This study shows the performance of co-generation system operated by micro gas turbine (MGT) in a snowy and cold area. In the experiment it was clarified that the characteristics of generating efficiency, heat recovery efficiency, and the other parameteres were obtained under lower ambient temperatures. As the results, generating efficiency increased with the decrease of the temperature and the co-generation system could operate smoothly although the ambient temperature reached downward to -20℃. It was also found that the exhaust energy from the system became significantly effective to a snow melting equipment and bio-gas plants in public facility, as the practical applications.