A 20% gap separates the UK's sunniest and cloudiest regions. This comprehensive table shows where 800W plug-in solar generates most and least.

Best and Worst UK Regions for Plug-in Solar Generation

UK solar generation varies significantly by region. An 800W plug-in system in sunny Devon generates nearly 20% more than one in cloudy north-west Scotland. Understanding your region's potential is crucial for investment decisions.

This guide compares generation across the UK using PVGIS data (the EU's standard solar irradiance model) for a south-facing, unshaded 800W system.

Generation by Region: Comprehensive Table

Region	Representative City	Annual kWh	vs. UK Average	Annual Saving (£)	Payback (Years)
South-West	Exeter, Devon	950–1,000	+15% to +20%	£180–£220	5–6
South	Brighton, Sussex	920–950	+12% to +15%	£170–£210	5–6
South-East	London	900–920	+10% to +12%	£160–£200	5–7
East Anglia	Norwich	880–900	+7% to +10%	£150–£190	6–7
Midlands	Birmingham	800–820	-2% to 0%	£130–£160	7–8
Wales	Cardiff	790–810	-4% to -2%	£120–£150	8–9
Yorkshire	Leeds, Sheffield	690–705	-15% to -13%	£100–£120	7–9
North-West	Manchester, Liverpool	670–680	-18% to -17%	£95–£115	7–9
North-East	Newcastle	640–660	-21% to -19%	£90–£110	8–9
Central Scotland	Edinburgh, Glasgow	600–620	-26% to -24%	£80–£100	9–11
North-West Scotland	Inverness	560–580	-31% to -29%	£70–£90	10–12
Northern Ireland	Belfast	640–660	-21% to -19%	£90–£110	8–10

Analysis: Regional Variation

The 20% gap between Devon (1,000 kWh/year) and north-west Scotland (580 kWh/year) is stark. However:

Even "low-performing" regions are viable. A Newcastle system at 650 kWh/year pays for itself in 8–9 years—a solid return given 25-year panel lifespan.
Shading matters more than latitude. A shaded Devon roof underperforms a clear Newcastle roof. Local microclimate (nearby trees, building shadows) affects output more than regional location.
Self-consumption rates are similar across the UK. Whether in Manchester or Exeter, homeowners with daytime occupancy see 60–70% self-consumption. The difference is absolute kWh, not rate.

Best UK Regions for Plug-in Solar

South-West (Devon, Cornwall, Somerset)

Annual output: 950–1,000 kWh Why it's best: Highest UK insolation, fewer cloudy days, south-facing coastal properties often unshaded.

Typical setup:

800W south-facing roof system
75–85 kWh/month average
Self-consumption: 60–70%
Payback: 5–6 years
25-year generation: 24,000+ kWh (£3,600+ bill savings)

South-west homeowners should prioritize installation. Payback is fastest, and long-term savings are substantial.

Regional challenges:

Tourism season (summer) creates export spikes—not all export credits may be used
Storm exposure (high winter rainfall) requires robust installation
Coastal salt spray (if near coast) requires corrosion-resistant fittings

South and South-East (Sussex, Kent, London, Surrey)

Annual output: 900–950 kWh Why strong: Consistent insolation, many south-facing properties, established supply chains.

Typical metrics:

70–75 kWh/month average
Payback: 5–7 years
25-year generation: 22,500–23,750 kWh

South and south-east properties have excellent ROI. Planning and listed-building rules are stricter, but performance justifies the effort.

East Anglia (Norfolk, Suffolk)

Annual output: 880–900 kWh Why competitive: Relatively flat terrain (less shading), abundant south-facing properties, lower rainfall than west.

Metrics:

70–73 kWh/month average
Payback: 6–7 years
25-year generation: 22,000–22,500 kWh

East Anglia offers excellent value with simpler planning than southern conservation areas.

Worst UK Regions for Plug-in Solar

North-West Scotland (Highlands, Islands)

Annual output: 560–580 kWh Why poorest: Highest cloud cover, lowest sun angle, frequent overcast days.

Challenges:

47–48 kWh/month average
Winter generation drops to 10–15 kWh/month
Payback: 10–12 years
Shading is common (Scottish glens, tree cover)

Verdict: Viable if property is unshaded and owner has high daytime occupancy. Marginal for typical homeowners.

