HVDC (high-voltage direct current)

Grids run on alternating current, but for very long or undersea links, direct current can carry bulk power with lower losses. Converter stations at each end switch between AC and DC.

In Korea, phase one of the East Coast–Singapyeong HVDC line, which will carry power from east-coast plants to the capital region, is due for completion in the first half of 2027. The government says it will lift the east coast's grid-managed substation designation then.