The Powerwall isn't an alternative for clean and sustainable energy. It is just another type of battery. It may or my not be better than deep cycle batteries currently in use. Time will tell if they last. The only clear advantage it holds is being smaller.
As the last image shows, you still have to power the Powerwall via some sort of energy generating device, like solar panels or wind turbine.
Thanks for reading in effect it has to power with solar panels.