| Air New Zealand |
| Arkansas Electric Cooperative |
| Brazos Valley Electric, LP |
| Cinergy Solutions |
| City of Ames |
| City of Tallahassee |
| Colorado Springs Utilities |
| ConEdison Energy |
| Denver City Power Associates |
| Dynegy |
| Entergy |
| Enterprise Products |
| Formosa Plastics Corporation |
| Gainesville Regional Uitilities |
| Granite Ridge Energy |
| Jacksonville Energy Authority |
| KeySpan |
| LADWP |
| Lafayette Utilities System |
| Lincoln Generating Facility |
| Louisiana Generating, LLC |
| Lubbock Power & Light |
| MidAmerican Energy Company |
| Motiva Enterprises, LLC |
| Nevada CoGeneration Assoc. |
| Occidental Permian |
| Pedricktown CoGen, LP |
| PEPCO |
| PPG Industries, Inc. |
| Prime Energy |
| SMEPA |
| South Mississippi Electric Power |
| Texas Gas Transmission |
| TOTAL Petrochemicals Fina |
| TransAlta Centralia Generation |
| TVA |
| TXU Generation Company |
| Valero Refining |
| Williams Field Services |
| Xcel |
