Holding(s) in Company

Pennon Group PLC
13 July 2006

PENNON GROUP PLC

FOR IMMEDIATE RELEASE

HOLDING IN COMPANY

Pennon Group Plc has received notification (by fax dated 12 July 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 14,282,795 Ordinary Shares of 1221/10p each in the Company.



13 July 2006

www.pennon-group.co.uk

End transmission



                      This information is provided by RNS
            The company news service from the London Stock Exchange