Managing More Than 900 Million Tons of Coal Reserves, with Production Reaching 57.2 Million Tons in 2025
ICN News, Jakarta — The name of PT Dian Swastatika Sentosa Tbk (DSSA) is attracting increasing attention in Indonesia’s mining industry. As part of the Sinar Mas business group, DSSA not only operates a large-scale coal mining business, but is also accelerating its transformation toward renewable energy, digital infrastructure, and technology.
Based on its 2025 Annual Report, DSSA operates through four main business pillars: mining, new and renewable energy, digital infrastructure and technology, and chemicals.
However, the mining sector remains one of DSSA’s greatest strengths.
In 2025, DSSA recorded coal production of 57.2 million tons, an increase of 7.7% compared with the previous year. Coal sales reached 56.7 million tons, up 4.4% from 2024.
Equally significant is the company’s resource base. As of December 31, 2025, DSSA’s mining assets had more than 900 million tons of proved and probable thermal coal reserves.
Mining Assets Across Four Regions
DSSA conducts its mining operations through PT Golden Energy Mines Tbk (GEMS) and its subsidiaries, as well as PT DSSE Energi Mas Utama and its subsidiaries.
These mining assets are spread across several strategic regions, including South Sumatra, Jambi, Central Kalimantan, and South Kalimantan.
Through GEMS, the group has five major mining clusters covering a total area of approximately 66,204 hectares, with total reserves of around 844 million tons as of December 31, 2025.
One of its most important assets is PT Borneo Indobara (BIB) in Tanah Bumbu, South Kalimantan. BIB controls a concession area of approximately 24,100 hectares and is one of the largest coal mining operations within the group.
In addition to BIB, GEMS’ mining portfolio includes PT Kuansing Inti Makmur (KIM) and its subsidiaries in Jambi, PT Barasentosa Lestari (BSL) in South Sumatra, PT Trisula Kencana Sakti (TKS) in Central Kalimantan, as well as the EMS group in South Sumatra and West Sumatra.
With this portfolio, DSSA has established a strong position in Indonesia’s coal value chain.
BIB: A Strategic Asset
Among these mining assets, Borneo Indobara holds a strategic position within DSSA.
DSSA’s 2025 Annual Report records DSSA’s effective ownership in BIB at approximately 51% through related entities. BIB is also one of the key contributors to the mining activities of the GEMS group.
Interestingly, DSSA is not only focused on increasing production. The company has begun transforming its mining operations through digitalization and the electrification of mining equipment.
As part of its latest development, BIB has implemented a mining equipment electrification program and, as of May 2026, had mobilized 176 electric and hybrid vehicles.
The initiative forms part of DSSA’s strategy toward achieving net-zero emissions in the 2028–2029 period.
From Coal To Renewable Energy
DSSA’s transformation is increasingly visible through its expansion into renewable energy.
In 2026, the company strengthened its renewable energy portfolio through the development of an integrated solar cell and module manufacturing plant in Kendal, Central Java, with an annual production capacity of 1 GW.
DSSA has also entered into a strategic partnership with PT FirstGen Geothermal Indonesia, a subsidiary of First Gen Corporation of the Philippines, to develop geothermal assets in Indonesia, with an initial potential capacity of up to 440 MW across six areas.
These initiatives demonstrate that DSSA is beginning to build a new balance between its long-established coal business and clean energy businesses, which are expected to become increasingly important in the future.
Digital Infrastructure As A New Growth Engine
DSSA’s transformation does not stop at energy.
The company is also aggressively expanding its digital infrastructure and technology business.
In 2025, revenue from the digital infrastructure and technology segment grew approximately 47% year-on-year. Homepass increased by 64.1% to 10.5 million, while the number of customers reached 1.9 million, representing a 102.9% increase.
In April 2026, the merger of PT Eka Mas Republik (MyRepublic) and PT Mora Telematika Indonesia Tbk created MoraRepublic, further strengthening DSSA’s position in Indonesia’s digital sector.
The merged entity operates a fiber-optic network spanning more than 116,000 kilometers, positioning MoraRepublic among the major players in Indonesia’s fixed broadband market.
In the data center sector, DSSA and KIRA SG One Pte. Ltd. are also accelerating the development of the Metro Data Center (SMX01) in Jakarta’s CBD, with an IT Load capacity of 18 MW and commercial operation targeted for the fourth quarter of 2026.
Revenue Declined, But Diversification Accelerated
Interestingly, this transformation is taking place while the coal industry faces global price normalization.
DSSA recorded consolidated revenue of approximately US$2.791 billion in 2025, down 7.5% from the previous year.
Nevertheless, the company maintained strong mining operations while increasing the contribution of its non-mining businesses.
The contribution of digital infrastructure and technology to consolidated revenue increased from 4.8% in 2024 to 7.6% in 2025.
This indicates that DSSA is building a more diversified business structure.
DSSA Is No Longer Just About Coal
For Indonesia’s mining industry, DSSA’s development is worth watching closely.
The company still operates a large-scale coal business, with annual production reaching tens of millions of tons and coal reserves exceeding 900 million tons. At the same time, its long-term strategy is expanding into renewable energy, mining digitalization, data centers, digital connectivity, and technology.
DSSA can therefore be viewed as an example of a mining company seeking to build a new business model amid major changes in the global energy industry.
For the coal sector, the challenge is no longer simply how to increase production and efficiency, but also how mining companies can prepare new sources of growth as the global energy transition accelerates.
And DSSA appears to have already begun taking steps in that direction.
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