Hydropower plants are crucial to society. Maintenance becomes vital for the prevention of unforeseen stoppages and a complete breakdown of the machine in a hydropower plant. The deterioration of these assets and the optimal allocation of a limited budget for their maintenance correspond to crucial challenges for hydropower plant utility managers. Decision makers should be assisted with optimal solutions to select the best maintenance. We assess the most popular maintenance approaches, utilizing the Multiple Criteria Decision Making (MCDM) evaluation methodology. Analytic hierarchy process (AHP), an effective method that can solve a multiple criteria decision making problem, was applied to the problem of hydropower plants’ maintenance to gain a scientific and objective view on maintenance scheduling.