Which alternative power source are available to human? where are they found and how are they useful?

Which alternative power source are available to human? where are they

1.	Which alternative power source are available to human? where are they found and how are they useful?
Answer» ernative power sources APART from coal ENERGY and hydroelectric energy are solar energy, WIND energy, TIDAL energy, nuclear energy, GEOTHERMAL energy etc. 2. They are found in nature free of cost. The proper techniques are used to harness these renewable source of energy.