Total Voting Rights



Monday, 12 March 2012

National Grid plc (National Grid)

Voting Rights and Capital update

National Grid has been notified that earlier today, 23,820 shares held in treasury were transferred to share scheme participants. Following this change, National Grid's registered capital from 12 March 2012 consists of 3,700,949,542 ordinary shares, of which 135,417,528 are held as treasury shares; leaving a balance of 3,565,532,014 shares with voting rights.

The figure of 3,565,532,014 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