Smart Grid technology stands as a solution in activating the demand side. Enabling a greater monitoring and control of power consumption is a key feature for reaching the energy efficiency and environmental targets fixed by the authorities. For a decade now, demand side management (DSM) programs enabled by smart technologies are showing significant results with respect to energy savings and peak load reductions. Several conclusions and recommendations have been drawn from experimentations feedbacks. However, those conclusions deeply depend of the generation mix of one country as well as the design of its DSM programs.