1. A computer program product comprising a tangible storage medium readable by a processing circuit and on which instructions are stored for execution by the processing circuit for performing a method, comprising: upon receiving utility consumption data of a group of elements, defining clusters of elements by like geography and like utility consumption; evaluating a significance of each cluster by comparing an average utility consumption within the cluster with utility consumption of elements neighboring the cluster; and determining from a result of the evaluating which clusters exhibit significant differences in utility consumption from the neighboring elements and defining those clusters as regional outliers.