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 generation in a Hydroelectric power station by natural resources.

Overall

, it can be seen that

this

station produces electricity with the power of

water

which is flowing by a river in three general steps.

According to

the picture, in the first stage,

water

flowing from the river is sorted behind the

dam

.

Then

, the entrance of the

dam

opened in days and the flow of

water

generated electricity. In the

last

step, the generator which is located at the station transforms the power lines to the national grid by turbines.

However

, at night, the process is reversed and the rest of the

water

which is sorted as a low-level reservoir is pumped back the whole route to the

dam

to increase the level of sorted

water

again. And the entrance of the

dam

becomes closed at night.

Then

,

this

loop will be started again the next day.