section_path: Wind power capacity and production/Capacity factor
section_name: Capacity factor
paragraph_text: Capacity factor
  
  Since wind speed is not constant, a wind farm's annual energy production is never as much as the sum of the generator nameplate ratings multiplied by the total hours in a year. The ratio of actual productivity in a year to this theoretical maximum is called the capacity factor. Online data is available for some locations, and the capacity factor can be calculated from the yearly output.