@Walter Hinteler,
Walter Hinteler wrote:
(Here, quite often, wind turbines don't work because the electricity companies can't handle the surplus of that electricity.)
I doubt that is the whole story. After all it is relatively easy to throttle back on the output of the gas turbine or nuclear power plants; a bit more troublesome with the coal-fired plants - if the wind turbines can produce steady levels of power. I suspect the issue may be fairly light and variable winds that yield only unsteady, low levels of power - something that can't be relied on to meet the slowly varying load on the electrical network.
That problem and the fact that the wind doesn't blow every day also means that, while wind turbines can produce relatively "green" power, they don't replace nuclear or fossil fueled plants on a one-for-one basis. The electricity companies must retain the generating capacity of more reliable plants.
Germany has invested heavily in wind power generation, but I noticed that your government has altered its former policy with respect to the formerly planned shutdown of its nuclear plants. I have wondered if some level of disenchantment with the economics of wind generation may be a factor in this.