Transaction in Own Shares

National Grid PLC
25 March 2008


National Grid plc - Transaction in Own Shares

25 March 2008

National Grid plc announces that on 20 March 2008 it purchased 480,000 of its
ordinary shares at a price of 727.83 pence per share from Deutsche Bank AG
London Branch. 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 2,516,343,195 and the
number of ordinary shares in Treasury will be 65,570,321.

End




                      This information is provided by RNS
            The company news service from the London Stock Exchange