| Alain Jean-marie Planchot | Director | 1 Feb 1993 | 8 Mar 1996 | French | 73 years |
| Andrew Philip Poole | Secretary | 7 May 1997 | 18 Dec 1998 | British | - |
| Ann Geraldine Dunleavy | Secretary | 30 Sept 1993 | 26 Apr 1996 | British | - |
| Anne Garrihy | Secretary | 26 Apr 1996 | 17 Feb 1997 | British | - |
| Anthony David Cocker | Director | 31 Mar 2004 | 4 Jul 2007 | British | 67 years |
| Barbara Scott Macaulay | Secretary | 26 Apr 1996 | 17 Jan 1997 | British | - |
| Bernd Wagner | Director | 8 Dec 2017 | 31 Oct 2018 | German | 60 years |
| Brian Maurice Huggett | Director | 23 Jun 1994 | 18 Aug 1995 | British | 88 years |
| Brian Norman Dickie | Director | 15 Oct 2002 | 21 Oct 2002 | British | 71 years |
| Charles Jeremie Maillard | Director | 1 Feb 1993 | 8 Mar 1996 | French | 92 years |
| Christopher James Lovatt | Director | 18 Sept 2020 | 31 Jan 2025 | British | 57 years |
| Colin Macmillan | Director | 1 Feb 1993 | 19 Oct 1995 | British | 77 years |
| Colin Michael Shoesmith | Director | 16 Dec 1998 | 18 Dec 1998 | British | 69 years |
| Colin Roger Scoins | Director | 1 Jan 2008 | 17 May 2010 | British | 71 years |
| David John Morgans | Director | 1 Jan 2008 | 7 Jan 2013 | British | 56 years |
| David Wilkinson | Director | 18 Aug 1995 | 4 Dec 1997 | British | 73 years |
| Donald Leiper | Director | 7 Jan 2013 | 28 Jan 2016 | British | 62 years |
| E.on Uk Secretaries Limited | Corporate Secretary | 7 Jan 2013 | 26 Sept 2022 | United Kingdom | - |
| Edward Barnard Hyams | Director | 18 Dec 1998 | 30 Sept 2000 | British | 75 years |
| Fiona Scott Stark | Director | 21 Oct 2002 | 7 Apr 2003 | British | 64 years |
| Fiona Scott Stark | Director | 21 Aug 2014 | 22 Aug 2016 | British | 64 years |
| Graham John Bartlett | Director | 21 Oct 2002 | 4 Jul 2007 | British | 70 years |
| Henri Trape | Director | 1 Feb 1993 | 27 May 1993 | French | 75 years |
| Ian Peter Fairclough | Secretary | 7 Apr 2003 | 13 Jul 2012 | British | - |
| James Timothy Lightfoot | Director | 17 May 2010 | 7 Jan 2013 | British | 60 years |
| James Timothy Lightfoot | Director | 28 Jan 2016 | 8 Dec 2017 | British | 60 years |
| Jeremy Peter Bungey | Director | 22 Aug 2016 | 8 Dec 2017 | British | 55 years |
| John Anthony Ireton | Director | 22 Aug 2016 | 23 Mar 2018 | British | 57 years |
| John Charles Earl | Director | 18 Aug 1995 | 18 Dec 1998 | British | 79 years |
| Keith Plowman | Director | 7 Apr 2003 | 1 Jan 2008 | British | 68 years |
| Marc Reid | Director | 16 Dec 1998 | 18 Dec 1998 | British | 61 years |
| Maria Bernadette Jones | Secretary | 1 Feb 1993 | 30 Sept 1993 | British | - |
| Mark Robert Draper | Director | 7 Apr 2003 | 31 Mar 2004 | British | 63 years |
| Mark Sydney Clare | Director | 27 Oct 1994 | 12 Sept 1996 | British | 69 years |
| Martin Stephen William Stanley | Director | 15 Oct 2002 | 21 Oct 2002 | British | 63 years |
| Melvyn Hill | Director | 2 Dec 1996 | 18 Dec 1998 | British | 80 years |
| Michael James Mcnally | Director | 15 Oct 2002 | 21 Oct 2002 | American | 72 years |
| Michael Robert Day | Director | 4 Apr 2018 | 29 Nov 2019 | British | 48 years |
| Michael Robert French | Director | 1 Nov 2018 | 18 Sept 2020 | German | 58 years |
| Neil Moore | Director | 2 Dec 1996 | 18 Dec 1998 | British | 63 years |
| Paul Ashton | Director | 10 Nov 2000 | 31 Jan 2002 | British | 72 years |
| Paul Colin Marsh | Director | 18 Dec 1998 | 21 Oct 2002 | British | 68 years |
| Paul Golby | Director | 21 Oct 2002 | 7 Apr 2003 | British | 75 years |
| Peter Jeremy Bridgewater | Director | 4 Jul 2007 | 1 Jan 2008 | British | 63 years |
| Peter John Tottman | Director | 18 Dec 1998 | 17 Oct 2002 | British | 76 years |
| Philip Arthur Ellis | Secretary | 18 Dec 1998 | 30 Jun 2000 | British | - |
| Philip Raymond Taylor | Director | 18 Aug 1995 | 6 May 1997 | British | 80 years |
| Philippe Tordeux | Director | 1 Feb 1993 | 8 Mar 1996 | French | 67 years |
| Pierre-charles Bono | Director | 27 May 1993 | 8 Mar 1996 | French | 78 years |
| Powergen Directors Limited | Corporate Director | 21 Oct 2002 | 7 Apr 2003 | - | - |
| Powergen Secretaries Limited | Corporate Secretary | 21 Oct 2002 | 7 Apr 2003 | - | - |
| René Matthies | Director | 7 Jan 2013 | 31 May 2016 | German | 56 years |
| Richard Charles Hindson | Director | 1 Feb 1993 | 23 Jun 1994 | British | 67 years |
| Richard James Pennells | Director | 7 Jan 2013 | 27 Jan 2014 | British | 62 years |
| Robert Allred Wooldridge | Director | 15 Oct 2002 | 21 Oct 2002 | American | 88 years |
| Robert Frazer | Director | 1 Feb 1993 | 23 Jun 1994 | British | 84 years |
| Robert James Brown | Director | 1 Feb 1993 | 18 Aug 1995 | British | 86 years |
| Robert Taylor | Director | 4 Jul 2007 | 1 Oct 2008 | British | 65 years |
| Roger William Muchmore | Director | 27 May 1993 | 18 Aug 1995 | British | 86 years |
| Russell Andrew Strothers | Director | 29 Nov 2019 | 19 Mar 2020 | British | 40 years |
| Sandra Scott | Secretary | 1 Feb 1993 | 30 Sept 1993 | British | - |
| Shaun Kevin Bryant | Secretary | 30 Jun 2000 | 21 Oct 2002 | British | - |
| Stuart Piers Chandler | Director | 30 Apr 1998 | 18 Dec 1998 | English | 71 years |