And, on the flip side, Germany has massive tax subsidies for solar power. It's a lot easier to convince someone to get solar panels installed on their roof if you can show them a tax benefit for doing so.

On a broader note, I don't get why we think it's a good thing for Germany to have this much solar energy. Unlike, say, Spain, the German climate is not especially well suited to solar power. It's too far north, as a country, and climatically, Germany has a lot of cloudy days, which means that solar panels are not really running at peak efficiency most of the time. Germany would be much better served by wind power, because of its advantageous position on the North European Plain. In a free market, that is exactly what would have happened. Instead, German government subsidies have unfairly advantaged solar energy, leading to an inefficiently high number of solar panels and underinvestment in wind.