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Energy suppliers: Which? Recommended Providers
The accolade of Which? Recommended Provider for energy is only awarded to the companies that we’re confident meet the highest standards and are well liked by those who use them.
It’s not easy to achieve – if no companies live up to our high standards, we’re not afraid to leave the industry empty-handed.
Read on to find out which energy firms are Which? Recommended Providers for energy in 2026 and how we assess companies for the qualification.
Which? Recommended Provider for energy 2026
Four companies achieved the coveted Which? Recommended Provider (WRP) status in 2026. They are:
WRPs must make it through our tough assessments, which include an analysis of their practices and a survey to find out what customers really think of them.
Octopus Energy has been a WRP for nine years running, and this is 100Green's second year with the award. E (Gas & Electricity) was a WRP in 2024, but lost its status in 2025, before regaining it in our latest analysis. It's the first time Sainsbury's Energy has been named a WRP.
These four firms achieved high scores in both our independent assessment of their policies and practices and in our customer survey. They were the only four suppliers to receive four stars out of five for overall customer service.
Here's a snapshot of some key details:
| Criteria | E | Octopus Energy | 100Green | Sainsbury's Energy |
| Total score | 79% | 74% | 72% | 71% |
| Customer score | 78% | 79% | 82% | 76% |
| Which? assessment score | 79% | 69% | 61% | 66% |
Total score is a combination of customer score and Which? assessment score. Customer score is based on an online survey of 11,945 energy customers among the general public in Great Britain in September-October 2025. Sample sizes were E (92); Octopus Energy (2,708); 100Green (146); Sainsbury's Energy (79). Which? assessment score is based on complaints performance (30%), contacting your supplier (25%) help for those who need it (25%), smart meters (10%) and switching (10%). Assessment carried out in September-November 2025.
Find out more about each company in our dedicated reviews of E (Gas & Electricity), Octopus Energy, 100Green and Sainsbury's Energy.
Which? Recommended Provider criteria
To decide which companies are good enough to become Which? Recommended Providers, we carry out two separate assessments. We only award Which? Recommended Provider (WRP) status to companies which pass our stringent criteria in both assessments, so we're confident that they're the best of the best and won't let you down.
Energy satisfaction survey
Our energy satisfaction survey is the first piece in the puzzle for aspiring Which? Recommended Providers. Our survey asks customers to rate their suppliers for customer service, ease of contacting, value for money, and more.
To be in the running to become a WRP, companies must be one of the top-ranked companies, with an overall customer score of at least 70%, based on feedback from their customers.
See our full energy survey results to compare energy companies.
Assessment of supplier policies and practices
In addition to our customer satisfaction survey, we carry out detailed behind-the-scenes analysis of energy companies' practices, to ensure companies have practices that we think are in the best interest of customers. We continually review and improve our criteria to make sure they're focused on what's most important to customers.
We score energy companies in five key areas, using a combination of the responses to a survey we send to suppliers and our own assessments:
- Complaints – how many complaints suppliers get and how quickly they resolve them
- Contacting your supplier – including how and when you can get in touch, call waiting times, and the quality of self-service help online
- Help for customers who need it – including those in vulnerable situations, those who use prepayment meters, those who need materials in languages besides English, and web accessibility
- Smart meters – including performance against 2024 smart meter targets and the proportion of customers' smart meters actually operating in smart mode
- Switching – how well suppliers handle switching.
Which? Recommended Providers must score above average in this assessment.
Previous energy WRPs
Ecotricity, Ovo Energy, So Energy, and Utility Warehouse have all previously previously been Which? Recommended Providers.
Utility Warehouse was a WRP in 2025, Ecotricity was a WRP in 2024, and So Energy was a WRP in 2020. Ovo Energy received the qualification a full decade ago in 2016, but lost it when it raised its prices. Ovo Energy was also our very first WRP in 2015.
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