How we rate energy suppliers

We assess UK energy suppliers across four key areas: price competitiveness, customer service ratings, tariff flexibility, and green energy credentials. Our ratings are based on publicly available data including Trustpilot scores, Citizens Advice data, and Ofgem reporting.

The best supplier for you will depend on your priorities — some people want the cheapest deal, others prioritise customer service or renewable energy.

1. Octopus Energy

Octopus Energy is the UK’s most popular energy supplier and consistently tops customer satisfaction surveys. They’re known for excellent customer service, innovative tariffs, and a strong commitment to renewable energy.

Their Flexible Octopus tariff tracks the wholesale energy price and is often one of the cheapest options available. They also offer smart tariffs for electric vehicle owners and households with solar panels.

2. E.ON Next

E.ON Next is the retail arm of E.ON, one of Europe’s largest energy companies. They offer a range of fixed and flexible tariffs and have significantly improved their customer service ratings in recent years.

Their Next Flex tariff is a popular choice for households who want flexibility without being locked into a long contract.

3. EDF Energy

EDF Energy is one of the UK’s Big Six energy suppliers and is particularly strong on fixed tariff pricing. They’re known for price stability and a straightforward customer experience.

If you want the certainty of a fixed rate and don’t want to worry about prices changing mid-contract, EDF is worth considering.

4. British Gas

British Gas is the UK’s largest energy supplier by customer numbers and one of the most recognisable brands in the market. While not always the cheapest, they offer added value through boiler cover and home services bundles.

Their customer service ratings have improved in recent years, though they still trail behind newer suppliers like Octopus.

5. Scottish Power

Scottish Power supplies 100% renewable electricity across all their tariffs, making them a strong choice for environmentally conscious households. They’re owned by Iberdrola, one of the world’s largest renewable energy companies.

Their pricing is competitive and they offer a range of fixed tariffs with reasonable contract lengths.

How to choose the right energy supplier

The right supplier depends on what matters most to you. Here’s a quick guide:

The most important thing is to compare deals based on your actual postcode and usage — prices vary by region and the cheapest supplier for one household may not be the cheapest for another.