sigh The issue is that paying ten times as much for one kind of green electricity as for another is mad. The entire point of any intervention in the electricity market is to reduce carbon emmissions and other pollutants yes?
There is a finite amount of capital/will/industrial capacity available to do this job. In Germany, it appears to have been admirably high, but when that enormous sum of money and good will gets wasted buying insanely overpriced solar power, very little CO2 gets displaced. I used nuclear as an example because it has low kwh costs, and that puts the issue in sharp contrast, but the basic problem is that the an extremely large amount of money has been spent and future commitments agreed to for depressingly weak results. That does not aid the future cause of green power in any way, shape or form.

It would be far more reasonable policy to tax coal at a rising rate until it goes away, as that would get actual zero-carbon capacity built in the order of "cheapest first", rather than "goldplated alter of Ra"