Metered, not modelled
Solar output in Swansea
695–841 kWh per kWp a year
the middle half of 302 real Swansea systems, measured over 2024
- Systems measured 302
- Median 775
- Best 10% of roofs 906
- Rank of 49 areas 26th
- Typical system size 2.9 kWp
A typical 4 kWp system here made roughly 2,780 to 3,360 units of electricity last year.
Not a forecast. 302 solar systems around Swansea were metered through 2024, and the middle half made 695 to 841 kWh for every kWp of panels.
A good roof does better still: the top tenth here reached around 906 kWh per kWp, against a British median of 766.
Only 65% of these systems face south, south-east or south-west, against 86% nationally — so part of what you see here is roof direction, not the sky.
That places Swansea 26th of 49, ahead of 23 of the areas we can measure.
At the other end, the quietest tenth of systems here made about 592 kWh per kWp — usually shade, a poor direction, or both.
What none of it tells you is what your own roof would do. These systems point in every direction and some have been up for fifteen years.
The spread behind that number
Every Swansea system, grouped by what it made, against Britain as a whole. The two shapes overlap heavily, which is the honest headline: your postcode nudges the result, your roof decides it.
Swansea: the middle half of 302 systems made 695–841 kWh per kWp.
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Areas near Swansea
Neighbouring postcode areas we can also measure.
How Swansea compares
Looking for someone to fit them? MCS-certified solar installers in Swansea are listed in the Solarable directory.
Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. The British median is 766 kWh per kWp. How we measure.
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How we measure
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