An electric charging cable is seen connected to the updated Nissan Leaf vehicle during a news conference in Japan, Tokyo, on Tuesday, Nov. 20, 2012.
An electric charging cable is seen connected to the updated Nissan Leaf vehicle during a news conference in Japan, Tokyo, on Tuesday, Nov. 20, 2012.
Kiyoshi Ota—Bloomberg/Getty Images

How the homes of the future will generate and store their own electricity, turning your house into a mini-power plant.