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Mass Blackout Hits Buenos Aires Metro After Morón Substation Failure Trips Four 220 kV Lines

The failure sharpened scrutiny of grid bottlenecks, accelerating calls for battery storage and new transmission.

Overview

  • Officials said a fault at Edenor’s Morón high‑voltage substation disconnected four 220 kV lines, cutting roughly 3,000–3,311 MW from the system.
  • ENRE reported a simultaneous peak of 840,392 users without power and tallied 934,060 affected in total, with outages spanning Edenor and Edesur areas.
  • Edenor reported that more than half of affected users were restored within 30 minutes and over 90% within an hour, though localized cuts persisted in some neighborhoods.
  • Public services were disrupted as Subte Line D halted, Line H ran with delays, Mitre branches and the Tren de la Costa were suspended, many traffic lights failed, and Aeroparque saw limited power issues without flight impacts.
  • AySA warned that water production and distribution would recover gradually and urged responsible use, while inspections at Morón continue and experts pressed for the AlmaGBA battery rollout and a new privately financed transmission line.