Ed Miliband wants to see plug-in solar panels on shelves at Lidl by this summer. That was the headline-grabbing pledge from the Energy Secretary in January 2025, a plan to let households buy a 350W panel, plug it into a wall socket, and start cutting bills without an installer or scaffolding. Six months on, the scheme is stuck on safety.
As reported by This is Money, safety concerns have emerged as the main sticking point. The worry is that a miswired plug-in panel could feed power back into the grid during a power cut, endangering linesmen. There are also questions about whether UK homes’ ring mains can safely take the current.
Why the appeal, and why it might not help your EPC
For a typical 3-bed semi using 3,500 kWh a year, a single 350W plug-in panel might shave £80–£120 off the annual bill, assuming decent daylight. That’s real money. The upfront cost could be £500–£1,000, far less than a full rooftop array, which runs £5,000–£7,000 after the 0% VAT rate.
The catch is EPC impact. Energy Performance Certificate assessors only score fixed, MCS-certified installations. A plug-in panel that can be unplugged and taken to a new house doesn’t count. Your EPC rating stays the same. That matters if you’re selling or letting, a D-rated property costs more to market than a C-rated one.
Ofgem’s data shows that a single EPC band improvement adds roughly 1.5% to a property’s sale value. On a £300,000 house, that’s £4,500. A plug-in panel won’t get you there.
Who qualifies, and who doesn’t
The government’s plan targets renters and flat-dwellers who can’t install roof panels. That’s about 4.5 million households, according to the Energy Saving Trust. For them, a plug-in panel is the only option to generate their own power.
But the safety rules are tight. The plug-in units must include an inverter that isolates the panel from the grid when mains power drops, a feature called ‘anti-islanding’. Some cheap imports don’t have it. The UK’s plug-in solar standard, PAS 63100, was only published in August 2024. It’s not legally binding yet, but the government wants all retail units to comply.
Lidl and other supermarkets are reportedly reluctant to stock panels without a clear liability framework. One industry source told This is Money that ‘a great deal of work’ remains on certification and insurance.
What it costs a typical 3-bed semi, and what you should do now
If you’re a homeowner with a south-facing roof, a full MCS-certified solar array is still the better bet. The Smart Export Guarantee pays you for surplus power, currently 5–15p per kWh, depending on your supplier. A plug-in panel doesn’t qualify for the SEG unless it’s registered with an MCS-certified installer, which defeats the DIY purpose.
For renters and flat-dwellers, a plug-in panel could still be worth it, but only if you buy from a UK supplier that complies with PAS 63100. Check the product has a G98 or G99 grid-tie certificate from the Energy Networks Association. Without it, you risk invalidating your home insurance.
The government has not announced a firm launch date. The summer 2025 target looks increasingly optimistic. In the meantime, the best move for most households is to get a quote for a full rooftop installation through the Energy Saving Trust’s tool. The 0% VAT on solar panels is guaranteed until March 2027. That’s a bird in the hand.
Households on standard variable tariffs can apply for the Great British Insulation Scheme now. It’s free for low-income homes and covers loft and cavity wall insulation, a quicker route to a warmer house than waiting for a plug-in panel that may never hit the shelves.
Frequently Asked Questions
A plug-in solar panel typically costs between £500 and £1,000 in the UK, which is far less than a full rooftop array that runs £5,000–£7,000 after the 0% VAT rate. For a typical 3-bed semi using 3,500 kWh a year, a single 350W panel could save £80–£120 annually on electricity bills.
Safety concerns have delayed the rollout of plug-in solar panels in the UK, mainly because a miswired panel could feed power back into the grid during a power cut, endangering linesmen. The UK's plug-in solar standard, PAS 63100, published in August 2024, requires 'anti-islanding' features to isolate the panel from the grid, but it's not yet legally binding.
No, a plug-in solar panel won't improve your Energy Performance Certificate rating because EPC assessors only score fixed, MCS-certified installations. Since a plug-in panel can be unplugged and moved, it doesn't count, which matters if you're selling or letting your property.
The Smart Export Guarantee pays 5–15p per kWh for surplus power, but a plug-in solar panel doesn't qualify unless it's registered with an MCS-certified installer, which defeats the DIY purpose. For renters and flat-dwellers, it's still worth buying a UK-compliant panel with a G98 or G99 grid-tie certificate.
Plug-in solar panels are aimed at the 4.5 million UK households, including renters and flat-dwellers, who can't install roof panels. However, you must buy from a UK supplier that complies with PAS 63100 and has a G98 or G99 grid-tie certificate to avoid invalidating your home insurance.
