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Copyright 2008-10,
CaliforniaPHOTON.com
V 1.06
site last updated: 6/26/2010

C a l i f o r n i a   P H O T O N

Renewable Energy Sources

Renewable energy is energy produced from sources that are continuosly replenished by nature. The widespread and abundant renewable energy sources fall into four categories. The medium conducting energy of each of these four categories correspond to one of the four states of matter, and even, if only metaphorically, to one of the four or five ancient elements.

energy type example state of matter ancient element
geothermal ground-source heat pump solid earth
water wave or current wave buoy liquid water
wind wind turbine gas air
sunlight rooftop solar panel plasma fire