A method for managing the supply of electric energy to an electric apparatus by an electric energy supplier, comprising: - having a certifier system defining a reference electric power profile univocally associated to an authorized electric apparatus; - having the certifier system providing a device couplable to the electric apparatus and to a socket delivering electric energy provided by the electric energy supplier, said device being univocally associated to said authorized electric apparatus through said reference electric power profile by a firmware/software module installed in said device and configured to recognize said reference electric power profile; - having a user of the electric apparatus coupling, through said device, the electric apparatus to the socket for supplying electric energy; - having said device checking if the electric apparatus coupled to the socket through the device is the authorized electric apparatus to which the device itself has been univocally associated, by comparing a measured electric power profile of the electric apparatus with said reference electric power profile, said measured electric power profile of the electric apparatus corresponding to a current electric power absorption of the electric apparatus and, - if the current electric power absorption of the electric apparatus does not match the reference electric power profile, having the device assessing that the electric apparatus is different from the authorized electric apparatus to which the device has been univocally associated; - if the current electric power absorption of the electric apparatus matches the reference electric power profile, having the device carrying out the following operations: - assessing that the electric apparatus is the electric apparatus to which the authorized device has been univocally associated, and - collecting measures about the electric power absorbed by the electric apparatus and certifying them as energy consumptions corresponding to the authorized electric apparatus to which the device itself has been univocally associated. - having a certifier system defining a reference electric power profile univocally associated to an authorized electric apparatus; - having the certifier system providing a device couplable to the electric apparatus and to a socket delivering electric energy provided by the electric energy supplier, said device being univocally associated to said authorized electric apparatus through said reference electric power profile by a firmware/software module installed in said device and configured to recognize said reference electric power profile; - having a user of the electric apparatus coupling, through said device, the electric apparatus to the socket for supplying electric energy; - having said device checking if the electric apparatus coupled to the socket through the device is the authorized electric apparatus to which the device itself has been univocally associated, by comparing a measured electric power profile of the electric apparatus with said reference electric power profile, said measured electric power profile of the electric apparatus corresponding to a current electric power absorption of the electric apparatus and, - if the current electric power absorption of the electric apparatus does not match the reference electric power profile, having the device assessing that the electric apparatus is different from the authorized electric apparatus to which the device has been univocally associated; - if the current electric power absorption of the electric apparatus matches the reference electric power profile, having the device carrying out the following operations: - assessing that the electric apparatus is the electric apparatus to which the authorized device has been univocally associated, and - collecting measures about the electric power absorbed by the electric apparatus and certifying them as energy consumptions corresponding to the authorized electric apparatus to which the device itself has been univocally associated. - assessing that the electric apparatus is the electric apparatus to which the authorized device has been univocally associated, and - collecting measures about the electric power absorbed by the electric apparatus and certifying them as energy consumptions corresponding to the authorized electric apparatus to which the device itself has been univocally associated.