Central Scotland (Lowlands)

Annual output: 600–620 kWh Why challenging: Frequent cloud, higher latitude, industrial/urban shading.

Metrics:

50–52 kWh/month average
Payback: 9–11 years
Winter generation: 15–20 kWh/month

Verdict: Viable for homes with high self-consumption (retired, WFH). Less attractive for owner-occupiers with full-time work.

North-East England (Newcastle, Durham)

Annual output: 640–660 kWh Why lower: Coastal cloud formation, higher latitude, industrial shading.

Metrics:

53–55 kWh/month average
Payback: 8–9 years
25-year generation: 16,000–16,500 kWh

Verdict: Solid long-term investment despite longer payback than south. Better than Scottish alternatives.

Regional Winner: South-West

Devon and Cornwall are the clear winners:

Sunniest climate: 950–1,000 kWh/year
Fastest payback: 5–6 years
Highest 25-year savings: £3,600–£4,000
Most reliable winter generation: Still 40–50 kWh/month in December–February

South-west homeowners should prioritize installation. Even marginal shading is tolerated because the baseline is so high.

Regional Loser: North-West Scotland

Inverness and Outer Hebrides have the poorest conditions:

Lowest UK insolation: 560–580 kWh/year
Slowest payback: 10–12 years
Winter generation collapse: 10–15 kWh/month Dec–Feb
Shading compounds losses: Many properties shaded year-round

North-west Scottish installations are economically marginal. Batteries or hybrid systems might improve returns, but payback extends beyond 12 years for typical households.

Mid-Range Regions: The Decision Point

Midlands, Yorkshire, North-West, and Wales sit in the middle:

670–820 kWh/year
6–9 year payback
Viable if property is unshaded and owner has daytime occupancy
Marginal if shaded or occupancy is low (away at work all day)

For these regions, shading assessment is critical. An unshaded Midlands roof outperforms a shaded Manchester one.

How to Assess Your Region

Identify your postcode. Use our plug-in solar quiz to get a postcode-specific estimate.
Check PVGIS data. Visit EU PVGIS directly and enter your coordinates for detailed monthly data.
Assess local shading. Photograph your proposed installation site (roof, terrace, garden) at solar noon in winter. If shadows fall on the proposed panel location, generation drops 20–50% regardless of regional potential.
Estimate self-consumption. How many hours per week is someone home during daylight? Higher occupancy increases ROI.

Affiliate Monitoring Tools

To verify regional performance after installation, use:

Tapo P110 smart plug: track real-time generation and compare to PVGIS forecasts
EcoFlow STREAM inverter: includes web-based monitoring dashboard
EcoFlow DELTA 2 battery: stores excess generation for evening/winter use

Summary: ROI by Region

Region	Payback	25-Year Saving	Recommendation
South-West	5–6 yrs	£3,600–£4,000	Install immediately
South/South-East	5–7 yrs	£3,200–£3,800	Strong ROI, check planning
East Anglia	6–7 yrs	£2,800–£3,200	Good ROI, straightforward planning
Midlands/Wales	7–9 yrs	£2,200–£2,800	Viable if unshaded
Yorkshire/NW	7–9 yrs	£2,000–£2,600	Viable if high occupancy
North-East	8–9 yrs	£1,800–£2,200	Viable for committed investors
Central Scotland	9–11 yrs	£1,600–£2,000	Marginal, needs high self-consumption
NW Scotland	10–12 yrs	£1,400–£1,800	Only if unshaded, high occupancy

Regional Climate Trends

UK weather patterns are slowly shifting. Recent years show:

South-west becoming sunnier (reduced cloud cover)
North remaining cloudier but slightly less extreme
Extreme weather (storms, flooding) more common in winter—important for roof durability

Over the 25-year lifespan of a solar system, southern regions may see even better performance; northern regions may see marginal improvement.

Conclusion

Regional location matters, but it's not destiny. An unshaded north-east home with high daytime occupancy outperforms a shaded south-west home. Before deciding, assess your specific property's shading and occupancy patterns.

For a tailored recommendation based on your postcode and property type, try our plug-in solar quiz.

For specific property-type guides across regions, see our articles on plug-in solar for semi-detached houses and plug-in solar in northern England.