This ZEB Talk features the Dalian Tiger Beach Donggou project, a Sino-Swiss zero-emission demonstration project. Swiss experts share how the simulation tool Energy Hub (E-Hub) supports energy system optimization by testing low-carbon solutions by including wastewater heat pumps, rooftop photovoltaics, and system coupling. The session emphasized integrated energy systems and optimization tools as key to reducing fossil fuel use and achieving efficient, cost-effective decarbonization in large-scale urban projects.