Current energy system models have problems like supply-demand mismatch and an unreasonable energy structure. Clean energy is not economically competitive enough compared to fossil energy, which affects the sustainability and transformation of energy systems. This study introduces Renewable Energy Technology and uses Multi-Objective Programming to optimize the installed capacity. This reduces the overall cost of the energy system by improving the conversion efficiency and installed capacity of renewable energy. The proposed model reduces wastewater emissions by 89.64%, which is much higher than the other two models. It also has higher proportions of reclaimed water and waste treatment. The data show that the proposed model improves energy supply stability, is more economically competitive, and provides insights for sustainable energy system development.