That would be one difference, they compete. That means the state sets them up and then allows them to operate. This would I suspect be part of the reason for the success of China’s hybrid state and private capitalism. In South Africa the government won’t even allow Eskom to operate in a competitive manner. I have no reason to believe they won’t engage in negative meddling in a second operator. There are other differences with China. For instance corruption is rampant, but never allowed to interfere with operations. Another is that in China workers have almost no rights and dissent is quickly put down. Very much like the old days in the US where both state and private forces were used to keep the workers in their place.
As an example if power station workers had blockaded or in any way attempted to interfere with the operation of a power station in China as they did recently in South Africa armed police and the army if necessary would have been deployed and those involved would have desisted or been shot. Or just shot to set an example.