Fund manager bets on new source of renewable power: old river dams
Dams built long ago to control floods or ease river transport are gaining attention as a potential zero-carbon electricity source in the US, as environmentalists and the hydropower industry drop their longstanding antagonism in the face of climate change. Hydroelectricity is like wind, solar and nuclear power in that it emits no planet-warming carbon dioxide, yet hydro capacity has not grown for decades after big dams became impossible to build.