Overhaul maintenance stoppages for hydro-generating units must have their activities carefully planned to avoid delays in the execution schedule that affect power generation. However, usually postponements will happen. Such delays not only considerably jeopardize the maintenance overhaul schedule, but also lead to increased expenses due to Hydropower generation interruption, representing substantial monetary losses and even legal penalties for the generating power company. To reduce said losses caused by delays in overhauls, different scenarios of workforce teams are proposed for carrying out activities defined in the schedule. Each scenario presented associates a specific delay time with a respective cost. As a decision-making methodology regarding which scenario managers should choose to minimize losses the Max-min technique, belonging to Game Theory methodology, is proposed in this paper. A case study of an overhaul in a hydro-generating plant is presented as a way of validating the method, exemplifying how the financial losses due to delay were reduced as a result of the choice of the best scenario by the plant's operation and maintenance managers.