: of or relating to production of electricity by waterpower
constructed a hydroelectric power plant at the dam site

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The prime component of most hydroelectric systems is a dam. A high dam funnels water downward at high pressure to spin turbines, which in turn drive generators to produce high-voltage electricity. Mountainous countries with rushing rivers can produce the most hydroelectricity. Though hydroelectricity comes from a clean and completely renewable energy source, dams disrupt natural systems in a way that disturbs environmentalists.

Examples of hydroelectric in a Sentence

Recent Examples on the Web
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Meanwhile, rescue efforts have increasingly focused on tunnels at several hydroelectric projects where workers are believed to be trapped. ABC News, 3 Sep. 2026 Authorities said powerhouses of hydroelectric plants have spaces and rooms for people to stay and rescuers are trying to reach them and look for survivors, with at least 639 people still missing, including those believed to be trapped in tunnels. Reuters, NBC news, 2 Sep. 2026 Among them are hundreds of workers believed to be stuck inside large underground tunnels connected to hydroelectric power plants. Jackie Flynn Mogensen, Scientific American, 1 Sep. 2026 Officials are starting to streamline teams for specific response needs – including hundreds of people who may be trapped in labyrinthine hydroelectric power plant tunnels. Simone McCarthy, CNN Money, 31 Aug. 2026 See All Example Sentences for hydroelectric

Word History

Etymology

International Scientific Vocabulary

First Known Use

1884, in the meaning defined above

Time Traveler
The first known use of hydroelectric was in 1884

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Cite this Entry

“Hydroelectric.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydroelectric. Accessed 4 Sep. 2026.

Kids Definition

hydroelectric

adjective
: of or relating to production of electricity by waterpower
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