In its forecasting studies incorporating the electrification of uses, the integration of RE etc., RTE confirms the future need of the network, in terms of energy flexibility. The tertiary sector accounts for a significant proportion of the country’s electricity consumption… According to its renovation, it gradually chooses electronic control solutions to "consume less and in a better way" its energy. Thus, it gradually becomes a "smart and supportive brick" of the Network. When necessary, at peak times, it can provide the network with an energy “erase” service. What role should it play in the future in the energy balance of the network? How can this energy flexibility service be implemented on the ground? Methodology and sharing of good actions.