A method for monitoring a change over time of at least one activity of a person in a dwelling equipped with an electrical installation comprising at least one electrical equipment, the method being executed by a processing circuit and comprising: a) obtaining, for a time period subdivided into a plurality of consecutive time intervals, a time series comprising, for each time interval, a value, associated with said time interval, indicating a level of consumption of at least one piece of electrical equipment of the electrical installation during said time interval, b) for each time interval, comparing the value associated with said time interval with at least one reference value, the method further comprising, for at least one activity of the person: c) based on the comparisons, determining targeted information indicative of said person's activity over the time period, and d) monitoring a change over time of said person's activity based on said targeted information and at least one targeted reference information item indicative of a usual activity of the person during a plurality of reference time periods preceding said time period, a method wherein at least one activity of the person is a presence or absence of the person during at least one portion of the time period, characterised in that: - the targeted information indicative of said presence or absence of the person is a targeted information item of the type of a presence indicator, - the at least one reference value includes a passive power consumption value, the method comprising: b1) for each time interval, comparing the value associated with said time interval with the passive power consumption value, and c1) for said presence or absence of the person, based on the comparisons, determining the targeted information of the type of a presence indicator so as to indicate the time period as being: - a period of absence of the person if each value associated with a time interval is less than or equal to the passive power consumption value, or - a period of presence of the person during the time period if at least one value associated with a time interval is greater than the passive power consumption value. a) obtaining, for a time period subdivided into a plurality of consecutive time intervals, a time series comprising, for each time interval, a value, associated with said time interval, indicating a level of consumption of at least one piece of electrical equipment of the electrical installation during said time interval, b) for each time interval, comparing the value associated with said time interval with at least one reference value, the method further comprising, for at least one activity of the person: c) based on the comparisons, determining targeted information indicative of said person's activity over the time period, and d) monitoring a change over time of said person's activity based on said targeted information and at least one targeted reference information item indicative of a usual activity of the person during a plurality of reference time periods preceding said time period, c) based on the comparisons, determining targeted information indicative of said person's activity over the time period, and d) monitoring a change over time of said person's activity based on said targeted information and at least one targeted reference information item indicative of a usual activity of the person during a plurality of reference time periods preceding said time period, - the targeted information indicative of said presence or absence of the person is a targeted information item of the type of a presence indicator, - the at least one reference value includes a passive power consumption value, b1) for each time interval, comparing the value associated with said time interval with the passive power consumption value, and c1) for said presence or absence of the person, based on the comparisons, determining the targeted information of the type of a presence indicator so as to indicate the time period as being: - a period of absence of the person if each value associated with a time interval is less than or equal to the passive power consumption value, or - a period of presence of the person during the time period if at least one value associated with a time interval is greater than the passive power consumption value. - a period of absence of the person if each value associated with a time interval is less than or equal to the passive power consumption value, or - a period of presence of the person during the time period if at least one value associated with a time interval is greater than the passive power consumption value.