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

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

water

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

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

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

Correct pronoun usage

that

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are designed for

this

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

water

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

while

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

water

flow from the high-level source to the turbines.