Let’s first understand what renewable energy sources are. Renewable energy sources are sources that are renewed naturally. Renewable energy sources include periodic or steady flows of energy distributed in nature and limited only by the stability of the Earth as a cosmo planetary element: radiant energy of the Sun, wind, hydropower, natural thermal energy, etc. There are such basic technologies of renewable energy as wind energy, hydropower, solar energy, geothermal energy, biofuel, bioenergy. Now in more detail.