Cuba remained largely without power on Saturday morning after the island´s grid collapsed the night before, knocking out electricity for 10 million people and raising fresh questions about the viability of its antiquated generating system.

Cuba’s power grid collapsed Friday night, triggering a nationwide power outage and plunging its more than 10 million people into darkness.

Cuba suffered a general blackout on Friday caused by a crash of its national electricity grid, officials said, the fourth major power outage on the cash-strapped communist island in five

Cuba has struggled with blackouts in recent months, including a nationwide one in December. Friday’s power failure was the fourth widespread one in five months. Government officials blame U.S. economic sanctions for the ongoing crisis,