At $4M per km, a 4,300 km HVDC cable would cost a staggering $17.2 billion to import 1.75 GW of energy. Interestingly, building a Shin-Kori equivalent nuclear plant [1],[2] on a nearby island [3] would be significantly cheaper. If they can afford such a cable, it raises the question of whether it's even the best solution in the first place. [4]
[1] Aerial view of the plant: https://www.google.com/maps/place/Kori+Nuclear+Power+Plant/@...
[2] https://en.wikipedia.org/wiki/Kori_Nuclear_Power_Plant
[3] Possible location, suitable by size: https://www.google.com/maps/place/Lazarus+Island/@1.2057214,...
[4] Singapore is not denying such possibility https://www.channelnewsasia.com/singapore/nuclear-energy-fus...