Hydropower is the world’s largest source of renewable electricity today, according to the International Energy Agency. Like gas peaker plants, it’s highly dispatchable, meaning it can complement intermittent renewables like wind and solar.
And we could get a lot more of it. The IEA estimates that we could double the amount of hydro-generated energy produced globally. One peer-reviewed study found that global economic potential for hydropower was 21,000 terawatt hours, more than five times the current generation today.
https://www.canarymedia.com/podcasts/catalyst-with-shayle-kann/how-to-build-more-hydropower
A recent study published in Transactions of the American Fisheries Society shows 100% safe passage of the endangered American Eel through Natel's Restoration Hydro Turbine.