Sri Lanka Orders Expert Inquiry After Seven-Hour Islandwide Blackout

Sri Lanka has its power back. What it does not have, a day after the whole island went dark for about seven hours, is an explanation it can trust. That is now the job of a high-powered committee of experts, which the government says it will appoint to find the precise cause of Saturday's nationwide blackout, identify any technical or operational failures, and establish whether the collapse could have been prevented.

The blackout began around midday on Saturday, October 17, when instability in the national transmission network turned into a total system failure, the National System Operator said. Electricity was restored to most parts of the island by Saturday evening, in stages, but not before the failure had reached into water supplies, internet services and mobile networks across the country.

The suspected starting point

Energy Minister Anura Karunathilaka said a breakdown at the Upper Kotmale hydropower station, in the central hill country, was suspected to have triggered the outage. Sources familiar with the power system said a failure at one of the generating units at Upper Kotmale may have contributed, and the government said a failure at a hydropower station had been detected a day earlier. The exact cause has not been officially confirmed, which is the point of the inquiry.

Shortly after the power failed, the system operator asked owners of rooftop solar systems, homes and businesses alike, to disconnect their panels from the grid until further notice. The request was part of the technical work of bringing a dead grid back in a controlled order, and the minister urged solar owners to stay disconnected until the system was balanced and restored.

How a blackout becomes a water problem

The National Water Supply and Drainage Board warned people to use water sparingly, because pumping stations cannot run at full capacity without power, and major water treatment plants temporarily halted operations. Mobile networks congested as people across the island tried to reach family and find information. For several hours on Saturday, Sri Lanka ran on generators, candles and patience.

"Our immediate concern was restoring the power supply," Karunathilaka said. "We will do everything possible to prevent a recurrence of such power outages." He expressed regret for the inconvenience caused to the public.

Why this one worries people more than a normal outage

Sri Lanka has been here before. A comparable nationwide failure hit the island in February 2025, and an inquiry that ends in general language will not settle the question readers are actually asking: with more rooftop solar feeding the grid and demand patterns shifting, can the system survive one plant tripping at the wrong moment?

The honest answer, for now, is that nobody official has given one. The grid is back. The committee has not yet reported. What is known is narrow and solid: the failure started around midday on Saturday, a breakdown at Upper Kotmale is the suspected trigger, restoration took about seven hours for most of the island, and the government has promised a technical inquiry rather than a shrug.

What happens next

Watch for the committee's membership and its terms first, because they decide whether the report will name failures or describe weather. Watch, too, for any rule changes for rooftop solar owners, who were asked to switch off their own systems to save everyone else's supply, and for the water board's account of how close reserves came to running short. An island grid has no neighbours to borrow power from. Saturday showed what that means when it fails.