A growing body of literature has emerged that examines cities as key sites for socio-technical experimentation with a variety of initiatives and interventions to reduce carbon emissions, upgrade ageing infrastructure networks and stimulate economic development. Yet while there has been a wide survey of global initiatives and attempts to explain the wider processes driving such experimentation (Bulkeley and Castán Broto, 2013) there remains a lack of empirical case study analysis to bring the concepts into context. In this paper we use the concept of urban experimentation as a lens to discuss the political and social ramifications of one such intervention in a city’s energy infrastructure network, with an examination of the Pecan Street smar...