Transaction in Own Shares

National Grid PLC
13 February 2008




National Grid plc - Transaction in Own Shares

13 February 2008


National Grid plc announces that on 12 February 2008 it purchased 342,738 of its
ordinary shares at a price of 778.0474 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 2,530,932,778 and the
number of ordinary shares in Treasury will be 50,980,738.


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