Biofuels, a renewable energy source that can be stored and transported in a manner similar to fossil fuels, can often be used in existing equipment and be blended with petroleum fuels

Biodiesel is a domestically produced, renewable fuel that can be manufactured from vegetable oils, animal fats, or recycled restaurant grease for use in diesel vehicles. Biodiesel’s physical properties are similar to those of petroleum diesel, but it is a cleaner-burning alternative. Using biodiesel in place of petroleum diesel reduces emissions. In Hawaii, biodiesel is locally produced by Pacific Biodiesel, with plants on Maui, Oahu, and the Big Island.

Ethanol is a normal component of today’s gasoline. Over 40% of the gasoline in the U.S. contains ethanol, and the percentage is projected to continue to increase. Hawaii State law requires all gasoline sold for vehicles to have 10% ethanol blended (E-10). Ethanol is an alcohol based fuel produced from plant sugars such as corn and sugarcane or from cellulosic feedstocks (grass, wood, crop residues, or old newspapers). Ethanol enhances the octane properties of gasoline and is used as an oxygenate to reduce CO emissions.