| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CALENERGY RESOURCES (UK) LIMITED | 11999607 | 28/10/2019 | Amber |
| CALENERGY RESOURCES LIMITED | 04508881 | 28/02/2011 | Amber |
| INTEGRATED UTILITY SERVICES LIMITED | 02964844 | 22/01/2007 | Gold |
| NORTHERN ELECTRIC FINANCE PLC | 03070482 | 16/10/2009 | Amber |
| NORTHERN POWERGRID (NORTHEAST) PLC | 02906593 | 12/11/2002 | Silver |
| NORTHERN POWERGRID (YORKSHIRE) PLC | 04112320 | 12/11/2002 | Gold |
| NORTHERN POWERGRID HOLDINGS COMPANY | 03476201 | 16/01/2009 | Bronze |
| NORTHERN POWERGRID LIMITED | 03271033 | 16/01/2009 | Gold |
| NORTHERN POWERGRID METERING LIMITED | 07647856 | 11/06/2013 | Bronze |
| NORTHERN POWERGRID UK HOLDINGS | 03270696 | 16/01/2009 | Amber |
| YORKSHIRE ELECTRICITY GROUP PLC | 02366995 | 05/07/2007 | Silver |
| YORKSHIRE POWER GROUP LIMITED | 03227432 | 05/07/2007 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CALENERGY GAS (HOLDINGS) LIMITED | 02772202 | 28/02/2011 | 29/08/2024 | Bronze |
| NORTHERN ELECTRIC PLC | 02366942 | 20/04/2007 | 14/04/2022 | Silver |
| NORTHERN ELECTRIC PROPERTIES LIMITED | 02522939 | 16/10/2009 | 29/08/2024 | Gold |
| NORTHERN POWERGRID GAS LIMITED | 04328138 | 28/02/2011 | 29/08/2024 | Gold |
| NORTHERN TRANSPORT FINANCE LIMITED | 02311977 | 16/10/2009 | 01/06/2024 | Gold |