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The outage hit at dawn, plunging the island into an eerie silence as electrical appliances and air conditioners shut down before those who could afford generators turned them on.

“It had to be on the 31st of December!� exclaimed one man, who only gave his name as Manuel, as he stood outside a grocery store in the capital of San Juan, grumbling about the outage that coincided with his birthday. “There is no happiness.�

Nearly 90% of 1.47 million clients across Puerto Rico were left in the dark, according to Luma Energy, a private company that oversees electricity transmission and distribution.

Luma said in a statement that it appears the outage was caused by a failure of an underground power line, saying it is restoring power “in the quickest and safest way possible.� A Luma spokesman told The Associated Press that the incident was under investigation.

The blackout fanned simmering anger against Luma and Genera PR, which oversees the generation of power in Puerto Rico, as a growing number of people call for their ouster.

Governor-elect Jenniffer González Colón, who is set to be sworn in on Jan. 2, has called for the creation of an “energy czar� to review potential Luma contractual breaches while another operator is found.

Meanwhile, Gov. Pedro Pierluisi said he was in touch with Luma and Genera PR, adding on X that “we are demanding answers and solutions.�

Puerto Ricans began to plan ahead.

“I'll go to my balcony. That's where I'll sleep,� Raúl Pacheco said with a shrug, as the 63-year-old diabetic sat on a walker nursing an injured foot.

Julio Córdova, a municipal worker, said he got dressed by the light of his cellphone and planned to buy candles.

“This affects me because I had plans. It couldn't have been yesterday or tomorrow?" he said, shaking his head as he raked leaves.

While blackouts are rare in Puerto Rico, the island struggles with chronic power outages blamed on a crumbling power grid that was razed by Hurricane Maria, a Category 4 storm in September 2017.

The system, however, was already in decline after years of lack of maintenance and investment.

Only recently did crews start making permanent repairs to Puerto Rico’s power grid following Hurricane Maria. The island continues to depend on generators provided by the U.S. Federal Emergency Management Agency to help stabilize the grid.

In November, Puerto Rico’s government asked U.S. officials for permission to keep using more than a dozen portable generators for two additional years.

Some Puerto Ricans took the latest outage in stride.

“They're part of my everyday life,� said Enid Núñez, 49, who said she ate breakfast before work thanks to a small gas stove she bought for such events.

Meanwhile, Puerto Rico's Electric Power Authority struggles to restructure more than $9 billion in debt, the largest of the island's government agencies.