Publication of Prospectus

NORTHERN POWERGRID (YORKSHIRE) PLC

PUBLICATION OF PROSPECTUS

The following Prospectus has been approved by the UK Listing Authority and is available for viewing:

Prospectus for the £150,000,000 4.375 per cent. Bonds due 2032 of Northern Powergrid (Yorkshire) plc., dated 2 July 2012.

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

http://www.rns-pdf.londonstockexchange.com/rns/7020G_-2012-7-2.pdf

A copy of the above Prospectus has also been submitted to the National Storage Mechanism and will shortly be available for inspection at: www.hemscott.com/nsm.do

For further information, please contact

Tom Fielden

Tel: +44 191 223 5120

Fax: +44 191 223 5142

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 one of the intended addressees of the information contained therein.

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