National Grid plc (LSE:_NG., NYSE:_NGG) is a British multinational electricity and gas utility company headquartered in London, United Kingdom. Its principal activities are in the United Kingdom and northeastern United States. National Grid has a primary listing on the London Stock Exchange and is a constituent of the FTSE 100 Index. It had a market capitalisation of approximately _22_billion as of 23 December 2011, the 22nd-largest of any company with a primary listing on the London Stock Exchange. It has a secondary listing on the New York Stock Exchange. In 1990, the transmission activities of the Central Electricity Generating Board were transferred to the National Grid Company plc, which was owned by the 12 Regional Electricity Companies (RECs) through a holding company, National Grid Group plc. The company was first listed on the London Stock Exchange in 1995. Within a year, most of the RECs had disposed of their interests.
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