Murika coal fired powerplants likely have thermal efficiency of about 33%.(link: CHP Benefits | US EPA)

China has been working very hard to build supercritical plants

link to a 5yrs old article: Everything You Think You Know About Coal in China Is Wrong - Center for American Progress ---long article worth reading

(CO2 emission of the china top100 is about those of yank⇒china average power plants are usually bigger, ie trying to limit coal freight rail length.  Thermal efficiency about 31% higher. China 2021 total electricity generation is about  1.9 times that of murika)