China is home to half the world’s coal-fired power stations, the most polluting type of generator. Their share of the country’s electricity market is shrinking as nuclear plants and renewables slowly elbow them off the grid. But Chinese investors and local governments are still keen on them. Last year coal-fired generating capacity expanded in China by 37gw (factoring in plant closures)—more than the amount by which it grew globally. China has been relaxing curbs on building such plants. That suggests more to come.

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