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 comparison where relevant.

The diagram below illustrates the generation of electricity inside the hydroelectric

power

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station

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. The procedure is divided into two parts based on the activity of the

power

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station

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during the day and night.

Overall

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, the electricity is only generated every time the sun is up and stopped every evening.

Firstly

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, the

water

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from the river is collected inside the high-level

reservoir

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, near the

dam

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.

Following

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this

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, during the day, the door of the

dam

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will open, making the

water

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flow through the pipe, creating electricity which will move the generator inside the

power

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station

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with the help of the turbines. The

water

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then

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reached the downstream, inside the low-level

reservoir

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. The

power

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created by

water

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is

then

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supplied to the National Grid through the

power

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lines. In the evening, the turbines are reversed to pump out the

water

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back to the high-level

reservoir

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.

Furthermore

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, once the

water

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has passed through the

dam

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and reached the

reservoir

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, the

dam

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is

then

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closed.

This

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cycle will repeat every day and night in the hydroelectric

power

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station

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.