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

electricity

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generation in a hydroelectric power station.

Overall

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, there are four stages to

this

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cyclical

process

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, and the main steps are storing

water

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, managing

water

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flow, and the operation of

turbines

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and generators. The

process

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begins as

water

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is

channeled

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channelled

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from the river and stored in a high-level

reservoir

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behind a dam. During daylight hours, the dam is opened to allow the stored

water

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to flow towards reversible

turbines

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. Simultaneously, these

turbines

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operate generators, producing

electricity

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from

water

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flows. The generated

electricity

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is

then

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transmitted to the national grid via power lines. After passing through the

turbines

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,

water

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is pumped into a low-level

reservoir

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. During the night, the

process

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shifts, with the reversible

turbines

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now acting as pumps to retrieve

water

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from the low-level

reservoir

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.

This

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water

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is

then

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transported back to the high-level

reservoir

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, positioning it for the next cycle of

electricity

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generation.