Renewable

Sources whose energy flow replenishes on a human timescale from the sun, gravity, the earth's interior heat or living biomass grown and harvested rather than mined, including solar power, wind power, hydropower, geothermal energy, tidal and marine energy, biogas, biofuels and biomass energy. Belongs here: any source the International Energy Agency and the United States Energy Information Administration classify among renewables in their published statistics, drawing continuously replenished natural flows rather than a depleting stock. Does not belong here: firewood and charcoal, which are biomass but are tracked separately as Traditional Biomass because of their distinct low-efficiency, health and deforestation profile in energy statistics; waste-to-energy, tracked apart as Waste Derived because not all waste feedstock is biogenic.