The diagram below shows how geothermal energy is used to produce electricity.
Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
The diagram illustrates the process by which geothermal energy is used in the production of electricity.
Overall, there are five steps in the process, starting from pumping down cold water into the geothermal zone and ending with the production of electricity from the generator which is then sent into the electrical grid.
In the first step, cold water is pumped down 4.5 km underground through the injection well followed by the injection of water into the geothermal zone, where hot rocks heat the water up as it passes through the Earth. Once the water has been heated up, it enters the production well and is then pumped up to the ground and into the condenser.
The last two stages are carried out above ground at the power plant. First of all, steam is produced from the hot water in the condenser and in the following step, the steam is passed into the turbine which makes it spin. Finally, the generator, which is powered by the turbine, produces electricity which is then transferred into the electric grid via power lines.