This study examines the institutional performance of the Banggai Regency General Election Commission as a local electoral management body in Indonesia’s 2024 regional head election. Using Poister’s (2003) organizational performance framework, this research evaluates performance across seven dimensions: output, efficiency, productivity, service quality, effectiveness, cost-effectiveness, and stakeholder satisfaction. Employing a qualitative case study approach, data were collected through in-depth interviews, document analysis, and institutional records, particularly focusing on the occurrence of court-mandated re-voting (Pemungutan Suara Ulang) in two sub-districts. The findings reveal that procedural and administrative weaknesses significantly undermined institutional efficiency and effectiveness, leading to electoral disputes and re-voting decisions by the Constitutional Court. This study contributes to electoral governance literature by demonstrating how performance failures at the local level directly affect democratic legitimacy and public trust. The findings suggest that strengthening institutional capacity, administrative consistency, and internal supervision mechanisms is essential for improving electoral management performance in decentralized democratic systems.