Biomass is material from living, or recently living organisms, most usually plants or plant-derived materials. As a renewable energy source, biomass can either be used once - directly, or indirectly - or converted into another type of energy product in one of three ways: thermal conversion, chemical conversion, and biochemical conversion. Plant matter biomass can be used to generate electricity via steam turbines or gasifiers. Wood remains the largest source of biomass energy.
Biomass also includes plant or animal matter that can be converted into fibers or other industrial chemicals, including biofuels. Industrial biomass can be grown from numerous types of plants, including corn, hemp, sugarcane, bamboo, and a variety of tree species, including willow and oil palm.