Two energy providers – Ecotricity and Good Energy – hold the title for the fourth year in a row. Octopus Energy is an Eco Provider for the second time.
At the other end of the spectrum, two gas and electricity suppliers scored zero points in our assessment.
Energy companies approach renewable energy and sustainability in different ways. Some have supported and generated renewable power for decades, some help customers cut their carbon footprint in other ways and take steps to reduce their company emissions. Others still aren't doing much towards decarbonising our energy grid.
When we surveyed people responsible for choosing their household's energy supplier, two thirds told us that a company's sustainability credentials were important to them in making their decision.*
But it can be tricky to separate the facts from the marketing spiel – which is where our behind-the-scenes assessment comes in.
Find out how your provider compares and the .Which? Eco Providers for 2024: Ecotricity, Good Energy and Octopus Energy
We assessed 17 energy suppliers on a range of sustainability criteria, based on information they shared with us in August 2024, alongside their latest fuel mix.
All three Eco Providers score full marks for buying and selling renewable power and greenhouse gas emissions.
Octopus Energy Ecotricity Good Energy Live more sustainably – .How sustainable is my energy supplier?
Here's how energy companies scored in our assessment. Swipe or scroll right to see the breakdown of score in full.
How we scored energy suppliers on sustainability
Generating, buying and selling renewable power is a key part of energy supplier sustainability, and worth half the points in our assessment.
But these aren't the only factors. This year we also looked at companies' greenhouse gas emissions, as well as other criteria, to get a fuller picture of suppliers' overall environmental impact.
We awarded points for:
Buying and selling renewable power:Generating renewable power:Fossil fuel links:Green gas:Time of use (TOU) products and SEG (Smart Export Guarantee) tariffs:Low carbon installations:Greenhouse gas emissions: Keen to cut your carbon footprint? Find out more about* Based on an online survey of 3,000 UK adults in August 2024.
source https://www.which.co.uk/news/article/most-sustainable-energy-suppliers-anfcI7X4Tb7q