Fuse Jules: UK's First Plug-In Solar With a Battery

Fuse Energy Jules is the first plug-in solar system in the UK to bundle a battery. The London-based supplier announced it on 20 October 2026: up to four 500W panels that connect to a standard socket, plus a 2.5kWh battery managed by an app. You can join the waitlist now, but you cannot buy or install one yet, because plug-in batteries are not yet legal in the UK. Here is what Fuse has said, what is still unconfirmed, and how it compares with the rest of the plug-in market.

What Fuse has announced

According to Energy Digital and TechRadar, the headline details are:

• Panels: up to four 500W panels, a combined 2,000W of panel capacity, plugged into a standard socket.
• Battery: an included 2.5kWh battery. The Fuse app decides when to store power and when to draw it back, using solar forecasts, household usage and live prices.
• Price: Fuse says Jules will cost £577 once it goes on sale. Fuse has not said what that price covers (for example how many panels), so check this before you commit to a place on the waitlist.
• Saving: Fuse says around £180 a year on electricity bills, which would pay the system off in a little over three years.
• Timing: first deliveries are "expected post legislation approval in 2027".

For comparison, Fuse puts a standard rooftop solar installation at £7,000 to £8,000 before scaffolding and installation costs, which is the gap plug-in kits are trying to fill.

Why you cannot buy it yet

Plug-in solar panels only became legal to sell in Great Britain in August 2026, but the rules cover panels, not batteries. TechRadar reports that the panel-and-battery combination is not yet legal in the UK, which is why Fuse is taking pre-orders and waiting list sign-ups rather than shipping. The legislation Fuse is waiting on has not been passed, so the 2027 delivery estimate depends on it. Our plug-in battery safety study explainer covers the safety work behind that delay, and our plug-in balcony solar guide explains what is already allowed today.

Is the £180 a year saving realistic?

It is Fuse's own estimate, and it assumes the system runs as designed, so treat it as a marketing figure rather than a guarantee. A few things decide whether you would get near it:

• The battery adds real value. A plug-in kit without storage only helps while the sun is shining, and any surplus generation that your home is not using at that moment is exported. A 2.5kWh battery lets you shift some of that daytime generation into the evening, when electricity is dearest.
• Size matters. 2.5kWh is small. A typical home uses several times that in a day, so the battery will cover base load and evening peaks, not a whole day.
• Season matters. October is not the best month to judge solar, and output in December and January is a small fraction of summer.

The payback maths is simple: £577 divided by £180 a year is about 3.2 years, which matches what Fuse says. If real savings came in at half the claim, payback would roughly double. Until the price, the contents and the legal position are confirmed, treat the figure as indicative only.

How Jules compares with Octopus

Octopus Energy sells plug-in solar now, at £450 for one panel or £650 for two, but without a battery. TechRadar reports that Octopus is planning plug-in batteries called the Nook Cube (2kWh) and Nook Colossus (5kWh or 10kWh, expandable to 30kWh), also due in 2027. Our Octopus plug-in solar review covers the hardware that is on sale today. So Fuse is not alone: the first battery-equipped plug-in systems look set to arrive together, once the rules allow.

Should you join the Jules waitlist?

Joining a waitlist or pre-order list costs nothing in itself, but check whether a deposit is required, as the coverage does not say. If you want to cut bills this winter, a legal plug-in panel kit is available today, and a battery can be added later when the rules and products settle. If you are weighing a full roof system instead, the cost and savings picture is very different, and a plug-in kit is not a substitute for a roof installation.