Biomass is organic material that comes from plants and animals, and it is a renewable source of energy.
Biomass contains stored energy from the sun. Plants absorb the sun's energy in a process called photosynthesis. When biomass is burned, the chemical energy in biomass is released as heat. Biomass can be burned directly or converted to liquid biofuels or biogas that can be burned as fuels.
Examples of biomass and their uses for energy
Wood and wood processing wastes—burned to heat buildings, to produce process heat in industry, and to generate electricity
Agricultural crops and waste materials—burned as a fuel or converted to liquid biofuels
Food, yard, and wood waste in the garbage—burned to generate electricity in power plants or converted to biogas in landfills
Animal manure and human sewage—converted to biogas, which can be burned as a fuel
However, the only realistic use of biomass energy for a homeowner is wood fuel pellets used in stoves and heaters.