The Baltic Sea Region is a European energy frontier. In this geographical area, renewable energy is replacing fossil fuel faster than elsewhere in Europe. The innovation potential of the Baltic Sea countries is an important prerequisite for these developments. Yet, as a consequence of the war in Ukraine, this region is currently also witnessing increasing geopolitical tension. The potential of renewables to improve energy security may result in new opportunities for the energy transition. At the same time, geopolitical conflicts may increase concerns about security and sovereignty. The deployment of new energy technologies may therefore face new security requirements in order to move forward. To provide a better understanding of how geopolitics is shaping the energy transition in the Baltic Sea Region, this chapter explores the trade-offs among energy innovation, security, and sovereignty. Based on the Impossible Energy Trinity, we ask whether energy innovations have security implications that are likely to hinder progress towards a higher level of sustainability in the Baltic Sea Region. We conclude with an outlook on the prerequisites for a successful energy transition in the Baltic Sea Region.