Future projects may gradually flow to markets perceived as lower-risk in power uncertainty, such as Malaysia or Thailand, unless reliability improvements are quickly made, experts noted.

The blackout affected not only North Sumatra, but also other provinces inlcuding Aceh, West Sumatra, Riau, Jambi and South Sumatra.

Several regions across the island of Sumatra were plunged into a total blackout on Friday, May 22, 2026.

Future projects may gradually flow to markets perceived as lower-risk in power uncertainty, such as Malaysia or Thailand, unless reliability improvements are quickly made, experts…