It has been presented processes occurring dur-ing the storage of wood chips for energetic purpos-es. As a result of carried out investigations, it was presented dependences of temperature and relative humidity changes of the surrounding air on biomass storage. Modified Henderson equation can be uti-lized for computer simulation of storing and drying processes concerning wood chips for energetic purposes. Modified Henderson equation also re-flects very much obtained results from experiments carried out with the above-mentioned material. Using a computer simulation program we can simu-late different wood chips storing conditions to avoid overheating and material loss problems.