Writing Task 1: Process Diagram

The diagram below shows how geothermal energy is used to produce electricity.

Geothermal power plant

Sample Essay

The diagram displays how a geothermal power station generates electricity.

Overall, the station produces electricity in five main steps: pumping cold water underground, heating it, pumping heated water to the surface, converting it into steam, and using the steam to turn the turbine to create electricity.

First of all, cold water stored in the container is pumped down to the injection well that is 4.5 kilometers deep beneath the Earth’s surface. The well then injects the water into the geothermal zone where it is heated by hot rocks.

The superheated water is subsequently pumped above ground and into the condenser. Here, its pressure is lowered, which turns it into steam. As the steam passes through the turbine, it drives its blades to rotate. The spinning turbine then powers the generator connected to it to create electricity. Finally, the electricity generated is delivered to the power grid through power lines.

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