Overview
- Regional authorities said a grounding lightning wire on a line between the Central and Yuzhno-Sakhalinsk substations broke and fell onto conductors, activating automatic protections and splitting the grid.
- Anti-emergency automation reduced Yuzhno-Sakhalinsk TPP-1 to house load, isolating parts of the system during the event.
- Sakhalinenergo reported about 277 MW of roughly 340 MW demand was curtailed at the peak, while the Noglinskaya gas plant continued supplying northern areas.
- Outages affected Yuzhno-Sakhalinsk’s 9th, 12th and 13th microdistricts as well as Dalnee, Poronaysk, Makarov, Uglegorsk, Kholmsk, Tomari and Korsakov.
- By 15:30 local time, service was restored to 99% of consumers and main high-voltage lines were energized, with crews repairing two 6–10 kV sections and a technical probe under way.