Five years of real growth, not hype
UK solar has not grown steadily. It dipped, then it surged. In 2020, the first full year of the pandemic, new installations fell to 35,929, the lowest point in this five-year run. By 2022, as the energy crisis pushed households to look for any way to cut bills, new installations had nearly quadrupled to 138,781. Growth has not slowed since, with 2025 setting an all-time record of 269,326 new installations, more than any year on record.
The chart below plots each year against a straight trend line. The line makes the direction obvious even with the 2020 dip and the small 2024 correction included: UK solar has been on a consistent upward path for five years running.
Source: DESNZ, Solar Photovoltaics Deployment statistics, Table 1. Figures show UK-wide new installations by calendar year, calculated from December year-end cumulative totals.
Cumulative UK solar installations passed 2,076,000 by June 2026. Total UK solar capacity stood at 22.8 GW, on course to comfortably beat the government's own 45-47 GW target for 2030 if the current growth rate holds. For the full range of options this growth represents, see our Solar Solutions hub.
Which regions are actually leading
The South East and South West have the most solar sites in absolute terms, and that has not changed. What has changed is which regions are growing fastest, and the answer is not the sunniest parts of the country.
Scotland's solar site count has more than doubled in five years, up 109% between 2020 and 2024, the fastest growth rate of any UK region. London, despite having the fewest solar sites of any English region, is the fourth fastest growing, up almost 61%. Both are places without much rooftop solar to speak of, and both are exactly the kind of market plug-in solar is aimed at: flats, rented homes, and buildings where a full rooftop system was never realistic.
Source: DESNZ, Regional Renewable Statistics 2003-2024. Figures show percentage growth in number of solar PV sites by UK region, 2020 to 2024.
The pattern matters for how you read the 27 August rules. Plug-in solar is not really competing with rooftop solar for the South East's market. It is aimed squarely at the regions where growth is fastest but the housing stock makes a full system difficult or impossible, which is exactly where Scotland and London already sit.
What homeowners are actually earning back
The Smart Export Guarantee pays households for surplus solar electricity sent back to the grid. It launched in January 2020, and five years of Ofgem's own annual reports show a scheme that has grown from a niche add-on into a genuine source of household income.
In its first fifteen months, the SEG paid out £114,480 across the whole of the UK, a rounding error next to what followed. By Year 5, April 2024 to March 2025, payments had reached £56.97 million, a more than 400-fold increase in real money paid to households in five years.
Source: Ofgem, Smart Export Guarantee Annual Reports, Years 1 to 5. SEG runs on a financial year basis, April to March, except Year 1 which covers the scheme's launch from January 2020.
Average SEG tariff rates rose alongside the payments, from 3.15p/kWh in Year 1 to 10.8p/kWh in Year 5, more than tripling over the same period. But this scheme has a hard requirement worth understanding before we get to plug-in solar specifically: SEG payments require an MCS-certified installation. A self-installed system, plug-in or otherwise, cannot register for the SEG. Every unit of surplus electricity a DIY system exports is given away, not sold, until the installation is MCS-certified.
What a real solar system costs in 2026
Government cost data, drawn from over 155,000 MCS-certified domestic installations, puts the current average cost of a professionally installed solar system at £1,962 per kW for the 2025/26 financial year, down almost 5% on the year before. For a typical 4kW domestic system, that works out to roughly £8,382 for panels and installation alone.
That figure does not include a battery. Add a typical 10kWh battery, and a bundled solar-plus-battery system runs to somewhere between £13,700 and £15,000. Here is how that full amount actually breaks down, based on the government's own installation cost data plus industry-standard cost ratios for labour and hardware.
Sources: DESNZ Solar PV Cost Data 2025/26 (panel and installation total, which bundles hardware and labour together); battery cost from market survey of typical 10kWh UK installations. The panels/labour/inverter/scaffolding split is an industry-consensus estimate applied to the real DESNZ total, since DESNZ does not publish that split itself.
Bigger systems cost less per kW, not more. A 10-50kW system averages £1,415/kW, roughly a third cheaper per kW than a small 0-4kW domestic system at £2,096/kW. For the fuller picture on payback periods, government grants and whether a full system suits your roof, see our complete UK solar panels FAQ. Whatever size you are comparing plug-in solar against, the fair comparison is cost per kW installed, not the headline total, because a full system and an 800W plug-in kit are not the same scale of purchase.
27 August 2026: what the law actually changes
The legislation that makes plug-in solar legal is SI 2026/848, signed by Energy Minister Martin McCluskey on 16 July 2026 and in force from 27 August 2026. It is frequently, and wrongly, credited to BS 7671 Amendment 4. Amendment 4 is a wiring standard that supports the change technically. SI 2026/848 is the actual statutory instrument that makes it legal.
The regulation creates a new legal category, a plug-in microgenerator, defined precisely in the statute:
- Generates electricity from direct conversion of sunlight, solar only
- Maximum rated AC output not exceeding 800 watts
- Connects via a standard plug and socket
- Designed to operate in parallel with the distributor's network
- Is not designed to import and store electrical energy for later use
That last point is the one worth reading twice. Battery storage is explicitly excluded from the new plug-socket route, in the exact wording of the statute itself. A device with a built-in battery, however it is marketed, does not qualify for the simplified connection and still requires a qualified electrician under the existing rules.
