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Best energy suppliers in 2025
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 2025.
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 2025:
| Energy Supplier | Customer satisfaction score* | Which? Assessment score** | Overall Score** |
|---|---|---|---|
| Octopus Energy | 78% | 70% | 74% |
| Utility Warehouse | 73% | 70% | 73% |
| Utilita | 68% | 73% | 71% |
| 100 Green | 76% | 65% | 70% |
| E | 64% | 76% | 70% |
| Co-op Energy | 69% | 70% | 70% |
| Out Fox the Market | 70% | 66% | 68% |
| Ecotricty Energy | 68% | 66% | 70% |
| Sainsbury's Energy | 72% | 64% | 56% |
| EDF Energy | 62% | 62% | 62% |
** “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? 2025 customer survey data
Top 10 energy suppliers in 2025
The 2024 Which? energy survey 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 2025:
#1 Octopus Energy
Octopus Energy, a Which? Recommended Provider for multiple years, secured first place with a total score of 74%. It performed exceptionally well in customer satisfaction, bill clarity, and its support for vulnerable customers. Octopus Energy is widely recognised for its commitment to renewable energy and innovative customer-focused services.
#2 Utility Warehouse
Utility Warehouse claimed the second spot in the 2025 Which? energy survey with a total score of 73%. Known for bundling services like broadband, mobile, and home insurance with energy, the company excelled in customer service, bill clarity, and value for money. Utility Warehouse is now a Which? Recommended Provider due to its customer score of 70%.
#3 Utilita
Utilita, specialising in pay-as-you-go prepayment smart meters, came in third with a total score of 70%. The company scored particularly well for the clarity of its communication and support for vulnerable customers. Utilita focuses on helping households reduce energy consumption through its innovative services.
#4 100Green
In 2025, 100Green emerged as a new contender in the top 10 energy companies, earning a 70% score in the Which? survey. The company received four-star ratings across all customer service categories and was recognized as a Which? Recommended Provider. However, it scored lower in supporting vulnerable customers, as it has not signed the Energy UK Vulnerability Commitment.
#5 E
E, a pay-as-you-go energy supplier, achieved a total score of 70%. E is highly regarded for its value for money, customer service, and participation in Energy UK’s Vulnerability Commitment, which ensures support for customers in need.
#6 Co-op Energy
Co-op Energy, powered by Octopus Energy, ranked sixth with a total score of 70%. The company scored well in customer service and value for money but received average marks for clarity of statements. Co-op Energy offers a range of energy solutions tailored to customer needs.
#7 Outfox the Market
Outfox the Market secured seventh place with a total score of 68%. It performed well in the accuracy of payments and value for money, making it a popular choice among cost-conscious customers.
#8 Ecotricity
Ecotricity, previously ranked third, has dropped to eighth in the latest Which? survey. The company received a customer score of 68% and a Which? assessment score of 66%, resulting in an overall score of 70%. Despite this decline, Ecotricity continues to champion sustainability and renewable energy generation.
#9 Sainsbury’s Energy
Sainsbury’s Energy, in partnership with E.ON Next, secured a total score of 56% in the latest Which? survey. Customers appreciate its integration with Nectar points, and the company received four-star ratings for value for money, clarity of statements, and accuracy of payments. However, it scored lower in the Which? assessment, particularly in areas such as customer service and complaints performance.
#10 EDF Energy
EDF Energy rounded out the top 10 with a total score of 62%. As the UK’s largest electricity supplier by volume, it performed well in support of vulnerable customers but received average marks for customer satisfaction and complaint resolution.
Which energy supplier has the best customer service?
In 2025 Octopus Energy topped the latest Which? survey. Praised for its excellent customer service, it received five-star ratings across multiple categories and performed well in supporting vulnerable customers.
Utility Warehouse followed in second place. Customers rated it highly for customer service and value for money, with strong scores for complaint handling and support for those in need.
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 of 2024 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 currently the best energy supplier?
As we mentioned above, the “best” energy supplier depends on the needs of each customer.
However, our research suggests that Octopus Energy is overall the best as it took the top 2025 rating in Which?’s Best Energy Supplier 2025 survey.
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.