How to obtain energy

Two procedures are available to obtain energy from fresh water: water wheels and hydroelectric power plants. The former produce mechanic energy, the latter electricity. Water is a source of energy marked by numerous advantages known by mankind. That is why it has been used for 4,000 years. It is a relatively abundant source, more or less free, renewable and environmentally friendly. Moreover, its efficiency in the production of electric energy can exceed 80%.
Energy can be obtained from seawater too, by exploiting its movements (waves, tides and currents) and its thermal energy (water heating) by creating artificial basins and equipment exploiting temperature difference. However, such technologies still need further development and sometimes only lead to experimental applications.

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From the Multimedia section

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    Percentage of energy from hydroelectric in 2016

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    Hydroelectric production in Italy

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    Number of hydroelectric plants in Italy

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    Waterfall

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    Penstock

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    Dam on the Colorado River

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    Dam on the Sacramento River

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    Watermill

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    Share of renewable electricity sources in total electricity sector consumption (2018)

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    Percentage of energy from hydroelectric in 2016

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    energy

    Hydroelectric production in Italy

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  • energy

    Number of hydroelectric plants in Italy

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    energy

    Waterfall

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  • energy

    Penstock

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    energy

    Dam on the Colorado River

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  • energy

    Percentage of energy from hydroelectric in 2016

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  • energy

    Hydroelectric production in Italy

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  • energy

    Number of hydroelectric plants in Italy

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Facts