Tidal and wave energy
If a dam or barrage is built across a river mouth or inlet, electricity can be obtained by the flow of water through turbines in the dam, due to the tide. The movement of waves can also drive air turbines to make electricity. Although tidal and wave energy don’t produce pollution, they can cause other environmental problems.
Biomass is material of plants and animals that can be used for energy.
Geothermal energy uses heat energy from beneath the surface of the earth.
Fast-flowing water released from dams in mountainous areas can turn water turbines to produce electricity.
Solar cells convert sunlight into electrical energy.
Moving air turns the blades of windmills or generators to make electricity or to pump water out of the ground.