The potential of hydropower, the biggest renewable energy source globally, remains largely unexploited. Assessing operational costs and ecological impact for new opportunities, requires accurate information on key environmental variables. The EU-funded HYPOS project will address this need by providing a suite of data analysis applications integrating Earth Observation technologies and modelling for the hydropower industry. These include an online decision support tool for investment planning and monitoring, as well as a subscription portal combining satellite data over time, current measurements and detailed estimates for present and near future assessments. The project will add value at an international level, with reliable information on a wide range of water bodies and spatial scales. Sophisticated blue footprint analysis will be used for sustainable monitoring solutions.