If you've ever wondered what an extreme home makeover looks like for an environmentalist, take a visit to Lance Wright's garage in south Denver.

He walks past his electric car to batteries near the back wall. "All of this is the devices necessary to control our solar panels," Wright says.

There are solar panels on the roof above. He and his partner designed the system to maximize energy efficiency. K.K. DuVivier says that means the power moving through the meter is sometimes negative.