Overview
- Edesur said a fault at the Bosques substation triggered cascading outages across multiple substations in Buenos Aires City and the southern Conurbano.
- ENRE’s live dashboard peaked near 998,414 affected users around 4:00 before rapid downward revisions as restorations advanced.
- Edesur reported more than 50% of affected customers back on line near 4:00 and over 96% by about 4:30, with reconnections proceeding in stages.
- By morning, thousands still lacked power, with volatile updates showing roughly 19,000 to more than 40,000 users without service at different times.
- As the outage unfolded, ENRE formalized new tariffs effective January 1 via Resolutions 841/2025 and 842/2025, including CPD increases of 2.31% for Edenor, 2.24% for Edesur, and a 3.88% rise in the wholesale energy price.