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.
Hoover Dam
Niagara Falls
You are correct it is a generic term
https://m.stacker.news/42731
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