Plug-in solar panels in the UK: rules, costs and realistic savings

Plug-in solar panels are small solar kits that you plug into an ordinary socket. While the sun shines, they feed electricity into your home's wiring, so appliances that are running draw less from the grid. They have been legal to buy and use in Great Britain since 27 August 2026, as long as the kit meets the government's safety specification, puts out no more than 800 W, has no battery, and you notify your network operator.

Repricing the government's two worked examples at the October to December 2026 price cap, an 800 W kit cuts the electricity bill of a household that uses 3,323 kWh a year and is home during the day by about £72 to £113 a year (the government's own figures, at the July to September cap, were about £70 and £110). That holds whichever supplier you use, because export payments for plug-in kits are not established: the export tariffs we checked need MCS or equivalent certification. Where you mount the panels and how much electricity you use in daylight make most of the difference. The workings are below.

How plug-in solar works

A plug-in kit has one to four solar panels, a small inverter and a cable with a standard three-pin plug. The panels make direct current (DC). The inverter turns it into the alternating current (AC) your home uses and feeds it through the socket into your wiring. Some kits build the inverter into the panel; others supply it as a separate box.

The kit's output is used first by whatever is switched on in your home at that moment: the fridge, the router, a laptop charging, the washing machine. You buy less from your supplier for as long as the kit is producing. If the panels produce more than your home is using, the surplus flows out to the grid. At the moment you are unlikely to be paid for it (see export payments below).

Two numbers on the box matter:

• 800 W is the maximum AC output, not what you get all day. The legal limit applies to the inverter's rated output. The panels can add up to more on paper: the specification allows up to 2,000 W of panel power per kit, but the output into your home is still capped at 800 W. Above 960 W of panels, manufacturers must advise you to consider having your electrical installation checked by a professional first. We recommend having that check.
• Energy over a year is what saves money. In an estimate from the EU's PVGIS solar database for Birmingham, 800 W of south-facing panels tilted at 30° produce about 768 kWh a year. That is the same energy as running at full power for about 960 hours, or an average of roughly 88 W across the whole year. Output is high on sunny summer middays and close to zero on dull winter days.

A plug-in kit also stops working in a power cut. Like any grid-connected solar system, it is designed to switch off when the mains supply fails, so it cannot back up your home.

Is plug-in solar legal in the UK?

Yes, in Great Britain, from 27 August 2026. The legal change was made on 16 July 2026 and amends the plug and socket safety rules and the electricity network safety rules. It allows a "plug-in microgenerator" that:

• turns sunlight directly into electricity;
• has a maximum rated AC output of no more than 800 W;
• connects to your home through a standard plug and socket and runs alongside the electricity network;
• is not designed to take electricity from your home to store it for later; and
• complies with the government's Plug-in Solar Device Interim Product Specification, version 2, published on 16 July 2026.

Three limits follow from this.

No batteries. Plug-in batteries and kits with a built-in battery are outside the legal route. The government has said it will keep the evidence under review, but for now they are not covered.

One kit per household. The specification would allow one kit per electrical circuit protected by its own circuit breaker. Until the network connection rules (Engineering Recommendation G98) are amended, however, the limit is one plug-in device per household.

Great Britain only, for now. The plug and socket change covers the whole UK, but the network safety change covers England, Wales and Scotland only. The government's impact assessment said plug-in solar could only be used legally in Northern Ireland once Northern Ireland's own electricity safety regulations are changed, which is a matter for the Northern Ireland Executive. We have not found that change. If you live in Northern Ireland, check with NIE Networks before buying.

You do not need an electrician to hard-wire a compliant kit: the law creates a route for plugging it into a normal socket. You should still ask a qualified electrician to look at your wiring if it is old or if you have any doubt about the socket or circuit you plan to use.

Check the kit before you buy

The rules put most safety duties on the manufacturer, so the kit you choose does much of the work for you. Check these points on the listing or ask the retailer before paying.

Is it on the ENA Type Test Register?

