A power failure in Buenos Aires left hundreds of thousands of customers without electricity, shutting off traffic lights, stranding subway passengers and testing the Argentine capital's electric grid for the second time in 24 hours during a sizzling summer heat wave.
The blackout began Wednesday at 12:40 p.m. with the sudden failure of a high-voltage power line and hit over 622,000 customers mere hours after officials had restored service from an early morning outage, the Secretariat of Energy said.
