Should beware of biased accounts of solar panel production costs, they are actually rotinely cheap now, with no rare material requirements. Fossil fuels still have a very deep grip of industry and finance, which stands to be bowled over by solar. They are anxious to keep us believing solar is not cost effective. Notice that they deliberately do not point out that the Joules of energy received from solar are additional physical product added to to Earth capital, therefore should be reflected by the issue of free money, per the ideals of Austrian economics. But the fact that proof of work cryptocurrencies physically do that already means they can't keep ignoring it forever. Sooner or later, they will have to begin issuing solar backed free money to compete with solar powered cryptocurrencies.
That changes everything.
