Educational buildings constitute 17% of the non-residential building stock in the EU [1], while recent work shows that a focus on energy use in schools can potentially yield an array of rewards, in concert with educational excellence and a healthy learning environment [2]. Having these in mind, GAIA1, a Horizon2020 EC-funded project, is developing an IoT platform that combines sensing, web-based and gamification elements, in order to address the educational community. Its primary aim is to increase awareness about energy consumption and sustainability, based on real sensor data produced by the school buildings where students and teachers live and work, while also lead towards behavior change in terms of energy efficiency.