| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASSOCIATION OF ELECTRICITY PRODUCERS LIMITED | 02779199 | 10/12/2020 | 15/09/2022 | Silver |
| DERWENT COGENERATION LIMITED | 02650621 | 01/12/2019 | 12/11/2020 | Dissolved |
| FLEX ASSURE LIMITED | 11652552 | 14/02/2020 | 11/03/2022 | Silver |
| GB DEVELOPERS LIMITED | 04480584 | 01/12/2019 | 18/10/2022 | Silver |
| MERSEYSIDE ENERGY RECOVERY HOLDINGS LTD | 07983197 | 02/11/2021 | 21/09/2022 | Silver |
| MERSEYSIDE ENERGY RECOVERY LTD | 08033025 | 02/11/2021 | 21/09/2022 | Silver |
| REGEN SW | 04554636 | 26/04/2018 | 22/07/2024 | Gold |
| REPONO HOLDCO 1 LIMITED | 09844502 | 01/12/2019 | 18/10/2022 | Bronze |
| SEMBCORP UTILITIES (UK) LIMITED | 04636301 | 01/12/2019 | 18/10/2022 | Silver |
| UK CAPACITY RESERVE LIMITED | 09152381 | 01/12/2019 | 18/10/2022 | Gold |
| UK ENERGY RESERVE LIMITED | 10260309 | 01/12/2019 | 18/10/2022 | Bronze |
| UK POWER RESERVE (ASFORDBY) LIMITED | 07618247 | 01/12/2019 | 18/10/2022 | One Red Flag |
| UK POWER RESERVE (TRUMFLEET) LTD | 07004203 | 01/12/2019 | 18/10/2022 | Bronze |
| UK POWER RESERVE LIMITED | 07385282 | 01/12/2019 | 18/10/2022 | Bronze |
| UK UTILITY RESERVE LIMITED | 11008814 | 01/12/2019 | 18/10/2022 | Silver |
| WILTON ENERGY LIMITED | 04557531 | 01/12/2019 | 29/03/2022 | Bronze |
| XOSERVE LIMITED | 05046877 | 22/11/2018 | 31/10/2019 | Silver |