This paper presents a methodology for identifying the most suitable place, based on some criteria, in which to install and operate a Wave Energy Converter (WEC), that is an electricity generator that exploits the wave motion of the sea. The methodology consists in the identification of a not small number of alternatives (the possible sites in which to place the WEC), the evaluation of these on a set of heterogeneous criteria (criteria on the resource to be exploited but also strategic and cost criteria) and finally the creation of one or more final rankings that order the selected alternatives in a ranking based on their performance on the criteria through the use of one or more Multi Criteria Decision Methods (MCDMs).