Renewable Energies in the Built Environment

The attention to environmental sustainability and energy has progressively increased in recent years, driven by the global energy crisis and mounting climate change concerns. These fundamental challenges, combined with the COVID-19 pandemic, have transformed the worldwide energy situation, impacting energy security, climate response, and lifestyles (e.g., smart working, home–school, online shopping). Our built environment is undergoing a metamorphosis, driven by the need for sustainable development and energy efficiency. This revolution brings with it an opportunity to reimagine and redefine the way we harness and utilize energy. This situation opens new possibilities for the energy retrofit of buildings, as well as for the adaptive reuse of existing buildings, asking for a conscious use of passive and active systems.