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 the process of generating electricity in a hydroelectric

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station that has two stages which are during the day and during night time.

First,

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during the day,

water

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is taken from the river as the dam, which is located at a high-level

reservoir

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, is being opened.

Then

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,

water

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will immediately flow to the

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station where the reversible turbines are operating the generator.

Next,

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the generator will change

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lines into the national grid in order to generate electricity. During nighttime, a low-level

reservoir

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will enter the reversible turbines, where it pumps

water

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back up. It will instantly flow to the high-level

reservoir

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, and the cycle continues.

To sum up

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, in order to generate electricity, a hydroelectric

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station needs to do several steps during the day and night. It requires opening and closing the dam

,

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and pumping

water

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from high to low-level

reservoir

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and low to high-level by turbines.

Moreover

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, it requires a connector for the

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lines to the national grid with the help of the generator.