Alternative sources of energy are the sources of energy that are not produced form burning fossil fuels. Alternative energy has no polluting affects and is freely available for use.
The various sources of alternative energy include
Solar energy- It is the alternative energy that is obtained from the sun. Solar energy is available in the form of heat and light. This source of alternative energy can be used for generating electricity, heat water, keep buildings warm and to cook food. Solar energy can be harnessed using devices like solar cells, solar panels etc.
Bio diesel- These are clean, biodegradable and non toxic fuels that can be used as an alternative energy source. They can be used effectively in place of diesel for running diesel vehicles.
Wind energy- The kinetic energy of the wind is called wind energy. It can be harnessed using wind turbines. The wind energy can be used to generate electricity, for sailing, for pumping water and for grinding grains.
Geothermal energy- The energy found in the interior of the earth is called geothermal energy. It is an alternative energy source that is clean and reliable. It is mainly used for generating electricity.
Tidal energy- The energy possessed by tides is called tidal energy. It is an alternative energy source whose main use is the generation of electricity.
The main problem that is encountered in the use of alternative energy sources is the cost of harnessing. Techniques need to be developed that reduce these costs so that alternative energy sources can be easily used.