Fuse Energy launched in 2023, becoming the first new supplier to join the UK energy market after the energy crisis1. It was founded by former executives of the banking app Revolut and, alongside supplying energy, holds renewable generation assets, operating 18MW of solar and wind sites in the UK with profits intended for reinvestment in further renewable projects1.
The company began as an app-only supplier. It now also allows sign-up and account management online, though Which? states customers are likely to have a better experience in its app1. Its marketing has centred on low-price claims, including one of the UK's cheapest fixed tariffs and market-beating off-peak rates on its electric vehicle tariffs1. Up until recently it stated that its variable tariff beat the UK price cap and would always be cheaper than major UK suppliers. Which? reports that in June 2026 Fuse Energy said this is no longer the case and its variable rates are now priced at the Ofgem energy price cap level1.
"Up until recently it stated that its variable tariff beat the UK price cap, and would always be cheaper than major UK suppliers. However, in June 2026 it told us that this is no longer the case and its variable rates are now priced at the Ofgem energy price cap level."
2026 is the first year Which? has been able to include Fuse Energy in its rankings1. It scored 66% overall, made up of 76% in the customer survey and 56% in the supplier assessment1. In the customer survey it came joint fifth out of 17 energy companies, based on responses from 11,945 members of the public, with 112 Fuse Energy customers surveyed between September and October 20251. It received three stars for overall customer service, ease of contacting and value for money, but two stars for customer communications and for how well it communicated price changes1.
In the supplier assessment, covering September to November 2025, Fuse Energy came 13th out of 17 providers with 56%1. It scored four out of five for switching, six out of 12 for contacting your supplier and three out of 10 for help for customers who need it1. Which? attributes the low support score partly to the company's stage of growth, noting it had not signed up to Energy UK's Vulnerability Commitment at the time of assessment but has since done so1. It lacks traditional phone support; email and live chat are monitored 24/7, and Which? describes the self-help available on its website as limited1.
| Which? measure | Fuse Energy |
|---|---|
| Overall score | 66% |
| Customer survey score | 76% |
| Supplier assessment score | 56% |
| Ranking in supplier assessment | 13th of 17 |
| Sustainability assessment | 55% |
Fuse Energy does not accept prepayment meter customers1. Its main payment option is variable direct debit, billed for the previous month's usage, with fixed direct debit and open banking also available1. Which? states a prepayment meter might only be considered in unusual circumstances, such as repeated missed payments1. On sustainability, it scored 55% in Which?'s assessment, against a range of 0% to 85%, based on information supplied by companies in March 20261. It installs solar PV, battery storage, heat pumps, insulation and EV chargers for customers, and offers two time-of-use tariffs, one designed for EV drivers1.
Why it matters for households
A new entrant matters to household energy independence because it widens the field beyond the established suppliers, and Fuse Energy's arrival in 2023 was the first such addition after the crisis1. Its shift from claiming a variable tariff below the price cap to pricing at the cap level means the gap between its standard variable offer and the capped default rate has closed, so the saving once advertised on that tariff is no longer reported as available1. Its fixed tariff and EV off-peak claims are separate from that change1.
The practical differences for a home lie in how the account is run. There is no prepayment option, so households that rely on a prepayment meter cannot join1. Support is digital: no traditional phone line, with email and live chat monitored around the clock and limited website self-help1. Which? scored the supplier three out of 10 for helping customers who need it, which is the area most relevant to households in vulnerable circumstances1. Among surveyed customers, 16% had made a formal complaint in the past year, a higher proportion than many other suppliers, and the most common issues were problems getting a refund, estimated meter readings despite actual readings being provided, incorrect credit balances and broken in-home displays, each cited by 8% to 9%1.
What happens next
No dated next steps have been reported. Which? notes that Fuse Energy has since signed up to Energy UK's Vulnerability Commitment, after its assessment period1.
Sources1 cited
- Fuse Energy - Which?, which.co.uk