Consumer experts Which? have named E (Gas & Electricity) as the UK's best energy provider for 2026, with an overall score of 79%, outperforming major suppliers such as Octopus Energy, British Gas, and Ovo Energy.
Survey Methodology and Results
The annual Which? energy satisfaction survey, published at the beginning of 2026, covers 17 suppliers in Great Britain. The results are based on nearly 12,000 energy customers who reported on the service they receive. Which? also conducted its own in-depth assessment of firms' practices to evaluate which are set up in the best interests of their customers. Both criteria were combined to produce the final ranking.
"We surveyed 11,945 members of the general public in September-October 2025," the experts said. "We assessed firms' behind-the-scenes practices in September-November 2025 to compare their approaches to methods of contact, supporting customers who need it, how they performed against their smart meter targets, switching, and complaints data."
Top Four Recommended Providers
Four providers received Which? Recommended titles. E (Gas & Electricity) topped the list with an overall score of 79%, comprising a customer survey score of 78% and a Which? assessment score of 79%. The company promises low prices and offers a £50 loyalty credit after 12 months of gas and electricity supply. It also allows customers to pay in advance using a key for electricity and a card for gas.
In second place is Octopus Energy with a score of 74%, followed by 100Green in third place with a final score of 72%. However, 100Green achieved the highest customer survey score at 82%.
Full Ranking of UK Energy Providers
The complete list of UK energy providers ranked by Which? from best to worst is as follows: E (Gas & Electricity), Octopus Energy, 100Green, Co-op Energy, Sainsbury's Energy, Outfox Energy, Good Energy, Utility Warehouse, Utilita, Ecotricity, Fuse Energy, E. On Energy, Ovo Energy, So Energy, British Gas, EDF Energy, and Scottish Power.
Scoring Criteria
The customer score is based on satisfaction and likelihood to recommend. The Which? assessment score is derived from complaint performance (30%), contacting your supplier (25%), help for those who need it (25%), smart meter policies and targets (10%), and switching (10%).
