Monday 1 February 2010

National Grid plc (National Grid)

Voting Rights and Capital update

National Grid plc's registered capital at 31 January 2010 consisted of 2,617,190,095 ordinary shares, of which 145,818,673 had been purchased in the market and registered as Treasury Shares; leaving a balance of 2,471,371,422 shares with voting rights.

National Grid has also been notified that, earlier today, 10,774 shares held in Treasury were transferred to share scheme participants. Following this change, National Grid plc's registered capital from 1 February 2010 consists of 2,617,190,095 ordinary shares, of which 145,807,899 have been purchased in the market and registered as Treasury Shares; leaving a balance of 2,471,382,196 shares with voting rights.

The figure of 2,471,382,196 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 plc under the FSA's Disclosure and Transparency Rules.

Contact: D C Forward,

Assistant Secretary

0207 004 3226