Manufacturers must register each device on the Energy Networks Association's Type Test Register and get confirmation that it is compliant before selling it. A device that has only been submitted for registration does not count. The register is public and needs no login: it is now part of the ENA's Connect Direct service. Filter by the type "Plug-in Solar" and check that the kit's brand and model name match a record marked "Compliant". On 23 September 2026 it listed 79 plug-in solar records from 24 brands, 70 of them marked Compliant. If you can't find the kit, ask the seller which record it is. The kit and its documentation must also say that it complies with the Interim Product Specification.

What exactly is in the box?

A compliant kit includes the panels, the inverter, the cable and plug, and a mounting system designed for the surfaces it names. Mountings that rely only on cable ties, rope, straps, bungee cords or tape are not allowed. The kit must also come with a label to stick at or near your consumer unit (fuse box), so anyone working on your electrics knows a generator is connected.

What does it cost, including VAT?

Kits bought off the shelf carry 20% VAT. The 0% VAT rate for solar panels applies only when an installer supplies and fits them in your home, and a plug-in kit is sold without installation. As one example, on 23 September 2026 Screwfix listed an 800 W kit with two 460 W bifacial panels and an 800 W micro-inverter at £669 including VAT. On the same day the register listed one PowerXpress plug-in solar record, marked Compliant; check that its model name matches the kit before you buy. For comparison, the government's impact assessment found 800 W systems selling for around £400 to £600 or less in Europe, before any installation or other costs. Retailers including Currys, B&Q, Screwfix, Amazon, Argos and Wickes told the government they would stock plug-in kits. Our plug-in solar kits guide compares the kits on sale.

What guarantee comes with it?

Guarantees vary widely. The kit in the example above listed a one-year manufacturer guarantee. Check how long the panels and the inverter are each covered, and who handles a claim.

Before you plug in: a checklist

Work through this list before you buy and again before you connect the kit.

• Compliance. The kit's brand and model appear as "Compliant" under "Plug-in Solar" on the ENA's Connect Direct register, and the kit is labelled as meeting the Interim Product Specification.
• No battery. The kit has no built-in battery and you will not connect one.
• One kit. Nobody else in your household already runs a plug-in kit.
• Permission. You have written consent from your landlord, freeholder or managing agent if you need it, and you have checked planning rules.
• Surface. The spot is not timber cladding, a timber balcony, or a building with cladding or wall remediation work.
• Socket. You have an undamaged wall socket you can reach without an extension lead or adaptor, and a safe route for the cable.
• Wiring. The circuit is protected by a modern RCBO, as the kit's instructions explain, or an electrician has checked and, where needed, upgraded older fuse protection.
• Panel power. If the panels total more than 960 W, an electrician has assessed your wiring.
• Insurance. Your home insurer, and the building's insurer if you live in a flat, have confirmed cover.
• Notification. You know how to notify your network operator, as the kit's instructions explain.

Where to put the panels

Choose the spot for its sunlight first, then check you are allowed to use it.

Sun and angle. South-facing panels in full sun produce the most. Shade from trees, balconies above or nearby buildings cuts output sharply. Tilt matters too. Using PVGIS for Birmingham, 800 W of south-facing panels produce about 768 kWh a year when tilted at 30°, against about 568 kWh when mounted flat against a wall. That is about a quarter less over the year. The vertical panels do slightly better in December (about 32 kWh against 25 kWh) because the winter sun is low, but the summer loss is far bigger. East- or west-facing panels spread output across the morning or afternoon.

Permission from the owner. If you rent, or own a leasehold flat, you will usually need permission from your landlord, freeholder or managing agent before fixing anything to the outside of the building. The kit's instructions must remind you to get it, and to agree who pays for any costs. Get the answer in writing.

