Biodiesel is a type of biofuel made by combining animal fat or vegetable oil (such as soybean oil or waste used vegetable oil from restaurants and factories) with alcohol and can be directly substituted for diesel as a stand-alone fuel (called B100, for 100% biodiesel) or be used as an additive (called B20, for 20% bio-diesel). Biodiesel can be used in vehicles (newer cars, usually 1994 or later, are required for B100) and is beginning to be used in on-site electricity generation and heating applications.

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