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Deregulation of energy sectors provides challenges and opportunities alike for operators of public buildings.Exposure to energy prices and CO 2 emissions restrictions create incentives to adopt more energy-efficient technologies. Yet, market and technological uncertainties necessitate decision support for risk management. We present a decision support system (DSS) being developed for integrated management of energy efficient buildings. This tool intends to provide decision support for building operators to help them meet their needs in a more efficient, less costly, and less CO 2 intensive manner. This paper gives an overview of the strategic DSS module and focuses how the operation DSS module has been conceived starting from mathematical formulation and ending with a validation exercise in a laboratory building.