| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Electricity Association Ltd | 02367010 | 03/01/2005 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BARKING POWER LIMITED | 02354681 | 17/10/2012 | 02/11/2015 | Amber |
| ELECTRICITY ASSOCIATION SERVICES LIMITED | 02366837 | 03/01/2005 | 31/01/2007 | Dissolved |
| ENERGY NETWORKS ASSOCIATION LIMITED | 04832301 | 01/04/2005 | 31/01/2007 | Bronze |
| ENGINEERS AGAINST POVERTY | 03613056 | 24/07/2013 | 23/07/2014 | Amber |
| NORTHMERE LIMITED | 03232826 | 31/03/2005 | 31/01/2007 | Amber |
| SCOTTISH AND SOUTHERN ENERGY POWER DISTRIBUTION LIMITED | SC213459 | 01/04/2014 | 26/10/2022 | Gold |
| SCOTTISH HYDRO ELECTRIC POWER DISTRIBUTION PLC | SC213460 | 01/04/2014 | 30/06/2024 | Silver |
| SCOTTISH HYDRO ELECTRIC TRANSMISSION PLC | SC213461 | 01/04/2014 | 01/02/2023 | Bronze |
| SOUTHERN ELECTRIC POWER DISTRIBUTION PLC | 04094290 | 01/04/2014 | 30/06/2024 | Silver |
| SP DISTRIBUTION PLC | SC189125 | 06/09/2005 | 31/01/2007 | Silver |
| SP GAS LIMITED | SC170918 | 01/04/2003 | 17/01/2006 | Dissolved |
| SP MANWEB PLC | 02366937 | 06/09/2005 | 31/01/2007 | Bronze |
| SP NETWORK CONNECTIONS LIMITED | 04290066 | 05/10/2005 | 17/01/2006 | Dissolved |
| SP POWER SYSTEMS LIMITED | SC215841 | 01/04/2003 | 18/11/2005 | Bronze |
| SP TRANSMISSION PLC | SC189126 | 06/09/2005 | 31/01/2007 | Silver |
| SSEN DISTRIBUTION LIMITED | SC742389 | 01/05/2023 | 30/06/2024 | Silver |
| SUSIEPHONE LIMITED | SC157626 | 08/01/1999 | 28/04/2006 | Dissolved |
| THAMES POWER LIMITED | 02208349 | 17/10/2012 | 02/11/2015 | Dissolved |