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Cheers erupt as Puerto Rico slowly emerges from blackout

People wait in line to buy ice during a massive blackout in San Juan, Puerto Rico, Thursday, September 22, 2016. Puerto Ricans faced another night of darkness Thursday as crews slowly restored electricity a day after a fire at a power plant caused the aging utility grid to fail and blacked out the entire island. (AP Photo/Carlos Giusti)

People wait in line to buy ice during a massive blackout in San Juan, Puerto Rico, Thursday, September 22, 2016. Puerto Ricans faced another night of darkness Thursday as crews slowly restored electricity a day after a fire at a power plant caused the aging utility grid to fail and blacked out the entire island. (AP Photo/Carlos Giusti)

SAN JUAN, Puerto Rico — Cheers erupted as lights slowly began to flicker on across Puerto Rico overnight as the U.S. territory struggled to emerge from an island-wide blackout following a fire at a power plant that caused the aging utility grid to fail.

More than 390,000 of 1.5 million homes and businesses served by the power utility had electricity restored by late Thursday, with cries of, "The lights are back on!" echoing through some neighbourhoods .

Gov. Alejandro Garcia Padilla said he expected more than half of customers to have power by Friday morning.

"The number is rising rapidly," he said, adding that 90 per cent of customers will likely have power by Saturday. However, he cautioned: "Problems may arise. I don't want to create false expectations."

The blackout hit the entire island of 3.5 million people early Wednesday afternoon and prompted Garcia to activate the National Guard and declare a state of emergency. Public schools remained closed on Friday, and heavy storms that hit the island Thursday afternoon knocked out power to some areas where electricity had been restored.

While those with power celebrated a return to normalcy, others lamented having to face another night in darkness with no air conditioning in the tropical heat. Most Puerto Ricans don't have generators, and many expected to once again drag mattresses out to balconies and porches to spend the night outside.

"It's been horrible," said San Juan resident Elizabeth Maldonado, adding that she was resigned to another sleepless night. "I take showers every three hours at night to stay refreshed."

For those who could afford it, hotels offered special rates for residents that were quickly snapped up.

As sunset approached on Thursday, long lines formed at ice plants, supermarkets and gas stations. Elsewhere, people crouched around power outlets at generator-powered supermarkets and malls to charge cellphones.

Traffic lights remained dark most of Thursday, and police officers stood in the streets directing traffic all day, some in heavy downpours. Workers at the main international airport filled out luggage tickets by hand.

The governor said at least one person died the first night from exposure to carbon monoxide after setting up a personal generator. A 76-year-old man was taken to the hospital in good condition after spending the night trapped in an elevator at a government building, Garcia said. In addition, four police officers were hit while directing traffic but were expected to recover.

Localized power outages are common in Puerto Rico, which has an outdated energy infrastructure, but widespread failures such as this are extremely rare.

The Electric Power Authority said it was trying to determine what caused the fire at the Aguirre power plant in the southern town of Salinas. The fire apparently knocked out two transmission lines that serve the broader grid, which tripped circuit breakers that automatically shut down the flow of power as a preventive measure, officials said. Executive director Javier Quintana said a preliminary investigation suggests that an apparent failure on one transmission line that might have been caused by lightning caused the switch to explode.

Garcia rejected suggestions the blackout was caused by maintenance problems that have plagued the utility for years, largely a result of the island's economic and fiscal crisis. He said the switch where the fire happened had been properly maintained.

It was not yet clear how much damage the fire caused. The utility is struggling with a $9 billion debt that it hopes to restructure as it faces numerous corruption allegations. Company officials have said they are seeking revenue to update outdated equipment.

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Danica Coto on Twitter: www.twitter.com/danicacoto