Scottish Power Limited is a vertically integrated energy company based in Glasgow, Scotland. It is a subsidiary of Spanish utility firm Iberdrola.
Centrica plc is a British multinational energy and services company with its headquarters in Windsor, Berkshire. Its principal activity is the supply of electricity and gas to consumers in the United Kingdom and Ireland.
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).
A virtual power plant (VPP) is a system that integrates multiple, possibly heterogeneous, power sources to provide grid power. A VPP typically sells its output to an electric utility. VPPs allow energy resources that are individually too small to be of interest to a utility to aggregate and market their power. As of 2024, VPPs operated in the United States, Europe, and Australia.
Good Energy Group PLC is a British energy company based in Chippenham, Wiltshire that provides services in the electrification of transport and decentralised renewable energy generation such as domestic solar panels. The company is also an energy retailer, and built a portfolio of wind and solar generation which was sold in 2022. Founded by Juliet Davenport, its CEO is Nigel Pocklington.
The energy policy of the United Kingdom refers to the United Kingdom's efforts towards reducing energy intensity, reducing energy poverty, and maintaining energy supply reliability. The United Kingdom has had success in this, though energy intensity remains high. There is an ambitious goal to reduce carbon dioxide emissions in future years, but it is unclear whether the programmes in place are sufficient to achieve this objective. Regarding energy self-sufficiency, UK policy does not address this issue, other than to concede historic energy security is currently ceasing to exist.
E.ON UK is a British energy company and one of the largest suppliers of energy in the UK, following its acquisition of Npower. It is a subsidiary of E.ON of Germany and one of the Big Six energy suppliers. It was founded in 1989 as Powergen, and was listed on the London Stock Exchange and was once a constituent of the FTSE 100 Index. It has been a subsidiary of E.ON since 1 July 2002.
Npower Limited is a British supplier of gas and electricity to businesses. It has been a subsidiary of E.ON UK since January 2019. The company was formerly known as Innogy plc and was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index.
Ecotricity is a British energy company based in Stroud, Gloucestershire, England, specialising in selling green energy to consumers that it primarily generates from its 87.2 megawatt wind power portfolio. It is built on the principle of heavily reinvesting its profit in building more of its own green energy generation.
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.
Iceland is a world leader in renewable energy. 100% of Iceland's electricity grid is produced from renewable resources. In terms of total energy supply, 85% of the total primary energy supply in Iceland is derived from domestically produced renewable energy sources. Geothermal energy provided about 65% of primary energy in 2016, the share of hydropower was 20%, and the share of fossil fuels was 15%.
OVO Energy is a major energy supplier based in Bristol, England.
Shell Energy Retail Limited was a British consumer gas, electricity and broadband provider. Formerly a subsidiary of Shell, the business was acquired by Octopus Energy in December 2023.
Co-op Energy is a membership-owned British energy supply company based in Warwick that began trading in 2010. It sells renewable electricity and gas to its ethically concerned member owner/customers and is a established large operator, an alternative to the Big Six energy suppliers. Constituting half or more of the Your Co-op Utilities division of its parent society Midcounties Co-operative, Co-op Energy is the only co-operative supplier in the British market, meaning supplied customers can voluntarily acquire an ownership share and thereby receive rights to influence the governance of the business, stand for election and have a say in formulating the products it offers.
The Big Six were the United Kingdom's largest retail suppliers of gas and electricity, who dominated the market following liberalisation in the late 1990s. By 2002, six companies – British Gas, EDF Energy, E.ON, RWE npower, Scottish Power and SSE – had emerged from the 15 former incumbent monopoly suppliers.
Bristol Energy was a municipally owned energy supply company, founded in September 2015 by Bristol City Council. Its business accounts were sold to Yü Energy in August 2020, and in the following month its residential accounts were sold to Together Energy. In October 2020, F&S Energy purchased Bristol Energy's renewable energy generator portfolio, along with its commercial feed-in tariff customers.
Bulb Energy Ltd., trading as Bulb, was an energy supply company in the United Kingdom acquired by Octopus Energy in 2022. Founded in 2013, the company attracted venture capital from DST Global and Magnetar Capital and ran at a financial loss while achieving rapid growth in customers. Bulb claimed to provide electricity and gas from renewable or off-set sources. As of November 2021, it had a share of approximately 5-6% of the UK energy market and was considered the seventh largest in the country.
Octopus Energy Group is a British renewable energy group specialising in sustainable energy. It was founded in 2015 with the backing of British fund management company Octopus Group, a British asset management company. Headquartered in London, the company has operations in the United Kingdom, France, Germany, Italy, Spain, Australia, Japan, New Zealand and the United States. Following the acquisition of Shell Energy on 1 December 2023, Octopus Energy is the UK's second largest domestic energy provider.
Octopus Capital Limited, trading as Octopus Group, is a privately held United Kingdom based holding company founded in 2000 by Simon Rogerson, Christopher Hulatt and Guy Myles as a fund management company. Through its subsidiaries, it operates in the investment management, venture capital, energy, and real estate industries.
Pure Planet was a British energy supply company 24% owned by BP. The company, which was founded in 2015 and based in Bath, England, supplied electricity and gas to domestic customers in the UK. It ceased trading on 13 October 2021 following BP's withdrawal of support. On 17 October, Ofgem appointed Shell Energy as the new supplier of Pure Planet's customers.
