Sadly all this is despite the German governments best efforts. For a few years recently they really tried to limit the growth of renewables. At least when it comes to small and medium network-connected installations. For small installations the credits got rather abruptly reduced. Slightly bigger Installations (>10kw) now have to pay VAT on the power they generate and use themselves. The overall amount of installed renewables got Hard-limited (I assume new installations wont get approved once its reached).
The way the credit system for the renewables works also causes really high electricity costs for private households and small businesses. Basially the cheaper electrical power on the spot market gets the more expensive the electricity gets. This is made worse by market effects cause baseline power plants to run for power export purposes. Running the plants causes the price of power on the national spot market to go actually negative but the power is then actually sold at a profit to neighboring countries.
What makes the prices even higher is the fact that big users of electricity get an exception from paying into the renewable credit scheme. In fact the more power you use the easier this is to get.
The increasing cost is used by the Government to sell the reduction in credits and the limiting of renewable installations to the voters.
Anway wikipedia has the bare facts if you want to read it:
https://en.wikipedia.org/wiki/...
I really think that germany now needs a energy storage promotion law but it seems like the current government won't really do anything in that direction. Instead there is talk of really stupid "smart" grid schemes backed by smart meters.