Jakarta, May 23 -- The state-owned electricity company, PT PLN, informed that the mass power outage in Sumatra on Friday (May 22) starting at 6:44 p.m. was caused by bad weather that subsequently impacted parts of the Sumatran electricity system.

"The disruption to the transmission line had a widespread impact on parts of the Sumatran transmission system, resulting in a drop in frequency due to the heavy load on power plants and triggering a domino effect of disruptions in several areas," PLN President Director Darmawan Prasodjo explained in a statement on Saturday.

Since the disruption began, his office had immediately moved to inspect and restore the electricity system.

Within approximately two hours, the disrupted transmission netwo...