Cities and urban areas have been identified as the main opportunity in reaching climate neutrality, as they consume 78% of the world’s energy and produce more than 60% of GHG. This need and vision are shared across EU cities and regions, but the climate neutrality transition process is complex, and many barriers have been identified. Even local and regional authorities have shown commitment to achieve climate neutrality, the lack of appropriate horizontal and vertical CET governance, integrated and holistic solutions and lack capacity (knowledge and resources) to develop and implement CET plans and strategies slows down the development of these process. The general objective of the PLAN4CET project is to support European regions and cities to design, develop and implement Clean Energy Transition plans according to their needs and possibilities. To do so, the project has been conceived as an initiative where different project outputs (methodologies, tools and capability building and technical assistance) will be generated to support EU regions (specially to support medium and small municipalities with a capacity lack) and cities in their CET planning, implementation and monitoring activities. The project will directly support 3 EU regions in improving the Climate and Sustainable Energy Action Plans in pilots to be carried out in Navarra (ES), Skäne (SW) and Emilia Romagna (IT). These regions represent different type of EU regions and will serve as samples to many others in which the learnings and best practices can be transferred. PLAN4CET will be executed by a consortium composed by a group of 11 entities located in 4 European Countries (Spain, Sweden, Italy, and Belgium), involving different type local and regional public authorities together with other entities.