| Name |
|---|
| AGL Resources |
| American Gas Association Natural gas utility trade association |
| American Iron and Steel Institute |
| American Natural Gas Alliance Inc. Representing North America’s largest independent natural gas exploration and production companies |
| Anadarko Petroleum Corporation Independent oil and gas producer |
| BP plc Global energy company |
| Braskem America Brazilian chemical company |
| Calpine Geothermal and Gas-fired energy; agreed to sale to Constellation Energy in January 2025 |
| Chesapeake Energy Natural gas producer |
| Chevron Energy Company |
| CMS Energy Large Michigan electricity and natural gas utility |
| Constellation Energy Group, Inc. Energy company, the nation’s largest nuclear power plant operator; agreed to buy Calpine energy for $16.4 billion in January 2025 |
| Devon Energy Corporation An independent oil and natural gas exploration and production company. |
| DTE Energy Electric utilty company supplying electricity for residential and commercial use |
| Duke Energy Corporation Electric utilty company supplying electricity for residential and commercial use |
| El Paso Corporation Natural gas and related energy products |
| ExxonMobil Oil and gas exploration, production, and marketing |
| FMC Corporation A diversified chemical company |
| Halliburton Company parent organization |
| Howard Capital Management Money managers |
| Independent Petroleum Association of America Oil and gas trade group |
| Industrial Minerals Association North America Mining trade association |
| Loews Corporation Loews Corporation is one of the largest diversified holding companies in the United States, with five operating subsidiaries |
| Marathon Oil Corporation Int'l energy co. engaged in oil/gas exploration, production, transportation, and marketing |
| MDU Resources Group |
| National Fuel Gas Energy Company with headquarters near Buffalo, NY |
| National Grid USA One of the largest investor-owned energy companies in the world. Covering Massachusetts, New York, Rhode Island and the UK. |
| NiSource Gas Transmission & Storage Gas trasmission & storage company |
| Royal Dutch Shell Global oil and gas corp |
| San Leon Energy PLC Oil and gas projects in Europe, North America and Morocco |
| Sempra North American energy infrastructure company based in San Diego |
| Spectra Energy Corp. Natural gas pipeline company |
| Tenaska Energy |
| UIL Holdings Parent of electric utility The United Illuminating Company |
| Vectren |
| Williams Companies, Inc. Natural gas pipeline company based in Tulsa, Oklahoma |
| Xcel Energy Inc. Electricity and Natural Gas Company serving several Midwestern and Western states. Revenues are $11 billion. |