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Tagan1 t1_ja8uw5q wrote

I assume those take time to set up and get working. China has a number of large cities that get most of their energy from hydro, but late last year there was a big heat wave that caused lower water flow and affected energy production.

They're probably looking to diversify more and need something quick to set up in the meantime, leading to the larger expansion of coal power. Here's an article touching on the heat wave if you're interested: