Total Voting Rights

Thursday, 1 March 2012

National Grid plc (National Grid)

Voting Rights and Capital update

National Grid's registered capital at 29 February 2012 consisted of 3,700,949,542 ordinary shares, of which 135,441,348 are held as treasury shares; leaving a balance of 3,565,508,194 shares with voting rights.

The figure of 3,565,508,194 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: Arit Amana

Company Secretarial Assistant

020 7004 3116