Methods and apparatus for forecasting an energy output of a wind farm. A method for forecasting an energy output of a wind farm includes maintaining a data base of wind patterns, each wind pattern being associated with an energy output that the wind farm produces. The method includes receiving a current wind pattern. The method includes searching the data base for a wind pattern that matches the current wind pattern. The method includes calculating a forecast energy output that the wind farm will produce in response to the current wind pattern, the calculation being based, when there is a matching wind pattern in the knowledge base, on the energy output associated with the matching wind pattern.