Last week, the Department of Energy, under President Obama, released a plan to expand hydropower by 50%, from about 100 GW to 150 GW by 2050, through electrifying existing dams and emplacing pumped hydro storage at existing non-powered dams to facilitate more intermittent renewables like wind and solar onto the electric grid. But the biggest hurdle facing hydropower is the complicated and capricious regulatory and licensing processes. Just as with nuclear, this uncertainty increases costs and can even kill projects halfway through the process, making them unattractive to investors.

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