[da_big_ghey]

Motors, compressors still are more efficient on AC, for place like American South where air conditioning represent largest segment from electricity expense AC grid remains making sense.

[stephen_g]

Yes, but the very most efficient AC motors and compressors motors use variable frequency drives, and you can design a VFD powered by either AC or DC.

I still do think AC is still advantageous in a lot of ways for power grids though, just not on that particular point.