Abstract The technical and geographical characteristics of fossil fuels have shaped interstate energy relations for decades. The ongoing energy transition leads to an increasing share of renewables in the electricity mix. Since technical and geographical characteristics of renewables differ significantly from those of fossil fuels, it is likely that renewables affect energy relations between countries in a different way. It is yet unknown how these deviating characteristics will exactly influence the international energy relations, and evidence from concrete cases is missing. This study therefore examines the geopolitical implications of wind power in the Danish electricity system. The aim is to assess how interstate energy relations shifted between 1990 and 2018, and whether these shifts can be attributed to the technical and geographical characteristics of wind power. A framework of analysis is constructed to outline the geopolitical implications in 1990 and 2018. Desk research and expert interviews are used to obtain the data. The research concludes that the implications of the transition have been rather positive for Denmark. While sometimes depending on its neighbours for electricity supply, Denmark is still able to safeguard energy security, generate revenues and gain global political influence by sharing knowledge. Further research should outline the implications for other types of renewable energy sources and focus on the geopolitical implications of wind power in other regions.