| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| DERWENT COGENERATION LIMITED | 02650621 | 01/12/2019 | 12/11/2020 | Dissolved |
| GB DEVELOPERS LIMITED | 04480584 | 01/12/2019 | 17/09/2021 | Gold |
| MERSEYSIDE ENERGY RECOVERY HOLDINGS LTD | 07983197 | 12/08/2020 | 22/10/2021 | Silver |
| MERSEYSIDE ENERGY RECOVERY LTD | 08033025 | 12/08/2020 | 22/10/2021 | Silver |
| REPONO HOLDCO 1 LIMITED | 09844502 | 01/12/2019 | 17/09/2021 | Bronze |
| SEMBCORP HOLDINGS LIMITED | 06707340 | 01/07/2021 | 17/09/2021 | Silver |
| SEMBCORP INVESTMENTS (CHINA) LIMITED | 06894845 | 01/07/2021 | 17/09/2021 | Silver |
| SEMBCORP UTILITIES (UK) LIMITED | 04636301 | 01/12/2019 | 17/09/2021 | Gold |
| SEMBCORP UTILITIES SERVICES LIMITED | 03757398 | 01/07/2021 | 17/09/2021 | Gold |
| STABILITY ISLAND PROJECTS LIMITED | 13429231 | 31/05/2021 | 17/09/2021 | Dissolved |
| UK CAPACITY RESERVE LIMITED | 09152381 | 01/12/2019 | 17/09/2021 | Gold |
| UK ENERGY RESERVE LIMITED | 10260309 | 01/12/2019 | 17/09/2021 | Bronze |
| UK POWER RESERVE (ASFORDBY) LIMITED | 07618247 | 01/12/2019 | 17/09/2021 | Amber |
| UK POWER RESERVE (TRUMFLEET) LTD | 07004203 | 01/12/2019 | 17/09/2021 | Silver |
| UK POWER RESERVE LIMITED | 07385282 | 01/12/2019 | 17/09/2021 | Bronze |
| UK UTILITY RESERVE LIMITED | 11008814 | 01/12/2019 | 17/09/2021 | Gold |
| WILTON ENERGY LIMITED | 04557531 | 01/12/2019 | 17/09/2021 | Bronze |