Fuse Energy, the London energy supplier founded by two former Revolut executives, has opened reservations for Jules, a plug-in solar and battery system it says can cut household bills by up to £330 a year.
It is the clearest sign yet of where a company valued at $5 billion in its third year wants to go next: from supplying your electricity to sitting inside your home.
Jules is aimed at people traditional solar has left out, such as renters and those living in flats. Reservations are open now, and Fuse expects first deliveries in 2027.
Who founded Fuse Energy?
Fuse was founded in 2022 by Alan Chang, its chief executive, and Charles Orr, both former Revolut executives, according to its investor Balderton.
Their approach echoes the fintech they came from: a supplier run largely through an app, with prices Balderton says sit around 10% below the big incumbents. Unlike most suppliers, Fuse also builds renewable sites, generates power, trades electricity and installs hardware itself.
"From source to socket, we are simplifying the entire energy system by bringing every stage in-house," Chang said when Fuse announced its latest funding round.
On its website, Fuse says it now supplies 450,000 UK homes and that its customers save £270 a year on average. It is an Ofgem-licensed supplier.
How much funding has Fuse Energy raised?
In December 2025, Fuse raised a further $70 million at a $5 billion valuation, in a round led by Balderton and Lowercarbon Capital. Balderton first invested at pre-seed in 2022, the year Fuse was founded.
BusinessCloud reported that QuantumLight, the venture fund linked to Revolut founder Nik Storonsky, joined the round. It also reported that Fuse had £300 million in annual recurring revenue at the time, eight times more than a year earlier, and was cash-flow positive.
Fuse plans to expand into Ireland, Spain and the US. At the time of the round, it said it would launch its own consumer hardware, including a small solar and battery system. Jules is that product.
What is Jules?
Jules is a home battery paired with solar panels that Fuse calls Anywhere Panels. Fuse's Jules page says the panels can be mounted on a balcony, a wall or the ground, and that the system suits a "backyard, balcony, or inside your flat".
Chang described the hardware on X as a 2.5kWh battery that plugs into a normal three-pin socket, with up to four 500W panels and no need for scaffolding or hard wiring. Fuse says installation is free and Jules comes with a 10-year warranty held directly by Fuse.
"Solar has been a club for homeowners with the right roof and eight grand to spare," Chang said in Fuse's launch announcement, as reported by Energy Digital. "It's the cheapest power in Britain, and the only things stopping most households using it are cost and complexity."
How does Jules save money?
Fuse describes three parts. The panels produce electricity your home uses as it is generated, so you buy less from the grid. The battery stores what you do not use straight away and releases it later, usually in the evening.
The third part is software, which Fuse calls autopilot. According to Fuse's launch announcement, Jules decides when to store and when to use power based on the solar forecast, your household's usage and live electricity prices.
It builds on the system Fuse already uses to bill customers against half-hourly wholesale prices. Fuse's marketing also says Jules learns your habits and "trades the excess", though its Jules page does not yet set out how trading will work.
How much could Jules save?
Fuse's headline figure is "up to £330 every year". Its own calculator gives a more specific example: Jules with two panels saves an estimated £181 a year, paying for itself in about three years and two months.
For comparison, the government estimates a standard 800W plug-in solar kit without a battery could save up to £110 a year.
For context, Ofgem's energy price cap rose 4% on 1 October, taking a typical dual-fuel bill to £1,723 a year.
How much does Jules cost?
Fuse's Jules page shows a price of £577 for Jules with two panels. That price includes a discount: Fuse offers "up to £600 off with a Fuse tariff", and the discount grows for every year you fix your electricity with Fuse, up to five years.
That is the business model in one line. The hardware discount rewards customers for staying on Fuse's tariff for longer.
Fuse compares Jules with rooftop solar, which it says typically costs £7,000 to £8,000 plus scaffolding.
Who else is chasing the plug-in battery market?
Octopus Energy is Fuse's most obvious rival. In June 2026 it announced its Nook range for 2027, including the Nook Cube, a 2kWh plug-in battery for renters and flats that can be expanded to 10.5kWh.
Octopus has spent years building its Kraken software business, which Bizztor has covered. Fuse's pitch with Jules is a single package of panels, battery and tariff from one supplier.
What can UK founders learn from Fuse?
Fuse shows what founders from one industry can do in another. Chang and Orr came from Revolut and built a supplier that reached a $5 billion valuation in its third year.
It also shows the value of owning more of the chain. Because Fuse generates, trades and supplies its own power, it can use hardware such as Jules to win and keep customers, rather than treating it as a separate business.
Bizztor's UK energy funding tracker follows funding for UK energy startups as home solar and batteries become a new battleground.
Bizztor covers UK startups and the founders behind them every week. Follow Bizztor on LinkedIn for the latest.
