There are legitimate disadvantages to hydro-electric power.
The biggest problem is environmental.
While the building of dams create many recreation opportunities, it has an adverse affect on wildlife in that area.
Fish have difficulty swimming past these dams. Even with the use of newer technology, it is definitely not ideal for fish. Fish are a vital natural resource.
Hydropower can also impact riverbank(riparian) habitats. Whatever energy source we use, we must ensure that we keep the environmental impact to a minimum.
