1986 British Gas incorporated as a public limited company

1990 Electricity transmission network in England and Wales transferred to National Grid on electricity privatisation

1995 National Grid listed on the London Stock Exchange

1997 British Gas (BG) demerged Centrica

1997 National Grid demerged Energis

2000 Lattice Group demerged from BG and listed separately

2000 New England Electric System and Eastern Utilities Associates acquired

2002 Niagara Mohawk Power Corporation merged with National Grid in US

2002 Merger of National Grid and Lattice Group to form National Grid Transco

2004 Acquisition of UK wireless infrastructure network from Crown Castle International Corp.

2005 Sales of four UK regional gas distribution networks and adopted National Grid as our name

2006 Acquisition of Rhode Island gas distribution network

2007 Sales of UK and US wireless infrastructure operations and of the Basslink electricity interconnector in Australia

2007 Acquisition of KeySpan Corporation

2008 Sale of the Ravenswood generation station