At November 24-25, 2016 a joint workshop regarding the development of a CityGML Application Domain Extension (ADE) has taken place in Ferrara, Italy.
The Workshop has been supported by Interreg Central Europe, OGC and SIG3D, Sinergis and Sipro was an opportunity to gather requirements, ideas, suggestions, and experiences from CityGML users, data producers, software vendors, and scientists developing and using the CityGML Energy Application Domain Extension.
Further information at the EnergyADE wiki page.