Holding(s) in Company

Pennon Group PLC
22 February 2007

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

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 (iii):

Prudential plc group of companies



4. Full name of shareholder(s) (if different from 3)



5. Date of the transaction (and date on which the threshold is crossed or
reached if different)



16 February 2007



6. Date on which issuer notified:



21 February 2007



7. Threshold(s) that is/are crossed or reached:



5%



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
Ordinary
                                  17,816,776
GB00B18V8630                                                         17,816,776








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

                                                                               -        Below 5%         -
                             Below 5%
 GB00B18V8630                                         Below 5%




B: Financial Instruments

Resulting situation after the triggering transaction (xii)


Type of         Expiration Date       Exercise/Conversion       Number of voting rights     % of voting rights
financial       (xiii)                Period/ Date (xiv)        that may be acquired if the
instrument                                                      instrument is exercised/
                                                                converted.


N/A             N/A                   N/A                       N/A                         N/A



Total (A+B)
Number of voting rights        % of voting rights

Below 5%                       Below 5%



9. Chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held, if applicable :



Prudential plc (parent company)

M&G Group Limited (wholly owned subsidiary of Prudential plc)

M&G Limited (wholly owned subsidiary of M&G Group Limited)



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:



       All holdings are exempt from disclosure as now below 5%









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   Margaret Lilian Heeley - Assistant Company Secretary



 Phone number 01392 443060





22 February 2007



www.pennon-group.co.uk



End transmission


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