Europe’s energy and climate transition has reached a defining moment. Sustainability and affordability, along with resource and energy independence, have become more important than ever, due to both environmental concerns and geopolitical instability. The priority now is to translate Europe’s collective ambition and field-tested insights into tangible, large-scale delivery across all Member States. This requires not only strong policies but effective mechanisms that can connect innovation, investment and local action. Cities are where this transformation takes shape.