Cleantech America, a San Francisco based developer, has launched a project to build the world's largest solar farm, giving this Spanish solar tower a run for its money, as well as insulting the work of countless Tesco engineers and their puny, insignificant solar roof. When completed in 2011, the 80-megawatt spread of solar panels will cover roughly 640 acres and be 17 times the size of the largest US solar farm in existence. The project, which will generate enough power for nearly 21,000 homes, will be sold to the Kings River Conservation District, a public agency that purchases power for 12 cities and two counties in California's Central Valley. The company hopes that a solar farm of this size will be an industry-wide tipping point for energy providers, and will drive the cost of solar energy downward. Meanwhile, Tesco and Spain will be plotting their sublime revenge.