The price cap will rise by £63 in October, the third increase this year. Against that backdrop, Currys and B&Q have joined government talks to sell plug-in solar panels, as reported by Retail Gazette. The idea is simple: a panel, an inverter, and a plug that goes straight into a wall socket. No electrician. No scaffolding. No planning permission. For the 8.5 million UK households that cannot install rooftop solar, because they rent, live in a flat, or have a shaded roof, this sounds like a lifeline.
Who qualifies, and who doesn’t
The government talks, confirmed by the Department for Energy Security and Net Zero, aim to create a new product safety standard for plug-in solar. That matters because current models sold online often lack UK certification. Once a standard is in place, B&Q and Currys can stock them with confidence. But the catch is this: plug-in solar is not a full rooftop replacement. A typical 300-watt panel generates roughly 250 kWh per year in the UK, enough to run a fridge-freezer and a few LED lights. That is about £50–£100 off your annual bill, depending on your tariff. For a home that uses 3,000 kWh a year, that is a 2–3% saving.
What it costs a typical 3-bed semi
Prices for plug-in solar kits range from £300 to £800, depending on wattage and build quality. B&Q currently sells a 200-watt kit for £399; Currys lists a 300-watt system at £599. Installation is trivial, you mount the panel on a balcony, garden frame, or wall, and plug it into a socket with a built-in inverter. No electrician needed. But the economics are tight. At £599 for a 300-watt system saving £75 a year, the payback period is eight years, assuming the panel lasts that long. Most plug-in panels come with a 5-year warranty. If it fails after six, you are out of pocket. By contrast, a full 4 kW rooftop array costs £5,000–£7,000 but saves £500–£700 a year and qualifies for the Smart Export Guarantee, which pays you 15p per kWh exported. Plug-in solar does not qualify for that scheme, because it is not wired into your consumer unit. Ofgem confirmed this to Which? last year: only MCS-certified installations can export to the grid.
EPC impact, don’t expect a band jump
Energy Performance Certificates measure the fabric of your home, insulation, glazing, heating system. A plug-in solar panel is treated as a portable appliance, not a fixed installation. The government’s Standard Assessment Procedure (SAP) gives it zero points unless it is permanently wired in. That means no EPC improvement for renters or flat-dwellers who install one. For homeowners trying to push from band E to D, this will not help. The Energy Saving Trust advises: “Plug-in solar panels are best seen as a way to reduce your electricity bill, not as a route to a better EPC.”
The real-world action: what to do now
If you are a homeowner with a suitable roof, a full rooftop array with battery storage remains the better long-term bet. The Boiler Upgrade Scheme offers £7,500 off a heat pump, but nothing for solar alone. However, if you rent, live in a flat, or have a north-facing roof, a plug-in panel from B&Q or Currys might be worth the punt, provided you buy one with UK certification and a decent warranty. Wait until the new safety standard is published (expected early 2025), then compare models on Which? and the Energy Saving Trust website. Do not expect a quick EPC fix. Do expect to shave a few quid off your bill. And do not plug it into a multi-socket extension lead, that is a fire risk. The government talks are a sign that plug-in solar is going mainstream, but the fine print matters more than the headline.
Frequently Asked Questions
No. Plug-in solar panels are not MCS-certified and do not qualify for the Smart Export Guarantee. You can only use the electricity you generate yourself. Any excess is wasted unless you store it in a battery.
Typically no. The government's SAP methodology treats plug-in panels as portable appliances, not fixed installations. Unless permanently wired into your consumer unit by an electrician, they do not count toward an EPC assessment.
