Most Helpful Member
apparently there are undersea power cables from the Continent to the UK, and these have to be DC because they are under sea water?.
I think that the idea is to reduce the capacitive current to earth.
There are some high voltage, long distance overhead power lines which use DC for the same reasons.
High-voltage direct current (HVDC) technology offers more efficient bulk power transfer over long distances compared to alternating current (AC) systems.