Monday, 2 November 2026

A preliminary report from the National System Operator (NSO) traced Sri Lanka's October 17 islandwide blackout to the abrupt loss of 187 MW from the first generating unit at the Norochcholai Lakvijaya Power Plant, filed with the Public Utilities Commission of Sri Lanka (PUCSL).

That unit dropped off in roughly 450 milliseconds, pulling the national frequency down to 48.75 hertz, the NSO said. From there the whole system went dark in 4.1 seconds.

Protective controls could not hold the grid together. All five under-frequency load-shedding stages fired, yet the system still failed. They shed 449.2 MW, about 39.6% of the 1,135 MW running just before the outage.

The report names the trigger but stops short of the cause. Investigators have not yet determined why the Norochcholai unit disconnected.

Russian strikes on Ukrainian energy infrastructure on Oct. 30 left roughly 280,000 families without electricity across several regions, President Volodymyr Zelensky said on Saturday, Oct. 31.

The disruptions hit multiple regions at once, according to Zelensky.

DTEK said the fresh strikes compounded damage from earlier shelling, worsening the situation across the power system.