The role of local and National authorities is changing to constantly adapt to new situations. Public authorities have extensive responsibilities to anticipate and react fast to unforeseen events: natural disasters, geopolitical uncertainties, and health crisis. Cities and public services are also impacted by growing macro trends such as the race to net zero, the impact of deglobalization and accelerating urbanization. This constantly evolving context requires from local and national Public Services more agility and informed decisions. We will present how digital Twin support Public authorities to anticipate unpredictable events, insure activity continuity and plan efficiently.