The below shows how electricity is generated in a hydroelectric power station. the information by selecting and reporting the main features, and make comparisons where relevant.

The figure illustrates the production process of electricity from the

water

movement, which consists of different steps and complex structures. We can see that there are two reservoirs, where the

first

is at a high level and the

second

at a low level. Starting at the river, from which

water

flows into the high-level reservoir where they are stored. The dam encloses the reservoir, in order to control the movement of

water

in and back. During the day, the intake opens to allow the flow of

water

downward to generate electricity. Whereas, at night it returns back by pumping. Coming to the following step, In which reversible turbines and a generator are present inside the power station. These turbines operate the generator during the day by passing

water

to the low-level reservoir, which is considered the final line.

Consequently

, the

water

is pumped back by those turbines at night.

Finally

, Comes the generator which produces electricity and

then

transfers it through power lines into the national grid.