Abstract Background Article 12 of the Paris Agreement summons the signing parties to corporate in improving the education of their citizens on climate change and related matters. The article thereby acknowledges the importance of citizens support and understanding of climate change and needed measures to fight climate change. This paper aims to contribute to the goal of informing on the implications of climate change related policy on the power sector in Europe and hence all European citizens by presenting a serious game in which the player can explore how key policy decisions affect capacity mix, investment needs and electricity costs.Results The game is based on more than 1700 scenarios run through an open-source and accessible, yet technologically detailed myopic energy system optimisation model for the electricity supply in the EU27 + 3. The game allows the user to take the role of a decision maker and make decisions in 2020, 2030 and 2040 regarding the usage of CCS, biomass imports, cross-border electricity transmission and the pace of emission reductions. The user is then presented with economic, social, and environmental impacts of these choices. These impacts are for example measured and illustrated in the development of CO2 emissions per capita, levelised cost of electricity, and investment need per citizen.Conclusion The Power Decisions Game provides a first of its kind open-source infrastructure that allows non-modellers to explore the impact of key decisions and preferences on the design of the future European power system. It furthermore, provides insights on the consequences of short-sighted decision making. The game can be used to facilitate policy-science discussions.