The RevHydro project aims to enhance the efficiency, flexibility, and sustainability of existing hydropower plants through the design and validation of flow control devices. Specifically, the proposed flow control devices, located in the runner and draft tube, extend the operating range of turbines, reduce fatigue, and enhance overall efficacy. Notably, their installation will require minimal downtime, resulting in significantly improved refurbishment processes. Additionally, the project incorporates an innovative fish barrier and a circular design approach. The innovative fish barrier included in the project adapt to the incoming fish, allowing to redirect fishes to safe passages, contributing to environmental conservation efforts. Furthermore, the circular design approach adopted in the project allow at minimizing costs and environmental impact. This holistic approach ensures compliance with water quality standards and supports biodiversity conservation.