The world relies heavily on coal, oil, and natural gas for its energy. Alternative fuels, also known as non-conventional or advanced fuels, are any materials or substances that can be used as fuels, other than conventional fuels such as fossil fuels (petroleum (oil), coal, propane, and natural gas) and nuclear materials (uranium).Fossil fuels are non-renewable, that is, they draw on finite resources that will eventually dwindle, becoming too expensive or too environmentally damaging to retrieve. In contrast, renewable energy resources-such as wind and solar energy-are constantly replenished and will never run out.
Some well known alternative fuels include biodiesel, bioalcohol (methanol, ethanol, butanol), chemically stored electricity (batteries and fuel cells), hydrogen, non-fossil methane, non-fossil natural gas, vegetable oil and other biomass sources. There is growing perceived economic and political need for the development of alternative fuel sources due to general environmental, economic, and geopolitical concerns of sustainability.
Solar Energy
Solar power is the generation of electricity from sunlight. This can be direct as with photovoltaics (PV), or indirect as with concentrating solar power (CSP),
where the sun's energy is focused to boil water which is then used to provide power. wikiWind Power
Hydrogen Energy
Bioenergy
Hydropower
Geothermal Energy
Ocean Energy
Green Power
Ethanol
http://www.ethanolrfa.org/