One more detail rarely mentioned: the compliance requirement under Regulation 3 extends to England, Wales and Scotland only. Northern Ireland is governed separately, and the 27 August date does not apply there in the same way.
None of this removes the requirement to notify your Distribution Network Operator. Plug-in solar is still grid-connected generation, so a G98 notification still applies after 27 August, just as a short form rather than an application for permission.
Plug-in vs full system: the true cost comparison
A full solar and battery system costs roughly £13,700 to £15,000. A plug-in kit costs £349 to £900. Compared like that, plug-in solar looks like a different order of magnitude cheaper. It is not, once you compare like for like.
An 800W plug-in kit is a fraction of the size of a typical 4kW rooftop system. The fair comparison is cost per kW installed, not the headline total.
Sources: DESNZ Solar PV Cost Data 2025/26 (full system); current UK plug-in solar retail pricing, £349-£900 per 800W kit.
Even accounting for VAT, plug-in kits are often cheaper per kW than a full installed system. That is not because of a tax advantage. It is because there is no installation labour, no scaffolding, and no electrician. The advantage a full system has is not unit cost, it is scale, plus access to battery storage and the Smart Export Guarantee, neither of which a plug-in kit can offer.
The VAT gap nobody mentions
Professionally installed solar, including a battery, currently qualifies for 0% VAT until 31 March 2027, under HMRC's energy-saving materials relief. Plug-in solar kits do not. They are taxed at the standard 20% rate, the same as any other consumer appliance.
This is not a loophole anyone is missing. HMRC's own guidance is explicit: the 0% rate only applies when a single VAT-registered business both supplies and installs the system as one combined contract. A retail-bought plug-in kit, installed by anyone including yourself, does not qualify, and buying a kit then separately hiring an electrician afterward does not retroactively earn the relief either. The goods and the labour have to be one transaction from one qualifying business, and plug-in solar's entire selling point, that you install it yourself, structurally excludes it from ever meeting that condition.
Full systems get 0% VAT because the law assumes professional installation. Plug-in solar exists specifically because it does not need one. The relief was written before this category existed, and nobody has updated it since.
Is anything actually for sale yet?
The law changes on 27 August. That does not mean a certified kit will be sitting on a shelf that morning. As of the most recent checks, the ENA's G98 Type Test Register listed zero products approved under the new Interim Product Specification, the specific certification the plug-socket route requires.
That distinction matters. G98 approval for grid connection already exists for several products, including EcoFlow's STREAM and PowerStream microinverters, Hoymiles' HMS-800W-2T, and Anker's SOLIX range. That approval covers whether an inverter is safe to connect to the grid at all, the route currently used by professionally installed systems. It is not the same as the new plug approval SI 2026/848 introduces, and as of the last check, no product had completed that second, newer certification.
A June 2026 DESNZ safety study tested six plug-in devices already being sold on the open market. All six performed safely on the core engineering checks, thermal behaviour, fault handling and anti-islanding shutdown. All six also exceeded the Class B conducted-emissions limit at full rated power, a genuine technical compliance problem, not a paperwork delay.
Retailers have publicly committed. EcoFlow, Anker and Lidl passed the government's initial technical review in March 2026. Amazon, B&Q, Currys and Lidl confirmed their commitment at a government roundtable in June. As of the most recent check, four months after the March announcement, none of them had a certified plug-in kit on sale.
Worth knowing if you are browsing now: some kits currently listed on UK retail sites are built to Germany's plug and safety standard, not the UK's. The UK specification explicitly takes precedence where the two differ, so a German-spec unit will not arrive with UK conformity assessment or a UK plug.
What safety experts are actually saying
In June 2026, five of the UK's major electrical bodies, the ECA, Electrical Safety First, the IET, NICEIC and SELECT, issued a joint statement urging caution ahead of the 27 August rollout. This was not a fringe objection. These are the organisations that set and enforce UK wiring safety standards.
Their concerns were specific: bi-directional power flow in circuits never designed for it, fire risk in older properties with ageing wiring, inconsistent product standards, and unresolved questions over insurance and liability if something goes wrong with a self-installed system.
"Public safety must be the first principle in any rollout of plug-in solar PV units."
NICEIC
"We are saying very clearly to government, do not put speed ahead of safety."
Gary Parker, Deputy Director of Technical, ECA
None of these bodies are opposed to plug-in solar itself. Their position is about the pace and safeguards of the rollout, not the technology. The ECA's Gary Parker put it plainly: done properly, plug-in solar could help more people take part in the clean energy transition. Done badly, it could damage public confidence and create avoidable safety risks.
Electrical Safety First raised a specific technical point worth understanding: plug-in PV systems may interfere with residual current devices, the RCDs that protect a home's wiring, potentially causing nuisance tripping or, more seriously, failing to detect a genuine fault. This is exactly the kind of detail a compliant, properly certified product is designed to manage, and exactly why the emissions test failures covered in the previous section matter more than a simple compliance deadline.
