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Germany just now approved new laws that make setting up solar on your balcony super easy
(www.tagesschau.de)
Everything about energy production and storage.
Related communities:
At least in Germany it is legally required that rooms get a certain amount of natural light. There are transparent solar panels in development though, which could be just as much as a foil being put onto the glass itself. Not as effective of course, but still.
The stuff about rooms having solar access are for designers and architects to ensure they design to put those rooms in appropriate places to get those rates
Also to protect against development that would shade such a room (but actually the whole yard in my jurisdiction)