| Alvaro Martinez Palacio | Director | 4 Nov 2021 | 28 Mar 2025 | Spanish | 53 years |
| Andrew Philip | Secretary | 1 Sept 2014 | 2 Apr 2025 | - | - |
| Charles Edward Joseph Langan | Director | 2 Dec 2019 | 20 Mar 2025 | British | 48 years |
| David Lewis Wark | Director | 2 Dec 2019 | 31 Jul 2021 | British | 63 years |
| David Mesonero Molina | Director | 23 Jun 2020 | 12 Jul 2021 | Spanish | 46 years |
| David Michael Rowland | Director | 31 Oct 2007 | 31 Jan 2008 | British | 64 years |
| Denise Mary Holt | Director | 25 Mar 2011 | 4 May 2012 | British | 77 years |
| Emilio Hernandez | Secretary | 7 Jul 2010 | 2 Apr 2012 | British | - |
| Iberdrola S.a | Corporate Director | 21 Jun 2007 | 31 Oct 2007 | - | - |
| Javier Garcia De Fuentes | Director | 30 May 2012 | 2 Dec 2019 | Spanish | 61 years |
| Jonathan Thomas Kirkwood Cole | Director | 31 Jan 2008 | 16 Jul 2009 | British | 49 years |
| Jonathan Thomas Kirkwood Cole | Secretary | 6 Oct 2008 | 7 Jul 2010 | British | - |
| Jonathan Thomas Kirkwood Cole | Director | 30 May 2012 | 4 Oct 2021 | British | 49 years |
| Jose Angel Marra Rodriguez | Director | 16 Jul 2009 | 3 Dec 2011 | Spanish | 60 years |
| Keith Stuart Anderson | Director | 31 Oct 2007 | 2 May 2018 | British | 62 years |
| Lena Cooper Wilson | Director | 29 Nov 2017 | 30 Apr 2021 | British | 62 years |
| Lindsay Ann Mcquade | Director | 17 Jul 2018 | 10 Jun 2022 | British | 50 years |
| Marion Shepherd Venman | Director | 2 Dec 2019 | 28 Mar 2025 | British | 58 years |
| Marion Venman | Secretary | 26 Oct 2007 | 6 Oct 2008 | British | - |
| Nicola Mary Connelly | Director | 21 Sept 2021 | 18 Jun 2024 | British | 56 years |
| Pablo Canales Abaitua | Director | 1 Sept 2010 | 27 Oct 2014 | Spanish | 57 years |
| Rafael De Icaza De La Sota | Director | 16 Jul 2009 | 1 Sept 2010 | Spanish | 65 years |
| Rafael De Icaza De La Sota | Director | 26 Oct 2017 | 2 Dec 2019 | Spanish | 65 years |
| Regina Reyes Gallur | Director | 16 Jul 2009 | 29 May 2012 | Spanish | 60 years |
| Roy Scott | Director | 29 Aug 2008 | 16 Jul 2009 | British | 62 years |
| Seumus O'gorman | Secretary | 2 Apr 2012 | 1 Sept 2014 | British | - |
| Sheelagh Jane Duffield | Secretary | 21 Jun 2007 | 26 Oct 2007 | British | - |
| Susan Catherine Deacon | Director | 16 Jul 2009 | 30 May 2012 | British | 62 years |
| Unai Astiz | Director | 27 Oct 2014 | 26 Oct 2017 | Spanish | 53 years |
| Xabier Viteri | Director | 30 May 2012 | 28 May 2025 | Spanish | 66 years |