Transaction in Own Shares

National Grid PLC
13 December 2007

National Grid plc - Transaction in Own Shares



13 December 2007



National Grid plc announces that on 12 December 2007 it purchased 757,011 of its
ordinary shares at a price of 839.3295 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 2,554,309,797 and the
number of ordinary shares in Treasury will be 27,603,719.





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