Water Wheel: this tiny hydroelectric turbine is one of four technologies that keeps Gaviotas off the national grid. It generates 30 kilowatts off a 1-meter drop in a low-fall dam.
http://money.cnn.com/2007/09/26/technology/village_saving_planet.biz2/index.htm
21-year-old student/inventor/entrepreneur Emily Cummins has designed a brilliant portable solar-powered refrigerator that works based upon the principle of evaporation. Employing a combination of conduction and convection, the refrigerator requires no electricity and can be made from commonly available materials like cardboard, sand, and recycled metal.
http://www.inhabitat.com/2009/01/12/solar-powered-fridge-by-emily-cummins/
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