Gas & electricity suppliers · Great Britain
Who supplies Britain’s homes, what each type of supplier is known for, and how to check customer service before you switch. No paid rankings, just the facts and links to check.
Photo: Fré Sonneveld on Unsplash
Filter by type. Links go to each supplier’s own website. We don’t rate suppliers: see Citizens Advice’s customer service rankings for that.
Large supplier
Became Britain’s largest household supplier after taking on Bulb and Shell Energy’s home customers. Known for smart and EV tariffs such as Agile, Go and Tracker.
Large supplier
The UK’s longest-established home energy brand and still the largest supplier of household gas. Owned by Centrica.
Large supplier
Formed from E.ON UK and npower’s customers. Agreed to buy OVO in 2026: the takeover was cleared by the competition regulator in October and is expected to complete later.
Large supplier
Grew by taking on SSE’s household customers. Being bought by E.ON: OVO says customers will be told well in advance of any change, and existing tariffs will be honoured.
Large supplier
Part of the French state-owned EDF group, which runs Britain’s nuclear power stations. Offers fixed, EV and export tariffs.
Large supplier
Owned by Iberdrola and one of the UK’s biggest wind power developers. Supplies homes across Great Britain, not only Scotland.
Multi-service
Bundles energy with broadband, mobile and insurance, with savings for taking more services. Sold through partners rather than price comparison sites.
Challenger
Mid-sized independent supplier that took on ESB Energy’s customers. Focus on renewable-backed electricity and simple tariffs.
Challenger
Online-only supplier built around low overheads and simple pricing. Check which fuels and tariffs are available at your address.
Challenger
App-based newer supplier that also develops its own renewable energy projects.
Green specialist
Long-standing green supplier that buys renewable electricity from independent UK generators. Also a big player in feed-in and export payments.
Green specialist
Green energy company founded in 1995 that builds its own wind and solar parks and offers green gas.
Green specialist
Independent green supplier known for green gas and its TIDE time-of-use electricity tariff.
Prepay specialist
Specialises in smart pay-as-you-go energy, topped up by app, online or in shops.
A handful of large companies supply the vast majority of British homes. Octopus Energy is now the largest household supplier, followed by British Gas, E.ON Next, OVO, EDF and ScottishPower. Most of the smaller suppliers that collapsed during the 2021–22 crisis had their customers moved to one of these firms under Ofgem’s “Supplier of Last Resort” process, so you may be with a big supplier without ever having chosen it.
Big news: E.ON has agreed to buy OVO. The deal received competition clearance in early October 2026. Until it completes, the two firms keep operating separately and all existing tariffs are honoured. Read what the E.ON and OVO takeover means for you.
Sources: MoneySavingExpert: E.ON and OVO takeover · Which?: what the takeover means for OVO customers.
Sources: Citizens Advice: compare energy suppliers’ customer service · Citizens Advice: energy supply.
Complain to the supplier first. If it isn’t resolved within eight weeks, or you get a final response you’re unhappy with, you can take it to the free Energy Ombudsman. If your supplier goes bust, Ofgem appoints a new one and your supply continues; credit balances are protected.
Last updated: 15 October 2026
Fixed, variable, tracker, time-of-use, EV, prepay and more.
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Check any deal against the cap, standing charges and exit fees.
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Current Ofgem rates, the VAT change and January forecasts.
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