You do realize that while sunlight and wind are renewable, lithium-ion batteries are not, right? Nor are solar panels. Cadmium and lithium are highly toxic materials we must mine, just like coal. They have the benefit of not directly adding CO2 to the atmosphere as you use them -- but they come with their own set of issues. There is no free lunch. POW is Proof of Waste, and we shouldn't be blithely wasting any of these non-renewables.