Unlocking Indonesia’s Solar Resources for Long-Term Energy Solutions

Country or Region Overview

Country or Region: Indonesia

Capital: Jakarta

Total Population: Approximately 275 million (as of 2025)

Geographical Location: Indonesia is a vast archipelagic country in Southeast Asia, consisting of over 17,000 islands, bordered by the Indian Ocean and Pacific Ocean, and neighboring Malaysia, Papua New Guinea, Timor-Leste, and Australia. Its geographical diversity makes solar development both promising and challenging.

Solar resource map copyright at 2021 Solargis. Licensed under the Creative Commons Attribution license (CC BY-SA 4.0). This is a solar resource map from Solargis. For a higher resolution map, please visit and download.

Solar Irradiation Data in Indonesia

Indonesia benefits from year-round solar exposure due to its equatorial location. Average solar irradiation across the islands ranges from 4.0 kWh/m²/day to 5.5 kWh/m²/day, making it suitable for widespread solar energy applications.

Key Solar Irradiation Data:

Annual Solar Irradiation: Around 4.5 to 5.0 kWh/m²/day on average
High Irradiation Regions: Java, Bali, East Nusa Tenggara, and southern Sumatra
Peak Irradiation: Up to 5.5 kWh/m²/day in dry season months

Although cloud cover and humidity are present, especially in tropical rainforest zones, solar remains a reliable and scalable energy option for Indonesia’s growing needs.

If you need to learn more solar power potential in Indonesia, please feel free to contact Solarvance for more details.

Temperature Factors in Indonesia

Average Annual Temperature: Typically ranges from 25°C to 32°C across most islands
Impact on Solar Panels: High temperatures may slightly lower efficiency, but are offset by consistent sunlight hours

Recommendation: Choose heat-tolerant, tropical-grade PV modules with good ventilation clearance to manage system performance in hot and humid areas.

Energy Demand and Grid Situation in Indonesia

National Energy Demand: Indonesia’s energy demand is rising quickly, driven by population growth, industrialization, and rural electrification
Grid Infrastructure: Java and Bali have strong grid coverage, while many outer islands lack reliable access, creating high demand for decentralized solar systems
Opportunities from Global Events: As a G20 member and host of recent climate discussions, Indonesia is under pressure to increase its share of renewables

Preferred System Type in Indonesia

Grid-Connected Systems: Popular in urban and commercial areas, especially in Java, Bali, and Sumatra
Off-Grid Systems: Crucial for outer islands and remote villages, where grid extension is difficult
Hybrid Systems: Growing in popularity for resorts, hospitals, and government buildings, combining solar with batteries and backup generators

Dust and Sand Factor in Indonesia

Dust and Sandstorms: Not a significant concern; however, urban pollution and ash from volcanic activity (in certain regions) may affect panels
Recommendation: Regular panel cleaning and tilted mounting can help manage any buildup from air particles or volcanic dust

Humidity and Rainfall (Humidity Factor) in Indonesia

Humidity Levels: High year-round, especially in rainforest areas, often exceeding 80–90%
Impact on Solar Panels: Moisture ingress and corrosion risks are real without proper component sealing
Recommendation: Install IP65/IP67 rated components, and use corrosion-resistant panel frames and mounts for durability

Ocean (Salt Corrosion Factor) in Indonesia

Saltwater Corrosion: Many installations near coastal areas or on islands are exposed to salt spray, especially in Bali, Sulawesi, and Maluku
Recommendation: Use marine-grade mounting systems, anodized aluminum, and protective coatings to prevent corrosion

Government Policies and Solar Incentives in Indonesia

Indonesia’s government is accelerating solar energy adoption through various initiatives:

RUEN (National Energy Policy): Targets 23% renewables by 2025, with solar playing a key role
Net Metering Regulation: Allows users to export unused electricity back to the grid (currently with a 100% export rate reinstated in 2023)
PLTS (Pembangkit Listrik Tenaga Surya): Government is building large-scale solar farms, especially in eastern Indonesia
International Collaboration: Projects with ADB, UNDP, and private partners are expanding off-grid and mini-grid solar access

ROI on Solar Systems in Indonesia

ROI Period: Most solar systems in Indonesia offer payback within 5 to 8 years, with faster ROI in areas with high tariffs or diesel substitution
Long-Term Savings: Solar adopters can reduce electricity costs by 50–70%, especially with self-consumption and net metering

Conclusion on Solar Power in Indonesia

Indonesia’s solar story is still in its early chapters — yet the potential is vast and unmistakable. As a nation made up of thousands of islands, solar energy offers not just a cleaner alternative, but a practical, decentralized path to energy equity. From powering off-grid villages in Papua to reducing grid load in urban Jakarta, solar can meet the moment.

But success hinges on one thing: implementation at scale. The future lies in smarter policies, better grid planning, and collaboration between government, communities, and solution providers.

At Solarvance, we believe solar in Indonesia isn’t just a market — it’s a mission. We’re here to design solutions that work across islands, climates, and use cases — making clean, reliable power accessible everywhere.

Let’s connect and bring solar to where it matters most — your roof, your community, your island.

Choose Solarvance for Your Solar System

Contact us today to explore customized solar solutions for your needs, whether you’re interested in grid-connected, off-grid, or hybrid solar systems. Our team at Solarvance is here to guide you through every step of the process, from system design to installation and maintenance.