Holding(s) in Company

Pennon Group PLC
23 July 2007

PENNON GROUP PLC



FOR IMMEDIATE RELEASE



HOLDING IN COMPANY



Pennon Group Plc received notification on 20 July 2007 (by fax dated 20 July
2007) that Ameriprise Financial, Inc and its Group, of which Threadneedle Asset
Management Holdings Limited is the ultimate intermediate holding company in the
UK, hold an interest in 35,301,271 Ordinary shares of 40.7p each in the Company.








23 July 2007





www.pennon-group.co.uk





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