Breakdown of energy supply systems

Cuba's national electric grid collapsed ​on Monday at midday, the country's ‌grid operator said, leaving around 10 million people on the Caribbean island without ​power.Grid operator UNE said it ​was investigating the cause of the ⁠nationwide blackout.Cuba has for months suffered ​from hours-long, and more recently, days-long ​power outages linked in part to a decrepit grid and a U.S. imposed oil blockade that has ​cut off the island's fuel supply.The ​nationwide outage is more bad news for Cubans ‌already ⁠exhausted from rolling blackouts that make it impossible for many to work or sleep in the Caribbean summer ​heat.Cuba has ​frequently ⁠struggled to keep the lights on during a years-long economic ​crisis but the Communist-run government ​has ⁠entered unprecedented territory under increased pressure from U.S. President Donald Trump.Nearly two-thirds ⁠of ​the country was already ​without power when the grid collapsed on Monday.