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 given diagram depicts the process, which is about how a hydroelectric

power

station produces electricity.

Overall

, there are distinctive stages of

this

process during the

day

and

night

. It starts with the

water

from the river, which is in a high-level

reservoir

. The

water

will eventually find its way and go to the

power

station to light up the national grid.

First,

the

water

from the river is reserved in a high-level

reservoir

.

Second,

we can see a dam which is opened during the

day

and closed at

night

. Throughout the

day

, after being flown, electricity is generated by

water

,

while

at

night

,

water

is flown through pumping.

Third,

the generator is operated by reversible turbines in the

power

station.

Finally

, the

power

produced by the generator will

power

the national grid through

power

lines. Throughout the

night

, after being pumped by reversible turbines, the

water

goes into a high-level

reservoir

,

while

during the

day

it goes into a low-level

reservoir

.