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Energy companies advice guides

Which? energy company reviews reveal the best and worst suppliers based on feedback from their customers, plus our expert verdict on their procedures, practices around customer service and complaints and pricing.

20 articles

Green energy suppliers

Find out about different types of green energy and what you're getting when you buy electricity from different renewable energy companies

Small energy companies

Find out more about small, independent energy firms. Should you switch to a small energy company?

Best and worst energy companies

See which energy companies came top of our annual customer satisfaction survey.

Bristol Energy

Bristol Energy ceased trading on 18 January 2022. If you have been affected, find out what to do below

20 January 2022

Bulb Energy

Bulb Energy went into special administration on 22nd November 2021.

10 January 2022

Northern Ireland electricity and gas

Find out which energy companies came top in Northern Ireland in our annual customer satisfaction survey.

7 January 2022

Scottish Power

Scottish Power is one of the biggest energy companies in the UK. Owned by Spanish company Iberdrola, it has more than five million customers.

3 December 2021

British Gas

British Gas is Britain's biggest domestic energy supplier, but is it the best? Find out what customers think of it.

3 December 2021

Utilita

Utilita specialises in pay-as-you-go prepayment smart meters. Click to find out more.

9 November 2021

EDF Energy

French-owned EDF Energy generates a fifth of the UK’s electricity. But how is EDF rated by its customers?

21 October 2021

Shell Energy

Shell Energy was originally called First Utility when it launched in 2008 and was the first energy firm to introduce smart meters.

21 October 2021

Utility Warehouse

Utility Warehouse is an energy supplier that also sells phone, broadband, mobile and boiler services.

21 October 2021

Boost Energy

Boost is a dedicated pay-as-you-go brand that's part of Ovo Energy. Use our Boost review to find out if it's the right gas and electricity supplier for you.

21 October 2021

SSE

SSE (formerly Scottish and Southern Electric) includes the brands Atlantic, Scottish Hydro, Southern Electric and Swalec.

21 October 2021

Outfox the Market

Find out how customers rank new price-conscious energy firm Outfox the Market.

21 October 2021

So Energy

Use our energy comparison to find out if So Energy is the best energy firm for you.

21 October 2021

Ovo Energy

Ovo Energy joined the energy market in 2009. It claims to offer simpler, greener tariffs.

21 October 2021

Eon

Eon supplies gas and electricity to almost four million homes and businesses.

21 October 2021

Octopus Energy

Find out what Octopus Energy customers think of it in our energy comparison.

21 October 2021

Sainsbury's Energy

Sainsbury's Energy is a partnership with Eon Next. Find out how customers rate the service.

21 October 2021