 Above wind speeds of 25 m/s the power output is gradually reduced again until the turbine switches off for protection at about 34 m/s.The electricity is generated at voltages around 400 V and up to 2,300 As and at variable frequency proportional to the variable speed of the rotor.All produced energy is converted into direct current DC by a rectifier inside the nacelle and conducted to the inverters located in the bottom of the turbine tower.