On the national mall from September 23rd to October 2nd, you can tour 19 solar powered homes designed and built by teams of college students from around the world, as part of the U.S. Department of Energy “Solar Decathlon.” As the name suggests, the houses go through 10 contests, which include household tasks (e.g. laundry, hosting a dinner party), monitored performance (e.g. maintaining a comfortable temperature and humidity) and other judged characteristics (e.g. aesthetics, design). The winning team’s house must be affordable and easy to live in, and produce as much or more energy than it consumes. Come see these houses – you will definitely want to live in one!