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Click here for demerger history graphic (PDF)

1986
 In August 1986 Privatisation of British Gas Corporation by the UKGovernment. All assets transferred to BritishGas plc, shares first traded in December.
1997
 In February 1997 the shareholders of British Gas plc approved the demerger of Centrica plc. British Gas plc was renamed BG plc.
1999
 In December 1999 BG plc completed a financial restructuring which resulted in the creation of a new parent company, BG Group plc.
2000
 In October 2000 BG Group plc completed the demerger of Lattice Group plc creating two separate companies.
2002
 In October 2002 Lattice Group plc merged with National Grid to form National Grid Transco.
2005
 In July 2005 National Grid Transco plc was renamed National Grid plc to provide a unifying identity across its operations.