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.

The given diagram illustrates the process of hydroelectric electricity generation in a special station.

Overall

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, it is evident that the process consists of 4 quite simple stages, beginning with the

water

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flow and ending with the transfer of the generated power through Power lines at daylight and the reversed process during the night.

At

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In

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the first step, the

water

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from the river and high-level reservoir. flows through an intake beneath the dam to the main generator during the day. Following that, the

water

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flow rotates the reversible turbines to lead them to operation and electricity generation; and in the final step, the hydroelectric power is transferred to the national grid by means of lines

which

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that

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are designed for

this

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purpose. During the night, the station works in reverse. At night, the turbines' function is to pimp the

water

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from the low-level reservoir to the High-level reservoir,

while

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the dam’s intake is closed in order to prevent the

water

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flow from the high-level source to the turbines.