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Currently, the growth in building energy consumption presents raises concerns with greenhouse gases and environmental pollution. The building occupants face significant difficulties to control the consumed power due to several instabilities such as climate change and human behavior. Therefore, it is necessary to have a decision tool that optimizes the consumed energy and ensures an acceptable comfort for the occupants. This article presents an intelligent solution based on an ontology that presents knowledge about the internal and external environment of a residence, as well as the occupants' behavior and activities. The system openness with the external environment, the knowledge presentation flexibility built on Web Ontology Language (OWL) and the possibility of intelligent reasoning using Semantic Web Rule Language (SWRL) are the main reasons for choosing the ontological approach. The proposed ontology is applied to a real home located in the Adrar city, in the Algerian Sahara. A comparison between two scenarios (with and without the proposed system, Ontological Solution for Energy Intelligent Management (OSEIM) revealed the effectiveness of the proposed solution. The obtained results present a significant energy saving of 4.58%. (C) 2019 Elsevier Inc. All rights reserved.