Houses are ranked across ten categories (hence, the decathlon) ranging from affordability and energy balance to architecture and engineering. And you don't have to live near the nation's capital to see what it's all about: take a virtual tour of each of the homes here.
The event runs all week through October 2, and photos, video, and live updates are posted on the homepage daily. Here's a quick video describing what it's all about:
Wondering what you can do in your own home? Click here to learn more about creative ways to make your daily life more energy efficient.