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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** |
|---|---|---|---|
| Utility Warehouse | 69% | 80% | 75% |
| Octopus Energy | 74% | 72% | 73% |
| Ecotricty Energy | 71% | 72% | 72% |
| E | 71% | 71% | 71% |
| Utilita | 67% | 71% | 69% |
| Out Fox the Market | 69% | 67% | 68% |
| Co-op Energy | 63% | 72% | 68% |
| Sainsbury's Energy | 69% | 63% | 66% |
| EDF Energy | 55% | 66% | 61% |
| EON Next | 55% | 67% | 61% |
** “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? 2024 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 Utility Warehouse
Utility Warehouse claimed the top spot in the 2024 Which? energy survey with a total score of 75%. Known for bundling services like broadband, mobile, and home insurance with energy, the company excelled in customer service, bill clarity, and value for money. However, despite its high score, Utility Warehouse is not a Which? Recommended Provider due to its customer score of 69%, which falls just below the threshold for recommendation.
#2 Octopus Energy
Octopus Energy, a Which? Recommended Provider for multiple years, secured second place with a total score of 73%. 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.
#3 Ecotricity
Ecotricity ranked third with a total score of 72%, earning the status of a Which? Recommended Provider. Ecotricity excelled in customer satisfaction and value for money because of its pioneering approach to green energy. It continues to champion sustainability and renewable energy generation.
#4 E
E, a pay-as-you-go energy supplier, achieved a total score of 71%, earning it the distinction of a Which? Recommended Provider. 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.
#5 Utilita
Utilita, specialising in pay-as-you-go prepayment smart meters, came in fifth with a total score of 69%. 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.
#6 Outfox the Market
Outfox the Market secured sixth 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.
#7 Co-op Energy
Co-op Energy, powered by Octopus Energy, ranked seventh with a total score of 68%. 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.
#8 Sainsbury’s Energy
In partnership with E.ON Next, Sainsbury’s Energy achieved eighth place with a total score of 66%. Customers appreciate its integration with Nectar points, but its scores were average across most survey categories.
#9 Shell Energy
Shell Energy ranked ninth in the survey with a total score of 65%. Known for offering bundled services like broadband alongside energy, it provided convenience but received mixed reviews for customer service and value for money. As of 2025, Shell Energy is no longer an energy supplier, with its customer accounts transferred to Octopus Energy.
#10 EDF Energy
EDF Energy rounded out the top 10 with a total score of 61%. 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 2024, Utility Warehouse ranked first in the Which? energy survey Excellent in customer service, clarity of bills, and value for money.
Octopus Energy remains a standout as a Which? Recommended Provider. Known for its exceptional customer service, complaint handling, and overall customer satisfaction, Octopus Energy continues to set the standard for customer-focused energy supply.
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 2024 rating in Which?’s Best Energy Supplier 2024 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.