Director/PDMR Shareholding

RNS Number : 8273N

National Grid PLC

17 June 2010

National Grid plc ('National Grid')

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Notification of Directors' Interests
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Deferred Share Plan

On 16 June 2010, National Grid received a notification from ExcellerateHRO Share Plan Services (Guernsey) Limited, as Trustee of the National Grid Group Employee Share Trust (the 'Trust'), operated in conjunction with the National Grid Deferred Share Plan, the following directors were granted an award of Ordinary shares in National Grid (the 'Shares') or American Depositary Shares (ADSs) under the Plan on Tuesday 15 June 2010, calculated by reference to a share price of 506.294p or an ADS price of $37.7474. The awards will vest on the third anniversary of the date of grant (June 2013). The shares will be transferred to participants net of deductions as soon as practicable thereafter.

Director Number of ADSs

Tom King 18,776

Number of Shares

Mark Fairbairn 52,015

Steve Holliday 130,636

Steve Lucas 72,073

Nick Winser 64,370

The total share interests of the above directors, following these changes and taking into account the rights issue adjustment over options and share awards, are:

Director Number of ADSs