| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ATLANTIC GAS LIMITED | SC288230 | 29/11/2005 | Dissolved |
| Chessleigh Ltd | 03536657 | 27/03/1998 | Dissolved |
| SCOTTISH HYDRO ELECTRIC GAS LIMITED | SC288231 | 29/11/2005 | Dissolved |
| SCOTTISH HYDRO ELECTRIC POWER DISTRIBUTION PLC | SC213460 | 03/04/2023 | Silver |
| SOUTHERN ELECTRIC POWER DISTRIBUTION PLC | 04094290 | 03/04/2023 | Silver |
| SSE FREIGHT LIMITED | 05146257 | 03/09/2004 | Dissolved |
| SSE PLC | SC117119 | 01/01/2002 | Silver |
| SSEN DISTRIBUTION LIMITED | SC742389 | 03/04/2023 | Gold |
| South Wales Energy Ltd | 03870373 | 07/08/2000 | Dissolved |
| Wales Electricity Ltd | 03870377 | 07/08/2000 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ASSOCIATION OF ELECTRICITY PRODUCERS LIMITED | 02779199 | 26/04/2012 | 01/01/2020 | Bronze |
| ATLASCONNECT LIMITED | SC241790 | 29/03/2019 | 01/02/2023 | Not Trading |
| ENERGY RETAIL ASSOCIATION LIMITED | 04844678 | 19/09/2003 | 31/03/2014 | Not Trading |
| ENFINIUM ENERGY LIMITED | SC286672 | 28/09/2005 | 20/09/2011 | Silver |
| NEOS NETWORKS LIMITED | SC213457 | 29/03/2019 | 01/02/2023 | Amber |
| NNXYZ LIMITED | 03477297 | 29/03/2019 | 01/02/2023 | Insolvent |
| OVO (S) ELECTRICITY LIMITED | 04094263 | 14/11/2001 | 29/11/2013 | Amber |
| OVO (S) ENERGY SERVICES LIMITED | 11046212 | 24/06/2019 | 15/01/2020 | Bronze |
| OVO (S) ENERGY SOLUTIONS LIMITED | SC386054 | 30/03/2011 | 29/11/2013 | One Red Flag |
| OVO (S) GAS LIMITED | 02716495 | 13/03/1997 | 29/11/2013 | Amber |
| OVO (S) HOME SERVICES LIMITED | SC292102 | 23/12/2005 | 29/11/2013 | Dissolved |
| OVO (S) METERING LIMITED | SC318950 | 19/03/2007 | 29/11/2013 | Dissolved |
| ROCKROSE UKCS15 LIMITED | SC375371 | 23/03/2010 | 25/04/2013 | Silver |
| SEABANK POWER LIMITED | 02591188 | 07/06/2005 | 14/11/2013 | Gold |
| SHIFTMCO123 LTD | 11047416 | 03/11/2017 | 17/05/2024 | Dissolved |
| SIMPLE2 LIMITED | 03976920 | 06/02/2002 | 08/10/2013 | Dissolved |
| SSE ENERGY SUPPLY LIMITED | 03757502 | 07/08/2000 | 29/11/2013 | Silver |
| SSE GREEN DEAL LIMITED | SC432919 | 28/09/2012 | 29/11/2013 | Dissolved |
| SSE HEAT NETWORKS LIMITED | SC303682 | 09/06/2006 | 27/04/2010 | Amber |
| SSE RETAIL LIMITED | SC213458 | 01/12/2005 | 29/11/2013 | Gold |
| SSE SERVICES PLC | 02366879 | 22/03/2010 | 19/08/2013 | Silver |
| SSE TRADING LIMITED | 04336842 | 09/05/2002 | 28/02/2013 | Gold |
| SSE(SE) QUEST TRUSTEE LIMITED | 03487059 | 24/05/1999 | 19/08/2013 | Not Trading |
| SWALEC GAS LIMITED | 02624695 | 07/08/2000 | 29/11/2013 | Dissolved |