Coal-fired power plants face increasing pressure to improve efficiency while reducing environmental impacts. This study evaluates the integration of Lean Thinking and Life Cycle Assessment (LCA) to optimize operational and environmental performance in a 25 MW coal-fired power plant in Indonesia. A quantitative case study comparing conditions before and after implementation was conducted using operational data from 2021 to 2024. Lean interventions included variable frequency drive (VFD) installation and combustion optimization. Environmental impacts were assessed using OpenLCA with the TRACI 2.1 method, considering system boundaries from coal handling to electricity generation (functional unit: 1 kWh). Results show that auxiliary power consumption decreased from 14.75% to 11.75%, boiler efficiency increased by 3.75%, and coal consumption per kWh decreased by 3.48%, resulting in a 10.12% reduction in Global Warming Potential. However, acidification and particulate impacts slightly increased, indicating trade-offs. This study provides empirical evidence of an integrated Lean-LCA approach to simultaneously evaluate efficiency and environmental performance.
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