Back in March power company AES invested $3 million in Altairnano. The home energy storage units could act as buffers to absorb power when there is an excess and release it when there isn't enough. The system could be used to store energy from solar panels or wind turbines for use when it's needed. If enough of these types of systems are installed in peoples houses it could allow power companies to put off building additional generating capacity.
[Source: CNET via Engadget]