Website & contact details
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- The site of this company’s group or brand.
Sizewell C (Holding) Limited
- Incorporated
- 28 October 2014 (12 years)
- Previously known as
- NNB Holding Company (SZC) Ltd (until 12 June 2023)NNB Company (SZC) Ltd (until 16 December 2014)
- Industry
- Activities of other holding companies n.e.c. (64209)
- Directors
- Owned by
- Secretary of State for Energy Security and Net Zero
- Accounts type
- Group
- Region
- Greater London
- Address
- 25 Copthall AvenueLondonEC2R 7BP
Filing status
- Accounts due
- 31 December 2027
- Last accounts
- 31 March 2026
- Conf. stmt due
- 1 June 2027
- Last conf. stmt
- 18 May 2026
Charges
- Total
- 2
- Outstanding
- 2
- Part satisfied
- 0
- Satisfied
- 0
Officers 9 active
Officer details are public data from the Companies House register.
British
Born June 1971 (55)
Director · Appointed 4 November 2025
Also at Sizewell C (Pledgeco) Limited
French
Born March 1980 (46)
Director · Appointed 4 November 2025
French
Born March 1974 (52)
Director · Appointed 4 November 2025
Irish
Born September 1971 (55)
Lopez Delgado, Alejandro
Director · Appointed 4 November 2025
Spanish,British
Born November 1977
British
Born March 1965 (61)
Magnus, Asha
Secretary · Appointed 25 June 2024
Director · Appointed 1 December 2022
British
Born December 1966 (59)
Director · Appointed 29 November 2022
British
Born February 1965 (61)
Officer history (24 former)
28 April 2026
23 November 2025
4 November 2025
4 November 2025
4 November 2025
4 November 2025
Appointed Lopez Delgado, Alejandro as Director
1 May 2025
1 March 2025
1 March 2025
25 June 2024
Appointed Magnus, Asha as Secretary
25 June 2024
Resigned Pokorny, Abbie as Secretary
23 May 2024
13 December 2023
16 May 2023
16 May 2023
1 December 2022
1 December 2022
1 December 2022
1 December 2022
1 December 2022
29 November 2022
29 November 2022
Appointed Pokorny, Abbie as Secretary
29 November 2022
29 November 2022
29 November 2022
29 November 2022
Resigned Gooding, Claire Rachel as Secretary
29 November 2022
30 June 2022
10 March 2022
10 March 2022
10 May 2021
10 May 2021
14 January 2021
14 January 2021
18 June 2019
4 April 2019
3 April 2019
1 April 2019
Appointed Gooding, Claire Rachel as Secretary
31 March 2019
Resigned Santi, Guido as Secretary
31 March 2019
1 November 2017
31 October 2017
29 November 2016
Appointed Santi, Guido as Secretary
29 November 2016
Resigned Hamill, Christopher Hugh as Secretary
30 September 2016
30 September 2016
30 September 2016
30 September 2016
30 September 2016
17 November 2014
17 November 2014
17 November 2014
17 November 2014
Appointed Hamill, Christopher Hugh as Secretary
17 November 2014
17 November 2014
Resigned Peregrine Secretarial Services Ltd as Corporate Director
28 October 2014
28 October 2014
Appointed Peregrine Secretarial Services Ltd as Corporate Director
Ownership 1 active
People and entities with significant control, from the Companies House PSC register
Secretary of State for Energy Security and Net Zero
Legal person · Notified 1 December 2022
Owns 25–50% of shares
Holds 25–50% of voting rights
Corporation Sole
Former controllers (1)
4 November 2025
Ceased Edf Energy Holdings Limited — Has significant influence or control
Group structure 4 companies
Ownership group derived from the Companies House PSC register
Sizewell C (Holding) Limited This company
Sizewell C (Pledgeco) Limited Owns 75–100% of shares
Sizewell C Limited Has significant influence or control
Nuclear Services (Technical) Company Limited Owns 25–50% of shares
Filings 186
| Date | Description | Made Up To | Pages | |
|---|---|---|---|---|
| 15 October 2026 | Notification of a person with significant control | |||
| 6 October 2026 | Statement of capital following an allotment of shares | |||
| 17 July 2026 | Group of companies' accounts | 31 March 2026 | ||
| 1 June 2026 | Confirmation statement with updates | 18 May 2026 | ||
| 12 May 2026 | Appointment of a director |
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