Explore advanced techniques for identifying vulnerabilities in power grid systems through a comprehensive 46-minute conference talk from Derbycon 2018. Learn about public information sources, misconfigured websites, safety information systems, and open-source mapping tools that can be leveraged to uncover potential security weaknesses. Delve into topics such as Modbus Ethernet IP, smart meter technologies, and responsible disclosure practices. Gain insights into the critical role of cybersecurity in protecting essential infrastructure and discover practical steps for enhancing grid security. Conclude with a discussion on the broader implications of these findings and potential solutions for strengthening power grid defenses.