Planning. Panels standing loose on the ground or a table are treated differently from panels fixed to a building. The government's impact assessment notes that permanently attaching plug-in panels to a wall, balcony or similar structure is development that falls under planning controls. In England, the permitted development rules changed on 27 August 2026:

• solar panels on a house wall or balcony can stick out up to 0.4 metres, or 0.2 metres where the wall or balcony is next to a highway (a road or public path);
• plug-in solar is not permitted development on a wooden wall, balcony or enclosure, or on any part of a house or block of flats clad in timber;
• permitted development does not apply to listed buildings; in conservation areas and World Heritage Sites, it does not cover a wall, balcony or roof enclosure that fronts a highway (a road or public path).

Scotland, Wales and Northern Ireland have their own planning rules. Check with your council before fixing panels to a building, and read our planning permission guide.

Surfaces the specification rules out. Whatever the planning position, kits must not be installed on aluminium or metal composite cladding, high-pressure laminate cladding, timber cladding, timber balconies, or on buildings under external wall or building safety remediation.

Fixing it securely. Follow the manufacturer's maximum installation height and wind-load limits. Place the kit where it cannot fall, block an escape route or endanger neighbours or passers-by, and use the cable route the instructions describe to bring the lead indoors without damage. Don't fix panels from a ladder at height or on a roof yourself; if the only sunny spot needs that, use a professional.

Insurance. Before installing, check whether the kit affects your home insurance, and the building's insurance if you live in a flat. Retail listings are already telling buyers to confirm cover with their insurer first.

Plug it in safely

The kit's plug is designed so that its pins cannot carry a dangerous voltage once you pull it out, and the inverter shuts down quickly when the plug is removed or the mains supply fails. Your part is to use it the way the specification assumes.

• Plug straight into a wall socket. Extension leads, multi-way adaptors, travel adaptors, RCD adaptors and plug converters are not allowed. The plug itself carries a warning against extension leads and adaptors.
• Unplug before touching the DC side. Pull the mains plug before you disconnect any panel (DC) connector, and never disconnect DC connectors while the panels are producing.
• Use a sound socket. Do not connect to a damaged, scorched or loose socket. If you have any doubt about its condition or your wiring, have a qualified electrician inspect it first.
• Check your protective devices. Before connecting, check that the circuit is protected by a modern RCBO (a combined circuit breaker and residual current device), as the kit's instructions explain, and fit the label near the consumer unit. If your consumer unit still has older fuses, have an electrician check it and upgrade it where needed. Once the kit is running, press the RCBO's test button from time to time while the kit is producing power; if it doesn't trip straight away, call an electrician.
• Keep to one kit. Only one plug-in device per household is allowed until G98 is amended.
• If you already have solar panels or a battery, ask your network operator before adding a plug-in kit. The connection rules count the combined output of every generator and battery inverter at your home. Above 16 amps per phase, which is 3.68 kW on a normal single-phase supply, the operator's approval is needed before connection.
• Don't modify it. Change or replace parts only as the manufacturer's instructions allow, and never add a battery.

Tell your network operator

Notifying your distribution network operator (DNO) is mandatory, both when you connect a plug-in kit and when you stop using it. Your DNO is the company that runs the local power lines in your area. It is not your energy supplier. Every compliant kit must carry a statement that notification is mandatory and include a link to instructions on how to do it, so follow the route in your kit's documentation.

Notification lets the network operator know where small generators are connected so it can manage the local network safely. It does not register you for export payments.

How much can plug-in solar save?

Plug-in solar saves money only on the electricity your home uses at the moment the panels produce it. Each of those kilowatt-hours (kWh) is one you don't buy from your supplier. Surplus that flows to the grid earns nothing unless you have an export tariff (see below). Your daily standing charge stays the same.

The government's impact assessment published two worked examples for a household using 3,323 kWh a year that is home during the day, with 800 W of panels, average UK sunshine, little or no shade and no battery. It valued them at the July to September 2026 price cap. Here they are at the October to December 2026 cap of 26.32p per kWh, which includes no VAT because electricity VAT in Great Britain is 0% from 1 October 2026 to 31 March 2027:

The vertical kit uses a bigger share of its output at home because it produces less at any one time, but it still saves less because it produces much less overall.

