I used the word "TRANSMISSION", not "DISTRIBUTION".

Transmission is the movement of large quantities of power from one place to another.

Distribution is the delivery of large quantities of power to many different places.

DC transmission involves either generating power as high voltage DC (which CAN be done) or converting AC from ordinary generators into high voltage DC. At the other end, where the power is fed from the transmission system into the local distribution system, the DC is converted into AC before entering the distribution system. The losses involved here are balanced against higher losses in AC transmission. For long lines, DC is cheaper. More importantly, DC grids are inherently much more stable since there is no problem with phase synchronization.

Also, the development of superconductive motors and generators for ship use (a ship is now being built using this technology) can reduce the cost and losses of AC to DC conversion. Superconducting motors and generators are nearly 100% efficient, whether AC or DC. Although they are cooled with liquid nitrogen, liquid helium is not necessary. I am not talking about superconducting transmission lines, only superconducting dyna-motors to convert AC to DC and back again.