins, Inc. |
1,854 |
| Eaton Corporation |
1,798 |
| City of Seattle, WA |
1,719 |
| United Technologies Corporation |
1,613 |
| Johnson Controls, Inc. |
1,607 |
| Halliburton Company |
1,512 |
| Exelon Corporation |
1,405 |
| Southern Company |
1,382 |
| Edison International |
1,372 |
| Baker Hughes Incorporated |
1,357 |
| Schlumberger Limited |
1,329 |
| Sempra Energy |
1,301 |
| Waste Management, Inc. |
1,215 |
| Archer-Daniels-Midland Company |
1,214 |
| Anadarko Petroleum Corporation |
1,116 |
| Entergy Corporation |
1,113 |
| Fluor Corporation |
1,088 |
| PG&E Corporation |
1,036 |
| FirstEnergy Corp. |
1,010 |
| DTE Energy Company |
1,001 |
| Consolidated Edison Company of New York, Inc. |
995 |
| Praxair, Inc. |
953 |
| El Paso Corporation |
949 |
| Marathon Oil Corporation |
940 |
| Florida Power & Light Company |
917 |
| Valero Energy Corporation |
904 |
| National Grid USA |
883 |
| Constellation Energy Group, Inc. |
881 |
| Schneider Electric |
862 |
| Energy Future Holdings |
854 |
| Los Alamos National Laboratory (LANL) |
806 |
| PPL Corporation |
775 |
| Republic Services, Inc. |
771 |
| Dominion Resources, Inc. |
762 |
| National Oilwell Varco |
758 |
| CenterPoint Energy, Inc. |
756 |
| Progress Energy Inc. |
737 |
| Occidental Petroleum Corporation |
728 |
| Ontario Power Generation Inc. |
724 |
| The Williams Companies, Inc. |
721 |
| Energy Resources Conservation Board |
721 |
| EnCana Corporation |
711 |
| Hess Corporation |
697 |
| St. John's River Water Management District-SA |
666 |
| PacifiCorp |
664 |
| Public Service Enterprise Group Incorporated |
663 |
| Cameron International Corporation |
661 |
| Pacific Northwest National Laboratory (PNNL) |
651 |
| Ameren Corporation |
632 |
| Devon Energy Corporation |
632 |
| AES Corporation |
600 |
| Xcel Energy Inc. |
592 |
| Kinder Morgan, Inc. |
580 |
| Allegheny Energy, Inc. |
571 |
| Square-D |
553 |
| Weatherford International Ltd. |
553 |
| Alliant Energy Corporation |
543 |
| Florida DOT |
539 |
| Apache Corporation |
537 |
| GE Energy |
532 |
| Air Liquide Electronics |
520 |
| BOC Gases |
511 |
| Sunoco, Inc. |
480 |
| Arizona Public Service Company |
468 |
| Enbridge Inc. |
464 |
| Wentworth Institute of Technology |
462 |
| Alberta Research Council |
461 |
| Thomas & Betts Corporation |
454 |
| Chesapeake Energy Corporation |
451 |
| Evonik Degussa Corporation |
444 |
| NiSource Inc. |
444 |
| IHS Inc. |
443 |
| Trinity Industries, Inc. |
440 |
| Tesoro Corporation |
434 |
| Atmos Energy Corporation |
432 |
| Earth Tech, Inc. |
429 |
| The Lubrizol Corporation |
422 |
| Petro-Canada |
420 |
| Europ Assistance Holdings Limited |
416 |
| Smith International, Inc. |
413 |
| CITGO Petroleum Corporation |
413 |
| SCANA Corporation |
412 |
| ONEOK, Inc. |
410 |
| Reliant Energy |
410 |
| AmeriGas Partners, L.P. |
409 |
| KBR, Inc. |
404 |
| Aker Solutions |
403 |
| Caraustar Industries, Inc. |
402 |
| Westinghouse Electric Company |
390 |
| BJ Services Company |
388 |
| Portland General Electric Company |
384 |
| Centrica plc |
375 |
| BG Group plc |
370 |
| General Atomics |
367 |
| CHS Inc. |
