| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| ADAMSON DEL 1 LIMITED | 04187357 | 27/03/2001 | Dissolved |
| ADAMSON UDH LIMITED | 10503601 | 30/11/2016 | Dissolved |
| Adamson 2005 Ltd | 01668348 | 22/05/1997 | Dissolved |
| BIOGAS TECHNOLOGY CARBON LIMITED | 06798648 | 23/03/2009 | Dissolved |
| BIOGEN POWER LIMITED | 05547534 | 23/01/2008 | Dissolved |
| DONCASTER ENERGY RECOVERY LIMITED | 06636660 | 31/03/2016 | Dissolved |
| ENERGOS LIMITED | 03109022 | 18/07/1996 | Dissolved |
| IRVINE ENERGY RECOVERY LIMITED | 06416410 | 09/11/2007 | Dissolved |
| LISBURN ENERGY RECOVERY LIMITED | NI071660 | 31/03/2016 | Dissolved |
| Norgen Land Fill Gas Ltd | 02437203 | 22/05/1997 | Dissolved |
| SWITCH2 UDH LIMITED | 10503543 | 30/11/2016 | Dissolved |
| URSA MAJOR MANAGEMENT LTD | FC021797 | 24/04/1999 | Dissolved |
| W2E CONTRACTS (NO. 1) LIMITED | 10106904 | 06/04/2016 | Dissolved |
| W2E CONTRACTS (NO. 2) LIMITED | 10231646 | 14/06/2016 | Dissolved |
| W2E INVESTMENTS LIMITED | 08548278 | 05/07/2013 | Dissolved |
| WASTE GAS TECHNOLOGY UK LIMITED | 03051278 | 20/05/2016 | Dissolved |
| YLEM UDH LIMITED | 10503474 | 30/11/2016 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| ADAMSON DEL 2 LIMITED | 02475151 | 03/05/1997 | 01/12/1998 | Dissolved |
| ADAMSON DEL 3 LIMITED | 02961734 | 22/05/1997 | 01/12/1998 | Dissolved |
| ADAMSON DEL 4 LIMITED | 05157967 | 02/10/2007 | 01/10/2009 | Not Trading |
| ADAMSON DEL 5 LIMITED | 10259441 | 01/07/2016 | 25/10/2016 | Dissolved |
| ADAMSON DEL 6 LIMITED | 10144978 | 25/04/2016 | 21/12/2016 | Dissolved |
| BIOGAS TECHNOLOGY LIMITED | 02323287 | 04/05/2007 | 31/12/2018 | Silver |
| CENTRICA BUSINESS SOLUTIONS (GENERATION) LIMITED | 02592745 | 03/05/1997 | 01/12/1998 | Gold |
| CENTRICA BUSINESS SOLUTIONS UK LIMITED | 01874716 | 03/05/1997 | 01/12/1998 | Amber |
| CMR CONSULTANTS LIMITED | 03192206 | 02/10/2007 | 31/12/2018 | One Red Flag |
| Combined Power (Central) Ltd | 02592831 | 03/05/1997 | 01/12/1998 | Dissolved |
| Combined Power (North) Ltd | 02592846 | 03/05/1997 | 01/12/1998 | Dissolved |
| ENER-G SERVICES CO LIMITED | 03664148 | 02/10/2007 | 01/10/2009 | Dissolved |
| ENERGOS LIMITED | 03109022 | 14/12/1995 | 21/03/1996 | Dissolved |
| ENERGOS LIMITED | 03109022 | 14/12/1995 | 21/03/1996 | Dissolved |
| ENERGY TEAM (MIDLANDS) LTD | 02913371 | 01/10/2009 | 10/04/2015 | One Red Flag |
| KNOWSLEY ENERGY RECOVERY LIMITED | 07058988 | 15/04/2010 | 11/03/2022 | Not Trading |
| NATURAL POWER INTERNATIONAL LIMITED | 09418242 | 03/02/2015 | 14/06/2017 | Dissolved |
| Norgen (Belper) Ltd | 02994645 | 22/05/1997 | 01/12/1998 | Dissolved |
| Norgen (Ffestiniog) Ltd | 02900853 | 22/05/1997 | 01/12/1998 | Dissolved |
| THE ASSOCIATION FOR RENEWABLE ENERGY AND CLEAN TECHNOLOGY | 04241430 | 27/06/2001 | 27/12/2015 | Bronze |
| VIRIDIS ENERGY (NORGEN) LIMITED | 03059500 | 24/02/1998 | 06/04/2006 | Silver |
| W2E TECHNOLOGY LIMITED | 10107075 | 06/04/2016 | 07/11/2016 | Dissolved |
| YLEM ENERGY LIMITED | 02152229 | 22/05/1997 | 31/12/2018 | Silver |
| YLEM GROUP LIMITED | 03516925 | 20/02/1998 | 31/12/2018 | Gold |
| YLEM RENEWABLES LIMITED | 10940218 | 31/08/2017 | 31/12/2018 | One Red Flag |