Synonyms: non-conventional fuels, advanced fuels, non-polluting fuel
Materials or substances other than conventional fossil fuels or nuclear materials which may be burned in order to generate energy.
Alternative fuels, 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, as well as nuclear materials such as uranium. Some well known alternative fuels include biodiesel, bioalcohol, chemically stored electricity, hydrogen, non-fossil methane, non-fossil natural gas, vegetable oil, and other biomass sources.