Total Voting Rights

Monday 3 December 2012

National Grid plc (National Grid)

Voting Rights and Capital Update

National Grid's registered capital at 30 November 2012 consisted of 3,768,040,842 ordinary shares, of which 129,913,945 are held as treasury shares; leaving a balance of 3,638,126,897 shares with voting rights.

The figure of 3,638,126,897 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.

D C Forward

Assistant Secretary

0207 004 3226