A list of Renewable Energy Directories. The energy that comes from resources which are naturally replenished on a human timescale. Examples include sunlight, wind, rain, tides, waves and geothermal heat. Sources of alternative energy like solar and wind. Biomass is derived from living, or recently living organisms. Biofuels include a range of fuels which are derived from biomass. Geothermal energy is derived from thermal energy that is generated and stored in the Earth. Solar and wind related business directories.