Regarding the drop of price of solar panel I don't think that it's not that uninteresting to invest in it. I'm all in to invest into renewable energy but I want

Regarding the drop of price of solar panel I don't think that it's not that uninteresting to invest in it. I'm all in to invest into renewable energy but I wanted to point out the hidden costs of deploying such technologies. But overall, if it's about CO² emission we want to reduce, I think it's way more efficient to invest into house/buildings isolation, heat pump and save 20 or more % of energy better than trying to invest massively into renewable energy that will gives non-controlled productivity.