The main goal of this paper is to explore -using a system dynamics model of the EU-25 electricity generation sector- the transition of the EU-25 electricity generation system towards a more sustainable system characterised by much lower CO2 emissions. The system dynamics model and the resulting dynamics are explored by means of base case simulations, policy simulations, scenario analyses and (univariate and multivariate) sensitivity analyses. Finally, some conclusions, ex-post criticisms and directions for future research are discussed.