Director/PDMR Shareholding

17 June 2016

National Grid plc (National Grid)

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Notification of Directors' and Executive Committee Members Interests____________________________________________________________

National Grid Annual Performance Plan- 2016 Award

On 16 June 2016, National Grid received notification from UBS Limited, pursuant to the National Grid plc Annual Performance Plan ("APP"), that Ordinary shares in National Grid (the 'Shares') or American Depositary Shares (ADSs) were purchased in the market under the APP on Wednesday 15 June 2016, at a share price of 965.39p or an ADS price of $68.99. These Awards relate to 50% of the APP awards for Executive Directors and 33.33% for Executive Committee Members for 2015/16 being paid in shares, which (after tax on the gross cash award) must be retained until shareholding requirement is met, and in any event for two years after receipt. These awards are subject to clawback and malus provisions. The Shares and ADSs have been transferred to participants.

Awards to the Executive Directors and Executive Committee Members are as follows:

The total share interests of the above directors and executive committee members, following these changes, are: