HAVANA — Officials in Cuba reported an islandwide blackout Monday. Monday's blackout marked the third major outage in four months.

A separate blackout just over a week ago affected western Cuba, leaving millions without electricity. President Miguel Díaz-Canel warned Friday that the island had gone more than three months without oil shipments and was relying on solar power, natural gas and aging thermoelectric plants.

Cuba has blamed the crisis on a U.S. energy blockade. U.S. President Donald Trump warned in January of tariffs on any country that sells or provides oil to Cuba. "Cuba right now is in very bad shape," Trump said. "And we'll be doing something with Cuba very soon."

The Trump administration is seeking the departure of President Miguel Díaz-Canel as part of ongoing negotiations with the Cuban government, according to a U.S. official and a source with knowledge of talks. The Trump administration is demanding that Cuba release political prisoners and move toward political and economic liberalization in return for lifting sanctions.

President Miguel Díaz-Canel confirmed Friday that Cuba was holding talks with the U.S. government. Critical oil shipments from Venezuela to Cuba were halted after the U.S. attacked Venezuela in early January and arrested its then-president, Nicolás Maduro.

Electricity was being restored to hospitals and some homes Tuesday afternoon. The Ministry of Energy and Mines posted on X that the country's electrical system experienced a complete disconnection and that it was investigating.

By late Monday, power had been restored to 5% of residents in Havana, representing about 42,000 customers, state-owned media reported. The Ministry of Energy and Mines said it had restored the electrical system in Pinar del Rio and Holguin and that some microsystems were beginning to operate.

The Cuban government has postponed surgeries for tens of thousands of people due to the power crisis. "The power outages are driving me crazy," said Dalba Obiedo, a Havana resident. "Last night I fell down a 27-step staircase. Now I have to have surgery on my jaw. I fell because the lights went out."

Cuba produces approximately 40% of its petroleum domestically, but this has not been sufficient to meet demand as its electric grid continues to deteriorate. Officials warned that the power network could fail again.

Cuba has a population of about 11 million people.