Fuse Energy

Fuse Energy launched in 2023, becoming the first new supplier to join the market after the energy crisis.

It was founded by former executives of banking app Revolut and, as well as supplying energy to customers, has a focus on renewable energy assets. It already operates 18MW of solar and wind sites in the UK, and has a pipeline to reinvest its profits into more renewable projects.

It originally launched as an app-only energy supplier. It does now also let you sign up and operate your account online, but you're likely to get a better experience through its app. 

Like many challenger brands, low price claims are a big part of its marketing. It says its variable tariff beats the UK price cap, so that it will always be cheaper than major UK suppliers. It also claims to offer one of the UK's cheapest fixed tariffs, and market-beating off-peak rates for its EV tariffs. 

Compare energy prices using our free tool to see if you could spend less.

Fuse Energy score 

We combine the results of our customer survey with an in-depth assessment of companies' behind-the-scenes practices and policies to give you an overall view. 

2026 is the first year that we have been able to include Fuse Energy in our rankings. 

Take a look at our table below to see our score breakdown for Fuse Energy:

Here's how Fuse Energy's customer and policy assessments break down:

Find out how Fuse Energy compares with other energy suppliers: see our full results of the best energy suppliers.

Which? verdict on Fuse Energy

• Pros: A good customer score in our satisfaction survey, with an appreciation for its eco-focus
• Cons: Some disappointing scores in our supplier assessment, especially for supporting customers that need it

Fuse Energy customer review

Fuse Energy came joint 5th out of 17 energy companies rated by 11,945 members of the public in the annual Which? customer survey.

Customer ratings suggest that customers are moderately happy with Fuse Energy as a supplier. It achieved three stars for most of the categories we looked at, including overall customer service, ease of contacting, and value for money. However it only got two stars for customer communications generally, and specifically how well it communicated price changes to its customers. 

Feedback from customers was mixed. One happy customer said: 'I’m satisfied with Fuse Energy because they offer fair pricing, transparent billing, and a modern, eco-focused service that’s easy to manage through their intuitive app.'

Other customers were less content, with some finding the communication methods limited. One said: 'Communication is difficult as there is no option of a telephone call'. 

Fuse Energy customer service

Fuse Energy received a satisfactory three stars in our survey for its customer service. No suppliers received the full five stars, and only our Which? Recommended Providers - E (Gas & Electricity), Octopus Energy, 100Green, and Sainsbury's Energy - got four stars.

Fuse Energy common issues and complaints

When we asked Fuse Energy customers about issues they'd experienced with their supplier over the previous year, the most common issues were problems getting a refund (9%), the supplier estimating meter readings when actual readings had been provided (8%), accounts displaying an incorrect credit balance (8%), and broken in-home displays/monitors (8%). 

Overall, 16% of Fuse Energy customers said they contacted their supplier to make a formal complaint in the past year. This is a higher proportion than many other suppliers, though most customers said they found it easy to make their complaint. 

Fuse Energy supplier assessment

In September-November 2025 we looked at five aspects of suppliers' business practices and procedures. Examples of some criteria within each category are shown below:

• 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.

We did this using a combination of the responses to a survey we sent to suppliers and our own assessments.

Fuse Energy came 13th out of 17 providers in our assessment with a supplier score of 56%. 

Fuse did pretty well in our switching assessment, with four out of a possible five. But it only got six out of 12 for contacting your supplier, mainly because it doesn't have traditional phoneline support, which might not suit some people. That said, if you're happy to manage your account digitally, its email and live chat are actively monitored 24/7 - though the self-help available on its website is limited. 

It also received three out of 10 for its support for those that need it. Fuse is a new supplier that is growing rapidly, and so it doesn't yet have some of the support in place that other more established suppliers have. It is not signed up to Energy UK's Vulnerability Commitment.   

Can you join Fuse Energy with a prepayment meter?

No. Fuse Energy's main payment option is through variable direct debit. The amount that will be debited each month is for the energy you've used in the previous month. 

Fuse Energy also allows you to  pay via open banking, but it doesn't accept payments by any other means, such as fixed direct debit, payment on receipt of a bill, or prepayment. 

Only in unusual circumstances – for example if you repeatedly miss energy payments – might Fuse Energy consider asking you to install a pre-payment meter. 

Find out whether prepayment energy is right for you.

Fuse Energy's sustainability credentials

Sustainability credentials are important when choosing an energy supplier for two thirds of those responsible for choosing their provider. That’s according to our online survey of 3,000 UK adults in August 2024. 

So we factor in a range of sustainability criteria in our Eco Provider assessment. 

Here's how Fuse Energy fared:

• Proportion of renewable electricity sold to customers: 0.2%. 
• Generates renewable electricity from the 18MW of wind and solar sites in the UK. 
• Reinvests its profits into renewable projects around the world. 
• Offers Economy 7 time-of-use tariffs
• Installs solar pv and EV chargers for customers.

Find out more about the differences between energy companies’ renewable electricity, and find out how we assessed energy suppliers for sustainability. 

Based on information supplied by companies in August 2024 and their most recent published fuel mixes, where available. 

Making your home more energy efficient will save money on your bills in the long term and lower your carbon footprint. Get started with our guides to home energy efficiency.