The crisis intensified in late May 2026 when a failure on the 275-kilovolt (kV) Muara Bungo-Sungai Rumbai transmission line in Jambi caused extensive blackouts across Sumatra. Soon after, rolling outages struck the Java-Madura-Bali grid, the heart of Indonesia’s $1.5 trillion economy. While the Ministry of Energy and Mineral Resources (MEMR) initially attributed these incidents to technical and operational issues, state-owned utility PT Perusahaan Listrik Negara (PLN) has since confirmed that constrained coal supply contributed to the failures. PLN President Director Darmawan Prasodjo stated that the disruptions were linked to technical problems at two large power plants operated by independent power producers (IPPs), which were forced offline and temporarily disconnected from the system.
The immediate consequences have been severe. In Medan, North Sumatra, the blackouts caused critical equipment at the regional water utility PDAM Tirtanadi to fail, triggering a clean water supply crisis. PDAM Tirtanadi President Director Ardian Surbakti reported that the damaged machinery disrupted service for thousands of customers in seven of the city’s 21 districts. Emergency water tanker trucks have been deployed to mitigate the impact, but residents like Jefri Hidayat in Medan Denai district report compounded hardships, relying on stored water and emergency lighting as power remains unstable.
Economic and social ripple effects are widespread. Fabby Tumiwa, CEO of the Institute for Essential Services Reform (IESR), warned that the situation could persist for up to two more weeks. He noted that outages lasting three to five hours have forced micro, small, and medium enterprises (MSMEs) to suspend operations or rely on costly diesel generators. In East Java, market traders in Malang have resorted to flashlights to serve customers, highlighting the direct impact on commercial activities that depend on uninterrupted electricity.
These outages have reignited a contentious debate over Indonesia’s energy mix. Despite global momentum toward renewables, Indonesia’s grid remains heavily reliant on coal. Walhi, an environmental organization, argues that this dependence creates an “energy injustice” where local communities bear the environmental costs while electricity is consumed elsewhere. In Banten, home to the 4,000-megawatt (MW) Suralaya power complex, Walhi points to severe pollution impacts. A 2023 study by the Centre for Research on Energy and Clean Air (CREA) estimated that air pollution from Suralaya alone results in an annual loss of 1,470 lives and health-related damages totaling $1.04 billion. The complex emits over 28 million metric tons of carbon dioxide annually, making it the country’s largest single source of coal-generated emissions, yet approximately 41,000 households in the province still lack adequate electricity access.
Experts suggest that the current centralized model is ill-suited for resilience. Recent reports highlight the potential of distributed energy sources, such as rooftop solar paired with battery energy storage systems (BESS), to insulate households and industries from grid failures. However, Indonesia’s adoption lags significantly behind regional peers. In 2025, Indonesia had installed only 853 MW of rooftop solar capacity, compared to 6.9 gigawatts (GW) in Vietnam, 3.6 GW in Thailand, and 1.8 GW in Malaysia. Structural barriers, including restricted net metering, quota limitations, and high upfront costs, have stifled growth. Analysts urge policy reforms, such as reinstating meaningful net metering and expanding permitting for BESS, to enhance grid reliability and energy security.
As PLN works to restore stability, the incidents underscore a broader challenge: balancing immediate operational reliability with the long-term transition to a more diversified and resilient energy system. The reliance on aging coal plants and constrained fuel supply has left the grid exposed to cascading failures, prompting calls for accelerated infrastructure upgrades and a faster integration of renewable sources.
