Director/PDMR Shareholding

RNS Number : 4247E

National Grid PLC

06 April 2011

6 April 2011

National Grid plc (National Grid)

Notification of Changes in Directors' Interests

-------------------------------------------------------------

Performance Share Plan - Lapse of Awards

The Trustee of the National Grid Group Employee Share Trust confirmed, yesterday, that the following awards made to Executive Directors under the National Grid Performance Share Plan 2002, in the 2007 operation of the Plan, have partially lapsed as follows:

June 2007 awards (adjusted for National Grid rights issue 2010)

Director	Original Award	Lapsed	Remaining vested
Mark Fairbairn	77,132	26,881	50,251
Steve Holliday	159,085	55,441	103,644
Steve Lucas	97,051	33,822	63,229
Nick Winser	85,712	29,871	55,841

November 2007 awards (adjusted for National Grid rights issue 2010)

Director	Original Award	Lapsed	Remaining vested
Mark Fairbairn	42,798	14,916	27,882
Steve Holliday	88,271	30,763	57,508
Tom King (ADSs)	27,432	9,560	17,872
Steve Lucas	53,850	18,767	35,083
Nick Winser	47,559	16,574	30,985

These awards were subject to a performance condition. However the performance condition was only satisfied at 65.15%, as confirmed at the 1 July 2010 performance conditions test, with the net balance of shares now held in the one year retention period before being released to participants on 28 June 2011 (June 2007 awards) and 28 November 2011 (November 2007 awards).

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