Not that much actually, unlike most of the world China actually has been scaling up renewables at a significant rate. The only problem is that they’ve been adding new coal plants aswell, and it might be hard to justify shutting down brand new plants, but there is actually a argument to be made that solar production is increasing as fast as economically feasible.

Nuclear is not bottleneckd in the same fields, and does have some significant advantages for supplementing renewables, namely in reliability, transmission efficiency, footprint, and raw resource requirements.