Total Voting Rights

2 April 2013

National Grid plc (National Grid)

Voting Rights and Capital Update

National Grid's registered capital as at 31 March 2013 consisted of

3,794,575,998 ordinary shares, of which 129,231,371 are held as treasury shares; leaving a balance of 3,665,344,627 shares with voting rights.

The figure of 3,665,344,627 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: D C Forward, Assistant Secretary, (0207 004 3226).