The Diagram Below Shows How Geothermal Energy Is Used to Produce Electricity

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.

This essay question is from Cambridge IELTS 12 Test 8 Writing Task 1.

Geothermal power plant

the diagram below shows how geothermal energy is used to produce electricity

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.

150 Words

The Wrong Way to Write the Overview

Only summarizing the first and last steps is not enough. Please read the examiner’s comment on page 133 of Cambridge IELTS 16. Besides, although the diagram doesn’t show, the process is actually cyclical and so doesn’t end.

❎ Overall, the production of geothermal power is a man-made process, beginning with pumping cold water underground and end with using steam to turn the turbine to create electricity.

Careful!

There is an error in the diagram. Whatever the thing is in Step 4, it clearly isn’t a condenser. A condenser turns steam into water through cooling. It does not turn water into steam. However, we have to describe what the diagram depicts, so this cannot be helped. Just be careful not to write that the condenser brings down the water’s temperature because water turns to steam when you increase its temperature. Use “lower the pressure” instead: the condenser lowers the waters’ pressure and turns it into steam.

6 CommentsLeave A Comment

  1. Please give feedbacks
    The diagram displays the procedure of generating electricity in a geothermal power plant.

    Overall, the process consists of five stages before reaching to the required places beginning with cold water stored in a reservoir and ending up with creating the electricity.

    First of all, the cold water is pumped down 4.5 km from the surface via a pipe. In the next stage, the water have to pass the injection well where it is heated with the help of hot rocks. After passing along the geothermal zone, the water is then pumped up above the surface through the medium of production well where it is reserved in a condenser.

    Following this, the steam that comes out from the condenser after the water being condensed thrusts the turbine which will eventually leads the generator to be powered and produce electricity and then finally supplying it to the transmission tower before reaching to domestic household’s.

  2. This post is helpful. I made the same mistake mentioned starting with a process and ending with one in the overview part.

  3. please give feedback

    The diagram illustrates the process of the generation of electric power used by geothermal energy.

    Overall, the process takes five major steps to complete the whole process. Pumping cold water under the surface, heated it, hot water pumping up, converting it as steam, and the process finished with using the steam to turn the turbine to create electricity.

    First of all, the process starts with cold water pumping under the surface through the long injection well which is 4.5 km long, here in the geothermal zone water become hot to use hot rocks, then hot water pumping above the surface through the production well into the condenser, later that it converts as steam and pass 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.

  4. Actually i know that the ielts examiner don’t count one or two word and they mention that you have to write at least 150 words.Your answer are written at least 150 words.So,is there any chance to get lower marks because of it?

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