The project SESAME utilizes smart metering, building automation and policy-based reasoning to support home owners and building managers in saving energy and in optimizing their energy costs while maintaining their preferred quality of living. In this paper, we present how user-created policies are being applied to develop a system of least interference that supports the user in gaining awareness about energy consumption habits and saving potentials. Proposed concepts are currently being implemented and validated in an extensible demonstrator platform which provides a proof-of-concept for an innovative technical solution.