After the Great East Japan Earthquake, Home Energy Management System (HEMS) is watched with interest to conserve electric power consumption. There is a study to more easily control home electric appliances. Moreover, there is a study of visualization for electric power consumption, water and gas. However, the control is hard to determine whether an appliance or communication is a problem in occurrence of an error, and the visualization has difficulty in continuous use. Requirement

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... are two environmental offers. First environment realizes long-term operation of HEMS. Second environment realizes continuous usage of HEMS. This paper develops a HEMS service for long-term operation and continuous usage. The service is implemented by Raspberry Pi, F-PLUG and ECHONET Lite. The service is estimated by two questionnaires. First questionnaire compares our service with existing services. Second questionnaire estimates our service with four phases.