Decarbonizing the energy system is one of the most challenging sustainability transitions that leaders across the globe must tackle. In governing this transition, decision-makers are increasingly pairing together decarbonization efforts with policy measures focused on issues of (in)justice. However, researchers’ understanding of the politics that have given rise to this emerging equitable energy transition agenda is under-developed. The central research question of my dissertation is: How is the energy transition made more attentive to equity through stakeholder advocacy? I examine this using qualitative methods across three analytical chapters. The study of justice in energy transitions has occurred across different lineages of scholarship. To establish a clearer understanding of the state of current research I conducted a systematic literature review. In the literature, I found a diverse advocacy community motivated by many different issues related to the energy system. Advocacy concerning inaccessible decision-making processes, environmental degradation, and energy ownership and control was common. However, there were few studies that explicitly focused on examining the relationship between advocate strategies and governance outcomes. The remainder of the research presented in this dissertation analyzes two state-level policy processes in New Mexico and Illinois. In both cases, justice-oriented policy instruments were bundled with climate policy. First, using public documents and interviews, I used process tracing to examine policy development and enactment. I find that different types of learning processes were critical in shaping justice policy provisions and that justice advocacy was instrumental in passing climate policy. Second, I used content analysis to examine the mechanisms within these processes driving and resolving justice conflicts. My findings show that disagreements about justice are rooted in divergent historic experiences of energy production and regulation. I also find that issues of (dis)trust and uncertainty contributed to disagreements and reinforced conflicts that diminished support for energy transition policy. This dissertation provides empirical evidence of the importance of learning for shaping justice policy provisions and building energy transition coalition power, the nature of uncertainty and (dis)trust in destabilizing justice efforts and reducing support for climate policy, and the ways in which incremental change may lead to transformative outcomes.