A method for controlling a plurality of wind turbines, the method comprising: - For each wind turbine in the plurality of wind turbines: - Providing a model which relates a plurality of wind turbine operation parameters to each other, - Measuring each of the wind turbine operation parameters in the model to obtain corresponding measured wind turbine operation parameter values, and - providing for one of the wind turbine operation parameters an estimated wind turbine operation parameter value, said estimated wind turbine operation parameter value being based on: - The model, and - the measured wind turbine operation parameter values corresponding to the plurality of wind turbine operation parameters except for the wind turbine operation parameter for which an estimated wind turbine operation parameter value is provided, - providing a reliability parameter value for the wind turbine based on a difference value, said difference value being a difference between: - The estimated wind turbine operation parameter value, and - the measured wind turbine operation parameter value corresponding to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided, - controlling the plurality of wind turbines based on the corresponding plurality of reliability parameter values, characterized in that the reliability parameter value is based on a product between - the difference value, and - a sensitivity of produced power with respect to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided. - For each wind turbine in the plurality of wind turbines: - Providing a model which relates a plurality of wind turbine operation parameters to each other, - Measuring each of the wind turbine operation parameters in the model to obtain corresponding measured wind turbine operation parameter values, and - providing for one of the wind turbine operation parameters an estimated wind turbine operation parameter value, said estimated wind turbine operation parameter value being based on: - The model, and - the measured wind turbine operation parameter values corresponding to the plurality of wind turbine operation parameters except for the wind turbine operation parameter for which an estimated wind turbine operation parameter value is provided, - providing a reliability parameter value for the wind turbine based on a difference value, said difference value being a difference between: - The estimated wind turbine operation parameter value, and - the measured wind turbine operation parameter value corresponding to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided, - Providing a model which relates a plurality of wind turbine operation parameters to each other, - Measuring each of the wind turbine operation parameters in the model to obtain corresponding measured wind turbine operation parameter values, and - providing for one of the wind turbine operation parameters an estimated wind turbine operation parameter value, said estimated wind turbine operation parameter value being based on: - The model, and - the measured wind turbine operation parameter values corresponding to the plurality of wind turbine operation parameters except for the wind turbine operation parameter for which an estimated wind turbine operation parameter value is provided, - The model, and - the measured wind turbine operation parameter values corresponding to the plurality of wind turbine operation parameters except for the wind turbine operation parameter for which an estimated wind turbine operation parameter value is provided, - providing a reliability parameter value for the wind turbine based on a difference value, said difference value being a difference between: - The estimated wind turbine operation parameter value, and - the measured wind turbine operation parameter value corresponding to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided, - The estimated wind turbine operation parameter value, and - the measured wind turbine operation parameter value corresponding to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided, - controlling the plurality of wind turbines based on the corresponding plurality of reliability parameter values, characterized in that the reliability parameter value is based on a product between - the difference value, and - a sensitivity of produced power with respect to the wind turbine operation parameter for which the estimated wind turbine operation parameter value is provided.