"Brian Gaff" wrote in message
...
Well the higher the frequency the more efficient transformers are, and can
be smaller as witnessed by switch mode supplies.
I think for distribution reasons, the delivery would still be AC though.
As a matter of interest, those who use the high voltage DC grids, how do
they convert to AC when needed. have to be one large inverter!

Brian

No that's incorrect.
Higher frequency = smaller physical sized motors & transformers but greater
losses.
Aircraft run on high frequency power to save weight.