India’s ongoing energy transitions are a systemic response to addressing critical challenges associated with climate change. Importantly, it leverages decarbonization as a strategic pivot to simultaneously mitigate and adapt to climate risks. The decarbonization agenda is largely skewed towards mitigation, struggling with adaptation alignments. Energy justice is a core dimension of adaptation intervention and it is important to explore how energy justice is or can be conceptualized and delivered as the decarbonization agenda is underway. Existing research suggests that, in the cities of the Global South, active involvement of intermediaries becomes a pivotal anchor and pathway to access infrastructure services, especially in low-income and informal settlements. Importantly, advocacy efforts by intermediaries also tackle existing injustices that restrict these settlements from accessing essential infrastructure services. Intermediaries become especially important in cities like Mumbai, where 41% of the people live in informal settlements (slums). Using Mumbai as a case study, this paper explores two questions in the context of intermediaries, energy access, and energy justice. First, how do intermediaries engage with infrastructure and governance structures to enable access to electricity in informal settlements? Second, does this ‘intermediation’ deliver just outcomes? Empirical fieldwork reveals that intermediaries serve as a quasi-political counterbalance by engaging in ‘politics from the bottom’ to articulate justice concerns, mobilize stakeholders, and produce knowledge that feeds back into the intermediation process. We argue that this is important if we need to ensure that energy transitions do not create systemic inequities and that the benefits of the ongoing transition are widespread and just.