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This paper plays a role for electricity providers, who are actively developing digital meters and power management systems, and develops an energy management system by using service-oriented architecture. In addition to a power management system, the policy has changed from the traditional way in Taiwan by using energy-saving appliances. Therefore, the solution is to design devices that are more intelligent and energy saving at the same time. Moreover, computers can control the mechanism of the smart devices. The system uses a service-oriented architecture approach to construct services and utilize common virtualization technologies on cloud infrastructure. This work also applies distributed storage technologies to store and distribute data in order to make sure the system can meet massive loads of demands for services. Finally, we not only show provided services and hardware control in the implementation but also conduct performance tests of the distributed database.