This. Plus the fact that it would have been politically absolutely infeasible to get anyone except the Greens to agree on a coal before nuclear phase out at any point until at least 2018. SPD, CDU especially were and are very close to to the coal industry (voters, company boards, etc.).

In addition, without the Greens-pushed and initiated renewables subsidies, there would have been basically no big market worldwide for solar manufacturing to even be built out the way it was and all solar tech and industrialization would likely not be as good as it is now.