The overall objective of EnRiMa is to develop a decision-support system (DSS) for operators of energy-efficient buildings and spaces of public use. By providing integrated management of conflicting goals such as cost minimisation, meeting energy, efficiency, and emission-reduction requirements as well as risk management, the DSS will enable operators to improve building energy efficiency in the most cost-effective manner based on their tolerances for comfort and risk. The DSS will be seamlessly integrated with the existing ICT for controlling each site's energy sub-systems, thereby facilitating the operators' real-time on-site generation dispatch, off-site energy purchases from diverse sources, and open positions in energy markets. The DSS will also enable long-term planning aimed at increasing energy efficiency, specifically analysis of retrofits and/or expansion of on-site energy sub-systems, in order to meet forthcoming EU targets for reducing CO2 emissions. A laboratory facility in Bizkaia, Spain will serve to test the operation of the DSS, while a community centre in northern Spain and a college campus in Austria will be the venues for the validation exercise. These site tests will enable cost-benefit analyses along with policy lessons for potential users of the DSS via workshops so that they may be able to reduce energy consumption and CO2 emissions by up to 10% in certain cases and improve sub-system integration in line with EU targets. In conjunction with preliminary market analyses and an exploitation plan, the DSS will be ready to make a wide impact at the project's termination by leading to the opening of a market for ICT-based solutions for buildings.