The Diagram Below Shows How Electricity Is Generated in a Hydroelectric Power Station

Lilie King

Lilie King

Scored a 7 on the Writing Test Twice

This essay question is from Cambridge IELTS 14 Test 3 Writing Task 1.

The diagram below shows how electricity is generated in a hydroelectric power station.

Summarise the information by selecting and reporting the main features, and make comparisons where relevant.

Hydroelectric power station

The diagram below shows how electricity is generated in a hydroelectric power station

Sample Essay

The diagram displays how a hydroelectric power plant produces electricity.

Overall, the production of hydroelectricity is cyclical and consists of four main parts: storing water high, letting water flow downhill to generate electricity, storing water low, and pumping water back uphill for reuse.

First of all, the dam stores river water behind it in the upper reservoir that has an intake at the bottom. During the day, the intake is open, allowing water to flow through. As the water moves downhill into the lower reservoir, it passes through the turbines and turns their blades to generate mechanical energy. The spinning turbines then drive the generator to convert the mechanical power into electricity, which is subsequently delivered to the national grid through power lines.

During the night when demand for electricity is low, the turbines act as pumps that pump water kept in the lower reservoir back to the upper reservoir for reuse.

152 Words

How to Write the Overview

The process is cyclical and doesn’t end so you can’t say something like “end with”. Besides, it is not enough to only summarize the first and last steps. Read the examiner’s comment on page 133 of Cambridge IELTS 16.

✖️Overall, the production of hydroelectricity is a cyclical process and consists of five stages, starting with storing water in the high-level reservoir and ending with pumping water back uphill for reuse.

✔️Overall, the production of hydroelectricity is cyclical and consists of four main parts: storing water high, letting water flow downhill to generate electricity, storing water low, and pumping water back uphill for reuse.

How to Vary Your Language

Don’t worry about repeating “pump”. There is nothing at all wrong or unusual about saying that pumps pump. In fact, it shows the examiner that you can use “pump” correctly as both a noun and a verb. The three versions below are all good.

During the night, the turbines act as pumps that pump water stored in the lower reservoir back to the upper reservoir for reuse. 👍👍👍

During the night, the turbines serve to pump water stored in the lower reservoir back to the upper reservoir for reuse. 👍👍👍

During the night, the turbines act as pumps that move water stored in the lower reservoir back to the upper reservoir for reuse. 👍👍👍

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