In 2021, hydropower contributed 16% to total global electricity production, whereas in the United States it accounted for only about 6% of the total (although it was responsible for 31.5% of electricity generated domestically from renewable sources), according to the U.S. Energy Information Administration. That small share of U.S. production could be higher: The 2016 Hydropower Vision Report, published by the U.S. Department of Energy’s (DOE) Water Power Technologies Office (WPTO), stated that “U.S. hydropower could grow from 101 gigawatts (GW) of capacity to nearly 150 GW by 2050.”