Transaction in Own Shares

National Grid PLC
04 January 2008

National Grid plc - Transaction in Own Shares



4 January 2008



National Grid plc announces that on 3 January 2008 it purchased 655,332 of its
ordinary shares at a price of 835.3296 pence per share from Morgan Stanley
Securities Limited. The purchased shares will be held as Treasury shares.



Following the purchase of these shares, the number of ordinary shares with
voting rights in issue (excluding Treasury shares) will be 2,548,360,535 and the
number of ordinary shares in Treasury will be 33,552,981.





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