The coal production in Indonesia reached 710 million tons in 2024. The combustion of coal produces ±5% of solid pollutants in the form of ash (fly ash and bottom ash). In 2021, the government issued Government Regulation No. 22 of 2021 concerning the Implementation of Environmental Protection and Management (PP 22/2021) and the Minister of Environment and Forestry Regulation No. 6 of 2021, whi…