Jakarta, INTI - Indonesia’s data center sector is facing growing electricity infrastructure challenges as projected demand for high-voltage connections exceeds the capacity available across the Java-Madura-Bali power grid. The grid can currently accommodate only 3,207 megawatts (MW) of the more than 12,000 MW in projected data center demand for 2026–2030, prompting state-owned electricity company PT Perusahaan Listrik Negara (Persero), or PLN, to accelerate grid upgrades and connection projects.

The challenge stems from a widening gap between developers’ construction schedules and the time required to build supporting electricity infrastructure. While data center developers seek connections within approximately 18 months, constructing a conventional substation can take around 24 months, according to Imam Makhfud, PLN’s Vice President of Strategic Planning and Transmission Asset Management, in comments to Asian Power.

To address this mismatch, PLN is considering mobile substations as a temporary solution while accelerating transmission projects beyond those outlined in its 2025–2034 Electricity Supply Business Plan (RUPTL). Planned improvements include capacity upgrades in Tambun, Karawang, Margakarya, and Pasir Ranji.

“Mobile substations are highly effective in bridging the gap between data center electricity requirements and grid construction timelines,” Makhfud said in a written email response. He added that the approach could help PLN avoid losing business opportunities while reducing the risk of stranded assets.

Power Grid Constraints Threaten Data Center Expansion

Electricity infrastructure is already under pressure in several major data center locations. Substations in Deltamas, Cibatu, and Cirata are projected to reach or exceed 90% loading in 2026 and 2027 under scenarios involving the outage of a major component.

PLN has 49.2 gigawatts (GW) of generation capacity across the Java-Madura-Bali system and maintains a reserve margin of approximately 33%–35%, Makhfud said.

However, sufficient generation capacity does not automatically translate into faster electricity connections. Expanding transmission lines and substations remains essential to deliver power to concentrated data center clusters, particularly as developers seek increasingly large and reliable electricity supplies.

PLN therefore requires developers to commit to minimum electricity consumption levels under its standard power purchase agreements to reduce the risk of unused capacity. The company also evaluates projects before committing infrastructure investment, according to Makhfud.

He warned that delayed coordination or substantial changes in electricity requirements could result in redesigns, connection delays, additional capital expenditure, and mismatches between installed capacity and actual demand.

To manage these risks, PLN plans to map demand by location, phase capacity expansion according to projected loads, and align connection schedules with available grid capacity, said Nayusrizal, PLN’s Executive Vice President of Retail and Commerce.

Data center customers also require dedicated connection infrastructure. Renewable electricity, he explained, is delivered through transmission networks and substations before reaching facilities through specialized connections.

Indonesia’s Data Center Market Attracts Global Investment

Despite infrastructure constraints, Indonesia continues to attract investment in data center facilities and computing capacity as demand for cloud services and artificial intelligence (AI) infrastructure grows.

The country has approximately 637 MW of operational data center capacity serving an economy with a population of around 285 million, according to Jason Ong, a director at strategy consulting firm YCP Holdings (Global) Ltd.

Major international technology companies, including Microsoft Corp., Google LLC, Amazon Web Services, Inc., and Oracle Corporation, operate cloud regions in Indonesia. Meanwhile, CoreWeave, Inc. has announced plans for 360 MW of capacity, while a US$5 billion AI campus backed by Chinese investors is planned for Batam.

According to YCP, citing a May 2025 report by UK-based energy think tank Ember Energy Research CIC, Indonesia’s data center electricity consumption is projected to quadruple to approximately 26 terawatt-hours (TWh) by 2030.

This projected growth highlights the scale of the infrastructure challenge facing the country as investment in digital services and AI computing accelerates.

Ong noted that foreign investors primarily finance computing capacity and data center facilities rather than electricity generation, leaving the responsibility for securing sufficient power dependent on the existing electricity market and infrastructure arrangements.

Renewable Energy Expansion and Power Supply Agreements

PLN’s 2025–2034 RUPTL allocates approximately 49 GW, or 73% of planned additional generation capacity, to independent power producers (IPPs). Of this amount, 42.6 GW is expected to come from renewable energy sources.

The expansion is intended to support future electricity demand while advancing Indonesia’s energy transition. Nevertheless, renewable generation capacity must be supported by adequate transmission infrastructure and reliable connections to meet the operational requirements of data centers.

PLN has allocated more than 1 gigavolt-ampere (GVA) of capacity each to data center operators Big Data Exchange (BDx) and Digital Edge (Singapore) Holdings Pte. Ltd. in the Greater Jakarta area. The company has also signed a 450 MW power supply agreement with DayOne Data Centers Ltd. for its development in Batam.

According to Ong, these investors purchase electricity from PLN rather than building their own power plants.

The arrangements illustrate how data center expansion depends not only on investment in facilities and computing equipment but also on PLN’s ability to coordinate electricity supply, grid expansion, and connection schedules.

Regulatory Uncertainty Adds to Infrastructure Challenges

Indonesia’s electricity market structure presents additional challenges for data center operators seeking reliable and potentially renewable power supplies.

Ong pointed to the country’s single-buyer electricity market, regulated tariffs, limited direct corporate power purchase agreements, and the lack of a finalized framework for third-party access to transmission networks. These factors make it difficult for data center operators to contract directly with independent electricity producers.

Regulatory uncertainty surrounding the data center sector and investment incentives adds another layer of complexity. According to Ong, Indonesia’s data center regulations remain in draft form, while the government is redesigning its tax holiday framework to accommodate the global minimum tax. A replacement framework had not been published at the time of his comments.

These uncertainties may complicate investment planning, particularly for projects that require substantial capital commitments and long-term visibility over electricity costs, infrastructure availability, and regulatory requirements.

Indonesia’s Renewable Energy Ambitions Raise New Priorities

Indonesia accelerated its 100-gigawatt-peak (GWp) solar power program in September and revised its 2025–2034 RUPTL to accommodate the initiative.

At the same time, Singapore has conditionally approved plans to import approximately 3.4 GW of electricity from Indonesia. This creates another consideration for the country’s energy planning, as domestic data center developments and electricity exports could compete for access to renewable power.

Balancing these priorities will require coordinated planning across generation, transmission, data center development, and cross-border electricity trade.

“Indonesia is moving fastest on electricity, but lags furthest behind in regulatory certainty,” Ong said.

As Indonesia’s digital infrastructure market continues to expand, the availability of reliable electricity and the speed of grid connections will be critical to sustaining investment. Accelerating substation and transmission upgrades, expanding renewable generation, and establishing clearer regulatory frameworks will help determine whether the country can meet growing data center demand while maintaining its broader energy transition objectives.

Conclusion 

Indonesia’s rapidly growing data center industry faces a critical challenge as electricity demand outpaces available grid connection capacity. Accelerating transmission upgrades, deploying mobile substations, expanding renewable energy, and providing greater regulatory certainty will be essential to attracting investment and supporting the country’s digital economy. Balancing domestic data center demand with renewable energy export ambitions will also play a key role in Indonesia’s long-term digital infrastructure development.

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