NOVELTY - The method involves providing a multi-objective optimization algorithm (A) for determining a value of a discrete variable (Vi) that is representative of activity of a set of electricity consumption sources (mi) or electrical appliances. An error function (F) entering total measured consumption (S) of the sources is minimized. A cross population of crossed individuals chosen in a pseudo-random manner by taking census probability (qj) into account is generated, and a current population is upgraded by adding individuals selected from the crossed individuals.    USE - Method for identification of electricity consumption sources such as electrical appliances in a field such as industrial field, service field, building, for personal use or professional use, tertiary sector, rental building or individual building. Can also be used for identification of electricity production sources such as heat pump, photovoltaic panel, hydroelectric station and thermal plant.    ADVANTAGE - The cross population of crossed individuals chosen in the pseudo-random manner by taking census probability into account is generated, and the current population is upgraded by adding between individuals selected from the crossed individuals, thus allowing identification of total consumption measured on preset time intervals and during a predetermined time period. The method allows identification of over cost consumption sources in a robust and fast manner. The method allows provision of time slots for the consumption sources for better distribution of consumption with regard to time and avoids peaks.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a device for identification of electricity consumption sources.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a device for identification of consumption sources    Multi-objective optimization algorithm (A)    Error function (F)    Total measured consumption (S)    Discrete variable (Vi)    Electricity consumption sources (mi)    Census probability (qj)