National Grid Regulatory News (NG.)

Publication of Final Terms

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

Final Terms in relation to National Grid North America Inc. issue of EUR 750,000,000 0.75 per cent. Instruments due 2022 under the National Grid USA / National Grid North America Inc. Euro 4,000,000,000 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/5632E_1-2015-2-10.pdf

A copy of the above Final Terms has 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:

David MorganGlobal Capital Markets

National Grid plc

1-3 StrandLondon WC2N 5EH

Tel: +44 20 7004 3379

Fax: +44 20 7004 3363

Chris MostynMedia Relations

National Grid plc

1-3 StrandLondon WC2N 5EH

Tel: +44 20 7004 3149

Fax: +44 20 7004 3167

DISCLAIMER - INTENDED ADDRESSEES

Please note that the information contained in the Final Terms may be addressed to and/or targeted at persons who are residents of particular countries (specified in the Base Prospectus for the National Grid USA / National Grid North America Inc. Euro 4,000,000,000 Euro Medium Term Note Programme dated 18 December 2014) only and is not intended for use and should not be relied upon by any person outside these countries. Prior to relying on the information contained in the Final Terms 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.