Energy is a key priority of the current European Commission with its flagship policy initiative of the European Energy Union (EUEU). One key element of the flagship initiative concerns the expansion of renewables and a fundamental redesign of the energy markets in order to promote renewables, decentralized production and an active role for consumers. In its vision for the Energy Union, the Commission aims at putting "citizens at [the EUEU's] core". Changes in energy consumption and production patterns are in fact already occurring on the ground. New players are entering markets hitherto dominated by large manufacturers and distributors of energy. With the arrival of small-scale decentralized energy installations located in domestic backyards, the term "prosumers" emerged, i.e. entities/households that are producers and consumers of energy in one.