Energy
...eam. Holes are drilled down to the hot region steam comes up. • Geothermal energy does not produce any pollution, and does not contribute to the greenhouse effect • The power stations do not take up much room, so there is not much impact on the environment. • No fuel is needed • Once you've built a geothermal power station, the energy is almost free. It may need a little energy to run a pump, but this can be taken from the energy being generated. Hydro Electric A dam is built to trap water usually in a valley where there is an existing lake. Water is able to flow through tunnels into the dam to turn turbines and drive the generators. The Sun evaporates water from the sea and lakes, which forms clouds and falls as rain in the mountains, keeping the dam supplied with water. • Once the dam is built, the energy is virtually free. • No waste or pollution produced. • Hydro-electric power stations can increase to full power very quickly, unlike other power stations. • Electricity can be genera...