Usep Rahmat, Sumardin and Sudianto 2026. The Influence of Career Development, Job Promotion, Employee Loyalty and Work Environment on Employee Performance at PT. Brigh PLN Batam. International Journal of Economics, Business and Innovation Research. 5, 05 (Sep. 2026), 5395-5415. DOI:https://doi.org/10.63922/ijebir.v5i05.6612.