The standard term is “renewable”, and yes, there are environmental concerns for any type of human-engineered energy production. For run-of-river hydro power, o

The standard term is “renewable”, and yes, there are environmental concerns for any type of human-engineered energy production. For run-of-river hydro power, one mitigation is fish ladders: https://en.wikipedia.org/wiki/Fish_ladder https://en.wikipedia.org/wiki/Fish_ladder