The diagram below shows how electricity is generated in hydroelectric power station. summarise the information by selecting and reporting the main features, and make comparisons where relevant.

The diagram illustrates a hydroelectric power plant and its process of generating electricity.

Overall

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, the process can be divided into two major steps: riverside and the power station which both can function differently

according to

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the time of the day.

Firstly

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, there is a dam constructed to accumulate

water

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which has a narrow passage beneath

that is

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only open during the day for

water

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intake.

This

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natural flow of liquid generates electricity in the daytime. Afterwards, it finds its way to the generator which consists of reversible turbines that operate before night-time and are connected to power lines and the national grid. At

last

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, the

water

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would be discharged into the low-level reservoir.

However

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,

this

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process is reversible during the night-time which begins with the flow of

water

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from the lower level part of the river into the turbines which pump it upwards, initiating it to pass along the previously-mentioned narrow line beneath the dam, into the high-level reservoir.