Publication of Prospectus

20 September 2017

PENNON GROUP PLC

Publication of Prospectus

The following prospectus dated 20 September 2017 (the Prospectus) has been approved by the UK Listing Authority and is available for viewing:

Pennon Group plcIssue of £300,000,000 Perpetual Capital Securities

To view the full document, please paste the following URL into the address bar of your browser.

http://www.rns-pdf.londonstockexchange.com/rns/3369R_-2017-9-20.pdf

A copy of the Prospectus has also been submitted to the National Storage Mechanism and will shortly be available for inspection at: http://www.morningstar.co.uk/uk/NSM.

For further information, please contact:

Paul BooteGroup Financial ControllerPennon Group plcPeninsula HouseRydon LaneExeter EX2 7HR

Telephone: 01392 443267

Fax: 01392 422046

DISCLAIMER ‑ INTENDED ADDRESSEES

Please note that the information contained in the Prospectus may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Prospectus) only and is not intended for use and should not be relied upon by any person outside these countries and/or to whom the offer contained in the prospectus is not addressed. Prior to relying on the information contained in the Prospectus you must ascertain from the Prospectus whether or not you are part of the intended addressees of the information contained therein.

Your right to access this service is conditional upon complying with the above requirement.