Natural gas has always been expensive in China, so I don't think China ever built many natgas peakers, if any.
Going forward, we can see that batteries are driving American natgas peakers out of business.
That price dynamic is even more pronounced in China, given higher natgas prices and lower battery costs in China. So I don't expect to see any natgas peakers built in the future.
The TAR has less than 4 million people. 300 TWh of electricity would be enough for Taiwan (24 Mn) or the UK (68 Mn) for example.
So I would expect the TAR to be a huge net exporter of electricity, once the hydro plants are ready.