This article explores how discourses may influence the potential for success in mitigating climate change in Swedish municipalities. We identify dominant discourses in climate change mitigation policy in three Swedish municipalities using argumentative discourse analysis, based on policy documents and interviews as empirical material. Political leadership and adequate organizational preconditions are necessary for working with climate change mitigation in municipalities, but the role of discourse is also significant. Policy discourse constructs preconditions for certain scenarios while rendering others less likely. Previous studies have shown that the ecological modernization (EM) discourse tends to be dominant, something which this study confirms and investigates further. We find that the dominant discourse is strong EM, which largely considers it possible to decouple economic growth and environmental problems through renewable energy and technology. A focus on collaboration between stakeholders is central and a global climate justice perspective is present to some extent. Potential solutions that are not related to the market or technological innovation risk being rendered invisible when this discourse is dominant, but the inclusion of a diversity of actors and an increased focus on climate justice could potentially minimize this risk. Finally, emerging discourses around transformation and circular economy have potential to enable the forging of new paths. This depends, however, on how these concepts are framed and how they are used.