This article investigates the deregulation of the Swedish electricity industry as a political process. Discussions about deregulation started in the late 1980s. A first step in the process was the corporatization of the Swedish state-owned utility Vattenfall in 1992. The deregulatory process culminated with the new Electricity Law, which entered into force in 1996. We investigate in historical depth how a diverse range of actors contributed to shaping both the new institutional environment and the political discourse. The article scrutinizes not only the formal political decision-making process and the activities of a variety of ministries, boards and agencies, but also the processes by which energy companies and other relevant industrial actors influenced the outcome of the regulatory reforms. We explicitly focus on activities taking place on both political and business arenas, showing that major stakeholders acted on several arenas simultaneously to influence the deregulatory process and that the large power companies were most skilful in doing so. We also show that activities on the political and business arenas mutually reinforced each other in shaping the new regulatory framework. (C) 2009 Elsevier Ltd. All rights reserved.