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Best energy suppliers in 2026
Selecting the right energy supplier for your home is crucial for your comfort and budget. To save you the legwork, we’ve analysed the latest data to identify the best options available in 2026.
In a comprehensive survey by Which? over 9,000 customers weighed in on their experiences with various energy suppliers. Based on this extensive feedback, here are the top 10 energy suppliers of 2026:
| Ranking | Energy Supplier | Customer satisfaction score* | Which? Assessment score** | Overall Score** |
|---|---|---|---|---|
| 1 | E | 78% | 79% | 79% |
| 2 | Octopus Energy | 79% | 69% | 74% |
| 3 | 100 Green | 82% | 61% | 72% |
| 4 | Co-op Energy | 73% | 69% | 71% |
| 5 | Sainsbury's Energy | 76% | 66% | 71% |
| 6 | Out Fox the Market | 73% | 68% | 71% |
| 7 | Good Energy | 81% | 57% | 69% |
| 8 | Utility Warehouse | 72% | 65% | 69% |
| 9 | Utilita | 68% | 68% | 68% |
| 10 | Ecotricty Energy | 67% | 65% | 66% |
** “Which?” assessment score is based on: support for vulnerable customers (40%); complaints performance (30%); customer service (30%).
***Total score is a combination of the customer score and Which? assessment score.
Source: Which? Customer survey data
Top 10 energy suppliers in 2026
The latest Which? energy survey, published in January 2026, ranks the UK’s top energy suppliers based on customer satisfaction, value for money, and support. Some providers earned the title of Which? Recommended Provider, while others performed well overall but didn’t meet all the criteria.
Here are the top 10 energy suppliers for 2026:
#1 E
E climbed from 5th place last year to 1st place in the latest rankings, achieving the highest overall score of 79%. As a pay-as-you-go specialist, it performed strongly for value for money, customer service, and support for vulnerable customers. This sharp rise reflects consistent improvements in service and customer experience, earning E the Which? Recommended Provider status.
#2 Octopus Energy
Octopus Energy slipped from 1st place to 2nd in the most recent rankings, with a total score of 74%, but remains one of the highest rated suppliers in the UK. It continues to score highly for customer satisfaction, clear billing, and support for vulnerable customers. Octopus is also widely recognised for its commitment to renewable energy and innovative, customer-focused services.
#3 100Green
100Green rose from 4th place to 3rd in the latest rankings, reinforcing its position as one of the UK’s top-performing energy suppliers. It achieved four-star ratings across key customer service categories. 100Green continues to be recognised for its high service standards, although it scored lower for support of vulnerable customers.
#4 Co-op Energy
Co-op Energy moved up from 6th place to 4th in the latest rankings, reflecting improved performance across key service areas. While it receivedaverage ratings for bill clarity, its steady progress and customer-focused approach have helped strengthen its position among the UK’s leading suppliers.
#5 Sainsbury’s Energy
Sainsbury’s Energy recorded one of the biggest rises in the latest rankings, climbing from 9th place to 5th. Partnered with E.ON Next, it achieved a strong overall score of 71%, with customers continuing to value the integration with Nectar points. The supplier received positive ratings for value for money, bill clarity, and payment accuracy.
#6 Outfox the Market
Outfox the Market moved up slightly from 7th place to 6th in the latest Which? rankings, achieving an overall score of 71%. It continued to perform strongly for payment accuracy and value for money, maintaining its appeal among price-focused customers. This steady improvement reflects consistent delivery across its core service areas.
#7 Good Energy
Good Energy entered the top 10 for the first time, securing 7th place with an overall score of 69%. The supplier performed well for customer satisfaction and overall service, reflecting its focus on ethical energy and transparent pricing. Its debut into the top ten highlights growing customer confidence.
#8 Utility Warehouse
Utility Warehouse saw a notable fall in the latest rankings, dropping from 2nd place to 8th, with an overall score of 69%. Its latest results suggest a decline in overall customer satisfaction compared with last year. The supplier continues to perform reasonably well for value for money and billing, but this drop indicates that service consistency may be an area for improvement.
#9 Utilita
Utilita experienced a significant fall in the latest rankings, dropping from 3rd place to 9th, with an overall score of 68%. As a specialist in pay-as-you-go tariffs, it continues to perform well in areas such as communication clarity and support for vulnerable customers. However, the decline in ranking suggests that overall customer satisfaction and service delivery have weakened.
