This study examines the transition to a sustainable energy system in Swedish society, by analysing research, policy and strategies related to the energy sector. The study applies an institutional approach informed by evolutionary governance theory as well as energy smart and communicative planning theory to analyse how the transition is portrayed on a Nordic, National and regional level. As the purpose is to understand the decision-making process behind the transition, the research design is qualitative and uses official and private documents as the main source of data. To analyse the material, the study applies a method developed by Healey (1993) and Khakee (2000) as a model to read texts as the product of a broad discourse. The results show that the transition towards a sustainable energy system is driven by institutional governance informed by increased European intervention. The Nordic countries, especially Sweden, have during the past decade established structures to become 100 per cent decarbonised and reliant on energy generated from renewable energy sources. Although the core ideology behind the transition is positive from a sustainable perspective, there are many technical challenges on a domestic and regional level that have not yet been solved.