An interconnector (also known as a DC tie in the USA) is a structure which enables high-voltage DC electricity to flow between electrical grids, connecting separate AC networks, or linking synchronous grids. It may be formed of submarine power cables, underground power cables or overhead power lines.
The longest interconnection as of July 2022 was the 2,210 km (1,370 mi) Hami - Zhengzhou delivering 8 GW of high voltage direct current power. The longest proposed connector is the 3,800 km (2,400 mi), 3.6 GW Xlinks Morocco-UK Power Project.