The decision-making process for the modernization of hydraulic power plant involves to overcome huge number of possible renovation options at early design stages, when each decision has a major impact on the final performance of the hydropower plant. The RENOVHydro project rely on a systematic assessment of renovation options, considering hydraulic structure, hydro units and hydropower station interaction with the grid for the provision of ancillary services. This high level of support for the decision-making process drastically reduces the risks of selecting under-optimal solution.