Holding(s) in Company

Scottish & Southern Energy PLC 16 March 2006 Scottish and Southern Energy plc Holding (s) in Company 16 March 2006 NOTIFICATION UNDER SECTION 198 TO 202 OF THE COMPANIES ACT 1985 The Company was notified on 15 March 2006 that The Capital Group Companies, Inc, through various legal entities as listed below, has a notifiable interest in 34,462,226 ordinary 50p shares in Scottish and Southern Energy plc, being 4.01% of the issued share capital of the company. Legal Entity Capital Guardian Trust Company 15,742,334 Capital International Limited 13,378,317 Capital International S.A. 1,976,600 Capital International, Inc 964,975 Capital Research and Management Company 2,400,000 Registered Holder State Street Nominees Limited 1,704,568 Bank of New York Nominees 1,095,600 Northern Trust 119,400 Chase Manhattan Bank Australia Limited 5,300 Chase Nominees Limited 7,403,869 BT Globenet Nominees Ltd 329,600 Midland Bank plc 1,447,200 Cede & Co 55,500 Deutsche Bank Mannheim 1,300 Bankers Trust 601,200 Barclays Bank 13,500 Brown Bros. 81,540 Nortrust Nominees 1,825,550 Royal Bank of Scotland 42,100 MSS Nominees Limited 35,600 State Street Bank & Trust Co. 53,300 RBSTB Nominees Ltd 3,000 Citibank NA Toronto 22,100 Deutsche Bank AG 2,600 Mellon Bank N.A. 67,000 Roy Nominees Limited 15,600 Mellon Nominees (UK) Limited 334,000 HSBC 19,500 JP Morgan Chase Bank 463,407 State Street Nominees Limited 135,500 Bank of New York Nominees 2,794,333 Northern Trust 1,435,155 Chase Nominees Limited 2,886,400 Midland Bank plc 82,900 Bankers Trust 82,100 Barclays Bank 37,100 Citibank London 443,800 Morgan Guaranty 236,200 Nortrust Nominees 1,860,700 Royal Bank of Scotland 628,700 MSS Nominees Limited 34,100 State Street Bank & Trust Co. 365,329 National Westminster Bank 79,000 Lloyds Bank 25,600 Citibank NA Toronto 21,100 Deutsche Bank AG 902,000 Chase Manhattan Nominee Ltd 54,100 HSBC Bank plc 860,400 Mellon Bank N.A. 122,000 KAS UK 70,500 Bank One London 147,300 Clydesdale Bank plc 51,100 HSBC 9,400 JP Morgan Chase Bank 13,500 State Street Nominees Limited 14,200 Bank of New York Nominees 9,500 Chase Nominees Limited 431,000 Credit Suisse London Branch 18,900 Midlands Bank plc 65,400 Barclays Bank 13,000 Pictet & Cie, Geneva 10,000 Nortrust Nominees 9,900 Morgan Stanley 11,600 Royal Bank of Scotland 151,500 J.P. Morgan 870,500 National Westminster Bank 15,000 Lloyds Bank 24,100 RBSTB Nominees Ltd 60,400 Deutsche Bank AG 36,300 HSBC Bank plc 235,300 State Street Nominees Limited 305,800 Bank of New York Nominees 96,275 Northern Trust 5,500 Chase Nominees Limited 316,100 Midland Bank plc 6,900 Bankers Trust 15,000 Nortrust Nominees 92,500 State Street Bank & Trust Co. 19,200 Citibank 3,100 Citibank NA Toronto 48,100 HSBC Bank plc 42,500 JP Morgan Chase Bank 14,000 Chase Nominees Limited 2,400,000 This information is provided by RNS The company news service from the London Stock Exchange

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