| Kennedy Engineering |
| Kiewit Mining Group |
| LGL Limited |
| Lowham Engineering |
| LT Environmental |
| MACTEC, Inc. |
| MK Centennial |
| Montgomery Watson, MWH Americas, Inc. |
| Mountaineer Wind Energy |
| Natural Resource Group |
| Navitas |
| NCASI |
Noble Environmental Power, LLC |
| Northern Pacific Railroad |
| Northwestern Wind Power |
| Northwest Wildlife Consultants, Inc. |
| NPS |
| PacifiCorp |
| Parsons Brinkerhoff |
| Parsons Engineering Science, Inc. |
PBS & J |
| PGE |
| Plum Creek Timber Company |
| PMPC Consulting Engineers |
| PowerEng. |
| PSMFC |
| Puget Sound Energy |
| Questar |
| RCG/ Hagler, Bialey |
| Recon |
| Renewable Energy Systems, N. A. Inc. |
| Rescom Environmental Corp. |
| Roberts Contruction |
| SAIC |
| SeaWest Windpower, Inc. |
| Shell |
| Shell Wind Energy |
| Snell Environmental Group |
| States West Water Resources Corp. |
| Telecaset Wind Power Partners, LLC |
| Texaco Refining & Marketing, Inc. |
| Third Planet Wind Power |
| TRC Mariah Associates |
| Triton Coal Company |
| Truex Fisher |
| Union Pacific Resources, Corp. |
| UNIsite Corporation |
| URS Corporation |
| VERA |
| Versair |
| Versar |
| Washington Woods |
| We Energies |
| Wenk Associates |
| Weyerhaeuser |
| Windholdings |
| Worthington, Lenhart & Carpenter |
| Xcel Energy |
| |
