Method for forecasting a yield of a wind park which exists or which is intended to be erected and which has a plurality of wind turbines , wherein in each case a wind turbine has a rotor having a variable rotor speed and rotor blades which can be adjusted in terms of their blade angle, and wherein the wind turbine in each case has an installation control and is constructed in such a manner that - a power output or a torque is adjusted by means of an adjustment characteristic line, - the adjustment characteristic line is in the form of a speed/power characteristic line or speed/torque characteristic line, wherein - the speed/power characteristic line predetermines a relationship between a detected rotor speed and a power which is intended to be adjusted, and - the speed/torque characteristic line predetermines a relationship between a detected rotor speed and a torque which is intended to be adjusted, - in each case at least one variable transmission relationship for noise is taken into account and describes a relationship between a noise signal which is emitted by the wind turbine and a noise imission which results at an imission point, and - predicted weather parameters are taken into account, wherein the weather parameters are classified into - operating weather parameters which are relevant to operation of the wind turbine, and - propagation weather parameters which are relevant to sound propagation, and wherein - the transmission relationship is determined - in accordance with at least one of the predicted propagation weather parameters, wherein in order to forecast the yield an imission-dependent yield forecast is produced for the wind park, wherein - the yield forecast predicts a yield which can be achieved with predetermined imission limits being complied with, and - the yield forecast is produced in accordance with at least one of the predicted operating weather parameters for a forecast time period by means of a forecasting model, and - the forecasting model - models a behaviour of at least one of the wind turbines and/or the wind park in order to comply with the imission limits, and, - to this end, takes into account the at least one transmission relationship. - a power output or a torque is adjusted by means of an adjustment characteristic line, - the adjustment characteristic line is in the form of a speed/power characteristic line or speed/torque characteristic line, wherein - the speed/power characteristic line predetermines a relationship between a detected rotor speed and a power which is intended to be adjusted, and - the speed/torque characteristic line predetermines a relationship between a detected rotor speed and a torque which is intended to be adjusted, - in each case at least one variable transmission relationship for noise is taken into account and describes a relationship between a noise signal which is emitted by the wind turbine and a noise imission which results at an imission point, and - predicted weather parameters are taken into account, - operating weather parameters which are relevant to operation of the wind turbine, and - propagation weather parameters which are relevant to sound propagation, and wherein - the transmission relationship is determined - in accordance with at least one of the predicted propagation weather parameters, wherein - the yield forecast predicts a yield which can be achieved with predetermined imission limits being complied with, and - the yield forecast is produced in accordance with at least one of the predicted operating weather parameters for a forecast time period by means of a forecasting model, and - the forecasting model - models a behaviour of at least one of the wind turbines and/or the wind park in order to comply with the imission limits, and, - to this end, takes into account the at least one transmission relationship. <EOS>