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 how a hydroelectric

power

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station

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operates to produce

electricity

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.

Overall

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, a hydroelectric

power

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station

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has two different modes of operating during day time and

night time

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nighttime

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. To make

electricity

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,

water

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flows from the river to the

generator

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and the generated

electricity

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is

then

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conducted to the national grid. During the day time,

water

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from rivers goes into a high-level

reservoir

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. By the

reservoir

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, there is a dam, which is open to allow

water

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from the

reservoir

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to run through a pathway.

This

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pathway leads the

water

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to the

power

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station

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. Here, reversible turbines are used to make the

generator

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functional.

Electricity

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generated by the

generator

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is transmitted through

power

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lines and

then

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distributed to the national grid for use. Meanwhile, after passing the turbines,

water

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continues to flow into a low-level

reservoir

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. The

power

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station

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also

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works at night but in

a

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apply

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reverse mode.

Instead

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of operating the

generator

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, the turbines pump

water

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from the low-level

reservoir

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in the opposite direction as it goes during the day, which means that

water

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moves towards the high-level

reservoir

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during the night.