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Biogas
is the gas produced by the anaerobic digestion or fermentation of organic matter including manure, sewage sludge, municipal solid waste, biodegradable waste.
Biomass
is any material that can be obtained from a growing, living or recently dead biological organism. This can include grass, wood from trees, husks from corn, waste from humans and animals, etc.
Geothermal energy
is derived from the heat in the interior of the earth. The energy originates from the original formation of the planet, from radioactive decay of minerals, and from solar energy absorbed at the surface.
Hydropower
is the power that is derived from the force or energy of moving water.
Renewable energy
is any energy resource that is naturally regenerated over a short time scale and derived directly from the sun (such as thermal, photochemical, and photoelectric), indirectly from the sun (such as wind, hydropower, and photosynthetic energy stored in biomass), or from other natural movements and mechanisms of the environment (such as geothermal and tidal energy). Renewable energy does not include energy resources derived from fossil fuels, waste products from fossil sources, or waste products from inorganic sources.
Solar energy
is the radiant light and heat energy from the Sun.
Tidal energy
is the energy contained in a tide flowing in or out of an estuary or similar enclosed place.
Wave power
is the power in ocean surface waves.
Wind energy
is the energy in moving air masses. The movement is caused by temperature and pressure differences in the atmosphere.
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