Systems and methods for identifying a wind turbine power inefficiency

The present description relates to an approach that allows wind turbines (60) having a low power, of a number of wind turbines, as described for example in a wind farm (40) may be present to identify. According to one embodiment of the invention, wind turbines (60) low power under pairs (56) wind turbines and on the basis of a comparison of the in each pair (56) observed (76) and expected (80) output of the wind turbines identified.