Energy Secretary. US could double hydropower with minimal changes

More efficient (and fish-friendly) turbines, increased pumped storage, better intakes and other refinements means much more power can be generated from existing hydro installations, all of it virtually carbon free.

Plus, we’re barely using what we have.

Hydropower accounts for 6 percent of the U.S.’s electricity consumption and nearly 75 percent of renewable power, according to the Energy Information Administration, the statistical arm of the U.S. Department of Energy. But just 3 percent of the U.S.’s more than 82,000 hydroelectric projects generate electricity.