| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CLEAN POWER HYDROGEN PLC | 13574281 | 16/02/2022 | Silver |
| SOUTH EAST WATER LIMITED | 02679874 | 24/02/2022 | One Red Flag |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| BRITNED DEVELOPMENT LIMITED | 04251409 | 02/10/2006 | 04/06/2007 | Silver |
| CADENT FINANCE PLC | 05895068 | 08/09/2016 | 15/02/2019 | Silver |
| CADENT GAS LIMITED | 10080864 | 08/09/2016 | 15/02/2019 | Bronze |
| CADENT SERVICES LIMITED | 10080921 | 08/09/2016 | 15/02/2019 | Bronze |
| ENERGY NETWORKS ASSOCIATION LIMITED | 04832301 | 24/10/2016 | 15/02/2019 | Bronze |
| NATIONAL GAS TRANSMISSION PLC | 02006000 | 01/07/2015 | 01/10/2016 | Silver |
| NATIONAL GRID CARBON LIMITED | 03932833 | 25/06/2009 | 31/10/2012 | Silver |
| NATIONAL GRID GRAIN LNG LIMITED | 04463679 | 30/07/2002 | 03/01/2003 | Gold |
| NATIONAL GRID UK PENSION SCHEME TRUSTEE LIMITED | 06140457 | 01/10/2014 | 01/10/2015 | Not Trading |
| NORTHERN GAS NETWORKS LIMITED | 05167070 | 20/05/2005 | 31/05/2005 | Silver |
| National Grid Lng Ltd | 04045783 | 12/08/2002 | 03/01/2003 | Dissolved |
| QUADGAS FINANCE PLC | 10619488 | 31/03/2017 | 15/02/2019 | Bronze |
| SCOTLAND GAS NETWORKS PLC | SC264065 | 20/05/2005 | 01/06/2005 | Silver |
| SOUTHERN GAS NETWORKS PLC | 05167021 | 20/05/2005 | 01/06/2005 | Bronze |
| SPAA LIMITED | 04365599 | 09/07/2004 | 01/11/2004 | Dissolved |
| WALES & WEST UTILITIES LIMITED | 05046791 | 20/05/2005 | 01/06/2005 | Silver |