As the biggest integrated steel mill in Taiwan with around ten million tons crude steel production capacity, China Steel (CSC) never hesitates to promote and implemented the best available technologies in district energy integration, waste heat and energy recovery, industrial wastewater reclamations in-plant and utilized reclaimed municipal wastewater from Kaohsiung city and has already achieved profound performance. As a result, CSC contributes not only for the resilience of Kaohsiung but also the tri-wins for the environment, society and economics to attain sustainable future for the earth.