The (un)affordability, the (un)reliability and the (un)sustainability of our energy supply are increasingly associated with the phenomenon of energy justice. This concerns the way in which different groups of citizens and businesses experience the benefits and burdens of the energy transition. We explore how the concept of energy justice may support a just transition. Firstly, we address the socio-political embedding of the energy sector and policy-making. Then we explain how the concept of energy justice is defined and operationalized, in respect of policy making and implementation. Thereupon we apply the concept of energy justice to the current Dutch energy debate, addressing the reduction of natural gas production to diminish the number and strength of earthquakes in Groningen, and the longer-term policy objectives of the energy transition. It addresses the radical changes in energy use and supply and the consequent wide variety in direct and indirect consequences for citizens and businesses, depending on their specific circumstances. The notion of energy justice is discussed as a feature in local, national and EU policy making and implementation, and as a claim of social actors, communities and individuals. The suggestion that justice issues can be identified and solved at these levels, is too simple. It is important to consider the layout and nature of the socio-technical energy system and its functioning. It is concluded that the concept of justice may help researchers to identify the relevant values and value conflicts in the energy transition. This can help policymakers to make informed choices.