Abstract
The article deals with the topic of implementation of renewable energy sources (RES) in architecture. The method of comparative analysis was adopted in order to identify certain directions, emerging trends regarding the use of solutions based on RES in architecture at various scales. Conclusions were formulated on the basis of study visits and analysis of selected national pavilions at Expo 2015 in Milan and the main assumptions related to the implementation of the adopted solutions and strategies for sustainable development. The article also analyses policies related to the application of advanced technologies in the Digital Smart City Milano 2015 strategy as a part of the Italian Smartainability project, initiatives and projects related to the use of RES presented at the exhibitions inside the national pavilions, as well as overviews of Expo 2017 Astana and Expo 2020 Dubai in the field of renewable energy.