HAVANA — A total blackout hit Cuba on Wednesday, the latest in a series of outages blamed on aging infrastructure and fuel shortages at power plants.

It was the second island-wide outage this year, with three other blackouts reported late last year.

The Ministry of Energy and Mines said on social platform X the latest outage could be tied to a malfunction at one of Cuba’s biggest thermoelectric plants.

Argelio Abad, the ministry’s vice minister, said on state TV the grid shut down after an apparently erroneous message warning of overheating disconnected the thermoelectric plant. He added that officials immediately began to build a type of microsystem to deliver electricity to infrastructure that provides basic services.

The ministry said crews were working to restore power to the island of roughly 10 million people, with electricity returning to hospitals, food production plants and other high-priority businesses.

Prime Minister Manuel Marrero made an appearance at Cuba’s state-run power company and asked Cubans for their trust as he said on state TV that electricity would be restored gradually.

Some Cubans, like 65-year-old Mayté García, believed they would be without power for a couple of days.

She said she was “outside, taking in the fresh air” as she waited for electricity to return.

“If you buy something, you don’t know if you’ll be able to keep it. Many people’s food has spoiled,” García said of items in refrigerators and freezers.

Earlier this week, an outage hit Cuba’s eastern region, leaving people from Las Tunas to Guantánamo in the dark for several hours.

In February, the government suspended classes and work activities for two days due to a shortage in electricity generation.

There is a severe economic and energy supply crisis in Cuba. It has worsened in recent years due to U.S. sanctions intended to put pressure on the island to change its political model.

The sanctions have prevented the Caribbean nation from having sufficient foreign currency to buy fuel or repair its aging thermoelectric plants, many of which have been operating for more than 30 years.