The Communist-run government earlier in the day closed schools and non-essential industry and sent most state workers home in a last-ditch effort to keep the lights on for residents

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 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 experienced a second nationwide blackout early on Saturday after an initial collapse of the electrical grid on Friday, affecting over 10 million people. The government attributed the outages to infrastructure issues,

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.