Heatwave in China Overloads Power Grids.

Several cities in northern China broke heat records for June this week, with temperatures straining the country's electricity supplies and leading authorities to hold mock emergency drills. The persistent heat has already put the country's power grid operators on high alert, with some cities in the south warning firms and people to curb usage. China's National Energy Administration staged a power emergency drill on the state grid's East China network, simulating a power surge and outage to prepare early warning and power management mechanisms.