This Application Note shows that the NIR solution based on the combination of Metrohm NIRS DS2500 analyzer and "Ondalys Flash BMP®" prediction model enable a time-saving and efficient determination of the BMP of various substrates that are used with anaerobic fermentation during biogas production. In contrast to the standard procedure, the results become available within just a few minutes. It is for that reason that this solution offers an alternative option for the optimization of anaerobic fermentation and thus the methane yields.