Total Voting Rights

Thursday, 1 November 2012

National Grid plc (National Grid)

Voting Rights and Capital Update

National Grid's registered capital at 31 October 2012 consisted of 3,768,040,842 ordinary shares, of which 129,935,918 are held as treasury shares, leaving a balance of 3,638,104,924 shares with voting rights.

The figure of 3,638,104,924 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