This document discusses the SmartReFlex project which aims to provide guidance and recommendations for European cities to transition their district heating and cooling systems to 100% renewable sources. It provides a guide for local authorities, recommendations for establishing task forces, six regional strategies and action plans, training materials used to educate over 500 people, and 20 case studies on real renewable district heating plants and policies. It also announces a series of webinars on topics like solar district heating design, heat planning, and strategic regional planning towards renewable district heating and cooling.