366 |
| MWH Global, Inc. |
366 |
| American Water Company, Inc. |
363 |
| Hydro-Quebec |
358 |
| SRP Salt River Project |
355 |
| OGE Energy Corp. |
353 |
| Chevron Phillips Chemical Company LP |
353 |
| CMS Energy Corporation |
350 |
| EOG Resources, Inc. |
350 |
| Northeast Utilities |
349 |
| Premier, Inc. |
344 |
| Wood Group |
343 |
| ICF International, Inc |
343 |
| Nalco Company |
341 |
| Kiewit Pacific |
329 |
| Lower Colorado River Authority |
329 |
| Dynegy Inc. |
326 |
| Seminole Electric Cooperative, Inc. |
323 |
| Pepco Holdings, Inc. |
323 |
| Pioneer Natural Resources Company |
322 |
| Murphy Oil Corporation |
318 |
| NV Energy Inc |
318 |
| Wisconsin Energy Corporation |
315 |
| Los Angeles Department of Water and Power |
310 |
| TECO Energy, Inc. |
306 |
| Southwest Power Pool |
305 |
| Michael Baker Corporation |
303 |
| ACI Worldwide |
301 |
| NRG Energy, Inc. |
294 |
| British Columbia Transmission Corporation |
287 |
| E.ON North America, Inc. |
285 |
| PNM Resources, Inc. |
284 |
| Westar Energy, Inc. |
283 |
| MidAmerican Energy Holdings Company |
282 |
| AGL Resources, Inc. |
279 |
| SCS Engineers |
278 |
| Marathon Petroleum Company |
276 |
| Safety-Kleen, Inc. |
276 |
| Calpine Corporation |
276 |
| National Renewable Energy Laboratory |
272 |
| Puget Energy Inc |
272 |
| Aera Energy LLC |
271 |
| Nebraska Public Power District |
270 |
| Southwest Gas Corporation |
268 |
| Enterprise Products Partners L.P |
266 |
| Husky Energy Inc. |
264 |
| Pentair, Inc. |
263 |
| Avista Corporation |
262 |
| Tenaska, Inc. |
261 |
| The Lincoln Electric Company |
260 |
| Spectra Energy Partners, L.P. |
260 |
| UniSource Energy Corporation |
258 |
| Noble Energy, Inc. |
258 |
| Briggs and Morgan, P.A. |
256 |
| E.ON UK plc |
251 |
| CPS Energy |
249 |
| Sacramento Municipal Utility District |
248 |
| Newfield Exploration Company |
247 |
| Southern Union Company |
244 |
| Alstom Power |
243 |
| Western Refining, Inc. |
240 |
| Jindal Steels |
240 |
| XTO Energy Inc. |
239 |
| Fortis Corporation |
238 |
| Oceaneering International, Inc. |
237 |
| Idaho Power Company |
236 |
| Suncor Energy Inc. |
235 |
| Integrys Energy Group, Inc. |
234 |
| Manitoba Hydro-Electric |
231 |
| Omaha Public Power District |
229 |
| Transocean Inc. |
224 |
| Hydro Aluminum North America |
222 |
| Hawaiian Electric Industries, Inc. |
221 |
| Marathon Ashland Petroleum LLC |
221 |
| McJunkin Red Man Corporation |
221 |
| Southwestern Energy Company |
220 |
| Flint Hills Resources, LP |
218 |
| M-I SWACO |
216 |
| Baltimore Gas and Electric Company |
215 |
| Direct Energy Marketing Limited |
214 |
| Questar Corporation |
214 |
| SaskPower |
214 |
| Day & Zimmermann |
213 |
| Bruce Power LP |
213 |
| British Columbia Hydro and Power Authority |
212 |
| Speedway SuperAmerica, LLC |
211 |
| Atomic Energy of Canada Limited |
211 |
| TRC Companies, Inc. |
211 |
| Hydro One Inc. |
209 |
| Scottish and Southern Energy plc |
209 |
| Veolia Environmental Services |
208 |
| Enron Creditors Recovery Corporation |
206 |
| Areva NC Inc |
204 |
| TNP Enterprises, Inc. |
204 |
| City of Anaheim |
203 |
