Before revision:  To this extent, we decompose the problem in two nested optimization steps: in the inner one we characterize the optimal operating point of the network subject to a required energy consumption figure, while in the  outer step , we provide optimal energy management policies to make the system self-sufficient , given the the statistical description of the energy source .
After revision:  To this extent, we decompose the problem in two nested optimization steps: in the inner one we characterize the optimal operating point of the network subject to a required energy consumption figure, while in the outer step , we provide optimal energy management policies to make the system self-sufficient in the presence of unpredictable and intermittent energy sources .