Victoria, Australia has experienced multiple large-scale power outages due to heatwaves, which are expected to intensify with future climate change, posing a risk to the security of the state’s electricity system. This talk will examine the impacts of extreme temperatures on transmission, distribution, generation and whole-system dynamics. It will present findings from a probabilistic assessment of system and component-level risks under current climate conditions compared with a projected 2°C future scenario. The talk will also discuss the limitations of current policies and how incorporating climate-informed planning can help address the energy trilemma – ensuring net-zero investment is cost-efficient and future-proof.