What's billed as the biggest roll-out of electric vehicle infrastructure in the world is about to begin in the United States. Urban planners are deciding where to locate more than 11,000 charging stations in 11 major cities. They want those stations up and running when the first mass-market electric cars from Nissan and General Motors go on sale at the end of this year. Last year, the Department of Energy awarded $100 million to eTec, an electric transportation research and development firm, to build electric vehicle charging networks in five states. eTec is installing more than 2,000 electric car chargers in the greater Seattle area in western Washington, and another 2,000 at homes and public places in four Oregon cities. They'll be near shopping centers, fast food restaurants and movie theaters, "the variety of places that people think about when they're able to park and leave the vehicle for an hour or two."