Cuba’s power grid has ground to a halt for a second time in as many days, leaving 10 million on the island without power and the Caribbean island in a growing sense of crisis.

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.

Cuba’s electrical grid went down Friday after one of the island’s major power plants failed, a day after a massive blackout swept across the Caribbean island and with no official estimate for when service will be restored.

WHY DID THE GRID COLLAPSE? Cuba's electrical grid and oil-fired power plants are obsolete and crumbling, constructed decades ago and scarcely maintained. And because Cuba produces very little fossil fuel of its own - with limited refining capacity - it depends almost entirely on imports to assure adequate generation.

Cuba's national grid collapsed on Friday, leaving the entire population of 10 million people without electricity and underscoring the precarious state of the Communist-run country's infrastructure and economy.

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 re-establishing service.

As Cuba’s electrical grid shut down Friday, leaving millions of Cubans without power nationwide hours after the government declared an “energy emergency,” authorities have not said when the lights will be back on.

Cuba’s national electrical grid shut down Cuba's national electrical grid shut down after one of the island's major power plants failed, Cuba's energy ministry said, plunging the entire country into a blackout.