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 given diagram represents the way to generate

electricity

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in a hydroelectric

power

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station.

Overall

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,

electricity

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produces during the daytime starting from a river and ending up with a

generator

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,

while

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the used

water

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is re-pumped at night time. In detail, during the day,

firstly

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when a dam is opened,

water

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in the high-level

reservoir

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from a river flows to a

power

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station to produce

electricity

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. After that, the

water

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arrives at reversible turbines which operate a

generator

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.

Next,

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a

generator

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in the

power

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station lets the

water

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go to a low-level

reservoir

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,

also

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the generated

electricity

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is sent to a national grid by

power

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lines connected with the

generator

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, at the same time.

By contrast

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, at night, the

water

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from the low-level

reservoir

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is moved reverse to the high-level

reservoir

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, by crossing again the reversible turbines. The

water

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is pumped to the high-level

reservoir

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and after the pumping ends, the dam is closed to keep the

water

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stay inside the dam during nighttime.