Fidel Castro once called Cuba’s power plants “prehistoric.” But the country still relies on them, contributing to the longest blackout since the collapse of its former patron, the Soviet Union.

Millions of Cubans awoke on Sunday to find their homes still without power after another partial grid failure overnight, deepening a crisis that has raised questions over the viability of the government's efforts to reestablish electrical service.

Cuba’s government says some electricity has been restored on the island after one of the country’s major power plants failed and left millions without electricity for two days

The Cuban government had just announced emergency measures to reduce electricity use — then the power went out across the entire nation.

Millions of Cubans faced a third consecutive day without power as a hurricane loomed over the island nation Sunday. Sixteen percent of the country had power restored Saturday but attempts to restore it more widely failed overnight,

Cuba's efforts to restore power to the island were derailed for a third time late on Saturday, Cuban authorities said shortly before midnight, leaving millions in the dark and raising fresh questions over the viability of the government's bid to reestablish electrical service.