1. A method for optimizing a composite load disaggregation in an electrical environment characterized in that, the method comprising: performing a factor-graph analysis on one or more input variables to generate confidence measures for one or more appliances in the electrical environment, wherein the confidence measures indicate the composite load disaggregation; retrieving contextual information impacting the usage of the one or more appliances from a contextual information database; and optimizing the composite load disaggregation by applying one or more rules to the confidence measures and to the contextual information for identifying at least one appliance from the one or more appliances, wherein the performing, the retrieving and the optimizing are performed by at least one processor.