That's a highly dubious claim. While the claim of 50% of German power is at least supportable as "installed" capacity, Myk's claim that Germany's renewable power sources are insignificant, and that coal usage in Germany is increasing are both demonstrably wrong.
Also, most include hydro power as a renewable. And if we add up all "non-emitting" sources (which includes nuke), then Germany is doing quite well as that total approaches 50% of generated power.
those claims are not demonstrably wrong as supported by your own data. and who cares about installed capacity, it's the manner in how electricity is actually being produced that matters. your own data does not even back up your claims:
clean energy = 20% of total output (wind, solar, hydro)
also, there's no way one should include nuclear in that just because it doesn't have traditional emissions of coal, gas,etc. to me that's laughable and poor science.
but, even if you do include nuclear
clean energy = 37.5% of total output, still not near 50%
We don't know what our limits are, so to start something with the idea of being limited actually ends up limiting us.
Ellen Langer