We already have a lot of clean water reservoirs that we use for supplying our homes and water companies are looking at installing small turbines to take advantage of the potential energy. It could be to do with that.
Regardless, your comment is daft because in many ways dams are an extremely 'environmently and economically friendly way to generate electricity' minus the sarcasm.![]()
Retrofitting turbines into existing dams seems a good idea. It will be interesting to see if it's economically viable though.
Yes, dams are extremely environmentally and economically friendly, if you ignore the fact they are usually placed in environmentally sensitive, more natural areas, involve huge building works and habitat destruction, cause problems for both water migrating creatures (such as fish) and land migrating creatures, reduce flow of water downstream* and silt up after a few years, reducing their effectiveness. That's ignoring the human impacts, which include relocating potentially whole villages and going overbudget, almost bancrutping entire nations (or at the very least causing huge loans to be needed).
That's ignoring the methane problems from the rotting vegetation.
*Causing knock on effects for the environment downstream.
Other than that what have the romans ever done for ... sorry... what environmental impacts do dams cause?
Dams are way down the list of environmentally friendly electricity generating apparatus. Yes, many of those issues listed above are more related to megadams but even small dams tick most of those boxes (and more). They really aren't as environmetally friendly as most people think, especially larger dams.
We should be pushing ahead with things like wave, wind and solar energy before we start building more big dams and reservoirs.
Example articles
http://www.pri.org/stories/2014-09-10/how-clean-power-dams-actually-damage-environment
http://www.internationalrivers.org/environmental-impacts-of-dams