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That sounds more like a generic term.
Hydro electricity could be obtain from a water turbine, tidal stream systems, etc..
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Hoover Dam
Niagara Falls
You are correct it is a generic term
Edit:
In 1870 watermills still produced 2/3 of the power available for British grain milling.[62] By the early 20th century, availability of cheap electrical energy made the watermill obsolete in developed countries although some smaller rural mills continued to operate commercially later throughout the century.
https://en.m.wikipedia.org/w/index.php?title=Water_wheel&wprov=rarw1
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hydro-electric