Grid Security Vector Diagnostic is a methodology used to assess and analyse potential vulnerabilities and risks in the security of an energy grid system. It involves identifying various vectors or avenues through which threats can potentially exploit weaknesses in the grid's infrastructure, operations, or cybersecurity measures. The diagnostic process aims to evaluate the resilience and preparedness of the grid system against potential security threats, both physical and digital, and develop strategies to mitigate these risks. The Grid Security Vector Diagnostic is a comprehensive approach that helps grid operators and security professionals identify vulnerabilities, understand potential threats, and implement proactive measures to enhance the security and resilience of the energy grid system. By addressing security risks, it helps safeguard critical infrastructure and ensures the reliable delivery of electricity to end-users while mitigating the potential for disruptions or malicious activities.