China is in the middle of a huge power crunch as extreme weather, surging demand for energy and strict limits on coal usage deliver a triple blow to the nation’s electricity grid. It’s a problem that could last for months, straining the country’s economic recovery and weighing on global trade.China is in the middle of a huge power crunch as extreme weather, surging demand for energy and strict limits on coal usage deliver a triple blow to the nation’s electricity grid. It’s a problem that could last for months, straining the country’s economic recovery and weighing on global trade.