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 how a hydroelectric

power

station

operates to produce

electricity

.

Overall

, a hydroelectric

power

station

has two different modes of operating during day time and

night time

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nighttime

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. To make

electricity

,

water

flows from the river to the

generator

and the generated

electricity

is

then

conducted to the national grid. During the day time,

water

from rivers goes into a high-level

reservoir

. By the

reservoir

, there is a dam, which is open to allow

water

from the

reservoir

to run through a pathway.

This

pathway leads the

water

to the

power

station

. Here, reversible turbines are used to make the

generator

functional.

Electricity

generated by the

generator

is transmitted through

power

lines and

then

distributed to the national grid for use. Meanwhile, after passing the turbines,

water

continues to flow into a low-level

reservoir

. The

power

station

also

works at night but in

a

Correct article usage

apply

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reverse mode.

Instead

of operating the

generator

, the turbines pump

water

from the low-level

reservoir

in the opposite direction as it goes during the day, which means that

water

moves towards the high-level

reservoir

during the night.