A massive outage blacked out Argentina and Uruguay Sunday, leaving both South American countries without electricity, power companies said.
It came as people in parts of Argentina were preparing to go to the polls for local elections.
While no official number is yet available, millions are believed to be affected by the outage. Transener, Argentina's national grid operator, "opened the system and is powering up again to be able to regularize the service".
Reporting from Buenos Aires, Al Jazeera's Teresa Bo said some traffic lights and trains were working in the capital but that power had not been fully restored.
UTE later said service had been restored in parts of coastal cities and work was continuing for a full restoration.
The massive blackout on Father's Day left Buenos Aires dark early this morning, hobbling public transportation, cutting off water supply and crippling phone and internet communications across the city.
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By mid-morning, streets were largely empty in a rainy Buenos Aires, the Argentinian capital, although some stores were open, operating with generators, while Montevideo, the Uruguayan capital, was nearly entirely without power with only some traffic lights working.
"I've never seen something like this", Ubermann said.
The blackout affected the entire Argentine capital of Buenos Aires, in addition to provinces in the north and south. Tierra del Fuego is the only area that remains unaffected. "It's very unusual, it's never been this big,", the woman said.
"The causes are being investigated and have not yet been determined", Argentina's secretariat of energy said on its Twitter account, adding it would take "some hours" to restore power completely. "It's been raining non-stop", she said.
Since taking office, Macri has said that gradual austerity measures were needed to revive the country's struggling economy.
According to the Argentine Institute for Social Development, an average family in Argentina still pays 20 times less for electricity than similar households in neighboring countries.