15 December 2009

National Grid plc (National Grid)

Voting Rights and Capital update

National Grid has been notified that, late yesterday, 6,855 shares held in Treasury were transferred to share scheme participants and further 250,000 were transferred to share scheme trustees. Following these changes, National Grid plc's registered capital from 14 December 2009 consists of 2,606,666,100 ordinary shares, of which 146,107,721 have been purchased in the market and registered as Treasury Shares; leaving a balance of 2,460,558,379 shares with voting rights.

The figure of 2,460,558,379 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