Electrical grids consist of power stations, electrical substations to step voltage up or down, electric power transmission to carry power over long distances, and finally electric power distribution to customers. In that last step, voltage is stepped down again to. An electrical grid (or electricity network) is an interconnected network for electricity delivery from producers to consumers. It includes power plants, high-voltage transmission lines, substations, local distribution wires, transformers, meters, and the control. The electricity supply chain consists of three primary segments: generation, where electricity is produced; transmission, which moves power over long distances via high-voltage power lines; and distribution, which moves power over shorter distances to end users (homes, businesses, industrial sites. Real-Time Balancing Act: The power grid operates as the world's largest machine, requiring precise matching of electricity supply and demand every second of every day, since electricity cannot be stored economically at scale. High-Voltage Efficiency: Transmission lines use extremely high voltages. NERC oversees reliability and security for a bulk power system (BPS) that serves approximately 400 million people and has some 526,833 circuit miles (847,856 circuit kilometers) of transmission greater than 100 kilovolts. The diagram below depicts the basic elements of the electric system: how.