19th January 2012

Director's Interests in National Grid plc (NG.) Ordinary Shares

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Exercise of Options

National Grid Share Matching Plan

National Grid Executive Share Option Scheme   

Today, the Trustee of the National Grid 1996 Employee Benefit Trust confirmed that, on 18 January 2012, Steve Holliday exercised an option granted in June 2002 under the National Grid Executive Share Option Scheme, over 77,129 shares granted at 421.36p per share. Of these shares, 13,117 are retained by him, after disposing of 64,012 shares, at a price of 625.2012p also on 18 January 2012, to meet exercise costs and statutory deductions.

In addition, Steve Holliday also exercised the matching award over 11,827 NG. ordinary shares, granted to him under the National Grid Share Matching Scheme operation in June 2002 (at £1.00 cost to exercise). 5,664 of these shares are retained by him, after disposing of 6,163 NG ordinary shares, at a price of 625.2012p yesterday, to meet statutory deductions.

The Trustee also confirmed the release from trust of a total of 8,944 ordinary shares representing 7,630 qualifying shares purchased in June 2002 on which the original matching award was made, together with 1,314 shares received from dividend reinvestment on those purchased shares whilst held in trust. There is no change in beneficial ownership on these 8,944 shares.

The above exercises were undertaken as the 10 year final option exercise dates in both cases were imminent.

Steve Holliday's total interest following these changes is over 2,117,086 ordinary shares. Steve Holliday's shareholding continues to exceed the share ownership guidelines.

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Contact: R.

0207 004 3223

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