I have a solar array on my roof. If I find my house in OSM, there’s a lightning bolt icon indicating there’s a solar array present. Not only that, but the exact layout of the panels in my roof is shown. I never submitted this info to anyone, Google Maps Satellite view doesn’t show them. I’m really curious where OSM got such detailed data.
@nudnyekscentryk @bruhbeans IIRC, there was a project in the UK which tried to map as many as possible, in order to predict fluctuations in electricity supply.
We know where clouds are with good precision. If we can match this with the locations of solar panels + some math, they could predict small fluctuations.