Batteries are the future, and it's battery technology that desperately needs to take a significant leap forward to allow us to really advance to where we want to go with our consumption of power and the role it plays in our mobility and use of mobile devices.The biggest issue I see with this idea is the accelerated degradation of batteries as their life cycle is spent more rapidly due to added uses, for it to be a fair exchange for the average person, the power that is sold back to the grid from the battery would have to be sold back at a higher price to cover the wear and tear on the battery, and maybe even a bit extra to encourage acceptance of this technology. Without this foresight it would become common for some people to fit systems that allow the flow of electricity in only one direction, to the battery and never back to the household. This assumes an ownership model like we currently have, rather than a service model of ownership where users are merely renting a vehicle, but this doesn't answer the question of who absorbs the cost of battery degradation.Fingers crossed Tesla and other companies manage to develop new battery technology that can last a near infinite number of charging cycles spanning decades, and hold more power than ever before. Power stations are built to last half a century or more, in terms of waste that is very efficient compared to every other household having to replace industrial batteries every 7 years or so... a humongous waste problem waiting to happen unless we can develop the technology to avoid this as soon as possible.(sorry for big paragraph, my browser gets rid of paragraphs for some reason!)