Sumatra blackout spurs acceleration of transmission network development

The power outage in Sumatra on May 22, 2026, has prompted calls to strengthen the transmission network and provide compensation to customers.

A massive power outage struck several areas in Sumatra and Aceh for more than 24 hours on May 22, 2026. The disruption was triggered by an issue on the 275 kilovolt Muara Bungo–Sungai Rumbai transmission line in Jambi due to bad weather, according to PLN CEO Darmawan Prasodjo.

Public policy observer Agus Pambagio said the blackout serves as momentum to accelerate construction of the 500 kilovolt Extra High Voltage transmission line already included in the latest RUPTL. He noted that land acquisition and cross-regional permitting processes often delay such projects.

Legal practitioner Rahmat Hidayat argued that PLN is obligated to provide compensation under the Consumer Protection Law and the Electricity Law. He questioned the weather excuse as the main cause since BMKG data showed only cloudy to light rain conditions.

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Illustration of restored power system in Sumatra with glowing lights and workers.
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Sumatra electricity system returns to normal

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PT PLN (Persero) completed restoration of the electricity system across Sumatra following a widespread outage on Friday, May 22, 2026.

PLN stated that power outages on 9 June 2026 in Depok, Bogor, Gresik, and parts of Madura were not caused by electricity shortages.

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Rotating blackouts hit Luzon and the Visayas this week, revealing heavy reliance on a few major power plants and transmission lines. The National Grid Corp. of the Philippines raised red and yellow alerts on May 13 and 14 amid insufficient supply. Analysts from the Institute for Climate and Sustainable Cities warned that disruptions in shared facilities can cascade into wider shortages.

The Visayas power grid could face supply shortfalls for one to two years, the Department of Energy said on June 1.

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