The diagram below shows how electricity is generated in a hydroelectric power station. Summarize the information by selecting and reporting the main features, and make comparisons where relevant. Write at least 150 words.

The diagram outlines the

process

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of

electricity

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production in a hydroelectric

power

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station

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. The

process

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begins when the

water

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flows

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from the

river

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into a high-level

reservoir

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and ends with the transmission of

electricity

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to the national grid. In general, the

process

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is broadly distributed into

day

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and

night

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stages with the daylight stages involving

electricity

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production from a

river

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and storage of

water

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in a

reservoir

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. At

night

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, the

water

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flows

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back in the opposite direction towards an initial

reservoir

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and the

river

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. The

day

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stage of the

process

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involves channelling the

river

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water

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into a high-level

reservoir

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backed up by a dam. There is an intake area leading to the

power

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station

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that opens during the

day

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and closes at

night

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.

Water

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flows

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during the

day

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to generate

electricity

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through the

power

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station

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turbines. The generated

electricity

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is

then

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sent to a national grid through

power

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lines

while

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the excess

water

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runs to a low-level

reservoir

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. During the

night

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stage, the

water

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stored in the low-level

reservoir

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is reverted to the

power

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station

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and the turbines of the generator pump it back into the high-level

reservoir

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which is closed during the

night

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. The

river

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water

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is stored at the upper level and later it

flows

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down, starting the cycle again.