Germany has a feed-in law. Meaning: solar panel installers who connect to the grid can sell their surplus electricity at a fixed price to the distribution companies, a price still well above market price (though, heh, below some peaks of market-traded electricity).

To give you a figure, a roof-mounted array of 31 kW gets 46.82 Euro-cents/surplus kWh if installed this year (this figure is reduced for new plants by 5% each year).

_{*Lunatic*, n.
One whose delusions are out of fashion.}