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Indonesia is experiencing a surge in 'captive' coal-fired power plants—industrial plants not connected to the national grid—which are growing significantly faster than on-grid capacity. Driven largely by nickel smelting in Sulawesi and North Maluku, total operational and prospective captive capacity is projected to reach 31 GW, nearly tripling 2023 levels. The report highlights critical transparency gaps in government and JETP data, regulatory loopholes for National Strategic Projects (PSN), and severe long-term economic and health costs, including an estimated 27,000 additional deaths and USD 20 billion in cumulative economic burdens if these plants are not phased out.