| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Fibre Power Ltd | 05445543 | 31/12/2007 | Dissolved |
| HYDRO ELECTRIC PENSION SCHEME TRUSTEES LIMITED | SC567945 | 06/06/2017 | Not Trading |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Cash Collect Ltd | SC328157 | 08/10/2007 | 02/03/2010 | Dissolved |
| FIBRE FUEL LIMITED | 02902165 | 31/12/2007 | 02/03/2010 | Not Trading |
| FIBRE POWER (SLOUGH) LIMITED | 02902170 | 31/12/2007 | 02/03/2010 | Bronze |
| KEADBY CONSTRUCTION LIMITED | 02722985 | 26/09/2005 | 02/03/2010 | Dissolved |
| KEADBY DEVELOPMENTS LIMITED | 02691516 | 26/09/2005 | 02/03/2010 | Not Trading |
| KEADBY GENERATION LIMITED | 02729513 | 29/09/2004 | 02/03/2010 | Silver |
| KEADBY POWER LIMITED | 02548042 | 29/10/2004 | 02/03/2010 | Dissolved |
| MARCHWOOD POWER LIMITED | 04229146 | 18/10/2007 | 19/08/2010 | Silver |
| POWER FROM WASTE LIMITED | 02902302 | 31/12/2007 | 02/03/2010 | Not Trading |
| SIMEC USKMOUTH POWER LIMITED | 05104786 | 13/08/2009 | 02/03/2010 | Silver |
| SLOUGH DOMESTIC ELECTRICITY LIMITED | 03486588 | 31/12/2007 | 02/03/2010 | Not Trading |
| SLOUGH ELECTRICITY CONTRACTS LIMITED | 02902219 | 31/12/2007 | 02/03/2010 | Silver |
| SLOUGH ENERGY SUPPLIES LIMITED | 02474514 | 31/12/2007 | 02/03/2010 | Not Trading |
| SLOUGH HEAT & POWER LIMITED | 00174142 | 31/12/2007 | 02/03/2010 | Bronze |
| SLOUGH UTILITY SERVICES LIMITED | 03486590 | 31/12/2007 | 02/03/2010 | One Red Flag |
| SSE ENERGY MARKETS LIMITED | 09442646 | 20/09/2019 | 30/09/2020 | Bronze |
| SSE ENERGY SUPPLY LIMITED | 03757502 | 20/09/2019 | 30/09/2020 | Bronze |
| SSE GENERATION LIMITED | 02310571 | 01/10/2002 | 12/03/2010 | Amber |
| SSE LEASING LIMITED | SC165387 | 14/10/2002 | 02/03/2010 | Dissolved |
| SSE POWER LIMITED | 02372114 | 29/10/2004 | 02/03/2010 | Dissolved |
| SSE TODDLEBURN LIMITED | SC259104 | 20/12/2007 | 02/03/2010 | Silver |
| SSE TRADING LIMITED | 04336842 | 30/08/2013 | 30/09/2020 | Gold |
| SSE USKMOUTH ACQUISITION COMPANY LIMITED | 06917629 | 29/07/2009 | 02/03/2010 | Dissolved |
| SSE VIKING LIMITED | 06021053 | 16/01/2007 | 11/01/2013 | Bronze |