Earthships; a money and earth saving home building method

http://www.earthship.com/buildings

"Reduce and even eliminate your utility bills.

• Get ALL of your electricity from the sun and the wind.
• Catch water from the sky for drinking, bathing, cleaning, showering, washing, flushing, etc.
• Contain and treat ALL of the sewage you produce in a healthy and beautiful way.
• Maintain comfortable temperatures in your building ALL year long, in any climate. Reduce or even eliminate your heating and cooling bills."

Such are the claims for Earthship homes.  Here's an article on one in Montana. And here's a youtube tour of one being built.

These houses are labor-intensive to build and require learning how to maintain them, but after that it's smooth sailing and cost-saving.