smart city Wien : Vision 2050 Roadmap for 2020 and beyond Action Plan for 2012-15 / City of Vienna Municipal Department 18 - Urban Development and Planning ; Municipal Department 20 - Energy Planningsmart city Wien : Vision 2050 Roadmap for 2020 and beyond Action Plan for 2012-15 / City of Vienna Municipal Department 18 - Urban Development and Planning ; Municipal Department 20 - Energy Planning