Company:  NATIONAL GRID PLC (NGG)
Form Type:  6-K
Filing Date:  12/15/2011 
CIK:  0001004315 
Address:  1-3 STRAND 
City, State, Zip:  LONDON,  WC2N 5EH 
Telephone:  (44) 207 004 3220 
Fiscal Year:  03/31 
Last Trade
Last Trade: 
$58.03  
Change: 
-0.86 (-1.46%)  
Trade Time: 
Jun 19  
Market Cap: 
$42.57B
Description of Business
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  FORM 6-K
    SIGNATURES
  EXHIBIT 99.1