Abstract: The computer-implemented method for energy efficiency management of an industrial plant comprises at least the following steps: starting from a plurality of files relating to data sheets of industrial appliances, a step of extraction of the image files of graphs containing curves describing the technical characteristics of the industrial appliances; a step of determination of the characteristic equations of the curves, defined in the specific Cartesian space of each graph, starting from the image files of graphs; a step of calculating the energy consumption of each industrial appliance by means of said determined characteristic equations; a step of comparing the calculated energy consumption of each of the industrial appliances with the energy consumption of at least one industrial appliance in an existing industrial plant; if the energy consumption of the industrial plant can be reduced, or if, the energy consumption being the same, the efficiency of the industrial plant can be improved, then a step is carri