Cuba faced power cuts across much of the country on Friday, the Energy Ministry announced. The power outages were caused by the failure of a substation, leading to the collapse of the power grid, it said on X. The Ministry added that work was under way to restore supply.

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, while others point to aging infrastructure, fuel shortages and the island’s susceptibility to hurricanes.