Scholarship on socio-technical transitions has theorized pathways for a transition toward sustainable energy systems. This research undertakes a discourse analysis to understand different visions for sustainable energy transitions in Canada. More specifically, it assesses discourses used by environmental groups and Indigenous communities across Canada to communicate the essentiality of energy transitions. I observe that environmental groups emphasize sustainable energy as an economic growth opportunity. In contrast, Indigenous communities place greatest emphasis on sustainable energy as a means for exerting sovereignty. In Canada, the environmental movement has frequently conflicted with Indigenous self-determination movements. Though tensions persist, contemporary energy and climate politics have allowed these two spheres to establish a new relationship of reconciliation and solidarity. I conclude that both environmental and Indigenous advocates for sustainability transitions have influence on the socio-technical regime, and that an improved relationship between these spheres would improve the potential for an energy system transition in Canada.