This thesis investigates how smart energy experimentation arranges environmental governance in Sweden, focusing on the politics of such processes, against the background of an escalating environmental and climate crisis that necessitates urgent energy transformation. Empirically the thesis includes case studies of pilot projects in Stockholm, Malmö, Västerås, and on Gotland, and analysis of the policy landscape, mainly through text analysis and interviews. Theoretically the study takes a critical approach based on a Foucauldian understanding of governance. Concepts are derived from "governmentality studies" and science and technology studies. This approach aims to unpack experimentation as governance arrangement through asking questions about how governance is arranged beyond singular experiments, such as ideas and practices of achieving broader change beyond isolated experiments.