Method for determining an individual power consumption

System of monitoring of an individual power consumption in an electric installation comprising a group of individual electric power distribution branches and a main upstream line connecting the group of branches to an electric power supply, each individual electric power distribution comprising a circuit breaker, the monitoring system comprising

• a device for measuring the current and the voltage at the level of the main upstream line and for measuring the voltage of at least one individual distribution branch downstream of the circuit breaker,
• a meter of the general power consumed by the group of branches from the current and the voltage of the main upstream line;
• a calculation device configured to calculate the individual power consumption of the individual distribution branch based on a current flowing through the individual distribution branch and on the voltage of the individual distribution branch;
• and
• a corrector for correcting the individual power consumption, by correlation of the instantaneous electric power consumption variations simultaneously observed at the level of the individual distribution branch and of the main upstream line;
• wherein the calculator device is configured to calculate the current of the individual distribution branch based on the difference between the voltage of the main upstream line and the voltage of the individual distribution branch.