Considering solar panels for your UK home but not sure where to start? Below we answer the questions homeowners ask most, from whether solar is genuinely worth it, to real installed costs, payback periods, and how panels actually perform through a British winter.
Every figure here is based on current UK installation data and updated as prices and regulations change. If you're further along and comparing specific hardware, our Solar Solutions guides cover panels, batteries, and inverters in detail.
Why plug-in solar deserves 10% VAT, not 20%
This is our position, not a policy that exists. We think it should.
The government already accepts the principle that solar deserves tax relief. Full systems get 0% until 2027, then 5% after. Plug-in solar is the only category of solar hardware sitting at the full 20% standard rate, purely because of how the transaction is structured, not because the technology is treated differently.
We are not arguing for the same 0% rate full systems get. That would remove any tax incentive to use a qualified electrician where one genuinely improves safety, and the electrical bodies covered above have a fair point about wanting professional installation to remain the preferred route. A flat 10% rate is a genuine middle position: a real cut, not a token gesture, without removing the incentive toward professional installation entirely.
The government has already done the difficult regulatory work. SI 2026/848 exists, the Interim Product Specification exists, the safety framework is being built. A VAT adjustment is the one remaining lever that would meaningfully change the economics for the renters and flat owners this legislation was written for, at a modest cost to the Treasury rather than a significant one.
Until that changes, the honest advice is to go in with your eyes open: a plug-in kit will cost you 20% more in tax than the exact same panels would if fitted as part of a professional installation. That is not a reason not to buy one. It is a reason to know the real number before you do.
Your real questions, answered
Is plug-in solar actually worth it, or is it just hype?
- Genuinely mixed, not a clean yes. A no-battery 800W kit costs roughly £625/kW against a full system's £2,096/kW, but realistic annual savings sit at just £40-85/year without storage.
- At those numbers, payback runs to 8 or more years, similar to a full system despite the much lower entry cost.
- It is worth it for access, not economics: if you have no other route to solar at all, it beats nothing. If you already have a roof, a full system remains the stronger financial choice.
Is plug-in solar legal and do I need an electrician?
- Yes, from 27 August 2026, under SI 2026/848, for certified 800W kits with no battery.
- You do not need an electrician for a certified device's connection itself, but a G98 notification to your DNO is still required.
- As of the most recent checks, no product had actually completed the new certification yet, so treat "legal from 27 August" and "buyable on 27 August" as two separate questions.
How much money can plug-in solar actually save me?
- The government's own realistic estimate is £40-85 a year for a no-battery 800W kit, not the higher figures sometimes quoted.
- Without a battery, only electricity used the moment it is generated counts toward savings. Anything surplus is exported unmetered and unpaid.
- If nobody is home during the day, real savings sit toward the lower end of that range.
Can I use plug-in solar if I rent or live in a flat?
- Often yes, since a plug-in kit is removable and does not require permanent structural changes, unlike a rooftop system.
- Most tenancy agreements still require written landlord permission for external fixtures, even removable ones.
- If you might move within a few years, weigh the roughly 8-year payback against how long you expect to stay before committing.
Why is plug-in solar limited to 800W?
- 800W is the maximum AC output the law defines for a plug-in microgenerator, set out precisely in SI 2026/848.
- The cap exists to keep the current flowing into a standard ring main circuit within safe limits without an electrician's involvement.
- You can fit up to 2,000W of DC solar panel capacity to maximise low-light generation, even though the inverter clips output at 800W.
Does plug-in solar work during a power cut?
- No. Certified microinverters include mandatory anti-islanding protection that shuts the system down instantly during a power cut, to protect grid engineers working on the lines.
- Backup power during an outage requires a separate battery system with genuine islanding capability, a different product category entirely.
Can I add a battery to a plug-in solar kit?
- Not under the simplified plug-socket route. SI 2026/848 explicitly excludes any device designed to import and store electricity for later use.
- A kit with a battery, however it is marketed, still requires a qualified electrician under the existing rules.
- If storage matters to you, see our Solar Batteries guide for genuinely battery-eligible options.
Can I get paid for exporting electricity from plug-in solar?
- No. The Smart Export Guarantee requires an MCS-certified installation, and a self-installed plug-in kit cannot get MCS certification.
- Every unit of surplus electricity a plug-in kit exports is given away, not sold, unless you later upgrade to a certified installation.
Does plug-in solar work in cloudy UK weather?
- Yes, panels generate from daylight, not direct sunshine, though output drops to roughly 10-25% of peak on overcast days.
- UK irradiance broadly matches northern Germany, where plug-in solar is already a mature, mainstream market.
- Shading from trees or buildings affects output more than cloud cover does.
How much does a plug-in solar kit cost?
- Current UK retail pricing runs from £349 for an entry-level kit to £900 for a premium 890W panel setup, VAT included.
- Plug-in kits are taxed at the standard 20% VAT rate, unlike professionally installed full systems, which qualify for 0% until March 2027.
- For the fuller cost breakdown and how it compares to a full system, see the sections above.
Plug-In Solar UK: Hype or Genuine Saving?
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