Millions of people across Argentina and Uruguay were left without power early on Sunday after a massive power failure hit the Argentine grid, according to Argentina's Energy Secretariat.
The cause of the outage was still unclear, but the Argentina energy agency said in a statement that authorities were working to restore power to provinces in the northwestern corner of the country.
Several major cities, including the Argentine capital of Buenos Aires, awoke to darkness on Sunday morning, with public transportation brought to a halt by the outage.
Total recovery was estimated to take a few hours, according to the Energy Secretariat.
A spokesman for Brazil´s power system operator (ONS) said the outage had not impacted the regional neighbor to the north.
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