Climate change is a critical problem to which we are paying attention. "Central Retail" has a project to install solar cells on the roof since it affects both the commercial sector and everyone's daily lives. To use the sunlight to generate as a clean energy which can reduce electricity energy expenditures and greenhouse gas emissions, we have installed the solar systems on the roofs of Robinson Department Store, Thai Watsadu in Thailand, and Big C / GO! with a total of 25 branches across Vietnam. We were able to use 15,689 Mhw of renewable energy in 2020, reduced greenhouse gas emissions by 35,011 tons CO2e.