Energy sources

Primary sources of energy are fossil fuels such as oil, natural gas, coal, and other sources such as nuclear, solar, wind, hydroelectricity, or potential sources available in oceans. It is estimated that there is 57 ZJ of oil reserves on Earth. This amount includes the available but not necessarily recoverable reserves. Energy of ocean can be categorized in three major methods; ocean wave power, ocean tidal power, and ocean thermal power. All of these three methods can be installed as on-shore or offshore applications. Geothermal energy is the utilization of heat stored in the inner layers of the earth or collecting the absorbed heat derived from underground. Biomass is a fuel that is also called biofuel, and the bio-energy is the energy enclosed in the biomass. Today, biomass has a small contribution to the overall energy supply, although it was the major fuel till the nineteenth century. Electric energy generation is a process where the energy sources or energy potential is converted to electrical energy. Energy generation can be done in various techniques.