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

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of a hydroelectric power station producing and storing

electricity

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during the day and night.

Overall

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, during the day, the power produced in

this

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process

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mainly comes from the flow of

water

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from a high-level

reservoir

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to a low-level one

while

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at night, the

water

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is pumped back into the high-level

reservoir

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to regenerate

electricity

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the next day. In the daytime, the

water

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from the river accumulates in the high-level

reservoir

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which holds large amounts of

water

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before approaching the opening dam. In the meantime, some of the

water

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flows down before reaching reversible turbines connected to an operating generator which produces

electricity

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and

then

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delivers

electricity

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produced in

this

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process

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to the national grid via power lines. Afterwards, the

water

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is delivered into the low-level

reservoir

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. At night, the reversible turbines driven by the generator will pump

water

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from the low-level

reservoir

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back to the high-level one, which is the opposite

process

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from the daytime. The

water

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pumped up will be stored in the upper

reservoir

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and can be utilized to generate

electricity

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again the next morning.