Overview
- Power failed around 14:45 during a severe heatwave, with simultaneous outages across CABA and the conurbano peaking near one million users, according to ENRE tallies and company reports.
- Officials attributed the event to a failure at Edenor’s Morón substation that disconnected four 220 kV lines on the Morón–Rodríguez corridor, stripping roughly 3,000–3,311 MW from the system.
- Edenor said about 800,000 of its clients were initially affected, more than half regained service within 30 minutes and over 90% within the first hour, while interconnected Edesur areas suffered knock‑on cuts.
- Transport and services were disrupted as subte lines halted, Mitre branches and the Tren de la Costa were interrupted, the San Martín ran with delays, semaphores went dark, Aeroparque had localized issues, and TV broadcasts briefly flickered.
- AySA cautioned that water pumping recovers slowly and warned of low pressure or temporary cuts across multiple districts, as experts urged transmission upgrades and battery projects such as AlmaGBA to curb future large outages.