This report proposes the use of a legitimization function of the Technological Innovation System (TIS), as an analytical framework to develop a roadmap and action plan for deploying cross-border renewable projects in Europe. This approach assesses the role, competences and critical issues of a subset of the key stakeholders. Based on this information, a set of actions are proposed as to achieve the social acceptance towards cross-border renewable projects in Europe. To conclude, a solar project in Extremadura is studied in order to validate this approach.