Metered, not modelled
Oldham & Rochdale vs Wakefield
Oldham & Rochdale roofs made about 1% more than Wakefield roofs last year.
733 against 726 kWh per kWp at the median, from 133 and 63 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 Wakefield roof beats a poor Oldham & Rochdale one comfortably. Location moves the odds; it does not decide the outcome.
Oldham & Rochdale: the middle half of 133 systems made 681–758 kWh per kWp. Wakefield: the middle half of 63 systems made 601–814 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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