| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BSC CO LIMITED | 03837126 | 01/09/2022 | Not Trading |
| ELEXON CLEAR LIMITED | 04027298 | 01/03/2019 | Bronze |
| ELEXON LIMITED | 03782949 | 01/03/2019 | Amber |
| EMR SETTLEMENT LIMITED | 08924703 | 01/11/2021 | Amber |
| OIL AND GAS AUTHORITY | 09666504 | 01/10/2021 | Silver |
| POOLIT LIMITED | 03646741 | 01/09/2022 | Dissolved |
| POOLSERCO LIMITED | 03646729 | 01/09/2022 | Dissolved |
| THE UK BUSINESS COUNCIL FOR SUSTAINABLE ENERGY | 04275546 | 25/10/2007 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASSOCIATION OF ELECTRICITY PRODUCERS LIMITED | 02779199 | 08/02/2010 | 01/01/2020 | Silver |
| BSC CO LIMITED | 03837126 | 01/11/2021 | 04/04/2022 | Not Trading |
| E.ON ENERGY GAS (EASTERN) LIMITED | 04060387 | 22/03/2017 | 26/11/2020 | Not Trading |
| E.ON ENERGY GAS (NORTHWEST) LIMITED | 02850031 | 22/03/2017 | 26/11/2020 | Not Trading |
| E.ON ENERGY SOLUTIONS LIMITED | 03407430 | 10/11/2016 | 26/11/2020 | Gold |
| E.ON UK ENERGY MARKETS LIMITED | 09884706 | 01/06/2016 | 26/11/2020 | Bronze |
| E.ON UK HOLDING COMPANY LIMITED | 01313782 | 31/12/2016 | 26/11/2020 | Bronze |
| E.ON UK INDUSTRIAL SHIPPING LIMITED | 03412581 | 22/03/2017 | 26/11/2020 | Not Trading |
| E.ON UK PLC | 02366970 | 13/02/2013 | 26/11/2020 | Gold |
| E.ON UK STEVEN’S CROFT LIMITED | 10253456 | 14/11/2016 | 25/05/2018 | Gold |
| ECONOMY POWER LIMITED | 03385578 | 22/03/2017 | 26/11/2020 | Not Trading |
| HORIZON NUCLEAR POWER LIMITED | 06660388 | 02/12/2011 | 23/11/2012 | Silver |
| HORIZON NUCLEAR POWER OLDBURY LIMITED | 06811995 | 02/12/2011 | 23/11/2012 | Amber |
| HORIZON NUCLEAR POWER SERVICES LIMITED | 06812099 | 02/12/2011 | 23/11/2012 | Gold |
| HORIZON NUCLEAR POWER WYLFA LIMITED | 06811987 | 02/12/2011 | 23/11/2012 | Bronze |
| POOLIT LIMITED | 03646741 | 01/11/2021 | 04/04/2022 | Dissolved |
| POOLSERCO LIMITED | 03646729 | 01/11/2021 | 04/04/2022 | Dissolved |