In the contemporary context of the polycrisis, ways and criteria for sustainable urban transformation are discussed that shift the needle of ecological transition from building to city, towards energy self-sufficiency and social self-determination. Alternative forms of management, containment and production of clean and accessible energy from renewable sources are explored that have feedback in terms of process, design and social innovation. The paper aims to highlight the active and adaptive dimensions of technological design in its ability to support and promote behaviour favouring sustainable environmental transition. [ABSTRACT FROM AUTHOR]