@KasperNicolaisen they can't easily reduce consumption, indeed. But the protesters are asking the government to do something difficult, but not impossible. The protest is not meaningless or naive from this perspective.
I actually learned that RWE doesn't export much coal, so I am wrong about that. Still, if other countries banned exports that would be further pressure to move to renewables. Coal is used because it is cheaper and easier than reducing consumption.
Another thing I learned is that the German government is paying RWE a ton of money as compensation for phasing out coal in 2030, to replace the profits they theoretically would have had. Not only that, RWE is suing the Netherlands because they decided to phase out coal without paying them off.
Basically Germany is making deals with a scummy private company and burning more coal because it's easier than reducing national energy use.