| Name | Company Number | Date Appointed | Rating |
|---|
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CITIGEN (LONDON) LIMITED | 02427823 | 01/01/2008 | 17/05/2010 | Bronze |
| E.ON CLIMATE & RENEWABLES CARBON SOURCING LIMITED | 02884146 | 01/09/2001 | 07/05/2003 | Dissolved |
| E.ON UK CHP LIMITED | 02684288 | 01/01/2008 | 17/05/2010 | Silver |
| E.ON UK GREEN FUNDING SOLUTIONS LIMITED | 02730697 | 01/01/2008 | 17/05/2010 | Gold |
| HOLFORD GAS STORAGE LIMITED | SC254265 | 01/01/2008 | 01/10/2008 | Silver |
| HORIZON NUCLEAR POWER LIMITED | 06660388 | 19/02/2009 | 01/10/2011 | Silver |
| HORIZON NUCLEAR POWER OLDBURY LIMITED | 06811995 | 19/02/2009 | 01/10/2011 | Amber |
| HORIZON NUCLEAR POWER SERVICES LIMITED | 06812099 | 19/02/2009 | 01/10/2011 | Gold |
| HORIZON NUCLEAR POWER WYLFA LIMITED | 06811987 | 19/02/2009 | 01/10/2011 | Bronze |
| INTERNATIONAL POWER (ISLE OF MAN) LIMITED | FC028093 | 16/01/2008 | 16/01/2008 | Insolvent |
| INTERNATIONAL POWER (UCH) | 03095019 | 16/01/2004 | 09/02/2005 | Dissolved |
| INTERNATIONAL POWER (UCH) SERVICES LIMITED | 03141679 | 03/03/2004 | 09/02/2005 | Gold |
| MAGNOLIA POWER (TPL) | 02579333 | 03/03/2004 | 26/04/2005 | Dissolved |
| MIDLANDS GENERATION (OVERSEAS) LIMITED | 02772596 | 16/01/2004 | 29/04/2005 | Dissolved |
| MIDLANDS POWER (UK) LIMITED | 02251099 | 03/03/2004 | 29/04/2004 | Dissolved |
| MIDLANDS POWER INTERNATIONAL LIMITED | 02618314 | 16/01/2004 | 29/04/2005 | Dissolved |
| Midlands Power (Consultancy) Ltd | 02585916 | 03/03/2004 | 29/04/2005 | Dissolved |
| Midlands Power (Europe) Ltd | 02776789 | 03/03/2004 | 29/04/2005 | Dissolved |
| Midlands Power (H P L) Ltd | 02598875 | 03/03/2004 | 29/04/2005 | Dissolved |
| Midlands Power (Indus) Ltd | 03094893 | 03/03/2004 | 29/04/2005 | Dissolved |
| NUCLEAR INDUSTRY ASSOCIATION | 02804518 | 11/09/2008 | 02/12/2009 | Silver |
| POWERGEN INTERNATIONAL | 03548380 | 01/07/2002 | 29/04/2005 | Dissolved |
| THOR COGENERATION LIMITED | 05992364 | 24/11/2008 | 17/05/2010 | Dissolved |
| THOR HOLDINGS LIMITED | 06323377 | 24/11/2008 | 17/05/2010 | Dissolved |