Renewable energy sources: include geothermal, hydro, bioenergy, wind, and solar energy.
Geothermal energy: energy that is extracted from heat contained in the Earth’s core. Areas of geothermal energy are usually close to the boundaries of tectonic continental plates.
Hydro power: power derived from the energy of falling water or fast running water, which may be harnessed for useful purposes.
Solar energy: the use of the sun's energy either directly as thermal energy (heat) or through the use of photovoltaic cells in solar panels and transparent photovoltaic glass to generate electricity.
Bioenergy: energy derived from biomass which includes biological material such as plants and bacteria, wood, waste, (hydrogen) gas, and alcohol fuels.
Wind energy: electrical energy obtained from harnessing the wind with windmills or wind turbines.