Mystery Flash Triggers Power Outage for 100,000 Users on Russia’s Sakhalin Island

Late on Monday, Russian media and local Telegram channels began reporting a large-scale blackout on Sakhalin Island, a remote region in Russia’s Far East, 90 kilometers (56 miles) north of Japan’s Hakkaido Island in the Sea of Okhotsk.

By early morning local time, as snow fell across the island, much of its southern and central parts remained without power or water.

According to regional reports, the outage affected several major towns – including Dalneye, Poronaysk, Makarov, Uglegorsk, Kholmsk, Tomari, and Korsakov. Residents of Yuzhno-Sakhalinsk, the island’s administrative center, also reported interruptions in their water supply.

Eyewitnesses described seeing a bright flash moments before the blackout, which local media referred to as a “light impulse.”

The flash was observed near the Sakhalin TPP-1 “combined heat and power plant,” prompting speculation about a possible explosion or major technical failure.

Throughout the day, emergency repair crews worked to restore power across the island. Later, Sakhalin’s authorities confirmed that the outage was caused by a break in a lightning protection cable on a high-voltage transmission line between two key substations in Yuzhno-Sakhalinsk.

Officials estimated that roughly 100,000 people were left without electricity. Local channels continued to report new power and water outages well into the night, describing the scale of the failure as “massive.”

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Video footage circulating on Russian social media appeared to show the initial flash that preceded the blackout.

Earlier this month Vyacheslav Gladkov, the governor of Russia’s Belgorod region, warned of potential blackouts during reports of a Ukrainian missile strike.

The Belgorod region borders eastern Ukraine’s Luhansk, Kharkiv and Sumy regions and has witnessed frequent hostilities, including occasional ground incursions that started in May 2023.

Gladkov warned of a potential Ukrainian missile strike at around 7 p.m. local time, reporting just over 30 minutes later that air defenses had been activated and reported damage to some properties in the city of Belgorod, adding that some settlements in the region were also affected.

“Debris falling in Belgorod ignited a fire in debris; fire crews are working to extinguish the blaze. Windows were shattered at a commercial building, and the roof and façade were damaged. Two cars were damaged,” he wrote.

Close to 15 minutes later, Gladkov warned of possible “short-term rolling power outages.”

Local Telegram channel Pepel corroborated the reports of blackouts, noting that streetlights were out while traffic lights were working an hour after the original warning.