Solar thermal technologies (STTs) are mature in many EU Member States. However, in some EU regions solar applications, and especially the innovative ones (such as solar heating/cooling, solar drying, solar-powered desalination), remain at an early stage. The degree of development of each market does not depend on climate conditions (e.g., insolation) or on different technological developments. The major strengths, weaknesses, opportunities and threats of ST-Fs are examined, in order to identify the most important actions that should be taken to reduce existing barriers, as opposed to RTD (Research and Technology Development) of the new STTs. These include financing schemes, publications, electronic dissemination tools, campaigns, events, creation of information centres, audits and studies.