The operation follows good planning practice The proposed interventions plan primarily meets the energy needs of closed gyms Utilizes the potential for energy savings leading to energy saving and based on its new energy profile, interventions of Renewable Energy Sources systems and installation of an active solar system ZNX in the facilities of closed gymsThe establishment of the netmetering and virtual netmetering methodology leads to the optimal performance of the system with consequently the maximum energy savings, the reduction of pollutants at national level and a very significant reduction in energy costs The proposed interventions plan after its implementation will achieve primary energy savings of 53 compared to the current operating situation, a percentage too large for the closed gyms of Mikra, while the reduction of the emitted pollutants that will occur as a result of the implementation of the energy upgrading plan is calculated at a rate of 73