International mobility enriches both, educational institutions and students that enjoy it. In this paper, the process of getting an Erasmus+ traineeship AQ1 and the benefits derived from it are presented. This work shares the experience of a group of French students who have enjoyed an internship at a Spanish university in 2021. The importance of preparing the stay and the procedure to be carried out from both educational institutions, the one of origin and the receiving, is shown. For the successful of this mobility, it is also key to define a project that motivates the students and suits their background and skills. In this case, a project focused on renewable energies has been proposed. It consists on the design of a floating wind turbine prototype. Clean energy has proven to be very attractive to students and it is a way to discover new vocations for young researchers.