Have you noticed that plug-in electric vehicles are slowly trickling into the mainstream? If you haven't, you certainly will soon—major automakers like Nissan, Chevrolet, and Toyota all have plug-in electric or hybrid electric offerings set to roll off production lines in the next few years. But there's a catch: As it stands, the electrical grid can't handle the onslaught of electric vehicles that will all start charging at, say, 7 p.m. every evening when commuters get home from work. If everyone in your city or town started driving (and subsequently charging) EVs today, the grid would probably fail. So what can be done?