The electronics manufacturing sector has significantly contributed to global greenhouse gas emissions, increasing the urgency for effective carbon footprint management. A traditional carbon accounting system (CAS) focuses primarily on compliance, relying on retrospective electricity billing data. However, CAS lacks equipment-level granularity, predictive capabilities, and real-time responsiveness. In this study, we integrated CAS with the energy management system (EMS) based on design science research methodology (DSRM). The CAS-EMS system addresses three key limitations: (1) insufficient granularity in ISO 14064-1 Category 2 emissions data, (2) the reactive nature of emission monitoring, and (3) data silos between CAS and EMS. The CAS-EMS system enables real-time, equipment-level carbon emission visibility and leverages advanced predictive analytics for proactive emission management. In electronics manufacturing, the system demonstrated a significant increase in data granularity by 91.7% and a reduction in anomaly response time by 93.8%. Such an enhanced decision support of the system enables targeted decarbonization strategies, leading to measurable economic and environmental benefits. The system underscores the transformative potential of integrated carbon and energy management as a scalable model for strategic decarbonization across various industries.