Energy justice framework contributes to the discourse of sustainable energy systems’ development by addressing important aspects of the long-term social sustainability of energy systems. There are examples of applying energy justice framework on different scales – from local to global. However, understanding of what energy justice is and how its aspects relate to each other remains fragmented. This paper aims at contributing to development of energy justice framework by using modelling and simulation techniques. It presents a system-dynamics-based simulation tool which models global energy system in a highly aggregated and simplified way, being grounded on the theoretical assumptions of energy justice framework. The model portrays both physical and actors’ structure of global energy system and aims at providing a systemic perspective of how different pillars of energy justice are interrelated. The focus is on exploring energy system development dynamics in the global North and the global South while aiming at reaching global energy system’s goal of providing sufficient amount of biophysically and socially sustainable energy for all.