System for managing energy at a technical site having technical equipment (ei/m) which consumes or produces energy and is distributed in premises or outside buildings for production, storage, packaging, shipping, or even office or residential premises, including: - division of the site into zones (Zj) forming individually treated cells, - a unit for managing the technical equipment (ei/m) of the site between the zones (Zj), - a program for distributing, tracking and updating the technical equipment (ei/m) of the zones (Zi) between technical equipment categories (Ei), - a distribution table of the technical equipment (ei/m) prepared by the management unit applying the program, the table being the instantaneous image of the technical equipment of the site in its different zones (Zj) and according to the technical categories (Ei), - a database containing the instantaneous state of the technical equipment (ei/m) and of the parameters thereof, - control devices such as sensors forming part of the technical equipment (ei/m) and constituting the technical equipment, which control devices are associated with the technical equipment (ei/m) installed in the zones (Zj), and transmit state information (Izi) of the equipment (ei/m) to the management unit, - a database of replacement equipment organised into categories (ERi) parallel to the technical categories (Ei) of the database to be supplied to the central processing unit, - thresholds (Sei) associated with the different technical categories (Ei) and with the technical equipment (ei/m), - a comparison subprogram belonging to the program for applying the thresholds to the state of the technical equipment (ei/m), and generating control signals by making comparisons, i.e. by monitoring the change in the state of an item of technical equipment (ei/m) or in the accumulation (LEi) of the technical equipment (ei/m) of the category (Ei) of all the zones (Zj) or a set of zones that are selected and controlled in order to propose the replacement of equipment (ei/m) by replacement equipment (ERi) in order to improve the energy management of the technical site. - division of the site into zones (Zj) forming individually treated cells, - a unit for managing the technical equipment (ei/m) of the site between the zones (Zj), - a program for distributing, tracking and updating the technical equipment (ei/m) of the zones (Zi) between technical equipment categories (Ei), - a distribution table of the technical equipment (ei/m) prepared by the management unit applying the program, the table being the instantaneous image of the technical equipment of the site in its different zones (Zj) and according to the technical categories (Ei), - a database containing the instantaneous state of the technical equipment (ei/m) and of the parameters thereof, - control devices such as sensors forming part of the technical equipment (ei/m) and constituting the technical equipment, which control devices are associated with the technical equipment (ei/m) installed in the zones (Zj), and transmit state information (Izi) of the equipment (ei/m) to the management unit, - a database of replacement equipment organised into categories (ERi) parallel to the technical categories (Ei) of the database to be supplied to the central processing unit, - thresholds (Sei) associated with the different technical categories (Ei) and with the technical equipment (ei/m), - a comparison subprogram belonging to the program for applying the thresholds to the state of the technical equipment (ei/m), and generating control signals by making comparisons, i.e. by monitoring the change in the state of an item of technical equipment (ei/m) or in the accumulation (LEi) of the technical equipment (ei/m) of the category (Ei) of all the zones (Zj) or a set of zones that are selected and controlled in order to propose the replacement of equipment (ei/m) by replacement equipment (ERi) in order to improve the energy management of the technical site.