Hydro power is one of the worst "green" energy solutions. It fucks up the natural structure of the region irreversibly and also has a set timeframe to operate on in which after it becomes obselete.
Nuclear is clearly the best, but with so much misinformation about the technology it's a very hard sell to the public and an immense jumping point to any opposition parties in given country.
So that leaves wind and solar. While solar is more promising, because of the materials needed to produce the panels, it's not nearly as clean as wind.
So all in all I would've preferred heavy investment in wind farms instead of these huge dams.
Oh well, in the short to mid term these will actually help us out, so it's not all bad.