Publication of Prospectus

14 March 2013



National Grid plc

Publication of Prospectus

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

Prospectus dated 14 March 2013 in relation to NGG Finance plc's €1,250,000,000 Fixed Rate Resettable Capital Securities due 2076 and its £1,000,000,000 Fixed Rate Resettable Capital Securities due 2073, each unconditionally and irrevocably guaranteed by National Grid plc

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

For further information, please contact:

Kwok Liu

Head of Capital Markets, TreasuryNational Grid, 1-3 Strand, London. WC2N 5EHTel: +44 (0) 20 7004 3367

IMPORTANT INFORMATION

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.

The securities referred to in the Prospectus have not been and will not be registered under the United States Securities Act of 1933 (the "Securities Act") and are subject to US tax law requirements. Subject to certain exceptions, securities may not be offered, sold or delivered in the United States or to or for the account of US persons (as defined in Regulation S under the Securities Act).

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