Transaction in Own Shares

National Grid PLC
17 March 2008

National Grid plc - Transaction in Own Shares



17 March 2008



National Grid plc announces that on 14 March 2008 it purchased 544,447 of its
ordinary shares at a price of 719.3713 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 2,517,957,659 and the
number of ordinary shares in Treasury will be 63,955,857.



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