Ok... but now we're damaging ecosystems by installing hydroelectric power stations and dams and such in these areas.
Besides, not every country can effectively utilize hydroelectric power.
Germany, like other countries, should be investing in a mix of power sources. You probably want your backbone to be nuclear and then renewables where it makes sense with a goal (at least in western countries) of also eliminating reliance on China for renewables/batteries.
Dogmatism about renewables is self-defeating.