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As one of the largest six energy companies in the UK, British Gas, which was formed in 1986, provides power to millions of homes every day.

Big Six member E.On provides energy to for around 5 million UK homes. E.On has also been making significant inroads renewables lately, predominantly in wind power.

Shell Energy, formerly First Utility, has won awards for customer service and pricing, including a 2016 A Spokesman Said award, and a 2015 Good Housekeeping 'Reader Recommended' Stamp.

Green Star Energy focuses on eco-friendly power, with around 99% of their energy coming from renewable sources.

Fed up with what they saw as an overly complex market, OVO decided to simplify the decision process, offering just two, well priced tariffs.

Supermarket giant Sainsbury's partnered up with British Gas in 2011 to form a separate energy company providing reasonably priced power to homes across the UK.

Another member of the Big Six, Scottish Power has built up a huge customer base and are committed to investing in various renewable initiatives across the UK.

Spark Energy is one of the first suppliers to be giving all of its customers smart meters, and focuses on providing energy to tenants.

SSE plc is a British energy company headquartered in Perth, Scotland, United Kingdom. It is listed on the London Stock Exchange.

Bulb Energy offers some of the most competitive prices on the market and for 100% renewable energy.

As the third largest energy supplier in the UK, they supply gas and electricity to 6.5 million customers.

As one of the ‘Big Six’ energy suppliers, EDF Energy is the UK’s biggest supplier of low-carbon electricity by volume.