The 2005 Java–Bali Blackout was a power outage across Java and Bali on 18 August 2005, affecting some 100 million people.
[3] A transmission line between Cilegon and Saguling, both in West Java, failed at 10:23 am local time.
[2] The devices protecting the system misoperated, sending incorrect signals to Suralaya Power Station.
PLN, the state-owned electricity company, confirmed that the electricity grid failed at several points throughout Java and the neighbouring island of Bali, causing a supply shortfall of 2,700 MW, roughly half of the original supply.
Meanwhile, President Susilo Bambang Yudhoyono ordered police and the national intelligence agency to assist PLN to trace the cause of the blackouts.