This is exciting. Tesla's rechargeable lithium-ion battery for the home, Powerwall, looks like the Future. It may be the first viable option for supplying sustainable electricity to remote locations, dwellings during devastating natural disasters, and for those of us looking to unplug. Although only time will tell, combining Tesla's Powerwall with a good solar panel setup, will likely be the best option for anyone who needs electricity but looking to live, or already living untethered.