Tesla Motors Announces Powerwall ➝

Powerwall is a battery system designed to store energy for homes, companies, and utilities. The batteries can serve as backup systems during blackouts, store solar energy to be used during peak hours (when energy costs are at their highest), or allow owners to live completely off the energy grid.

The batteries will ship later this year and come in two models, 7kwh for $3,000 and 10kwh for $3,500