| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| CALENERGY GAS LIMITED | 04370508 | 15/12/2016 | One Red Flag |
| CALENERGY INFRASTRUCTURE LIMITED | 07632910 | 30/08/2024 | One Red Flag |
| CALENERGY NORTH SEA LIMITED | 07632999 | 30/08/2024 | One Red Flag |
| CALENERGY RESOURCES (AUSTRALIA) LIMITED | 06550141 | 15/12/2016 | N/A |
| CALENERGY RESOURCES (OPERATOR) LIMITED | 15639524 | 12/04/2024 | Amber |
| CALENERGY RESOURCES (UK) LIMITED | 11999607 | 28/10/2019 | Amber |
| CALENERGY RESOURCES LIMITED | 04508881 | 15/12/2016 | Amber |
| CALENERGY SNS LIMITED | 08619688 | 30/08/2024 | One Red Flag |
| INTEGRATED UTILITY SERVICES LIMITED | 02964844 | 15/12/2016 | Gold |
| IUS IRELAND LIMITED | FC027454 | 15/12/2016 | Bronze |
| NORTHERN ELECTRIC FINANCE PLC | 03070482 | 15/12/2016 | Amber |
| NORTHERN POWERGRID (NORTHEAST) PLC | 02906593 | 15/12/2016 | Silver |
| NORTHERN POWERGRID (YORKSHIRE) PLC | 04112320 | 15/12/2016 | Gold |
| NORTHERN POWERGRID GAS LIMITED | 04328138 | 15/12/2016 | Gold |
| NORTHERN POWERGRID HOLDINGS COMPANY | 03476201 | 28/03/2018 | Bronze |
| NORTHERN POWERGRID LIMITED | 03271033 | 05/04/2018 | Gold |
| NORTHERN POWERGRID METERING LIMITED | 07647856 | 15/12/2016 | Bronze |
| NORTHERN POWERGRID UK HOLDINGS | 03270696 | 05/04/2018 | Amber |
| YORKSHIRE ELECTRICITY GROUP PLC | 02366995 | 15/12/2016 | Silver |
| YORKSHIRE POWER GROUP LIMITED | 03227432 | 15/12/2016 | Silver |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| CALENERGY GAS (HOLDINGS) LIMITED | 02772202 | 15/12/2016 | 29/08/2024 | Bronze |
| ELECTRALINK LIMITED | 03271981 | 28/01/2021 | 16/02/2021 | Gold |
| NORTHERN ELECTRIC PLC | 02366942 | 28/03/2018 | 14/04/2022 | Silver |
| NORTHERN ELECTRIC PROPERTIES LIMITED | 02522939 | 15/12/2016 | 29/08/2024 | Gold |
| NORTHERN TRANSPORT FINANCE LIMITED | 02311977 | 31/01/2017 | 01/11/2024 | Gold |