Time to recover the cost. At today's prices, divide the kit price by the yearly bill reduction. Beside it we show a case where electricity prices rise 2% a year from the second year, in line with the Bank of England's 2% inflation target. Both are illustrations, not forecasts:

Export payments don't change these figures: we found no export tariff open to plug-in kits, so switching supplier for a better export rate doesn't help.

The impact assessment assumes a device lasts around ten years before at least the inverter may need replacing, and allows £100 for a replacement inverter.

Your figure will differ if:

• you are out during the day. A household that is out from morning to evening uses less of the output, so more flows to the grid unpaid;
• the panels are shaded or badly angled. Output falls, as the table shows;
• the price cap changes. Ofgem changes it every quarter; the next cap starts on 1 January 2027. Electricity VAT is due to return to 5% on 1 April 2027 unless the government extends the zero rate, which would make each kWh you avoid buying slightly more valuable;
• you are on a time-of-use tariff. Solar output is worth your daytime unit rate, which may be higher or lower than the cap average.

You can raise the share you use by running the dishwasher, washing machine or tumble dryer in the middle of sunny days, one at a time, rather than in the evening.

Export payments: not established

Don't count on being paid for surplus from a plug-in kit. Smart Export Guarantee (SEG) payments need an installation certified by MCS or an equivalent scheme, and a smart meter that records exports. The government's impact assessment said this "is likely not to apply in the first instance for many plug-in solar installers". E.ON Next's export tariffs, which we checked on 23 September 2026, require MCS or Flexi-Orb certification. The SEG also applies in Great Britain only.

Some consultation responses asked for SEG reform to cover plug-in solar, but we found no decision. Until there is one, value a kit on the electricity you use yourself, as in the examples above. Our Smart Export Guarantee guide explains how export tariffs work for certified systems.

Plug-in kit or rooftop solar?

A plug-in kit is a small, low-cost way into solar for people who can't or don't want to put panels on a roof: renters with permission, flat owners, or households that want to try solar before committing. A rooftop system produces far more and qualifies for export payments and 0% VAT, but costs more and needs an installer.

Neither price is a quote. See our solar panel cost guide for installed prices and our VAT guide for how VAT applies to each.

Plug-in solar FAQs

Are plug-in solar panels legal in the UK?

Yes in Great Britain, since 27 August 2026, for kits that meet the Interim Product Specification, are limited to 800 W, have no battery and are notified to your network operator. In Northern Ireland a separate change to local electricity safety rules is needed first; check with NIE Networks.

Will a 400 W solar panel run a fridge?

Not on its own. A 400 W panel produces 400 W only in strong sun. Using the PVGIS figures above, 400 W of south-facing panels tilted at 30° average about 44 W across a year (768 kWh ÷ 2 ÷ 8,760 hours), and nothing at night, while a fridge runs day and night. While the sun shines, the panel covers some or all of what the fridge draws and the grid supplies the rest, so you buy less electricity rather than going off-grid. The government says a full 800 W kit can run a typical fridge, television, Wi-Fi router, laptop, phone charger and games console at once when the sun is shining.

Do plug-in solar panels work in a power cut?

No. The inverter switches off when the mains supply fails, so the kit cannot power your home during an outage. Plug-in batteries are not allowed under the current rules.

Can I use plug-in solar if I rent?

Yes, if your landlord agrees. Get written permission before fixing anything to the building, check the planning position and tell your insurer. The same applies to leasehold flats, where the freeholder or managing agent may need to agree.

How much electricity does an 800 W kit produce?

Much less than 800 W for most of the day. PVGIS estimates about 768 kWh a year for 800 W of south-facing panels tilted at 30° in Birmingham, and about 568 kWh if they are mounted vertically. The government's own estimates, using a different method, are 690 kWh for a south-facing kit tilted at 30° and 378 kWh for a vertical east- or west-facing one.