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The optimal control strategy for autonomous micro-grids proposed in this paper highlights the possibility to minimize the overall micro-grid operating cost, minimizing at the same time the pollutants emissions and assuming that all the power made available by the renewable generators (photovoltaic and wind systems) and the storage systems is injected into the micro-grid. The proposed procedure is based on a hierarchical control architecture. The optimization procedure has been performed on a test micro-grid and verified by computer simulations. The numerical results show that the solutions found by the centralized optimization procedure can improve the micro-grid performances with respect to the ones that can be obtained from the generators local control.