With the current CO2 certificate price it's doable and that price is only going up. Germany reduced carbon emissions by roughly 10% over the last two years. [0] The German "Energiewende" is mostly an example that politicians and the coal industry are slowing down technological progress. From 2008 to 2018 there was a whole decade of stagnation and suddenly they manage to trim the fat in just two years? CO2 pricing works extremely well but only if the price is high enough and only if the government isn't actively trying to dismantle the green tech sector.

[0] https://www.cleanenergywire.org/sites/default/files/styles/p...