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 figure provides an overview of the process of generating electricity in a hydroelectric energic station. In the daytime, electricity is generated by the river from the high-level reservoir with a huge dam that prevents the stored water

flowing

Change preposition

from flowing

show examples

out. At

this

moment, the intake system is open before the sky turns dark.

Then

, the generator at the power station is operated by reversible turbines in order to change lines to the national grid. When it comes to the nighttime, the energy stems from the low-level reservoir. At the next stage, the turbines reverse river to the generator again,

then

pumps it into the higher area, which in the pipe flowed of water.

On the other hand

, the intake operator is closed at night, which is different from the daytime.

To sum up

, it is evident that the electricity generated by the river from day to night in four main stages,

such

as storing water, operating the power station, and pumping back to the dam.