Indonesia’s cumulative solar power capacity is forecast to reach 23.2GW by 2035, according to new figures published by GlobalData, a London-based data analytics and consulting firm.
The report projects that Indonesia will surpass 1GW of installed solar capacity by the end of 2025, reaching 1.5GW. While solar currently ranks as the third-largest renewable energy source in the country—behind geothermal and biopower—it is expected to become Indonesia’s leading renewable source by 2028, when total solar installations are forecast to reach 4.7GW.
By 2030, the country’s cumulative solar capacity is anticipated to hit 9.1GW, before accelerating through the early 2030s to exceed 20GW in 2034 and 23.2GW in 2035.
According to GlobalData, the sharp growth will be driven by the expansion of floating and utility-scale projects, as well as the rollout of rooftop solar programs backed by feed-in mechanisms and updated net-metering regulations.
Indonesia’s total renewable power capacity is expected to reach 38.1GW by 2035, up from 8.4GW in 2024, representing a compound annual growth rate (CAGR) of 14.7% over the period.
Mohammed Ziauddin, power analyst at GlobalData, said Indonesia’s renewables boom is being propelled by frameworks such as the Just Energy Transition Partnership (JETP), which targets 44% renewable electricity by 2030, as well as fiscal and investment incentives.
However, despite this strong growth outlook, Indonesia’s energy system will remain dominated by thermal power through to 2035. Coal-fired capacity is projected to increase from 55.6GW in 2024 to 61.4GW in 2035, supported by existing long-term contracts and state-owned infrastructure. Similarly, gas-fired capacity is expected to rise from 29.1GW to 36GW over the same period, providing flexibility and backup for variable renewable generation.
Ziauddin noted that with Indonesia’s geographically fragmented grid, significant attention will be needed to expand cross-island transmission infrastructure and deploy digital grid systems capable of integrating more renewables.
“Indonesia’s power system is entering a dual-track phase of expansion, scaling renewables while retaining thermal stability,” he said. “With solar PV and onshore wind leading growth—supported by geothermal development and grid modernization—the country is building a more diversified and secure energy mix through 2035 and beyond.”
Indonesia’s National Energy Policy aims for up to 108.7GW of solar capacity by 2060. Earlier in 2025, the government launched an ambitious plan to deploy 100GW of solar, including 80GW of distributed 1MW solar minigrids with storage and 20GW of centralized solar power plants.
