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From Longman Dictionary of Contemporary English
Related topics: Electricity
hydroelectrichy‧dro‧e‧lec‧tric /ˌhaɪdrəʊ-ɪˈlektrɪk◂ $ -droʊ-/ adjective  TPEusing water power to produce electricity a huge hydroelectric power stationhydroelectricity /ˌhaɪdrəʊɪlekˈtrɪsəti $ -droʊ-/ noun [uncountable]
Examples from the Corpus
hydroelectricThe only other significant source of power today is hydroelectric.Reservoirs, rivers and snowpack are too low to power hydroelectric dams without further imperiling endangered salmon runs.The advantage of hydroelectric generators is that they can be switched on and of easily, according to demand.a hydroelectric power plantIt also welcomed the realization of the joint hydroelectric power station project Ruzizi-II, and progress on co-operation in scientific research.By 1942, however, we possessed something no other country did: a huge surplus of hydroelectric power.The money went largely to a sewer project in Lima and to rural road and hydroelectric projects.Environmental protests against the hydroelectric scheme had continued throughout the negotiations.Enquiries regarding sites for hydroelectric schemes and numerous small matters related to the war effort were also dealt with.
From Longman Business Dictionaryhydroelectrichy‧dro‧e‧lec‧tric /ˌhaɪdrəʊ-ɪˈlektrɪk◂-droʊ-/ adjective involving the use of water power to produce electricityThe dams produce most of the country’s hydroelectric power.hydroelectricity noun [uncountable]Oil was abandoned in favour of hydroelectricity and nuclear power.
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