Apparently part of the issue is that the Chinese grid is very badly managed.
They can build physical grid connections much more easily than we can manage (for the usual values of “we”), but they manage interprovincial transmission according to fixed schedules rather than responding to demand.
Undoing dumb rules that favour existing vested interests is hard everywhere.
I mean, the US doesn't exactly cover itself in glory in its own utility regulations. "cost-of-service" regulation means that monopoly utilities are allowed to charge such that they make a regulated rate of return on the cost of providing the service. So the more they increase their costs, the more money they are permitted to make!
"Relatively easy" is a poor phrasing choice on my part. It's still very hard, but it's one of the easiest in a list of really hard tasks. Solving climate change involves a lot of really hard problems.
They can build physical grid connections much more easily than we can manage (for the usual values of “we”), but they manage interprovincial transmission according to fixed schedules rather than responding to demand.