Transaction in Own Shares

National Grid PLC
19 December 2007

National Grid plc - Transaction in Own Shares



19 December 2007



National Grid plc announces that on 18 December 2007 it purchased 780,000 of its
ordinary shares at a price of 828.8524 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 2,551,559,842 and the
number of ordinary shares in Treasury will be 30,353,674.





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