  In this paper, ENTROPY platform, an IT ecosystem for supporting energy
efficiency in buildings through behavioural change of the occupants is
provided. The ENTROPY platform targets at providing a set of mechanisms for
accelerating the adoption of energy efficient practices through the increase of
the energy awareness and energy saving potential of the occupants. The platform
takes advantage of novel sensor networking technologies for supporting
efficient sensor data aggregation mechanisms, semantic web technologies for
unified data representation, machine learning mechanisms for getting insights
from the available data and recommendation mechanisms for providing
personalised content to end users. These technologies are combined and provided
through an integrated platform, targeting at leading to occupants' behavioural
change with regards to their energy consumption profiles.
