Argentina and Uruguay woke up in the dark on Sunday after an unprecedented power cascade over their shared electricity network, affecting millions of people.
The Edesur power tool tweeted that "a great failure" left Argentina and Uruguay without power. BBC reported that parts of Paraguay were also affected.
Edesur's spokesman Alejandra Martinez told Argentine media "something like this has never happened", according to BBC .
At 12th local time Edesur tweeted as it had restored service to 450,000 customers, with hospitals and health centers a priority.
In Buenos Aires, Constitucion railway station was empty, by train stopped Bloomberg reported.
Traffic lights failed over the city, and some shopkeepers ran generators to keep the lights on.
] The Argentinean news site Infobae reported that the power outage stopped trains and subway stations;
Uruguay's state energy department wrote that "an error in the Argentine network" left Uruguay without light, according to Infobae .
] The power outage fell on a day of provincial elections in some of Argentina's provinces.
The reason for the failure is not clear.