| uk power networks holdings limited | £1.8b | £18.6b | Nov 2010 | - | Open | Director |
| london power networks plc | £485.4m | £5.6b | Nov 2010 | - | Open | Director |
| eastern power networks plc | £710.2m | £5.3b | Nov 2010 | - | Open | Director |
| south eastern power networks plc | £479.5m | £3.9b | Nov 2010 | - | Open | Director |
| cki number 1 limited | - | £3.9b | May 2011 | - | Open | Director |
| cki number 2 limited | - | £3.8b | May 2011 | - | Open | Director |
| uk power networks services (development) limited | - | £3.5b | Oct 2010 | - | Open | Director |
| uk power networks (operations) limited | £1.4b | £3.1b | Oct 2010 | - | Open | Director |
| cki number 3 limited | - | £2.6b | May 2011 | - | Open | Director |
| uk power networks services holdings limited | £204m | £1.8b | Nov 2010 | - | Open | Director |
| uk power networks services (south east) limited | £1m | £893.5m | Oct 2010 | - | Open | Director |
| uk power networks services (contracting) limited | £94.3m | £614.9m | Oct 2010 | - | Open | Director |
| uk power networks services (commercial) limited | £69.1m | £170.1m | Oct 2010 | - | Open | Director |
| uk power networks services (asset management) limited | - | £127.8m | Oct 2010 | - | Open | Director |
| uk power networks (transport) limited | £41.2m | £87.7m | Oct 2010 | - | Open | Director |
| uk power networks services (enterprises) limited | - | £71.2m | Oct 2010 | - | Open | Director |
| powerlink renewable assets limited | £9.2m | £58.5m | May 2024 | - | Open | Director |
| uk power networks (south east services) limited | £35.9m | £29.4m | Oct 2010 | - | Open | Director |
| uk power networks services (powerlink holdings) limited | - | £6.5m | Oct 2010 | - | Open | Director |
| uk power networks (distribution system operator) limited | - | £262.8 | Jan 2023 | - | Open | Director |
| energy infrastructure networks limited | - | £5.3 | Nov 2022 | - | Open | Director |
| uk power networks (idno finance) limited | - | £3.8 | Oct 2010 | - | Open | Director |
| uk power networks (idno) limited | - | £2.6 | Oct 2010 | - | Open | Director |
| lea valley utilities limited | - | £2.2 | Oct 2010 | - | Open | Director |
| cki spark holdings no. two limited | - | - | Feb 2024 | - | Open | Director |
