Volkswacht Bodensee - Island-wide blackout hits Puerto Rico on New Year's Eve

The "island-wide blackout" began at 5:30 am Tuesday (0930 GMT), Luma Energy, which manages power transmission on the island, said in a social media statement.

It added that preliminary findings pointed to a fault in an underground cable as the cause of the outage -- although the situation remained under investigation.

Jose Perez, director of external affairs at Luma, told AFP that the fault "caused a cascade effect" leading to the general blackout.

"We have already begun the restoration process for some customers, and the entire process will take 24 to 48 hours," Luma said.

US President Joe Biden was briefed on the outage, the White House said, noting that federal assistance was available if needed to speed up the restoration timeline.

"This is a long and arduous process that requires local and federal collaboration," Puerto Rico Governor Pedro Pierluisi said on X, adding that he requested the Federal Emergency Management Agency (FEMA) to "continue facilitating the projects we have begun."

The blackout came as the Caribbean island entered its high season for tourists visiting from the wintry US mainland, and just hours ahead of New Year's Eve celebrations.

Luma added in a subsequent statement that service had been restored to some critical facilities, including a medical center and hospital in the capital San Juan.

As of 7:00 pm local time (2300 GMT), the agency has restored service to more than 335,000 customers, approximately 23 percent of clients impacted by the outage, according to Luma's emergency response dashboard.

The company earlier noted that the incident left its roughly 1.5 million customers without service.

"The truth is that we have been dealing with this problem for a while," said Ismael Perez, a resident of Dorado, expressing frustration with the island's power grid.

He said he was concerned that residents could be left without power for more than two days.

Buildings stood in the dark early Tuesday while traffic intersections were without stop lights, with only the headlights of vehicles lighting up the streets.

In a social media post, Pierluisi said officials were in communication with Luma and others on the blackout.

"We are demanding answers," he said, adding that the public should be informed of the measures being taken to restore service throughout the island.

Luma said it would provide regular updates on social media.

Puerto Rico, a Spanish-speaking archipelago, came under US control in 1898 and has faced perennial infrastructure issues, exacerbated by the devastating Hurricane Maria in 2017.

The Puerto Rican power grid has suffered frequent outages since that hurricane tore through it.

M.Betschart--VB