Space weather events due to solar flares and CMEs release radiation, high-energy particles that disturb Earth’s magnetosphere and drive geomagnetic storms. These storms induce ground currents that threaten power grids, with past events causing blackouts in Québec (1989), transformer damage in New Zealand (2021), and tripping in Sweden (2023). Europe’s interconnected grids are particularly vulnerable. Beyond power systems, space weather also affects satellites, navigation, aviation, and human spaceflight. (Credit: ESA/Science Office).