This paper proposes a novel energy management method for distributed generation systems using a fuel cell vehicle and photovoltaic cells and validates the usefulness of the proposed energy management method. The proposed method can be used not only in normal daily operation but also in emergency operation. In the normal daily operation, the utility grid can supply power to the domestic power load. The proposed method is evaluated on the basis of the reduction rate in power fluctuation and operating cost per day. On the other hand, the utility grid cannot supply power to the domestic power load during the emergency operation. Thus, the proposed method is evaluated by the number of operative days. As a result, the proposed method reduces 40% of the power fluctuation, and the operating cost in the normal daily operation become cheaper. In the emergency operation, the proposed system can operate until electricity is restored.