Public electricity suppliers (PES) were the fourteen electricity companies created in Great Britain when the electricity market in the United Kingdom was privatised following the Electricity Act 1989. The Utilities Act 2000 subsequently split these companies between distribution network operators and separate supply companies.
In England and Wales the Central Electricity Generating Board had been responsible for the generation and transmission of electricity, with the twelve area electricity boards (AEBs) formed under the Electricity Act 1947 responsible for the distribution and supply of electricity to consumers.
In Scotland the structure was different, with all aspects of generation, transmission, distribution and supply being carried out by two vertically integrated companies.
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