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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.
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Basically that. As long as he's using 100% himself it doesn't really matter, but a friend of mine has one of those old Ferraris meters and getting full price for every kWh fed to the grid means, the whole thing pays for itself within two years.