Holding(s) in Company

Pennon Group PLC
20 December 2006


PENNON GROUP PLC


FOR IMMEDIATE RELEASE


HOLDING IN COMPANY


Pennon Group Plc received notification yesterday (by fax dated 19 December 2006)
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 44,803,279 Ordinary shares of 40.7p each in the Company.








20 December 2006


www.pennon-group.co.uk


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