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 picture illustrates the process of generating electricity from a hydroelectric

power

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station. In general, two different sources of reservoirs supply

water

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to the generator at the

power

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station, resulting in electricity distributed to the national grid. Here is a

further

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explanation.

To begin

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with, from the left side,

water

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from a river comes to a high-level reservoir with a dam

that is

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open during the day and closed at night. From

this

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site, the

water

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flows to generate electricity and comes to the powerhouse, where the generator is turned by it, and

power

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lines are distributed to the national grid.

This

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system process is

also

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implemented at a low-level reservoir that we can look at from the right side of the picture. The difference between both is just the

water

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source. On the other side, reversible turbines in the

power

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station operate the generator during the day only,

while

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at night it pumps

water

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from the low level of a reservoir into the high level.