Renewable Energy are natural resources such as sunlight, wind, rain, tides, and (geothermal) heat. They are an alternative from fossil fuels and nuclear power.
Wind: The turbines that are created from wind cause rotation of magnets which makes electricity
Geothermal: When the heat turns into steam it pushes the water back up which is used to turn turbines into electrical energy.
Tidal: When the tides come and connect with the water turbine they turn and that can turn an electrical turbine or gas compressor.