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 shows the

process

of generating

electricity

in a hydroelectric power station by using natural

water

energy

.

Overall

, the whole

process

consists of four different stages and it begins with storing

water

from the river in a

reservoir

and culminates with delivering the

electricity

to the national grid.

This

process

uses two types of intake conditions, which are

opened

Replace the word

open

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in

Change preposition

during

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the day and closed

in

Change preposition

at

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the

Correct article usage

apply

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night and

requires

Correct subject-verb agreement

require

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a number of specific pieces of equipment, including the

reservoir

, the dam, the pump, the

turbines

, and the generator.

First,

the

process

begins when the

water

from the river, having the potential

energy

, is stored in a high-level

reservoir

. After that, the opened intake allows the

water

to flow down through a pipe into the

turbines

inside the power station during the day, which converts potential

energy

to kinetic

energy

. In the following stage, the

water

rotates the

turbines

, so that the

turbines

operate and produce

the

Correct article usage

apply

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mechanical

energy

. At the same time, the used

water

flows into the low-level

reservoir

. After that, the generator generates

electricity

from

the

Correct article usage

apply

show examples

mechanical

energy

.

Finally

, the generated

electricity

is distributed to the national grid using power lines.

On the other hand

, in night conditions, the

water

from a low-level

reservoir

is pumped into a high-level

reservoir

when the intake is closed.