Geothermal energy uses heat energy from beneath the surface of the earth. Some of this heat finds its way to the surface in the form of hot springs or geysers. Other schemes tap the heat energy by pumping water through hot dry rocks several kilometres beneath the earth’s surface. Geothermal energy is used for the generation of electricity and for space and water heating in a small number of countries.
Biomass is material of plants and animals that can be used for energy.
Fast-flowing water released from dams in mountainous areas can turn water turbines to produce electricity.
Solar cells convert sunlight into electrical energy.
Electricity can be obtained by the flow of water through turbines in a dam as the tide rises and falls.
Moving air turns the blades of windmills or generators to make electricity or to pump water out of the ground.