If we don't need anything except the cleaner alternatives, we should start by banning and issuing laws against burning fossil fuel for connecting to the energy

If we don't need anything except the cleaner alternatives, we should start by banning and issuing laws against burning fossil fuel for connecting to the energy grid. This naturally include imports, as buying energy generated by burning fossil fuel outside the nations borders is just as bad as if the burning occurred inside. At that point people can choose between all the non-fossil fuel alternatives and pick what attributes they favor.