Sky-scraping Tower Will Power 100,000 Homes with Hot Air

A 2,600-foot tower planned for the Arizona desert will be the world's second tallest structure and will be able to power 100,000 homes through hot air alone.

The solar updraft tower, designed by EnviroMission, will work by collecting hot air as it rises from the heated ground surrounding it.  The very tall, narrow tower increases the strength of the hot air flowing upward, where it will turn 32 turbines along the way.