Lea-Rachel Kosnick

Build new, low-impact hydropower facilities but keep the old: Large dams already in existence can be improved.

Hydropower will never be the complete answer to emissions-free energy production in the U.S., but a strong case can be made for it becoming a useful part of the answer.

Looking at the untapped potential for hydropower to supply the U.S. with carbon-free electricity, Lea-Rachel Kosnik finds ample opportunities for expanding hydro.