The capacity of a wind turbine is a measure for the maximum electricity production per unit of time, expressed in megawatts (1 MW equals 1 million watt). The actual energy production of a wind turbine may vary considerably and depends, for instance, on the amount of wind and the location of the turbine.

In 2006, the energy production of one 2 MW turbine (used throughout the year) ranged between 3 and 6 thousand MWh (megawatt hours). This corresponds to the average electricity consumption of 900 to 1,900 households.