[1][2] By the following day it was confirmed that power had been restored to most of Argentina and Uruguay, and Argentine President Mauricio Macri promised a full investigation.

[5][7] Although some media reports suggested that the blackout extended to areas in Chile[2] and southern Brazil, these claims were later denied by Chilean[8] and Brazilian[9] national authorities.

President Mauricio Macri called the event “unprecedented.”[10] The Argentine electricity distributor Edesur announced via Twitter at 7:50 a.m. that the entire power supply for Argentina and Uruguay had been disrupted.

The blackout caused significant disruptions in subway and train services but did not impact airborne transport, including electric-powered aircraft.

[11] The blackout had an impact on local gubernatorial elections taking place in Argentina, where the lack of power forced voters to fill out ballots in the dark, using their mobile phones as flashlights.

[11][14] Medical patients who were dependent upon home equipment were urged to attend local hospitals, where similar devices were still operational, as they were powered by backup generators.

[16] Preliminary reports suggested that the blackout likely originated from a fault in a 500 kV circuit from the municipality of Colonia Elía to Belgrano, a suburb of Buenos Aires.