'''Alternative fuels''' are defined by the [[United States|U.S.]] [[Department of Energy]] based on guidelines formed in the Energy Policy Act of 1992. Alternative fuels are those which are substantially nonpetroleum, yeild substatial energy security benefits, and offer substantial environmental benefits.<ref>[[United States|U.S.]] [[Department of Energy]]: Energy Efficiency and Renewable Energy, [http://www1.eere.energy.gov/vehiclesandfuels/epact/petition/index.html Alternative Fuel Designation Authority]</ref> | '''Alternative fuels''' are defined by the [[United States|U.S.]] [[Department of Energy]] based on guidelines formed in the Energy Policy Act of 1992. Alternative fuels are those which are substantially nonpetroleum, yeild substatial energy security benefits, and offer substantial environmental benefits.<ref>[[United States|U.S.]] [[Department of Energy]]: Energy Efficiency and Renewable Energy, [http://www1.eere.energy.gov/vehiclesandfuels/epact/petition/index.html Alternative Fuel Designation Authority]</ref> |