Windmill can generate 80% of home's electricity.

courtesy of http://www.time.com/time/2006/techguide/bestinventions/inventions/home5.html

Wind is a wonderfully renewable source of energy, but until now ordinary consumers who wanted to live off of–or contribute to–the electrical grid had no way to capture it. That's where the Skystream 3.7 comes in. It's a wind turbine designed especially for home use. Installed on a 35-ft. tower, it connects to standard utility hookups and starts turning in breezes as low as 8 m.p.h. It can provide up to 80% of the average household's electricity and shave $600 or more off annual utility costs.

Inventor: Southwest Power
Availability: Now; about $10,000, including installation
To learn more visit skystreamenergy.com