I’m pretty sure this is exactly what Elon Musk had in mind when he announced Powerwall.
From Yahoo News:
As renewable-energy use becomes more widespread, energy storage could become a major business.
Using stationary battery packs to store energy increases the effectiveness of wind and solar.
Tesla Motors hopes to exploit this potential market with packs that use the same lithium-ion cells as its electric cars.
But researchers at Harvard believe there is another configuration that could better suited to energy storage.
Professor Michael Aziz and his team are researching flow-cell batteries, believing they have certain properties that make them a better choice for this type of use, according to Gizmag.
This is wonderful news for Tesla, as well. They will be able to use their battery factory to produce batteries for their cars and for other cars.