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Wireless sensor and actuator networks (WSAN) integrated with computer intelligence have recently been proposed for a large range of applications for energy management systems. This paper presents an original smart platform for Home Energy Management System, which embeds computer intelligence for optimization of the power consumption of controllable appliances based on retail pricing schemes, knowledge representation by classification rules of different appliances and decision trees based on their consumption behavior, without disturbing the living comfort of the home owners. Our platform provides easy access to selected displays of switching status and consumption of all appliances, as well as remote overview of the information in tabular and graph form data and power consumption control via smart phones and remote terminal computer. As an additional benefit, the system detects supply voltages out of the allowed limits and protects controllable appliances by switching off the supply.