| Company Name | Entity type | Parent/Subsidiary/Independent | Headquarters | No. of Employees | Annual Revenue ($M) | |
|---|---|---|---|---|---|---|
| GT Energy - UK | Private | Independent | United Kingdom | XYZ | XYZ | |
| Stratic Energy (UK) Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Argent Energy (UK) Ltd | Private | Subsidiary (of John Swire & Sons (Green Investments) Ltd ) | United Kingdom | XYZ | XYZ | |
| Ansmann Energy (UK) Ltd. | Private | Independent | United Kingdom | XYZ | XYZ | |
| Warrego Energy UK Ltd | Private | Subsidiary (of Warrego Energy Ltd ) | United Kingdom | XYZ | XYZ | |
| Rebel Energy UK | Private | Independent | United Kingdom | XYZ | XYZ | |
| Solar Energy UK | Private | Independent | United Kingdom | XYZ | XYZ | |
| Neo Energy (Ukcs) Ltd | Private | Subsidiary (of Neo Energy Upstream UK Ltd ) | United Kingdom | XYZ | XYZ | |
| Offshore Energy UK Limited | Private | Independent | United Kingdom | XYZ | XYZ | |
| SOCAR Energy Ukraine LLC | Private | Subsidiary (of State Oil Company of the Azerbaijan Republic ) | Ukraine | XYZ | XYZ | |
| Finder Energy UK Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Masdar Energy UK Ltd | Private | Subsidiary (of Abu Dhabi Future Energy Co ) | United Kingdom | XYZ | XYZ | |
| Infinite Energy UK, Ltd. | Private | Independent | United Kingdom | XYZ | XYZ | |
| Bowalds Energy UK Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Green Energy (UK) plc | Private | Independent | United Kingdom | XYZ | XYZ | |
| Sembcorp Energy UK Ltd | Private | Subsidiary (of Sembcorp Industries Ltd ) | United Kingdom | XYZ | XYZ | |
| Evergreen Energy UK Ltd | Private | Parent | United Kingdom | XYZ | XYZ | |
| Wilderness Energy UK Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Ithaca Energy (UK) Ltd | Private | Subsidiary (of Ithaca Energy Ltd ) | United Kingdom | XYZ | XYZ | |
| Certas Energy UK Ltd | Private | Subsidiary (of DCC Plc ) | United Kingdom | XYZ | XYZ | |
| Siccar Point Energy UK Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Green Hedge Energy UK Ltd | Private | Subsidiary (of REEIF Storage Ltd ) | United Kingdom | XYZ | XYZ | |
| Eco-Energy UK Power Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Siemens Gamesa Renewable Energy UK Ltd | Private | Subsidiary (of Siemens Gamesa Renewable Energy SA ) | United Kingdom | XYZ | XYZ | |
| CPL Petroleum Ltd | Private | Independent | United Kingdom | XYZ | XYZ | |
| Valero Energy Corp | Public | Parent | United States of America | 9,813 | 113,977 | |
| Oracle Corporation UK Ltd. | Private | Subsidiary (of Oracle Corp ) | United Kingdom | XYZ | XYZ | |
| Energy Transfer LP | Public | Parent | United States of America | 12,558 | 89,876 | |
| State Atomic Energy Corporation Rosatom | Private | Parent | Russia | 288,500 | 223,834 | |
| Orsted UK Ltd | Private | Subsidiary (of Orsted AS ) | United Kingdom | XYZ | XYZ | |
| Dresser-Rand Co Ltd | Private | Subsidiary (of Siemens AG ) | United Kingdom | XYZ | XYZ | |
| Cenovus Energy Inc | Public | Parent | Canada | 5,938 | 53,368 | |
| PBF Energy Inc | Public | Parent | United States of America | 3,616 | 46,830 | |
| Suncor Energy Inc | Public | Parent | Canada | 16,922 | 46,538 | |
| AstraZeneca UK Ltd | Private | Subsidiary (of AstraZeneca Plc ) | United Kingdom | XYZ | XYZ | |
| Siemens Energy AG | Public | Parent | Germany | 92,000 | 34,288 | |
| NRG Energy Inc | Public | Parent | United States of America | 6,635 | 31,543 | |
| Duke Energy Corp | Public | Parent | United States of America | 27,605 | 28,768 | |
| Naturgy Energy Group SA | Public | Parent | Spain | 7,115 | 40,162 | |
| China Shenhua Energy Co Ltd | Public | Subsidiary (of China Energy Investment Corp Ltd) | China | 77,872 | 51,972 | |
| China Energy Engineering Corp Ltd | Public | Subsidiary (of China Energy Engineering Group Co Ltd) | China | 114,307 | 49,973 | |
| NextEra Energy Inc | Public | Parent | United States of America | 15,300 | 20,956 | |
| Sempra Energy | Public | Parent | United States of America | 15,390 | 12,857 | |
| Devon Energy Corp | Public | Parent | United States of America | 1,600 | 19,169 | |
| Constellation Energy Corp | Public | Parent | United States of America | 11,696 | 19,649 | |
| Eversource Energy | Public | Parent | United States of America | 9,626 | 12,217 | |
| Santander UK PLC | Public | Subsidiary (of Santander UK Group Holdings plc ) | United Kingdom | 19,704 | 7,908 | |
| Camelot UK Lotteries Ltd | Private | Subsidiary (of Ontario Teachers' Pension Plan ) | United Kingdom | XYZ | XYZ | |
| Telefonica UK Ltd | Private | Subsidiary (of O2 Holdings Ltd ) | United Kingdom | 5,769 | 7,545 | |
| Jizhong Energy Group Co Ltd | Private | Parent | China | XYZ | XYZ |
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