This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Generating electricity by conversion of the energy of running water.

adj. Of, relating to, or using electricity so generated.

adj. that generates electricity by converting the energy of moving water

adj. of or relating to the electricity so produced

hydro-electric bath    hydroelectric machine   

flood-control    solid-waste    astroengineering    hoover    desalination