National Grid Regulatory News (NG.)

Publication of Prospectus

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

Prospectus dated 28 July 2017 (the "Prospectus") for the National Grid plc and National Grid Electricity Transmission plc Euro 15,000,000,000 Euro Medium Term Note Programme

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

http://www.rns-pdf.londonstockexchange.com/rns/4602M_-2017-7-28.pdf

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

For further information, please contact:

Kwok LiuGlobal Capital MarketsNational Grid plc1-3 StrandLondon WC2N 5EH

Tel: +44 20 7004 3367Fax: +44 20 7004 3363

Sean KempMedia RelationsNational Grid plcWarwick House

Warwick Technology Park

Gallows Hill

Warwick

CV34 6DA

Mob: +44 7960 012 356

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.