Holding(s) in Company

Pennon Group PLC 28 January 2008 PENNON GROUP PLC FOR IMMEDIATE RELEASE HOLDING IN COMPANY NOTIFICATION OF MAJOR INTERESTS IN SHARES 1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii): PENNON GROUP PLC 2. Reason for the notification An acquisition or disposal of voting rights 3. Full name of person(s) subject to the notification obligation Legal & General Group Plc (L&G) 4. Full name of shareholder(s) Legal & General Assurance (Pensions Management) Limited (PMC) 5. Date of the transaction (and date on which the threshold is crossed or reached if different) 23 January 2008 6. Date on which issuer notified: 24 January 2008 7. Threshold(s) that is/are crossed or reached: From 4% - 5% (L&G) 8. Notified details: A: Voting rights attached to shares Class/type of shares if possible Situation previous to the Triggering transaction using the ISIN CODE Number of shares Number of voting Rights ORD GBP 0.407 16,743,368 16,743,368 Resulting situation after the triggering transaction Class/type of shares if Number of shares Number of voting rights (ix) % of voting rights possible using the ISIN CODE Direct Direct (x) Indirect (xi) Direct Indirect ORD GBP 0.407 17,656,811 17,656,811 5.06% B: Financial Instruments Resulting situation after the triggering transaction Type of Expiration Date Exercise/Conversion Number of voting rights % of voting rights financial (xiii) Period/ Date that may be acquired if the instrument instrument is exercised/ converted. Total (A+B) Number of voting rights % of voting rights 17,656,811 5.06% 9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable Legal & General Group Plc (Direct and Indirect) (Group) (20,139,820 - 5.77% = Total Position) Legal & General Investment Management (Holdings) Limited (LGIMH) (Direct and Indirect) (20,139,820 - 5.77% = Total Position) Legal & General Investment Management Limited (Indirect) (LGIM) (20,139,820 - 5.77% = Total Position) Legal & General Group Plc (Direct) (L&G) (17,656,811 - 5.06% = LGAS, LGPL & PMC) Legal & General Investment Management (Holdings) Limited (Direct) (LGIMHD) (13,318,713 - 3.81% = PMC) Legal & General Insurance Holdings Limited (Direct) (LGIH) Legal & General Assurance (Pensions Management) Limited (PMC) Legal & General Assurance Society (13,318,713 - 3.81% = PMC) Limited (LGAS & LGPL) Legal & General Pensions Limited (Direct) (LGPL) Proxy Voting: 10. Name of the proxy holder: N/A 11. Number of voting rights proxy holder will cease to hold: N/A 12. Date on which proxy holder will cease to hold voting rights: N/A 13. Additional information: Notification using the total voting rights figure of 348,701,727. Annex to Notification of Major Interests In Shares A: Identity of the person or legal entity subject to the notification obligation Full name (including legal form for legal entities): Pennon Group Plc Contact address (registered office for legal entities): Peninsula House, Rydon Lane, Exeter, Devon, EX2 7HR Contact name Christopher Paul Richards - Interim Assistant Company Secretary Phone number 01392 443060 28 January 2008 www.pennon-group.co.uk End transmission This information is provided by RNS The company news service from the London Stock Exchange

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Pennon Group (PNN)
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