Overview
- The national regulator validated a peak of roughly 1,085,000 users without power between about 1:30 and 4:00 a.m.
- Edesur said a fault at Subestación Bosques cascaded to other substations, and reported staged restorations with more than half of affected customers back online by early morning.
- Outages persisted through the day with counts fluctuating from roughly 40,000 near mid‑afternoon to about 18,000 by early evening across Edesur and Edenor service areas.
- ENRE dispatched technical personnel to Bosques, opened a formal investigation, and requested a detailed report on causes, actions taken, and restoration timelines.
- The blackout followed a severe heat wave that pushed demand to critical levels, with ENRE noting lines and transformers operating above nominal capacity and heavy impacts across southern Conurbano districts and several Buenos Aires neighborhoods.