Abstract: A method of classifying consumption of at least one utility by a plurality of consumers acquires, or determines, a plurality of utility consumption metrics. Each utility consumption metric has a value which is indicative of an aspect of consumption by one of the plurality of consumers over a single time period or across multiple time periods within a larger time frame. The method sorts the plurality of utility consumption metrics according to metric value. The method forms clusters of the sorted utility consumption metrics to identify boundaries between the clusters of the sorted utility consumption metrics. The boundaries between the clusters of the sorted utility consumption metrics define different classes of utility consumption by the consumers and divide the consumption metrics of the consumers into the different classes.