DENVER
03/18/2010 05:12 am ET | Updated May 25, 2011

Developer builds eco-community in Boulder

BOULDER, Colo. - What it means to be zero energy:

Ultimately, a zero-energy home should create as much electricity as it uses over a year.

Often, that means that the house is producing far more electricity than it uses in the summer when the sun is strong and high

Read more on The Aspen Times