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 of

electricity

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generation in a hydroelectric power station, highlighting both the daily and nightly operations. During the

day

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,

water

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from a high-level

reservoir

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flows through an intake, which is open during the

day

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,

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apply

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and moves towards a power station.

This

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flow of

water

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turns

reversible

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into reversible

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turbines

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, which are connected to a generator. As the

turbines

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spin, they generate

electricity

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, which is

then

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transmitted through power lines to the national grid. At night, the intake is closed, and the process is reversed. The reversible

turbines

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, now functioning as pumps, move

water

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from a low-level

reservoir

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back up to the high-level

reservoir

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.

This

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process requires

electricity

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, which is often supplied by other sources when demand is lower, ensuring that

water

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is available in the high-level

reservoir

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for the next

day

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's

electricity

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generation. The dam plays a crucial role in maintaining the

water

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levels,

while

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the reversible

turbines

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enable the dual functionality of generating

electricity

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during the

day

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and pumping

water

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at night.