Energy from the sun that is converted into thermal or electrical energy.

A solar panel is made of the natural element, silicon. In sunlight, the panel becomes charged and produces electricity.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Solar_power

http://home.clara.net/darvill/altenerg/solar.htm

Wind power is the conversion of wind energy into more useful forms, usually electricity using wind turbines.

Source: WordNet (r) 1.7

Wind Power Video-Modern Marvels -MSN


http://en.wikipedia.org/wiki/Wind_power

http://home.clara.net/darvill/altenerg/wind.htm

Biomass refers to living and recently living biological material which can be used as fuel or for industrial production.

Most commonly biomass refers to plant matter grown for use as biofuel, but also includes plant or animal matter used for production of fibres, chemicals or heat.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Biomass

http://home.clara.net/darvill/altenerg/biomass.htm

Biodiesel is a light to dark yellow liquid. Biodiesel can be used in pure form (B100) or may be blended with petroleum diesel at any concentration in most modern diesel engines. Biodiesel can also be used as a heating fuel in domestic and commercial boilers.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Biodiesel

http://www.eere.energy.gov/afdc/altfuel/biodiesel.html

"Geo" means earth, and "thermal" means heat. Three types of power plants are used to generate power from geothermal energy: dry steam, flash, and binary.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Geothermal_power

http://home.clara.net/darvill/altenerg/geothermal.htm

Hydroelectric power, or hydroelectricity, is generated by the force of falling water. It is one of the cleanest sources of energy, and it’s also the most reliable and costs the least.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Hydroelectricity

Hydrogen can be produced from a variety of resources (water, fossil fuels, biomass) and is a byproduct of other chemical processes. Unlike electricity, large quantities of hydrogen can be easily stored to be used in the future.

Hydrogen can also be used in places where it’s hard to use electricity. Hydrogen can store the energy until it’s needed and can be moved to where it’s needed.

Source: WordNet (r) 1.7

Hydrogen Power

Ethanol, also known as ethyl alcohol or grain alcohol, is a flammable, colorless, slightly toxic chemical compound with a distinctive perfume-like odor, and is the alcohol found in alcoholic beverages.

The largest single use of ethanol is as a motor fuel and fuel additive.

Source: WordNet (r) 1.7

http://en.wikipedia.org/wiki/Ethanol