Apparently not a problem to do today.
https://en.m.wikipedia.org/wiki/Synchronous_grid_of_Continen...
https://en.m.wikipedia.org/wiki/Synchronous_grid_of_Continen...
This might counter the grandparent poster if Asia was on the same synchronous grid, but it's not.
Here's the map including all larger powerlines
It spans 8 timezones.
Europe is just larger in capacity, not breadth.