Cuba was plunged into another nationwide power outage on Tuesday after a failure at a generating unit triggered the collapse of the National Electric System (SEN), marking the third island-wide blackout in less than two weeks as the country struggles with worsening fuel shortages and an ongoing economic crisis.

State-owned Electric Union said the outage began around midday after a malfunction at a power plant in the eastern province of Holguín caused a sudden change in grid frequency, forcing the national electricity network offline.

Officials from the Ministry of Energy and Mines said emergency restoration procedures were activated immediately. The process involves creating isolated “micro-islands” of electricity before reconnecting them to rebuild the national grid. Priority has been given to hospitals, food processing facilities and other essential services.

By Tuesday afternoon, electricity had been restored to parts of Havana, with authorities reporting that about 4 percent of the capital had regained power. Provincial officials in Guantánamo, Cienfuegos and Matanzas also confirmed that electricity had returned to hospitals and selected urban areas, including Matanzas’ historic city centre.

The latest outage follows nationwide blackouts last Monday and Friday that left more than 9 million people without electricity. Cuba also experienced two major nationwide outages in March, along with several regional disruptions during the year.

The repeated failures have disrupted daily life across the island. Public transportation has been severely affected, work schedules have been shortened, flights have faced cancellations and hospitals have struggled to maintain normal operations. Residents have also experienced interruptions to cooking, water supplies, internet access and telephone services.

Fuel shortages have intensified since January, when US President Donald Trump threatened tariffs on countries supplying or selling oil to Cuba. The measures have added pressure to an economy already facing years of financial hardship.

Cuba currently produces only about 40 percent of the fuel it requires, leaving it heavily dependent on imports. Officials have acknowledged that no immediate solution has emerged to secure additional fuel supplies, leaving the country’s ageing electricity infrastructure under continued strain.

Washington’s energy restrictions followed the capture of Venezuela’s then-President Nicolás Maduro and expanded existing sanctions already affecting Cuba’s economy. Authorities say the latest measures have compounded challenges created by previous sanctions and domestic economic reforms, including monetary unification.

The situation has also drawn political attention in the United States. Four Democratic members of Congress who visited Cuba over the weekend described the energy embargo imposed by the Trump administration as turning the island into a “silent Gaza,” highlighting the humanitarian impact of prolonged power shortages.

With fuel supplies remaining scarce and no immediate relief in sight, Cuba’s electricity system continues to face significant pressure, raising concerns that further nationwide outages could occur in the weeks ahead.