Sustainable energy sources like hydropower plants (HPPs) generate vast energy with minimal environmental impact. By utilising this clean energy solution, it is possible to effectively meet our energy demands without compromising the health of our environment. Unfortunately, HPPs can harm fish populations, migration routes and habitats. The EU-funded FIThydro project aims to evaluate HPPs’ impact on native environments in the EU. By collaborating with policymakers, the project seeks to develop a solution that addresses these concerns. The proposed solution involves using various tools, technologies and a decision support system. This approach enables HPP operators to maintain production rates while safeguarding fish populations and upholding environmental standards.