#10 Ecotricity
Ecotricity slipped from 8th place to 10th in the latest rankings, with an overall score of 66%. The supplier continues to be recognised for its focus on renewable energy generation and environmental values. However, its latest results indicate weaker performance in customer satisfaction and service.
Which energy supplier has the best customer service?
E topped the latest Which? survey, securing first place overall with the highest total score. It performed strongly for customer satisfaction, value for money, and support for vulnerable customers, helping it rise to the top of the rankings.
100Green recorded the highest customer score in the survey, reflecting consistently strong feedback for service quality and reliability. Its high customer ratings played a key role in its move up the table and Which? Recommended Provider status.
What makes the “best” energy supplier?
The definition of the “best” energy supplier depends on your individual preferences and needs. For some, it might be a supplier with a pay-as-you-go scheme; for others, it could be excelling in supporting vulnerable customers or offering 100% renewable energy.
Here are three key factors to help you determine the “best” energy supplier for your specific needs:
Customer service and complaint handling
An energy supplier with excellent customer service and efficient complaint handling can make a big difference. Look for suppliers that respond promptly to queries and resolve issues on the first attempt.
Value for money
Good value for money is crucial when choosing an energy supplier. Compare electricity prices using tools like our home energy comparison tool to find a supplier that aligns with your household’s budget.
Green energy
If sustainability is a priority, consider suppliers offering renewable energy options or specific green tariffs. Providers like Octopus Energy, Ecotricty, Ovo Energy, and EDF Energy can help reduce your home’s carbon footprint with renewable energy solutions.
How do I choose the best energy supplier?
With numerous energy suppliers operating in the UK, choosing the best one for your needs can feel overwhelming. While switching energy suppliers is more accessible now than during recent market turbulence, making an informed decision is key.
Here are some factors to consider when selecting the right supplier for your household:
Biggest energy suppliers
The UK’s largest energy suppliers, often referred to as the “big six,” include:
- British Gas
- EDF Energy
- E.ON Next
- Ovo Energy
- SSE (owned by OVO)
- Scottish Power
These companies supply energy to most UK households and are generally considered more stable during market challenges. However, in the ‘Which? Best Supplier’s latest survey, none of the big six ranked in the top three, with smaller and greener suppliers often performing better in customer satisfaction.
Renewable energy suppliers
Renewable energy suppliers are an attractive option for those looking to reduce their carbon footprint. Providers like Octopus Energy, Good Energy, and Ecotricity offer tariffs powered by renewable sources.
Keep in mind that “green” tariffs do not all use the same energy sources, so it’s essential to check the supplier’s fuel mix and commitment to sustainability before making a decision.
Smart and online energy suppliers
If convenience is a priority, consider suppliers offering smart technologies and app-based management:
- Boost Energy and Utilita specialise in pay-as-you-go prepayment meters with easy top-ups via mobile apps.
- Ovo Energy and British Gas offer apps to monitor and manage home energy consumption, including integration with smart meters.
- Many suppliers now provide Smart Home products, such as thermostats, motion sensors, and smart plugs, for additional control and efficiency.
Energy and utility bundles
Some energy suppliers offer bundled services for those seeking simplicity and cost savings, bundling energy with broadband, mobile contracts, or insurance. Utility Warehouse is a leading provider, offering comprehensive packages tailored to household needs.
FAQs – Best energy supplier
Our energy experts answer those commonly asked questions about domestic energy suppliers.
Who is the cheapest energy supplier in the UK?
There isn’t a single “cheapest” energy supplier in the UK, as this depends on your circumstances. The following factors decide the cost of your energy bills:
- Location: Energy prices vary by region and the wholesale source from which your supplier purchases its energy.
- Energy usage: Obviously, the more energy you use, the more you pay. For reference, here’s our article on average electricity usage.
- Tariff: The better your tariff suits your energy use the less you will pay. For example, variable tariffs are ideal for those more active in the middle of the night, and export tariffs are ideal for those doing electricity arbitrage.
- Meter type: This is closely related to your tariff and defines how you’re measuring your energy use. Smart meters, day/night meters or pre-payment meters will measure your energy use differently.
Which of the ‘Big Six’ energy suppliers is the cheapest?
The cheapest of these large suppliers will depend on factors including location, annual usage, tariff and meter type.
You can use our home energy comparison service to find the cheapest energy supplier in the UK.