This article aims at studying the evolution of the domestic consumption of energy in Reunion island between 1980 and 2005 (electricity consumption). It shows that this area which reached its energetic autonomy at the beginning of the 80’s has known a strong dependency from fossil resources for the last two decades, due to the increasing pressures of demographic, economic and sociological factors. Since the beginning of the 2000’s, as a result of public policies impulsion (mainly fiscal policies), Reunion island has developed the use of renewable resources (essentially photovoltaic). It tends to be now one of the first French and European regions mastering this energy production process.