Steering Electricity: How Grid Control Devices Unlock Transmission Capacity - CleanTechnica

The article from CleanTechnica discusses the critical role of grid-enhancing technologies, particularly Flexible AC Transmission Systems (FACTS) and Advanced Power Flow Control devices, in optimizing existing electricity transmission infrastructure. As electrification increases demand and renewable generation shifts geographically—often far from urban centers—the expansion of new transmission lines has slowed due to lengthy permitting and environmental review processes. Consequently, transmission capacity, rather than generation capacity, has become a key bottleneck in many regions. These technologies enable grid operators to more effectively manage power flows on existing lines, overcoming the physical and regulatory challenges of building new corridors. A fundamental limitation in alternating current (AC) transmission networks is that electricity flows according to the impedance of lines rather than operator commands, causing uneven distribution of power that can overload certain lines while others remain underutilized. FACTS devices, which emerged commercially in the late 20th century, use power electronics to control voltage, reactive power, and line impedance, allowing operators to steer electricity flows more precisely. This