The energy which replenishes itself quickly and which is available in never ending supply is called renewable energy. The renewable energy comes from natural resources like sun, wind, water (tides and rainwater), heat from the earth (geothermal heat), biomass etc. There is no end to the renewable sources of energy on earth. As long as human life is there, there will be earth, sun, wind and water, and the energy from these sources will also be available as long as they are there.
Some brief details of commonly used renewable energy sources follows:
1) Solar energy from sun: This is one of the most commonly used renewable sources of energy. Solar energy is being currently tapped for food cooking, water heating, electricity generation, lights, etc. The solar collectors are installed that collect the solar energy and convert it into various forms.
2) Wind energy: Wind energy is being used extensively for generation of electricity. Huge fans are installed to tap the wind energy and convert it into electricity for domestic as well as commercial applications. It is popular in countries like India, China, US, Denmark, etc.
3) Geothermal energy: The heat from the earth is called geothermal energy. It can be used to heat water, generate electricity, etc.
4) Biomass energy: This is the energy stored in the organic matter generated by the plants and animals.
5) Water energy: The energy obtained from tidal waves, rain water, etc. is the renewable energy obtained from water.