For many years, coal has been a primary contributor to Indonesia’s national energy mix. Indonesia is known as one of the countries with abundant coal reserves, particularly in Kalimantan and Sumatra.
However, coal is a non-renewable energy source. With continuous utilization, the key question is: how large are Indonesia’s coal reserves today, and how are they distributed? Discover the latest data in this article.
Latest Data on Indonesia’s Coal Reserves
According to the 2025 Indonesia Mineral and Coal Resources and Reserves Balance Sheet, the figures show:
- Coal resources: 97,960.76 million tons
- Coal reserves: 31,955.50 million tons
It is important to understand that resources refer to the total estimated deposits available in nature, while reserves are the portion of those resources that have been technically and economically verified for extraction.
The breakdown of coal reserves is as follows:
|
Reserve Category |
Amount (Million Tons) |
| Probable Reserves |
14,418.87 |
| Proven Reserves |
17,536.63 |
| Total National Reserves |
31,955.50 |
Beyond volume, the quality of Indonesia’s coal varies significantly and is classified based on calorific value.
Low-calorie coal is generally used for coal-fired power plants (CFPPs), particularly mine-mouth power plants, due to its abundant availability and more efficient logistics costs.
Meanwhile, medium- to high-calorie coal is more attractive to export markets and industrial sectors because it generates higher heat energy.
Read More: The Benefits of Coal and Its Associated Risks
Which Regions Are the Largest Coal Producers in Indonesia?
Based on the latest reports, the following regions are among Indonesia’s largest coal producers:
Kalimantan as the National Production Hub
Kalimantan Island serves as the backbone of Indonesia’s coal production. East Kalimantan is recorded as the largest production contributor, supported by rapidly developing port infrastructure and efficient river transportation networks for domestic and export shipments.
In addition to East Kalimantan, South Kalimantan, and Central Kalimantan also hold significant reserves and production activities.
The combination of abundant resources and strong infrastructure support makes Kalimantan the main center of coal mining activities and a key driver of the national mineral economy.
Sumatra as a Strategic Production Region
Sumatra ranks second after Kalimantan as a strategic coal production region in Indonesia. South Sumatra is the leading contributor, followed by Jambi and Bengkulu, which also maintain significant mining activities, albeit on a smaller scale.
Sumatra plays a vital role not only in supporting exports through ports on both the eastern and western coasts but also in meeting domestic energy demand.
Other Provinces with Coal Reserves
Although national coal production is dominated by Kalimantan and Sumatra, data from the Ministry of Energy and Mineral Resources shows 1,660 mining sites spread across 23 provinces.
Regions such as Sulawesi and Papua are also recorded as having resource potential, though on a more limited scale.
These areas are indicated to have reserves that can be further developed; however, their contribution to national production remains relatively small compared to Kalimantan and Sumatra.
Meanwhile, on Java Island, coal reserves are found in limited quantities and do not serve as a significant production base, but they are still recorded as part of Indonesia’s national mineral resources.
Read More: Advantages and Disadvantages of Coal as an Energy Source
What Are the Risks of Dependence on Coal?
Dependence on coal carries various risks. One of the primary risks is economic vulnerability, particularly related to fluctuations in global commodity prices.
Countries that heavily depend on coal exports or imports are exposed to market volatility, which can disrupt national revenue and economic stability.
Additionally, international pressure to transition toward cleaner energy introduces the risk of stranded assets, meaning that abundant coal reserves may lose their economic value if carbon regulations tighten or carbon taxes are implemented.
Heavy reliance on this resource makes long-term investment in the coal sector increasingly risky, especially as the global decarbonization trend accelerates.
From an energy security perspective, high dependence on coal can also disrupt national electricity supply stability. If supply disruptions occur, due to geopolitical conflicts, import restrictions, or mining operational issues, energy availability may be threatened, affecting both industry and society.
Read More: Is LNG an Ideal Replacement for Coal?
Why Has Energy Transition Become a Strategic Necessity for Industry?
Energy transition is no longer merely an environmental issue; it has become a strategic necessity for business sustainability. The growing demand for ESG (Environmental, Social, and Governance) implementation and sustainability reporting requires companies to demonstrate their commitment to reducing carbon footprints.
Indonesia’s net-zero emission roadmap provides clear guidance that the industrial sector must begin shifting toward more environmentally friendly energy sources to support national targets.
Beyond financial pressure, global supply chains increasingly demand higher decarbonization standards. Products manufactured using high-carbon energy sources like coal are beginning to face trade barriers in international markets.
Therefore, adopting cleaner energy is key for Indonesian manufacturing industries to remain competitive globally.
Read More: Innovation of Virtual Pipeline to Deliver LNG
What Is LNG’s Role as a Cleaner Energy Solution?
LNG (Liquefied Natural Gas) is a fossil fuel that burns cleaner than coal and petroleum, making it suitable as a transitional energy solution.
The use of LNG can reduce CO₂ emissions by up to 40–50% while significantly lowering sulfur oxides (SOx), nitrogen oxides (NOx), and particulate matter emissions. Therefore, LNG is an ideal option for industries operating in densely populated areas or under strict environmental regulations.
Beyond environmental benefits, LNG offers supply stability and distribution flexibility. Infrastructure such as regasification terminals and small-scale LNG technology allows liquefied natural gas to reach remote industrial areas. In the maritime sector, LNG is also used as a cleaner marine fuel (bunkering).
LNG serves as a strategic bridge for heavy industries requiring high heat intensity. With ongoing infrastructure development, LNG can meet current energy demands while providing a realistic option for industries seeking to remain both competitive and sustainable.
References:
- Kementerian ESDM. Accessed in 2026. Neraca Sumber Daya dan Cadangan Mineral, Batubara, dan Panas Bumi Indonesia Tahun 2025
- EIA. Accessed in 2026. Coal Explained
- IEA. Accessed in 2026. New IEA Report Assesses Emissions from LNG Supply and Maps Opportunities to Reduce Them
