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.

In 2000, National Grid Group acquired New England Electric System and Eastern Utilities Associates.

National Grid can refer to:

Steven John Holliday (born October 26, 1956, Exeter) is the chief executive officer of National Grid plc.

He is the son of Michael and Jean Holliday.^{[citation needed]} He went to Okehampton College. He studied at the University of Nottingham, and gained a BSc in mining engineering in 1978.

Holliday joined Exxon in 1978, where he worked until 1997.^{[citation needed]} He was operations manager of the Fawley refinery from 1988-92.^{[citation needed]} From 1997-2000 he was a board director of British Borneo Oil and Gas, which was taken over by the Italian company Eni. He joined National Grid plc in 2001, working in gas distribution.^{[citation needed]} He has been chief executive of National Grid plc since January 2007.

In 2009 his total compensation for the role of chief executive was £2.2 million, consisting of a £929,000 annual salary and a £1,277,000 bonus.

Holliday married Kate Patterson in 1996. They have three daughters, and live in west London.