works http://energy.gov/eere/water/hydropower-basics. hydroelectric U.S. Department of Energy Hydropower Hydropower Basics Hydropower Basics Hydropower Basics Hydropower Basics all but two U.S. states Hydropower Basics Hydropower Hydropower Basics http://energy.gov/eere/water/hydropower-basics. http://energy.gov/eere/water/hydropower-basics. Hydropower Basics hydropower basics http://energy.gov/eere/water/hydropower-basics. hydroelectric all but two U.S. states http://energy.gov/eere/water/hydropower-basics. Hydropower Basics http://energy.gov/eere/water/hydropower-basics.