Hydropower plants are vital for renewable energy production. However, traditional systems can suffer from turbine fatigue and limited operational flexibility. Additionally, fish passage issues pose challenges for biodiversity and ecosystem health. As the demand for sustainable energy rises, enhancing hydropower’s viability becomes increasingly urgent. In this context, the EU-funded RevHydro project will address these challenges through the design and validation of innovative flow control devices. These devices, installed in the runner and draft tube, extend turbine operating ranges, reduce fatigue, and improve overall efficacy with minimal downtime during refurbishment. RevHydro also features an adaptive fish barrier that redirects fish to safe passages, contributing to environmental conservation.