I thought the point of renewables is that they have very little cost to society. There is no CO2, NOx, heavy metal pollution, mine tailings, etc. There is a small amount of pollution related to the manufacture of solar panels, windmills, etc. but beyond that, there is no ongoing pollution as there is with fossil fuels.
You seem to think that they should pay a tax for retraining workers... perhaps, but that is also a very small amount compared to the amount of energy generated and is covered by existing government programs.
So, what is the rationale for taxing renewables?