Alternative energy is an umbrella term that refers to any source of usable energy intended to replace fuel sources without the undesired consequences of the replaced fuels.

350721881 a624f30e4e

The term “alternative” presupposes a set of undesirable energy technologies against which “alternative energies” are opposed. As such, the list of energy technologies excluded is an indicator of what problems that the alternative technologies are intended to address. Controversies regarding dominant forms of energy and their alternatives have a long history. The nature of what was regarded alternative energy sources has changed considerably, and today because of the variety of energy choices and differing goals of their advocates, defining some energy types as “alternative” is highly controversial.

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. Conventional fuels include: fossil fuels or petroleum, oil, coal, propane, and natural gas and nuclear materials such as uranium.

Some well known alternative fuels include Biodiesel, Bioalcohol such as methanol, ethanol and butanol, Chemically stored electricity (batteries and fuel cells), hydrogen, non-fossil methane, non-fossil natural gas, vegetable oil and other biomass sources.