Renewable EnergyRenewable energy is defined as energy that is produced by natural resources-such as sunlight, wind, rain, waves, tides, and geothermal heat-that are naturally replenished within a time span of a few years.A renewable energy source means energy that is sustainable - something that can't run out, or is endless, like the sun.Sources of Renewable Energy1. Solar energy2. Wind energy3. Hydro energy4. Tidal energy5. Geothermal energy6. Biomass energy