Northern Electric was an electricity supply and distribution company serving north east England.
Scottish Power Limited, trading as ScottishPower, is a vertically integrated energy company based in Glasgow, Scotland. It is a subsidiary of Spanish utility firm Iberdrola.
The British Electricity Authority (BEA) was established as the central British electricity authority in 1948 under the nationalisation of Great Britain's electricity supply industry enacted by the Electricity Act 1947. The BEA was responsible for the generation, transmission and sale of electricity to area electricity boards, and the development and maintenance of an efficient, coordinated and economical system of electricity supply.
The Office of Gas and Electricity Markets (Ofgem), supporting the Gas and Electricity Markets Authority, is the government regulator for the electricity and downstream natural gas markets in Great Britain. It was formed by the merger of the Office of Electricity Regulation (OFFER) and Office of Gas Supply (Ofgas).
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.
The North of Scotland Hydro-Electric Board (1943–1990) was founded to design, construct and manage hydroelectricity projects in the Highlands of Scotland. It is regarded as one of the major achievements of Scottish politician Thomas Johnston, who chaired the board from 1945 to 1959.
SWALEC was an electricity supply and distribution company in South Wales, established in 1989 following the de-regulation of the electricity supply industry in the United Kingdom. The business has seen several changes of ownership from 1996, and the SWALEC brand has been used for retail gas supply as well as electricity. Today National Grid runs the distribution network business, and SWALEC Contracting is a trading name of OVO Energy. The name SWALEC is a syllabic acronym of 'South Wales Electricity'.
The South of Scotland Electricity Board (SSEB) generated, transmitted and distributed electricity throughout the south of Scotland, including the former regions of Strathclyde, Lothian, Fife, Central, Borders and Dumfries and Galloway and a few towns in northern England. It operated from 1955 to 1991.
Yorkshire Electricity was an electricity distribution utility in England, serving much of Yorkshire and parts of Derbyshire, Lincolnshire and Nottinghamshire.
Eastern Electricity plc was an electricity supply and distribution utility serving Eastern England, including East Anglia and part of Greater London. It was renamed Eastern Group under which name it was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index until it was acquired by Hanson plc in 1995, before being purchased by Texas Utilities in 1998.
Seeboard, formerly South Eastern Electricity Board (SEEB), was a British electricity company. The electrical power industry in the United Kingdom was nationalised by the Electricity Act 1947, when over 600 electric power companies were merged into 12 area boards, one of which was the South Eastern Electricity Board. At its closure it served nearly 2 million residential customers.
The London Electricity Board was the public sector utility company responsible for the supply and distribution of electricity to domestic, commercial and industrial consumers in London prior to 1990. It also sold and made available for hire and hire-purchase domestic electrical appliances through local showrooms where electricity bills could also be paid. It was shortened to LEB in its green and blue logo, consisting of the three letters. As London Electricity plc it was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index.
Scottish Nuclear was formed as a precursor to the privatisation of the electricity supply industry in Scotland on 1 April 1990. A purpose-built headquarters was built in 1992 in the new town of East Kilbride.
Scottish Hydro plc was a public electricity supplier formed on 1 August 1989 after a change of name from North of Scotland Electricity plc on that date. It was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index but merged with Southern Electric in 1998.
British Gas is an energy and home services provider in the United Kingdom. It is the trading name of British Gas Services Limited and British Gas New Heating Limited, both subsidiaries of Centrica. Serving around ten million homes in the United Kingdom, British Gas was the largest energy supplier in the country until 2024 when it was overtaken by Octopus Energy. It remains the largest gas supplier. It is considered one of the Big Six dominating the gas and electricity market in the United Kingdom.
SSE plc is a multinational energy company headquartered in Perth, Scotland. It is listed on the London Stock Exchange, and is a constituent of the FTSE 100 Index. SSE operates in the United Kingdom and Ireland.
SSE Renewables is a renewable energy subsidiary of SSE plc, which develops and operates onshore and offshore wind farms and hydroelectric generation in the United Kingdom and Ireland.
OVO Energy is a major energy supplier based in Bristol, England.
The Electricity Act 1989 provided for the privatisation of the electricity supply industry in Great Britain, by replacing the Central Electricity Generating Board in England and Wales and by restructuring the South of Scotland Electricity Board and the North of Scotland Hydro-Electric Board. The Act also established a licensing regime and a regulator for the industry called the Office of Electricity Regulation (OFFER), which has since become the Office of Gas and Electricity Markets (OFGEM).
Scottish and Southern Electricity Networks is one of two energy companies in the UK to be involved both in electricity transmission and distribution.
