SUNLIGHT in a direct fashion.The process of conversion of solar energy into electric energy is called a Photovoltaic Effect. Biogas is produced naturally from the decomposition of natural waste.It PRIMARILY consists of Methane and CARBON dioxide.Nuclear Energy:It is known as atomic energy.It is a renewable source of energy.The RELEASE of energy through nuclear reaction is used here.Nuclear fission, nuclear decay, and nuclear fusion of RADIOACTIVE materials are used to generate thermal power.Wind Energy:Wind energy is harnessed by using a wind turbine generator.Wind turbines convert the energy in wind to electricity by rotating propeller-like blades around a rotor.The rotor turns the driveshaft, which turns an electric generator.Geo-Thermal Energy:Geo-Thermal-Energy harnessed from the heat inside the earth surface