Metered, not modelled
Sheffield vs Leeds
Sheffield roofs made about 6% more than Leeds roofs last year.
792 against 747 kWh per kWp at the median, from 107 and 434 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 Leeds roof beats a poor Sheffield one comfortably. Location moves the odds; it does not decide the outcome.
Sheffield: the middle half of 107 systems made 743–835 kWh per kWp. Leeds: the middle half of 434 systems made 677–802 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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