The emergent nature of the climate crisis, and the central role that the energy transition plays in mitigating and adapting to it, gives rise to broad, human-centric questions of justice. The aim of this paper is to explore the ways that a justice perspective can re-balance the energy policy trilemma faced in the European Union and to illustrate this using the example of solar energy and its potential to enhance energy (in)justices in the Bloc. My hypothesis is that a justice perspective with a focus on energy poverty and sustainability can re-balance the current wide gap in the energy trilemma facing the European policy objectives. Despite the assumption that low carbon energy systems may lead to greater energy justice, as illustrated through the example of solar energy, this may not be true. I conclude that while there is some potential in energy justice re-balancing the energy trilemma in the EU, several ‘invisible’ injustices are arising in the energy transition. The paper is separated in 5 chapters: 1) introduction; 2) a review of the energy justice literature and the establishment of an analytical framework in relation to energy poverty in the EU; 3) EU policies from a justice perspective and the energy trilemma; 4) the EU energy mix and the case-study of solar energy and (in)justices; and finally, 5) concluding remarks and recommendations.