Doubling HydroPower

Me, "Back in 2009...."

From article, "This is Big: U.S. Could Double Hydropower Capacity With Minimal Impact, Says Steven Chu
(U.S. Energy Secretary Steven Chu said that hydropower capacity in the United States could "double with minimal impact to the environment", mostly just by installing more efficient turbines at existing hydroelectric projects or at dams without power components, increasing the use of pumped-storage projects, and encouraging the use of run-of-the-river turbines. These kind of improvements to the existing infrastructure could apparently add 70,000 MW of capacity. "We will be pushing this," Chu said at a White House forum. "We're not talking about a lot of large, new reservoirs. Just work with what we have and it's a massive amount of power.")