Website & contact details
- Website
- Group website
- The site of this company’s group or brand.
National Energy System Operator Limited
- Incorporated
- 16 October 2017 (9 years)
- Previously known as
- National Grid Electricity System Operator Limited (until 1 October 2024)
- Industry
- Other service activities n.e.c. (96090)
- Directors
- Emma Fitzgerald
- Owned by
- The Secretary of State for Energy Security and Net Zero
- Accounts type
- Full
- Region
- South East
- Address
- St Catherine's Lodge Bearwood RoadSindleshamWokinghamRG41 5BN
Filing status
- Accounts due
- 31 December 2026
- Last accounts
- 31 March 2025
- Conf. stmt due
- 3 November 2027
- Last conf. stmt
- 20 October 2026
Officers 13 active
Officer details are public data from the Companies House register.
Scottish
Born May 1961 (65)
Fitzgerald, Emma, Dr
Director · Appointed 1 October 2025
British
Born January 1967 (59)
Director · Appointed 1 July 2025
British
Born December 1958 (67)
Director · Appointed 3 February 2025
British
Born September 1963 (63)
Duffy, Clare Siobhan
Director · Appointed 1 October 2024
Irish
Born October 1966 (60)
Director · Appointed 1 October 2024
Also at The Era Foundation Limited · more companies
British
Born February 1951 (75)
British
Born October 1977 (49)
Favier-Tilston, Claire
Secretary · Appointed 11 May 2021
Director · Appointed 16 June 2020
British
Born August 1962 (64)
Morrissey, Zoe Elise
Secretary · Appointed 23 May 2019
Legge, Kayte Anne Eve
Director · Appointed 1 April 2019
British
Born December 1979 (46)
Director · Appointed 1 April 2019
British
Born May 1973 (53)
Director · Appointed 1 March 2019
Irish
Born March 1970 (56)
Officer history (15 former)
30 June 2026
1 April 2026
1 October 2025
Appointed Fitzgerald, Emma, Dr as Director
1 July 2025
31 March 2025
3 February 2025
1 October 2024
1 October 2024
Appointed Duffy, Clare Siobhan as Director
1 October 2024
10 July 2024
11 September 2023
17 July 2023
31 December 2022
Resigned Moran, Regina as Director
15 November 2022
14 November 2022
11 May 2021
Appointed Favier-Tilston, Claire as Secretary
30 November 2020
1 August 2020
Appointed Moran, Regina as Director
16 June 2020
4 May 2020
4 May 2020
Resigned Tuckman, Claire Louise as Director
9 March 2020
17 February 2020
Resigned Burt, Duncan Bryden as Director
4 October 2019
Resigned Ackon, Chantal Marise as Secretary
23 May 2019
Appointed Morrissey, Zoe Elise as Secretary
1 April 2019
1 April 2019
1 April 2019
Appointed Tuckman, Claire Louise as Director
1 April 2019
Appointed Ackon, Chantal Marise as Secretary
1 April 2019
1 April 2019
Appointed Legge, Kayte Anne Eve as Director
1 April 2019
1 April 2019
1 April 2019
Resigned Hagan, Lawrence as Secretary
1 April 2019
Appointed Burt, Duncan Bryden as Director
1 March 2019
30 November 2018
30 November 2018
8 January 2018
8 January 2018
16 October 2017
16 October 2017
Appointed Hagan, Lawrence as Secretary
16 October 2017
Ownership 1 active
People and entities with significant control, from the Companies House PSC register
The Secretary of State for Energy Security and Net Zero
Legal person · Notified 1 October 2024
Owns 75–100% of shares
Holds 75–100% of voting rights
Right to appoint and remove directors
Corporation Sole
Former controllers (1)
1 October 2024
Ceased National Grid Holdings One PLC — Owns 75–100% of shares
What National Energy System Operator say about themselves
“We operate today's electricity system and design tomorrow's energy system.”
Filings 90
| Date | Description | Made Up To | Pages | |
|---|---|---|---|---|
| 20 October 2026 | Confirmation statement with updates | 20 October 2026 | ||
| 29 September 2026 | Termination of appointment of a director | |||
| 23 April 2026 | Confirmation statement with updates | 23 April 2026 | ||
| 3 April 2026 | Appointment of a director | |||
| 9 March 2026 | Director's details changed |
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