Energy grids is a multidisciplinary academic concept and research field focused on the analysis, design, operation, and evolution of large-scale, interconnected infrastructure networks responsible for the generation, transmission, distribution, and consumption of energy, predominantly electricity. This concept investigates the complex system dynamics, stability, reliability, security, and economic aspects of these networks, along with the integration of diverse energy sources and emerging technologies. Its significance lies in the fundamental role energy grids play as critical infrastructure supporting modern society, economic development, and the global transition towards sustainable energy systems.