The Kii Channel HVDC system in Japan is, as of 2010, the highest-capacity high-voltage direct current (HVDC) submarine power cable system in the world. The Kii Channel HVDC system connects the Anan static inverter plant, located south of Tachibana Power Plant, at on the Japanese Home Island of Shikoku, with the inverter plant at Kihoku ( coordinates: ) on the largest of the Home Islands, Honshu.
The first stage of this project went in service in the year 2000 with a bipolar voltage of 250 kilovolts (kV) and rated to carry 1400 megawatts (MW). The first 50 kilometers of the transmission line run north from the Anan inverter station as an undersea cable.
At Yura ( coordinates: ) there is a switching station, and from there the HVDC line runs for another 50 km as an overhead power line.