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.
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 Phone Co-op was an independent consumer co-operative in the United Kingdom. It provided landline, mobile telephone and Internet services, including web hosting and broadband. In April 2018, the Phone Co-op board agreed for its operations to be transferred to the Midcounties Co-operative, with the Phone Co-op legal entity ceasing to exist. The brand continued to be operated until 1 June 2018, when it was rebranded to Your Co-op following the completion of the transfer.
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).
The Midcounties Co-operative Limited, trading as Your Co-op, is a consumer co-operative in the United Kingdom with over 700,000 members. Registered in England under the Co-operative and Community Benefit Societies Act 2014, it is a member of Co-operatives UK and Federal Retail Trading Services.
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.
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.
The availability and uptake of green electricity in the United Kingdom has increased in the 21st century. There are a number of suppliers offering green electricity in the United Kingdom. In theory these types of tariffs help to lower carbon dioxide emissions by increasing consumer demand for green electricity and encouraging more renewable energy plant to be built. Since Ofgem's 2014 regulations there are now set criteria defining what can be classified as a green source product. As well as holding sufficient guarantee of origin certificates to cover the electricity sold to consumers, suppliers are also required to show additionality by contributing to wider environmental and low carbon funds.
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.
100Green, operating as Green Energy (UK) Ltd, is a British independent-energy company based in Ware, Hertfordshire. It was established in 2001 by CEO Douglas Stewart. The company provides Ofgem-certified renewable electricity and green gas to a variety of customers, including homes, businesses, and organizations throughout Great Britain. It is currently the only energy supplier in the UK to offer 100% green gas.
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.
Solarplicity Energy Limited was a renewable energy company based in Hertfordshire, England. In August 2019 the company became the 13th energy supplier to collapse since 2018, affecting around 7,500 domestic and 500 business customers.
Spark Energy was an electricity and gas supplier in the United Kingdom, established in 2007 and headquartered in Selkirk, Scottish Borders. Its operating company Spark Energy Supply Ltd entered administration in November 2018, and industry regulator Ofgem appointed OVO Energy to take over Spark Energy's 290,000 customer accounts; OVO continues to run Spark as a separate brand, but is in the process of migrating all its customers to the SSE brand.
Flow Energy was an energy supplier in the United Kingdom owned by Co-op Energy. Its headquarters were in Ipswich, Suffolk. The company was launched as a small independent domestic energy supply company in April 2013, supplying gas and electricity to homes throughout the UK. Flow Energy was acquired by Co-op Energy in May 2018, and the Flow brand continued to be used until August 2019 when the customers were acquired by Octopus Energy.
Extra Energy Supply Ltd was an independent retail energy supplier based in Birmingham, England. It supplied gas and electricity to domestic and small business customers. Extra Energy was part of Extra Holding, which operates in industries including telecoms, travel, insurance and energy.
Robin Hood Energy was a not-for-profit energy company launched in September 2015 by Nottingham City Council as a competitor to the "big six" energy suppliers in the United Kingdom. The company supplied gas and electricity nationally to homes and businesses until September 2020, when its customer accounts were sold to Centrica, the parent company of British Gas.
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.
