Looking into the Root Causes of Power Shortage

The year 2011-another power-shortage year is gone.It is a year seeing a different power shortage from those in the previous ones.It is a power-shortage year full of conflicts and lack of wide understanding. "Soft power shortage" is a new phrase,meaning that power shortage emerges under the condition of adequate installed capacity.At present,the power generation companies in China are in a very difficult time,suffering great losses because of high coal price and short coal supply.Coal-fired units shutdown plus sharp hydro generation decline in spring resulted in serious power shortage.Why did this happen? Let's analyze the root causes of electricity shortage in 2011.