Total Voting Rights

Tuesday, 1 May 2012

National Grid plc (National Grid)

Voting Rights and Capital update

National Grid's registered capital at 30 April 2012 consisted of 3,700,949,542 ordinary shares, of which 131,789,165 are held as treasury shares, leaving a balance of 3,569,160,377 shares with voting rights.

The figure of 3,569,160,377 may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, National Grid under the FSA's Disclosure and Transparency Rules.

Contact: Amy Bailey

Company Secretarial Assistant

020 7004 3213