Plug-in solar in the UK — what's actually changing in 2026

On 24 March 2026 the UK government announced that plug-in solar panels — small panels you connect directly to a domestic mains socket, no electrician needed — will be legal in the UK within months. This brings the UK into line with Germany, the Netherlands, and a handful of other European countries where "balcony solar" has been mainstream for years. This guide walks through what's actually changing, who it's for, and where it stops being the right answer.

What plug-in solar is

A plug-in solar setup is one or two panels (often mounted on a balcony rail or in an outdoor space), wired to a small inverter, with a standard plug that goes into any wall socket. The panel generates DC, the inverter converts to AC, and the AC feeds back through your house wiring. Whatever your home is using at that moment is offset by what the panel is producing.

In Germany this category is called Balkonkraftwerk ("balcony power plant"). Around half a million units are added to the German grid every year. Typical setups produce 300–800W under good conditions and cost €200–€600 retail.

What the UK government announced

The 24 March 2026 announcement covered two specific regulatory changes:

• G98 distribution code update. The G98 is the standard that governs how small-generation systems connect to the UK grid. Currently it requires installer involvement for any grid-connected solar, however small. The amendment lets sub-800W plug-in systems connect via a normal domestic socket without electrician involvement.
• BS 7671 wiring regulations update. The wiring rulebook will get tailored safety standards specifically for plug-in solar.

Both changes are expected to land in months — the EcoFlow industry note in the announcement suggested products available "by summer" 2026.

Who plug-in solar is for

The government's framing emphasises two groups that have been left out of UK rooftop solar:

• Renters. Rooftop solar typically requires landlord permission, plus enough security of tenure to make a multi-year payback worth it. Plug-in solar is portable — when you move, it comes with you.
• Flat dwellers. Apartment leaseholders often don't have unilateral rights to install on a shared roof. A balcony is theirs. A plug-in panel on a balcony is theirs.

There's also a third group worth naming: homeowners who want to dip a toe in without committing £4,000+ to a full rooftop system. A plug-in setup at €300–€500 is a low-stakes way to find out how solar interacts with your actual electricity use.

What plug-in solar cannot do

Important caveats to set expectations:

• It generates much less than a rooftop system. A typical UK rooftop install is 4 kWp — fifty times the output capacity of an 800W plug-in panel. Even on a perfect summer day, an 800W plug-in panel maxes out around 3–5 kWh — vs 25–35 kWh for a 4 kWp rooftop array.
• It probably won't qualify for SEG export payments. The Smart Export Guarantee requires an MCS-certified install. Plug-in setups don't go through that route. Any electricity you generate but don't immediately use will export to the grid for free — see the SEG explainer for context.
• It can't go on most pitched roofs. Plug-in rules cover balcony, terrace, garden, or wall-mounted setups. Roof installations remain the territory of full MCS-certified rooftop solar.
• The financial case is different. Without SEG, the return is based purely on self-consumption — what you generate while you happen to be using it. For a typical UK household pattern, that might mean 60–80% self-consumption rate on plug-in vs 40–60% on rooftop.

Realistic numbers for an 800W plug-in setup

Rough UK ballpark (final figures will depend on which products reach the market):

• Cost: £250–£600 for the panel + microinverter + mounting kit. Less if you buy two panels and one inverter.
• Annual generation: 400–700 kWh in the UK with a south-facing balcony at the right tilt. Less in shaded or non-south situations.
• Annual saving (self-consumed): £100–£200 at 2026 retail electricity rates, depending on how much of the generation you use directly versus exporting for free.
• Payback: typically 3–5 years. Faster than rooftop solar in absolute payback terms; smaller in absolute saving.

The financial case is real but small. Plug-in solar is a sensible decision for a renter or flat dweller, not a substitute for rooftop solar where rooftop is viable.

Plug-in vs rooftop — when to choose which

Factor	Plug-in (≤ 800W)	Rooftop (3–6 kWp)
Cost	£250–£600	£4,800–£10,000
Annual generation	400–700 kWh	3,200–5,500 kWh
Annual saving	£100–£200	£550–£1,200
Payback	3–5 years	8–12 years
Lifetime saving	£2,000–£4,500	£15,000–£25,000+
Needs installer?	No (post-2026 reforms)	Yes
Needs MCS?	No	Yes (for SEG)
Works for renters?	Yes — portable	Usually no
Works for flats?	Yes — balcony	Rarely

If you own your home and have a usable roof, full rooftop solar is still the bigger win. If you don't, plug-in solar finally gives you a UK option.

What to wait for before buying

The announcement is in March 2026; the regulatory change is in months. A few things worth confirming before committing:

• The amended G98 takes effect. Until the formal change lands, plug-in solar still technically falls under the old "needs installer" rule.
• BS 7671 amendment publishes. Wiring regulations matter for liability and home-insurance purposes.
• CE/UKCA-marked kit reaches UK retail. German Balkonkraftwerk kit isn't automatically UK-compliant — UK-specific products will appear once the regulation is final.
• Your home insurance. A few insurers may want notification of any energy generation device. Worth a 10-minute call once you've bought.

Related

• Are solar panels worth it in the UK in 2026?
• Smart Export Guarantee (SEG) explained
• Can I get solar panels?
• How much do solar panels cost in the UK?