A widespread power failure early Sunday left all of mainland Argentina and Uruguay without power, a blackout that an energy company official called “unprecedented.” The blackout’s cause remained unclear. But much of Argentina was hit by heavy rainfall this weekend, and Uruguay’s state-owned utility, UTE, said some systems were damaged by the recent rain and still needed to be repaired. The power failure was traced to two 500,000-volt lines in a corridor that takes power to Buenos Aires from the Yacyretá dam, which serves Argentina and Paraguay. But why it occurred was still being determined. The blackouts brought the transportation system in Buenos Aires to a halt as trains and subways stopped and traffic lights went dark. The water company AySA, based in Buenos Aires, asked customers to ration water because its distribution system had shut down. Flights […]