UK suppliers claim “100% renewable” even when selling fossil power at night.
Newly launched not-for-profit Matched Clean Power Index [1] shows, using open data, each supplier’s true renewable share hour by hour.
Built by a small team of engineers and energy analysts — including a former Tesla engineer — it combines half-hourly data from Elexon (demand), National Grid ESO (generation), and Ofgem (REGOs) to calculate the real renewable fraction for every major UK supplier. It’s the first open dataset of its kind [2].
The data exposes a £1 billion-a-year distortion: consumers pay for “green” certificates that don’t align clean supply with demand. Redirecting that could fund storage and flexibility instead.
The best suppliers match 69–88% of their demand with real-time renewables — far better than today’s “100%” claims.
We’d love your thoughts on:
– Next features/datasets: storage, nuclear, or CO₂ intensity?
– API design: what endpoints or update cadence would be useful?
– Visualisation: how would you show renewable matching over time?
[1] https://matched.energy/clean-power-index
[2] https://matched.energy/methodology/v1
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Source: matched.energy
