Holding(s) in Company

Scottish & Southern Energy PLC 23 January 2006 Scottish and Southern Energy plc Holding(s) in Company 23 January 2006 NOTIFICATION UNDER SECTION 198 TO 202 OF THE COMPANIES ACT 1985 The Company was notified on 20 January 2006 that Barclays plc, through various legal entities as listed below, has a notifiable interest in 34,139,136 ordinary 50p shares in Scottish and Southern Energy plc, being 3.97% of the issued share capital of the company. Legal Entity Barclays Global Investors Japan Trust & Banking 1,004,540 Barclays Global Fund Advisors 2,253,377 Barclays Life Assurance Co Ltd 1,750,632 Barclays Global Investors Canada Ltd 46,638 Barclays Bank Trust Company Ltd 36,174 Barclays Private Bank and Trust Ltd 1,302 Barclays Global Investors Japan Ltd 180,821 Gerrard Ltd 4,553,548 Barclays Capital Securities Ltd 367,991 Barclays Private Bank and Trust Ltd 13,378 Barclays Global Investors Ltd 15,605,696 Barclays Global Investors, N.A. 8,027,832 Barclays Global Investors Australia Ltd 297,207 Group Holding 34,139,136 Registered Holder Bank of Ireland 71,487 Bank of Ireland 10,887 Bank of New York 60,622 Barclays Capital Nominees Limited -14,242 Barclays Capital Nominees Limited 123,577 Barclays Capital Nominees Limited -36,462 Barclays Capital Nominees Limited 304,718 Barclays Capital Securities Ltd -9,600 Barclays Capital Securities Ltd -9,600 Barclays Capital Securities Ltd 9,600 Barclays Global Investors Canada 46,638 Barclays Trust Co & Others 5,065 Barclays Trust Co AS EXEC/ADM 95 Barclays Trust Co DMC69 13,400 Barclays Trust Co E99 2,478 Barclays Trust Co R69 15,136 BNP Paribas 17,532 Chase Nominees Ltd 463,676 Chase Nominees Ltd 5,373,159 Chase Nominees Ltd 212,631 Chase Nominees Ltd 270,096 Chase Nominees Ltd 108,637 CIBC Mellon Global Securities 11,616 Clydesdale Nominees HGB0125 1,270 Clydesdale Nominees HGB0125 4,230 Clydesdale Nominees HGB0125 6,660 Clydesdale Nominees HGB0225 1,218 Gerrard Nominees Limited 360 Gerrard Nominees Limited 750 Gerrard Nominees Limited 400 Gerrard Nominees Limited 500 Gerrard Nominees Limited 780 Gerrard Nominees Limited 1,500 Gerrard Nominees Limited 1,750 Gerrard Nominees Limited 450 Gerrard Nominees Limited 2,700 Gerrard Nominees Limited 1,250 Gerrard Nominees Limited 1,100 Gerrard Nominees Limited 1,250 Gerrard Nominees Limited 550 Gerrard Nominees Limited 1,500 Gerrard Nominees Limited 2,700 Gerrard Nominees Limited 1,500 Gerrard Nominees Limited 250 Gerrard Nominees Limited 1,000 Gerrard Nominees Limited 450 Gerrard Nominees Limited 200 Greig Middleton Nominees Limited (GM1) 405,370 Greig Middleton Nominees Ltd (GM3) 60,000 Greig Middleton Nominees (GM3) 150,000 Investors Bank and Trust Co 780 Investors Bank and Trust Co 454 Investors Bank and Trust Co 325,376 Investors Bank and Trust Co 245,137 Investors Bank and Trust Co 19,624 Investors Bank and Trust Co 589,116 Investors Bank and Trust Co 238,806 Investors Bank and Trust Co 4,393,706 Investors Bank and Trust Co 919,931 Investors Bank and Trust Co 19,030 Investors Bank and Trust Co 49,011 Investors Bank and Trust Co 7,584 Investors Bank and Trust Co 87,120 Investors Bank and Trust Co 8,549 Investors Bank and Trust Co 155,138 Investors Bank and Trust Co 166,212 Investors Bank and Trust Co 1,878,888 Investors Bank and Trust Co 183,464 Investors Bank and Trust Co 24,813 JP Morgan (BGI Custody) 237,025 JP Morgan (BGI Custody) 50,738 JP Morgan (BGI Custody) 244,667 JP Morgan (BGI Custody) 486,092 JP Morgan (BGI Custody) 108,225 JP Morgan (BGI Custody) 82,197 JP Morgan (BGI Custody) 148,239 JP Morgan (BGI Custody) 8,795,433 JP Morgan (BGI Custody) 14,716 JP Morgan (BGI Custody) 678,423 JPMorgan Chase Bank 122,300 JPMorgan Chase Bank 2,227 JPMorgan Chase Bank 43,618 JPMorgan Chase Bank 104,798 JPMorgan Chase Bank 8,213 JPMorgan Chase Bank 7,168 JPMorgan Chase Bank 13,532 JPMorgan Chase Bank 92,627 JPMorgan Chase Bank 116,125 JPMorgan Chase Bank 5,525 JPMorgan Chase Bank 464,807 JPMorgan Chase Bank 23,600 JPMorgan Chase Bank 215,803 JPMorgan Chase Bank 81,404 JPMorgan Chase Bank 8,773 JPMorgan Chase Bank 36,388 JPMorgan Chase Bank 15,420 JPMorgan Chase Bank 54,648 JPMorgan Chase Bank 5,489 JPMorgan Chase Bank 24,589 JPMorgan Chase Bank 27,317 Master Trust Bank 10,015 Mellon Trust - US Custodian 28,323 Mellon Trust - US Custodian 66,620 Mellon Trust of New England 33,635 Mitsubishi Trust International 4,131 Mitsui Asset 10,814 Northern Trust Bank - BGI SEPA 9,720 Northern Trust Bank - BGI SEPA 44,014 Northern Trust Bank - BGI SEPA 37,653 R C Greig Nominees Limited 2,590,616 R C Greig Nominees Limited a/c AK1 667,529 R C Greig Nominees Limited a/c BL1 130,487 R C Greig Nominees Limited a/c CM1 69,167 R C Greig Nominees Limited GP1 318,226 R C Greig Nominees Limited SA1 141,213 Reflex Nominees Limited 852 Reflex Nominees Limited 450 State Street Bank & Trust - WI 119,131 State Street Boston 480,117 State Street Trust of Canada 13,201 Sumitomo TB 2,251 The Northern Trust Company - U 18,969 Trust & Custody Services Bank 8,303 Total 34,139,136 This information is provided by RNS The company news service from the London Stock Exchange HOLUOSSRNKRAUAR

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