Comparing Ordered Weighted Averaging (OWA) and Copeland score for composite indicators in the field of security of energy supply

In this paper we compare two composite indicators for the security of energy supply in the European Member States (MS), obtained by two different aggregation rules derived from the Group Decision Theory. Both aggregation rules are made on the scores of a set of individual Performance Measures (PMs). In general, different PMs based on different definitions may lead to different rankings of the countries. This situation could be controversial for a Decision-Maker (DM), whose responsibility is, for example, to achieve a better performance level. In a previous work, the authors proposed a procedure, based on OWA to rank MS using PMs derived from an energy model, assessing different aspects of the security of supply. OWA is an aggregating procedure able to take into account the preference of a DM. In this paper we aggregate those PMs using a simple but efficient procedure, the Copeland Score (CS). CS is a non-parametric ranking technique that does not require any information from the DM. We compare the results with the ones obtained using the OWA rule. Exploratory sensitivity analyses are carried out to assess which composite rule (between OWA and CS) is more robust to data and other subjective uncertainties.