Ecotricity, Good Energy and Octopus Energy scored highly in our sustainability assessment of gas and electricity firms. How do British Gas, Ovo Energy and Scottish Power compare?

The Great British Insulation Scheme and the Energy Company Obligation (ECO) could help you get free insulation or other financial support from your energy supplier to make your home more energy efficient. Here's how they work.

Energy companies take different approaches to selling renewable electricity. We compare them so you can find out which is best for you – plus how sustainable they really are

Octopus Energy, Ecotricity and Good Energy have come top in the latest Which? annual rankings of energy firm green credentials, while E and Outfox the Market finished bottom

...renewable power and also scored highly for generating renewable power or selling green gas. 100 Green, Ecotricity, Good Energy and Octopus Energy are all Eco Providers for 2023...

Our research can help you find the best gas and electricity firm for you now that switching is back on the cards.

Octopus Energy says it is using technology to make energy 'fair, clean and simple for all'. It's well liked by customers and experts, making it a Which? Recommended Provider.

Can you get free insulation? Insulating your home is one of the most effective ways to cut your energy bills. Find out how your energy supplier could help.

We explain the pros and cons of choosing smaller gas and electricity companies. Here's what you need to know about small energy suppliers

Which? response to the consultation on the ECO+ consultation including how to deliver insulation measures to improve home energy efficiency (Design of the Energy Company Obligation ECO+: 2023 - 2026)