Holding(s) in Company

Pennon Group PLC
11 August 2006

PENNON GROUP PLC



FOR IMMEDIATE RELEASE



HOLDING IN COMPANY







Pennon Group Plc has received notification (by fax dated 10 August 2006) that
Ameriprise Financial Inc and its group, of which Threadneedle Asset Management
Holdings Limited is the ultimate intermediate holding company in the UK, holds
an interest in 46,344,528 Ordinary shares of 40.7p each in the Company.









11 August 2006





www.pennon-group.co.uk





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