[mikhailfranco]

Interesting video on Chinese 'supergrid' from coal plants in the west, to the population centers in the east, a total length of 3,324 km (2,065 miles):

https://www.youtube.com/watch?v=wfG0USvDTew&t=686s

To increase efficiency, they are increasing the voltage to 1.1 MV:

https://www.youtube.com/watch?v=wfG0USvDTew&t=780s