The role of urban regions in action on reducing greenhouse gas emissions has become increasingly central to global urban governance over the past 20 years and particularly after new promises and agreements made at COP21. Despite some attention across urban studies, the need to interrogate how new forms of urban carbon governance are transforming infrastructure space remains pressing. This paper examines the low-carbon restructuring of the waste system in Mbale, Uganda, a town struggling to address its socio-ecological futures. The paper asserts that a UPE approach to how urban carbon governance is materialised advances three particular concerns; the governing of urban circulation, carbon capital and socio-material relations. Through examining these, the paper shows how global actors are increasingly involved in low-carbon transformation, use places such as Mbale as spaces of experimentation and dominate the governing of this restructuring. Yet out of such unjust processes new forms of contestation and low-carbon politics may emerge.