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The London and Home Counties Joint Electricity Authority was a statutory body that existed from 1925-1948 whose purpose was to coordinate and rationalise the supply of electricity in the London Electricity District, an area of 1,820 square miles that included the entirety of the County of London and County of Middlesex large parts of Essex, Hertfordshire, Kent and Surrey and small areas in Berkshire and Buckinghamshire.

The district of the authority originally contained 87 electricity undertakings, either local authorities (43) or companies that been granted a franchise. These undertakings nominated members to the authority, the London County Council nominated 6 members, 3 other members were chosen by other county councils and one by the Corporation of London. By the time of the demise of the authority, the number of undertakings had decreased to 70 by the amalgamation of companies.

The authority owned little of the infrastructure of electricity generation, distribution or supply itself. It had powers over the various undertakings - companies could not construct power stations or take out large loans without its permission. In 1927 a Central Electricity Board was formed and the JEA lost most of its powers over generation and distribution. Indeed, its own plans to build a power plant at Chiswick were vetoed by the new Central board.

With nationalisation in 1948 the authority ceased to exist. The individual municipal and company electricity suppliers were taken by either the London Electricity Board or the Eastern, South Eastern and Southern Electricity Boards.

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