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

The diagram illustrates the process of electricity generation in a Hydroelectric power station by natural resources.

Overall

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, it can be seen that

this

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station produces electricity with the power of

water

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which is flowing by a river in three general steps.

According to

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the picture, in the first stage,

water

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flowing from the river is sorted behind the

dam

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.

Then

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, the entrance of the

dam

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opened in days and the flow of

water

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generated electricity. In the

last

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step, the generator which is located at the station transforms the power lines to the national grid by turbines.

However

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, at night, the process is reversed and the rest of the

water

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which is sorted as a low-level reservoir is pumped back the whole route to the

dam

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to increase the level of sorted

water

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again. And the entrance of the

dam

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becomes closed at night.

Then

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,

this

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loop will be started again the next day.