Cuba’s national power grid collapsed on Monday, causing a nationwide blackout, leaving nearly 10 million people without power and deepening the island’s ongoing energy crisis.State grid operator UNE said the fault occurred around noon and authorities were investigating the cause of the downfall.The nationwide blackout follows months-long power outages across Cuba, where aging power infrastructure and fuel shortages have resulted in frequent outages lasting several hours; And in some cases, days.Energy supplies on the island have also been affected by restrictions on fuel imports, with the Cuban government blaming US sanctions for limiting access to the oil needed to operate power plants.The latest collapse has added to the difficulties for residents already struggling with ongoing blackouts, which have disrupted daily life, businesses and essential services, especially during the peak of the Caribbean summer.Cuba is suffering from severe electricity shortages amid a long-running economic crisis, but the situation has worsened in recent months as the government faces growing financial and energy challenges.Nearly two-thirds of the country was without power even before the national grid completely failed on Monday, underscoring the severity of the power crisis, according to officials.