The present invention provides a method for determining consumption of appliances within a surveyed household in which there are no sensors for measuring consumption of specific appliances. The method comprises—pre-processing historical consumption of appliances in a group of sampled household, based on measurements performed by sensors associated with said appliances, in relation to profiles of households, including characteristics of each household and/or lifestyle of the occupants and environmental time dependent parameters, —detecting presence of an appliance in a surveyed household based on correlations between the household profile and consumption patterns based on sampled measurement taken at predefined discrete time periods such 1 minutes, —detecting periodic activation in the surveyed household based on detection of presence of each appliance, identified correlations to household profile and consumption pattern and—estimating consumption of each appliance is the surveyed households based on detection of periodic activation of each appliance, identified correlations to households profile and consumption pattern.