Is Plug-in Solar Worth It in the UK?

How a plug-in solar panel saves money

A plug-in solar system is a single solar panel or two and a small inverter that plug directly into a wall socket, so the power feeds into your home's electrical system. How much energy you save comes down to one thing: every kilowatt-hour of electricity they make that you use straight away is one you don't buy from your energy supplier.

On the plug-in route there's no feed-in tariff, and for most owners no Smart Export Guarantee payment yet, so power your home doesn't use goes back to the grid and earns nothing. That's why the main question is when you use electricity, not which kit you buy.

The numbers in one go

The estimate from the Department for Energy Security and Net Zero, for an 800W kit with no battery, is £70 to £110 a year off your energy bill. The top of that range is modelled on panels tilted at 30 degrees and facing south, which is closer to a garden or flat-roof setup. Panels on a railing usually hang near vertical and often face east or west, so plan on the bottom of the range. Your electricity bill falls by what the panels generate and you use, at the electricity price you pay.

At the current price cap rate of 26.32p per kWh (the Ofgem cap rate for October to December 2026), saving £70 means using about 266 kWh of your own solar power in a year. Saving £110 means using about 418 kWh.

The government expects a plug-in solar panel kit to sell for £400 to £600. At £70 a year, a £500 kit pays back in about 7.1 years, and at £110 a year in about 4.5. The Compliant kits we track cost £399 to £989, and the cheapest of those pays back in about 5.7 years at £70 a year. Our guide to how much plug-in solar saves breaks the numbers down by region, and our Black Friday plug-in solar deals page lists checked prices for each Compliant kit.

What changed on 27 August 2026

Before 27 August 2026 there was no legal way to plug solar panels into a wall socket in Great Britain. SI 2026 No. 848 opened a plug-in route for small solar setups, and that's what makes this question worth asking now.

Three rules come with it. The kit has to be assessed Compliant on the ENA register, output is capped at 800VA, and you can run one plug-in solar system per household. You'll also need to register the device, which tells your network operator it's there.

Is plug-in solar worth it in the UK? Verdict by household

Home in the day: yes

If you work from home, you're retired, or you're home with young children, plug-in solar suits you best. The kettle, laptop, fridge and washing machine run while the panels are generating, so you'll use most of the solar energy you make. Run the washing machine and dishwasher in late morning and you'll push further up the range.

Out all day, every weekday: marginal

While you're out, the fridge and standby loads use only part of what the panels generate, and the rest goes to the grid for nothing. Payback then stretches well beyond the figures above. If that's you, a smaller, cheaper kit sized to your baseline load is a better buy than a big two-panel kit. A battery would fix the timing, but read the battery section first.

Renting: often yes, with permission

A plug and play solar panel kit comes with you when you move, which suits a renter better than any other kind of solar system. You'll need your landlord's permission first, and if you're a leaseholder you may need the freeholder's consent too.

Our plug-in solar guide for renters covers how to ask your landlord.

Flat with a sunny balcony: yes, at the low end

A south, south-east or south-west railing with no overhang is a good spot for solar panels. Expect the bottom of the government's range rather than the top. Check what your balcony is made of, because timber balconies and timber cladding are barred.

Garden, patio or flat roof: the best case

Ground and flat-roof mounts let you tilt two panels or one toward the sun, which is the setup the top of the government's range is modelled on. If you've got the space, this is where plug-in solar panels could earn the most.

North-facing or heavily shaded: probably not

Shade on even part of a solar panel cuts output more than direction does, and a north-facing solar panel makes too little to pay back in a sensible time. Check your shade and direction before you spend anything.

Northern Ireland: not on this route

The plug-in route covers Great Britain, under SI 2026 No. 848, in force since 27 August 2026. Northern Ireland has its own rules, and whether you can use a plug-in kit there is still unresolved.

Battery or no battery?

Battery storage holds daytime solar for the evening, which is what an out-all-day household needs. It also takes the solar and battery setup off the plug-in route, so you can't simply plug it in. A battery system needs a qualified electrician and a G98 notification to your distribution network operator, and the battery systems we track start at £659 before installation.

Add the electrician's bill and the payback becomes a different calculation. Read why batteries are excluded from the plug-in route.

Plug-in solar or rooftop solar?

If you own the house, have a good roof and use a lot of electricity, rooftop solar panels do more, because a plug-in kit is capped at 800VA of output and a full rooftop system isn't. Plug-in solar is for everyone else: flats, renters and UK homes where installing solar on the roof isn't an option.

A rooftop solar PV installation can also earn Smart Export Guarantee payments, which most plug-in owners can't yet.

Three checks before you buy

• Buy a Compliant kit. Only kits assessed Compliant on the ENA register are legal to use through a socket in Great Britain. Check the reference on our certification tracker.
• One device per household. You can run one plug-in device at a time, so put it on your sunniest wall or railing.
• Run your own numbers. The savings calculator uses your postcode, direction and habits.

Questions people ask