The Russian invasion of Ukraine marked a turning point in Europe’s energy and climate security, exposing deep structural vulnerabilities in the EU’s energy systems. This report introduces the updated Energy and Climate Security Risk Index, which is a comprehensive, data-driven tool designed to assess systemic risks across all EU member states. The Index evaluates energy security through four interconnected dimensions: geopolitical risk, affordability, reliability, and sustainability. It reveals a growing divide between transition leaders and vulnerable laggards, underlining the need for differentiated yet coordinated policy responses across Europe.