The demonstrators constitute a package of innovative state-of-the-art energy efficient technologies, systems and practices. To cover the whole CELSIUS City concept within​ this demonstration project, 12 new demonstrators will be built. The demonstrators already in operation will secure a full range of innovations and solutions covering the five categories necessary to display and demonstrate the CELSIUS City commitment. In the menu below, the demonstrators can be sorted under the five categories: End User, Infrastructure, Storage, Sustainable Production, and System Integration. (The demonstrators can also be sorted under each partner city.)