The sEEnergies project is based on the concept of Energy Efficiency First Principle and is aimed at the identification of energy efficiency potentials on which the future European energy system should be designed. In two earlier deliverables (D2.1 and D2.3), the energy savings of the Energy-efficiency scenario compared to a business-as-usual trajectory have been assessed. The present deliverable, D2.4, discusses additional environmental and social impacts of the measures included in the Energy-efficiency scenario. For each impact category, the causal mechanisms producing the impact are briefly described. For some of the impacts, quantitative assessments of the impacts compared to a business-as-usual trajectory have also been made. However, for most impact categories, only qualitative descriptions have been possible.