This study aims to analyze the influence of the work environment and work motivation on employee performance, with work ability as a mediating variable, at PT Pertamina Patra Niaga Integrated Terminal Tenau Kupang. Employee performance is a strategic factor in ensuring the effectiveness and sustainability of an organization, especially in the energy sector, which demands high operational and work safety standards. This study uses a quantitative, explanatory research design. The research population included all 71 contract employees of PT Pertamina Patra Niaga Integrated Terminal Tenau Kupang, so the sampling technique used was a census. Data collection was conducted through a structured questionnaire that had been tested for validity and reliability. Data analysis used path analysis in SPSS to test the direct and indirect effects among variables. The results show that the work environment and work motivation affect employee work ability. That work ability helps explain the relationship between the work environment and employee performance. These findings indicate that improving employee performance is influenced not only by external factors such as the work environment and motivation but also by employees' work ability. Organizations need to integrate policies to improve the work environment and strengthen motivation with ongoing work ability development programs. This study is expected to contribute theoretically to the development of human resource management and serve as a practical reference for policy-making to improve employee performance in the energy sector.