Metered, not modelled
Nottingham vs Scottish Borders
Nottingham and Scottish Borders roofs made much the same last year.
758 against 757 kWh per kWp at the median, from 228 and 163 real systems.
Where the two actually overlap
Both areas, grouped by what each system made. The medians differ, but the shapes sit largely on top of one another — a good Scottish Borders roof beats a poor Nottingham one comfortably. Location moves the odds; it does not decide the outcome.
Nottingham: the middle half of 228 systems made 683–816 kWh per kWp. Scottish Borders: the middle half of 163 systems made 709–831 kWh per kWp.
Both figures are what real systems metered last year, so the gap mixes sunlight with system age, roof direction and shading. It is the difference in what people actually got, not a difference in sunshine alone.
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Output figures from openclimatefix/uk_pv (Hugging Face, CC-BY-4.0), collected by Sheffield Solar. How we measure.
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