Metered, not modelled
Portsmouth vs Darlington & Newton Aycliffe
Portsmouth roofs made about 19% more than Darlington & Newton Aycliffe roofs last year.
919 against 773 kWh per kWp at the median, from 203 and 247 real systems.
Darlington & Newton Aycliffe
773 median kWh per kWp
middle half 678–832 · 247 systems · 29th of 49
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 Darlington & Newton Aycliffe roof beats a poor Portsmouth one comfortably. Location moves the odds; it does not decide the outcome.
Portsmouth: the middle half of 203 systems made 844–963 kWh per kWp. Darlington & Newton Aycliffe: the middle half of 247 systems made 678–832 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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