Holding(s) in Company

National Grid plc (National Grid)

18th July 2013

Notification of Major Interest in NG. Ordinary Shares

National Grid today received a further notification from Crescent Holding GmbH, over total return equity swaps.

The relevant transactions have been in place for a number of years and (as required by changes made to DTR5) were initially notified in June 2009.

This notification is merely as a result of the extension, on 17 July 2013, of the existing position, to 22 July 2014, over 149,414,285 National Grid plc ordinary shares (4.07% of the voting share capital). No threshold was crossed.

This notice is given in fulfillment of National Grid plc's obligation under the DTR requirements.