There is a large number of combined heat and power units in northern China. and due to the limit of heating demand. the operating mode of setting electricity by heat of combined heat and power units has seriously took over the consumption space of other energy. resulting in severe wind power curtailment and rationing situation in some areas. https://www.roneverhart.com/Western-Digital-Ultrastar-DC-HC550-WUH721816ALE6L0-0F38460-16TB-7-2K-RPM-SATA-6Gb-s-512e-ISE-3-5in-Hard-Drive/