Cuba’s electrical grid collapsed again early on Saturday morning, state-run media reported, plunging the entire country into blackout for a second time just hours after authorities announced they had begun reestablishing service.

CubaDebate, one of the islands state-run media outlets, said Cub’s grid operator, UNE, had reported at 6:15AM the “total disconnection of the national electro-energetic system.”

“The Electric Union is working on its reestablishment,” the brief message said.

Cub’s electrical grid first collapsed around midday on Friday after one of the island’s largest power plants failed, suddenly leaving more than 10 million without power.

Even before the grid’s collapse, an electricity shortfall on Friday had forced Cub’s communist-run government to send non-essential state workers home and cancel school classes for children as it sought to conserve fuel for generation.

But lights began to flicker on in scattered pockets across the island early in the evening on Friday, offering some hope that power would be restored.

The grid operator has not yet provided any details on what caused the grid to collapse again on Saturday, or how long it will take to reestablish service.

Cub’s government has blamed weeks of worsening blackouts – often 10 to 20 hours a day across much of the island – on deteriorating infrastructure, fuel shortages and rising demand.

Strong winds that began with Hurricane Milton last week had also complicated the island’s ability to deliver scarce fuel from boats offshore to feed its power plants, officials have said.

Fuel deliveries to the island have dropped off significantly this year, as Venezuela, Russia and Mexico, once key suppliers, have reduced their exports to Cuba.

Key ally Venezuela slashed by half its deliveries of subsidized fuel to Cuba this year, forcing the island to search elsewhere for far more pricey oil on the spot market.

Cuba’s government also blames the U.S. trade embargo, as well as sanctions under then-President Donald Trump, for ongoing difficulties in acquiring fuel and spare parts to operate and maintain its oil-fired plants.

The United States on Friday denied any role in the grid collapse in Cuba.

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