What changed in August 2026
Until the end of August 2026, the electricity safety rules in Great Britain did not allow a solar panel to feed power into a home through an ordinary plug. That changed with SI 2026/848, which came into force on 27 August 2026 (SI 2026/848).
The instrument amends two sets of rules. One is the Plugs and Sockets etc. (Safety) Regulations 1994, which now allow a standard plug to be approved for use with a plug-in solar unit. The other is the Electricity Safety, Quality and Continuity Regulations 2002, the rules for equipment that runs alongside the electricity network. The change to those safety and continuity rules extends to Scotland, as well as to England and Wales.
So the basic answer for Scotland is the same as for the rest of Great Britain: a compliant plug-in solar unit can now be used legally. What the regulations do not settle are the Scottish questions around it, such as planning, tenement rules and tenancy terms. Those are covered below.
What counts as a plug-in unit
The regulations define a plug-in microgenerator closely (SI 2026/848). To count, the unit must:
- make electricity directly from sunlight;
- have a maximum rated alternating current output of no more than 800 W;
- be intended to connect to the home's wiring through a standard plug and socket;
- be designed to run alongside the electricity network, not cut off from it;
- not be designed to draw power from the network to charge storage, apart from small control functions the specification allows.
The explanatory note adds that a unit must not be installed or operated unless it meets the interim product specification for plug-in solar devices published alongside the regulations. The plug itself has to follow the familiar British plug standard, apart from the parts that would otherwise forbid its use with a generator, and must meet the same specification.
In practice, that means buying a unit sold specifically as compliant with the GB rules. A kit made for another country's rules, or an adapted lead from a general solar panel, is not the same thing. If a listing does not say plainly which specification the unit meets, treat that as a reason not to buy it.
The output limit is on the alternating current the unit delivers, not on the panels' rating on paper. Some units pair panels with a slightly larger combined rating with an inverter that holds output at the limit. Either way, the most it can feed into your sockets at any moment is 800 W.
Planning, tenements and tenancies in Scotland
Planning. Scotland has its own planning order, and its householder right for solar, Class 6HA, covers solar equipment on a dwelling, including flats, subject to conditions (the order, Part 1A). This guide found no Scottish Government statement on how planning applies to plug-in solar, and it is not confirmed whether Class 6HA covers a panel clipped to a balcony rail or a wall. Until that is clarified, ask your council's planning team before fixing anything to the outside of a building. Be especially careful with a listed building, a home in a World Heritage Site or a conservation area, where the rules for ordinary solar are already tighter. The planning permission guide explains those limits for roof panels.
Tenements. Many Scottish flats are in tenements, where parts of the building belong to the owners jointly. Under the Tenements (Scotland) Act 2004, the top flat's title extends to the roof above it unless the deeds say otherwise (section 2), and the Tenement Management Scheme treats the roof and other key parts of the structure as scheme property shared by the owners (Tenement Management Scheme). Your title deeds may also restrict what can be fixed to the outside of the building. Read the deeds, and talk to your neighbours or the factor, before drilling into a shared wall or a balcony that is part of the structure. The tenements and flats guide explains how decisions are made in a shared building.
Tenancies. Legal to use does not mean allowed in a rented flat. Fixing a panel to a balcony, a window frame or a wall is an alteration, and most tenancy agreements need the landlord's consent for that. Get it in writing. The renting guide covers how to raise solar with a landlord.
Wind. Scotland is windy, and a balcony panel is a sail. Whatever the paperwork says, the unit must be fixed so that it cannot move, rattle or fall. On a high or exposed balcony, ask the seller what wind conditions its mounting is designed for.
How much a plug-in unit might make
Plug-in solar is small, and its output is small. The table uses PVGIS figures per kW of panels, multiplied by 0.8 kW to match the output limit, for three positions: the best angle facing south, a steep 50-degree angle facing south, and lying flat (PVGIS 5.3).
| Place | Best angle, facing south | Steep, facing south | Lying flat |
|---|---|---|---|
| Dundee | 760 | 750 | 600 |
| Edinburgh | 730 | 720 | 590 |
| Aberdeen | 720 | 720 | 580 |
| Glasgow | 680 | 680 | 570 |
| Inverness | 650 | 640 | 540 |
| Lerwick | 610 | 610 | 510 |
PVGIS 5.3 yearly output per kW, multiplied by 0.8, rounded to the nearest 10 kWh. Source: PVGIS 5.3. Treat these as upper bounds: they assume no shade and a clear southern view.
These are best cases. A panel hung upright on a balcony rail is steeper than any position in the table, and PVGIS figures for an upright panel are not included here. A balcony that faces east or west, sits in the shadow of the next block, or looks onto a narrow street will make noticeably less. Real figures for many Scottish flats will sit well below the table.
Set even the best figures against use. Ofgem treats 2,500 kWh a year as typical household electricity use (Ofgem). A steep, south-facing unit in Glasgow would make roughly 27% of that, by our arithmetic. Month by month, PVGIS gives that much panel at the best angle in Glasgow about 86 kWh in June and 17 kWh in December. An average June day yields about 2.9 kWh, against a typical home's 6.8 kWh a day.
What plug-in solar does best is cover part of the steady daytime load: the fridge, the router and anything else that runs around the clock. Power the home does not use at that moment flows out to the network. Export tariffs need an MCS-certified installation (GOV.UK), and a plug-in unit is normally bought and plugged in without one, so assume that spare power goes unpaid unless a supplier tells you otherwise. For anyone with a suitable roof, a full roof system makes far more; the cost guide shows what Scottish households paid per kW for those.
Questions before you buy
- Does it meet the GB rules? The seller should state that the unit and its plug meet the interim product specification for plug-in solar devices. If it does not say, do not buy it.
- Is the output within 800 W? Check the inverter's rated AC output, not just the panels.
- Which socket will it use? Use a fixed wall socket in good condition, not an extension lead or a multi-way adaptor. If your wiring is old or you are unsure about the circuit, have a qualified electrician look at it first.
- Who needs to know? The regulations place plug-in units within the rules for equipment running alongside the network. Ask the seller what, if anything, you need to tell your network operator, and check with SP Energy Networks or SSEN if the answer is unclear. The grid connection guide explains who serves your area.
- Where will it go, and who agrees? Check the title deeds, your tenancy and the council's view on planning before fixing anything outside.
- How is it fixed? Ask what wind the mounting is designed for, and whether it needs drilling into stone, render or a balcony structure.
Plug-in solar will not transform a household's electricity use. For a flat with a sunny, sheltered balcony and someone home in the day, it can be a modest, legal way to use some of the light falling on the building, once the Scottish questions above have clear answers.