Saturday, 11-04-26
Indonesia 100GW Solar Program and the Shift to De-Dieselization
Indonesia is advancing a 100-gigawatt (GW) solar plus battery energy storage system (BESS) program, marking a major shift in its national electricity strategy. The plan begins with an initial 13GW rollout designed to replace diesel power plants across remote regions.
The program is positioned as a structural transformation in how electricity is generated across Indonesia’s vast archipelago of more than 17,000 islands. It aims to move away from diesel-based electrification toward renewable energy systems supported by battery storage.
According to the article, this transition reflects a broader effort to improve energy security while reducing dependence on imported fuels and subsidy-heavy electricity generation systems.
Why Diesel Still Dominates Indonesia’s Remote Energy System
For decades, diesel has been the backbone of electricity supply in remote and isolated areas of Indonesia. This is largely due to the difficulty and high cost of building transmission infrastructure across thousands of islands.
The article notes that in 2024, Indonesia operated thousands of diesel units contributing around 5.8GW of installed power capacity. The national utility, PT Perusahaan Listrik Negara (PLN), owns approximately 3GW of this capacity, producing more than 7,000 GWh of electricity annually.
This system requires around 2.7 billion liters of High-Speed Diesel (HSD) each year, equivalent to approximately 17 million barrels of imported fuel, costing more than USD2 billion annually.
As a result, Indonesia remains exposed to global oil price fluctuations and supply risks, particularly during periods of geopolitical instability affecting fuel markets.
Solar Plus BESS as a Cost-Competitive Energy Solution
The article highlights that solar plus BESS offers a significantly cheaper alternative to diesel-based generation.
Utility-scale solar in Indonesia is priced at around USD0.04–0.06 per kWh, while solar plus battery storage systems are estimated by the Institute for Energy Economics and Financial Analysis (IEEFA) at USD0.08–0.20 per kWh.
In comparison, diesel generation costs are substantially higher, ranging from USD0.29–0.40 per kWh, and can reach up to USD0.55–0.65 per kWh during periods of market volatility, as seen in 2023.
Supporting this shift, BloombergNEF reports that the global cost of a four-hour battery system declined by 27% year-on-year to USD78/MWh (USD0.078/kWh) in 2025, strengthening the economic viability of solar-plus-storage systems.
The article also notes that solar plus BESS allows Indonesia to replace fuel logistics with locally generated and stored energy, improving reliability in remote grids.
Economic Savings From Replacing Diesel With Renewable Energy
Replacing diesel with solar plus BESS could generate substantial economic savings for Indonesia.
The article estimates that diesel dependence results in significant financial burden due to both fuel imports and subsidies. Indonesia currently spends more than USD2 billion annually on diesel imports alone.
According to IEEFA estimates cited in the article, transitioning to solar plus BESS could deliver:
- Around USD2 billion in annual savings from avoided fuel imports
- Approximately USD1.5–2 billion in annual subsidy reductions
These savings are significant when compared to the USD11 billion in subsidies and compensation paid to PLN in 2024, meaning diesel replacement could reduce a notable share of the national subsidy burden.
The article also highlights that Indonesia’s solar potential is substantial. The Institute for Essential Services Reform (IESR) estimates 7.7 terawatts (TW) of technical solar potential, with around 166GW considered economically viable for utility-scale development.
Policy, Financing, and Land Barriers to Implementation
Despite strong economic arguments, implementation of Indonesia’s 100GW solar program remains slow.
The article explains that PLN launched a de-dieselization program in 2022 to convert approximately 5,200 diesel power plants in remote areas. However, progress has been limited and no power purchase agreements (PPAs) have been signed so far.
Regulatory uncertainty remains a key barrier. Although Presidential Regulation PR 112/2022 sets procurement timelines of under 180 days, delays continue in execution. Meanwhile, MEMR Regulation No. 19 of 2025 allows hybrid power plants, but tariff structures are still under discussion.
Financing challenges also affect project viability. Rising interest rates, reflected in SOFR increasing from 3% to 5.4% between 2023 and 2024, have pushed commercial borrowing costs to 7.5–8.5%, reducing project attractiveness, particularly in small island systems with limited economies of scale.
Land acquisition is another major challenge. The article highlights inconsistent implementation of land regulations, which slows down renewable energy development and discourages private investment. Clearer frameworks and more consistent enforcement are identified as necessary conditions to accelerate deployment.
This article is a summary of two original articles. The full versions can be read at the following links:
PHOTO: FREEPIK
This article was created with AI assistance.
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