Total Voting Rights

1 December 2014

National Grid plc (National Grid)

Voting Rights and Capital Update

National Grid's registered capital as at 30 November 2014 consisted of 3,888,927,949 ordinary shares, of which, 122,679,962 were held as treasury shares; leaving a balance of 3,766,247,987 shares with voting rights.

The figure of 3,766,247,987 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 FCA Disclosure and Transparency Rules.

Contact: D Whincup, Company Secretarial Assistant, (0207 004 3209).