The Energy Data Innovation Network (EDI-Net) will use smart energy and water meter data to accelerate the implementation of sustainable energy policy. It will do this by increasing the capacity of EU public authorities to act quickly and decisively. The capacity will be increased by the provision of just the right amount of intelligible information, by training and exchange of experiences of Public authorities and by provision of tools and support to implement and monitor their sustainable energy plans. To move beyond the traditional technical energy manager approach to use the information to engage with decision makers, finance mangers and building users. To make energy more “visible”. To make energy and water date “more exciting” to buildings users. Innovation in terms of using big data analytics to address issues at scale. Big data; thousands of EU public buildings; information for decision makers, finance managers and building users; benchmarking of EU public buildings; and monitoring implementation of Sustainable Energy Action Plans or local Climate Protection Plans.The core of EDI-NET is the analysis of smart meter data from buildings, from renewable energy systems and from building energy management systems (BEMS) using Big Data analytics technologies. The attractive fruit around this core is an online forum to spread knowledge and facilitate exchange of experience and best practice through peer to peer education in a friendly and useful way. The tree that supports and ripens the fruit is the existing European network of Climate Alliance that builds the capacity of EU public authorities to more effectively implement sustainable energy policies. We recognise the smart meter data, by themselves, will not implement sustainable energy policy. However, when combined with on-line discussion forum, local campaigns, awareness raising and peer to peer knowledge transfer it can achieve savings of between 5 and 15 percent; at least 16 GWh/yr, worth over 1.5 M€.