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.

Centrica plc is a British multinational energy and services company with its headquarters in Windsor, Berkshire, England. It is the largest supplier of gas to domestic customers in the United Kingdom, and one of the largest suppliers of electricity, operating under the trading names British Gas in England and…

A feed-in tariff (FIT) is paid by energy suppliers in the United Kingdom if a property or organisation generates their own electricity using technology such as solar panels or wind turbines and feeds any surplus back to the grid. The FIT scheme was imposed on suppliers by the UK government, and applied to…

Utilita Energy is an electricity and gas supplier operating in the United Kingdom. Utilita began trading in 2003, specialising in pay-as-you-go metering.

Outfox Energy, the trading name of Foxglove Energy Supply Limited, is a British energy supplier based in Leicester, United Kingdom. It was founded in 2017.

Synchronverters (also called virtual synchronous generators or virtual synchronous machines) are inverters which mimic synchronous generators (SG) to provide "synthetic inertia" for ancillary services in electric power systems. Inertia is a property of standard synchronous generators associated with the rotating…

npower Business Solutions is a British supplier of gas and electricity to large businesses. It has been a subsidiary of E.ON UK since January 2019.

Ferrellgas Partners, L.P. is an American supplier of propane founded in 1939 in Atchison, Kansas by A.C. Ferrell. The nationwide company is headquartered in Liberty, Missouri.

Extra Energy Supply Ltd (trading as extraenergy) was an independent retail energy supplier based in Birmingham, England. It supplied gas and electricity to domestic and small business customers.

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.