China has been building two wind turbines every hour, the International Energy Agency (IEA) has told BBC News.
This is the world's biggest programme of turbine installation, double that of its nearest rival, the US.
The nation’s entire annual increase in energy demand has been fulfilled from the wind.
But the IEA warns China has built so much coal-fired generating capacity that it is turning off wind turbines for 15% of the time.
The problem is that coal-fired power stations are given priority access to the grid.
An IEA spokesman told BBC News: “The rather rosy statement on wind energy hides the issue that 2015 and the first half of 2016 also saw record new installations of coal.
“China has now a clear over-supply. In the province of Gansu, 39% of wind energy had to be curtailed (turned off because there is not enough capacity on the grid).
The average European wind farm is forced to stop generating between 1-2% of the year.