John Lewis, Currys, and B&Q are now stocking plug-in solar panels that you can mount on a balcony or garden and plug straight into a wall socket. The retail giants have backed Labour’s push to make solar generation accessible to the 80% of UK homes that lack rooftop panels, mostly flats and rented properties. As reported by GB News, the move is part of a wider government effort to double solar capacity by 2030. But what do these plug-in kits actually deliver for the household bill?
Who qualifies, and who doesn’t
Plug-in solar panels are aimed squarely at the 8.4 million UK households in flats or rented homes who cannot install a roof array. They cost £200 to £500 and plug into a standard 13-amp socket via a microinverter. No scaffolding, no electrician, no planning permission. Labour’s housing spokesperson told the BBC last month that the party wants “solar for renters, not just owners”. Yet the catch is that these panels typically generate 200 to 400 watts, enough to run a laptop and a fridge, but not a kettle, a washing machine, or a heat pump. On a sunny summer day, a 350W panel might save you about 15p on electricity. Over a year, that’s roughly £30–£50, assuming you’re home during daylight hours.
What it costs a typical 3-bed semi
A full rooftop solar array with 10 panels and battery storage costs £7,000–£10,000 after the 0% VAT rate. It can cut a typical 3-bed semi’s annual electricity bill by 60–70%, or about £500–£700, and improve your EPC rating by up to two bands. Plug-in panels do none of that. They are not eligible for the Smart Export Guarantee, meaning you cannot sell surplus power back to the grid, and they do not count toward an EPC assessment, because the Energy Performance Certificate requires a fixed installation that meets MCS or equivalent standards. For a homeowner looking to sell or rent, plug-in solar is invisible to the EPC.
The safety and grid compliance question
Ofgem and the Energy Networks Association have warned that some plug-in panels lack G98 or G99 certification, which ensures the microinverter does not back-feed power onto the grid when there’s a local power cut, a risk to engineers. The electrical safety charity Electrical Safety First has called for mandatory registration of all plug-in solar devices. The retailers backing Labour’s push have said they will only stock models with the relevant certification, but the wider market on Amazon and eBay is unregulated. Buyers should look for the “G98” or “G99” label on the microinverter, or stick to brands sold through the big retailers that have confirmed compliance.
What to do, and by when
If you rent or live in a flat and want to offset your daytime electricity use, a single plug-in panel on a south-facing balcony can be a reasonable £300 experiment. But do not expect it to replace a full array. For homeowners with roof space, a proper 4kW system with battery remains the far better financial and EPC play. The government’s 0% VAT on solar installations runs until March 2027. Labour has said it will extend the scheme if elected, but no date is confirmed. The smart move: check your EPC rating now, get quotes from MCS-certified installers, and compare the cost per kWh saved. Plug-in solar is a gadget. Rooftop solar is an asset.
Frequently Asked Questions
No. A typical plug-in panel generates 200–400W, enough for small appliances like a fridge or router. To power a kettle, washing machine, or heat pump you need a full rooftop array of at least 3–4kW.
No. EPC assessments only recognise fixed solar installations that are MCS-certified and permanently wired. Plug-in panels are not counted, so they won't help if you're selling or renting.
