Submission of scientific papers to the Special Issue "The Future of Hydropower: Sustainable Goals, Planning, Practices and Technologies", for which I am Guest Editor, is now open. https://www.mdpi.com/journal/sustainability/special_issues/SustainableHydropower The scope of this Special Issue is to contribute to the understanding, development, and implementation of sustainable solutions to make hydropower more environmentally and economically attractive, both from a strategic point of view and from a technological one. Interesting topics are the rehabilitation of old plants, the optimization of hydraulic structures to increase their efficiency and eco-sustainability, fish protection by implementing fish friendly solutions (like fish friendly turbines and fish passages), the optimization of hydropower schemes to reduce environmental impacts, sustainable practices and strategic planning (both at the large and local scale) in light of the Water Framework Directive, and impact/environmental assessments of hydropower plants.