The diagram below shows how electricity is generated in a hydroelectric power station.

The diagram above illustrates the process of

electricity

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generation at a hydroelectric power station. There are two distinct operations for producing

electricity

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: daytime and nighttime. During the

day

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, water flows from a higher to a lower reservoir, and at night, it is pumped back in a reversed way to be used for the next

day

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.

First,

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an artificial lake created by a huge dam is connected to a river; under the dam is an intake gate

that is

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opened during the

day

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and closed at night. The process begins in the daytime when, under the force of gravity, water flows down to spin the turbine inside the power station so that

electricity

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is produced, going across the power lines and to the national grid. At night, water from the lower reservoir is pumped back to the higher one by the same turbine used for

electricity

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generation during the

day

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. The procedure starts all over again the

day

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after.