Electricity went out across Cuba on Monday as the country's fuel reserves dwindled and its power grid continued to collapse.
The outage was announced by Cuba's national electricity company, which serves the island's population of 10 million people. The company said on X that the cause was under investigation.
The Ministry of Energy and Mines wrote on X that it had activated power restoration protocols.
Fuel has been running out across Cuba since January, when US President Donald Trump threatened to impose tariffs on any country that sells or supplies oil to the island, deepening the ongoing economic and financial crisis there. Public transport has largely ground to a halt, and officials have cancelled tens of thousands of surgical operations.
Cuba produces only 40% of the fuel it needs. Some 730,000 barrels of oil delivered by a Russian tanker in late March were exhausted by the end of April.
The government has also rationed electricity supplies, cutting power for periods that can extend to more than 24 consecutive hours.
A mid-May blackout affected the island's eastern provinces, while a mid-March outage struck the entire island.