Transaction in Own Shares

Pennon Group PLC
24 August 2007

Pennon Group Plc announces that it has today purchased through Credit Suisse
(Securities) Europe Limited 150,000 ordinary shares at a price of 560.75 pence
per share.

The purchased shares will all be held in treasury.  Following the above purchase
and non-cancellation of such equity shares, Pennon Group Plc will hold 4,952,263
ordinary shares in treasury and a total of 350,212,011 ordinary shares will be
in issue (excluding shares to be held in treasury).


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