UK climate
Do solar panels actually work in the UK?
Short answer: yes. UK irradiation is similar to Germany's — and Germany has more solar installed per capita than almost anywhere on earth. Below is the honest picture, region by region, season by season.
Last updated: 8 May 2026.
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The big picture
UK irradiation in numbers.
The UK gets between 800 and 1,100 kWh of solar energy per square metre per year at sea level — roughly 60% of equatorial irradiation. That sounds modest, but UK solar is sized for it: a 4 kWp domestic system typically generates 3,200–4,400 kWh per year here, depending on region and roof direction.
For comparison: Germany averages 1,000 kWh/m²/year — almost identical to England — and had over 80 GW of solar PV installed by 2024. The UK has plenty of solar irradiation to make domestic systems pay back; "we're too cloudy" simply isn't supported by the numbers.
By region
Output varies — but works everywhere.
Annual UK output by region for a typical 4 kWp south-facing system:
| Region | kWh/kWp/yr | 4 kWp annual output |
|---|---|---|
| South-West England | 1,000–1,100 | 4,000–4,400 kWh |
| South-East / East | 950–1,050 | 3,800–4,200 kWh |
| Midlands | 900–1,000 | 3,600–4,000 kWh |
| North England / N. Ireland | 850–950 | 3,400–3,800 kWh |
| Scotland | 800–900 | 3,200–3,600 kWh |
Figures assume a south-facing roof at optimal pitch, no significant shading. The Solarable Report uses district-level irradiation rather than these regional averages.
Season by season
When the UK actually generates.
Roughly two-thirds of UK annual solar output happens between April and September. June and July deliver the most — long days, high sun. November to February deliver the least — short days, low sun, often cloud cover.
- Summer (Jun–Aug): ~45% of annual output.
- Spring (Mar–May): ~25% of annual output.
- Autumn (Sep–Nov): ~20% of annual output.
- Winter (Dec–Feb): ~10% of annual output.
This seasonal pattern is built into the financial case. The savings calculator accounts for it directly so you're not over-promised on year-round generation.
Common myths
Things that sound true but aren't.
- "Solar doesn't work in clouds." Wrong. Reduced output, but not zero — typical UK systems generate 20–40% of peak output on heavily overcast days, and 60–80% on bright cloudy days.
- "Panels don't work in rain." They generate less because rain means cloud. Rain itself helps by washing the panels.
- "It's too cold for solar in the UK." Solar PV actually performs slightly better in cold weather — efficiency drops in heat. UK temperatures are ideal for panel output.
- "You need a south-facing roof or it won't work." A myth. East and west-facing roofs reach 80–90% of south-facing output. See the roof direction guide.
- "The UK gets less sun than every other country." The UK gets less direct sunlight than Spain — but more than Germany, which leads Europe on solar.
The verdict
So yes — UK solar works.
UK climate is well within the range where solar PV pays back. The financial case is strongest in the South-West and South-East but works across the country. The variables that genuinely matter for your home are roof direction, shading, electricity use, and how long you plan to stay — not whether the UK has "enough sun".
Common questions
FAQs about UK solar performance.
Isn't the UK too cloudy for solar?
No. UK irradiation is around 60% of the equator's, but solar PV is sized for that — the panels and the financial case are designed around UK light levels. The UK has roughly the same annual irradiation as Germany, which has more solar installed per capita than almost anywhere on earth.
Do solar panels work on cloudy days?
Yes — at reduced output. On a heavily overcast day a solar PV system typically generates around 20–40% of its sunny-day output. On a bright but cloudy day (high cloud, no shadows on the ground) it can hit 60–80%. Annual generation accounts for all weather patterns; "doesn't work in cloud" is a myth.
How much do solar panels generate in a UK winter?
Roughly 10–15% of a UK system's annual output happens in November–February. Days are short, sun is low, and panels often have less direct light. The other 85–90% comes from March–October when daylight is long and the sun is high. The financial case averages this out across the year.
Does it matter where in the UK I am?
A bit. South-West England, the South Coast, and East Anglia get around 1,000–1,100 kWh per kWp of installed solar per year. Scotland, Northern England, and Northern Ireland get around 800–950 kWh/kWp. The financial case still works across the UK — payback in Scotland is a year or two longer than in Cornwall but it's still inside the system's lifetime.
Do panels still work in rain or snow?
Rain doesn't stop generation — it just means cloud, which reduces output. Rain actually helps by washing dust off the panels. Light snow blocks generation while it sits on panels but slides off relatively quickly thanks to panel angle and warmth. Heavy persistent snow (rare in most of the UK) can shade panels for days, which is part of the winter low-output picture.
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