Director/PDMR Shareholding

RNS Number : 9662I

National Grid PLC

31 July 2012

National Grid plc (National Grid)

Notification of Changes in Directors' Interests

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Performance Share Plan - Partial Vesting of Awards

The Trustee of the National Grid Group Employee Share Trust confirmed, today, that the following awards made to Executive Directors under the National Grid Performance Share Plan 2002, in the 2009 operation of the Plan, have partially vested as follows:

June 2009 awards (adjusted for National Grid rights issue 2010)

Director	Original Award	Lapsed	Remaining vested
Steve Holliday	391,212	292,823	98,389
Tom King (ADSs)	54,403	40,720	13,683
Nick Winser	195,521	146,348	49,173

These awards were subject to a performance condition. However the performance condition was only satisfied at 25.15%, as confirmed at the 1 July 2012 performance conditions test, with the net balance of shares now held in the one year retention period before being released to participants on 25 June 2013.

The total share interests of the above directors, following these changes, are: