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Abstract: The concept of sustainability can be a way to understand the dynamics of reality and to consider not only the economic growth but also the social, environmental and cultural aspects of development. This new paradigm questions the role of nature as an instrument only to satisfy the human needs and brings into consideration the rational use of natural resources through responsible environmental policies keeping in mind the needs of the future generations. The economic growth, considered as the notion of progress, brings intrinsically not only the extensive nature exploitation but also the intensification of the energy use. Energy sources become, then, a strategic variable for the economic development. The Brazilian energy policy is an appropriate case study for the paradigm of sustainability overview as it is characterized by isolated initiatives and programs, which culminated into a huge crisis. So, this paper aims to discuss the concepts of sustainability and ethics through the analysis of the Brazilian energy policy and its social and environmental implications. [Copyright &y& Elsevier]