An International Energy Agency (IEA) report estimates total investment needs for Indonesia's battery energy storage system pipeline at nearly $5 billion between 2026 and 2034, with commercial debt covering half of that amount. PT Perusahaan Listrik Negara (PLN), an Indonesia-based state-owned electricity utility, is largely responsible for the roughly 6 GW standalone BESS pipeline. Nearly 90% of that capacity is planned for Sumatra and Java, Madura and Bali, with nearly 0.6 GW in Kalimantan for the new capital Nusantara in the first half of the RUPTL.
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PT Perusahaan Listrik Negara (PLN), Indonesia’s state-owned electricity utility, is largely tasked with developing around 6 GW of standalone BESS under the Accelerated Renewable Energy Development (ARED) scenario of the Electricity Supply Business Plan (RUPTL) 2025–2034. The plan also includes about 3.6 GW of hybrid solar-plus-storage capacity, which is generally allocated to IPPs, including projects in Sulawesi and Nusa Tenggara.
The International Energy Agency (IEA) estimates that completing the BESS pipeline will require around $5 billion of investment between 2026 and 2034. Commercial financiers are expected to provide about $2.5 billion, equivalent to half of total investment needs, while public finance is estimated at $2.3 billion. International public finance from multilateral climate funds, export credit agencies, multilateral development banks, DFIs and bilateral lenders is estimated at $275 million. Although relatively small in scale, concessional and other favourable financing terms are expected to help attract additional private investment.
Electricity demand in Indonesia is projected to rise sharply over the next decade, with residential space cooling among the main drivers as incomes and economic activity increase. PLN’s RUPTL 2025–2034 aims to install 69 GW of power capacity, including 6 GW of standalone storage and 3.6 GW of hybrid systems. Low-emissions technologies account for less than 10% of PLN’s installed capacity in 2025 but represent three-fifths of planned additions under the RUPTL.
The main barrier to BESS deployment in Indonesia is a limited pipeline of bankable projects rather than a shortage of financing. Domestic and international capital markets have shown interest, but uncertainty over long-term cash flows, particularly for standalone assets, remains a key challenge because BESS-specific regulations are still lacking. Regulatory frameworks for hybrid installations have been introduced through MEMR Regulations 5/2025 and 19/2025 and Presidential Regulation 112/2022, allowing IPPs to recover generation and storage costs through PPAs with PLN. Parallel regulations for standalone BESS are still required.
Financing requirements vary by region and project type. During the first half of the RUPTL, one-third of BESS spending is concentrated in Kalimantan to support nearly 0.6 GW of standalone storage for Nusantara. In the second half, Java, Madura and Bali are expected to account for three-fifths of spending as PLN develops nearly 3.5 GW of storage to address rising electricity demand.
The IEA identifies six priorities for accelerating BESS deployment: clarifying remuneration structures and technical requirements; prioritising long-term system benefits for early standalone projects; directing public financing towards the development and construction phases of hybrid projects; establishing pilot projects; tailoring concessional financing and technical assistance to regional challenges; and maintaining early engagement among government, developers and financiers.
For standalone BESS, capacity payments of around $111/kW to $297/kW per year could provide the returns sought by commercial investors. Adding battery storage to solar PV projects could increase PPA prices by about $8/MWh to $18/MWh across the main RUPTL regions.
Early standalone BESS projects may not be profitable during their first years of operation, but they are expected to provide long-term grid flexibility as Indonesia manages rising electricity demand and renewable energy deployment. As the market develops, commercial financing will be important for replicating successful projects and reducing the fiscal burden on the state.