Updated: 2:15 p.m. ET

(Bloomberg) -- Puerto Rico declared a state of emergency Thursday as authorities worked to restore electricity to almost 1.5 million utility customers a day after a power-plant fire caused widespread blackouts.

Governor Alejandro Garcia Padilla, who announced the state of emergency on his Twitter account, said about half of the island’s main utility clients should have electricity by Thursday afternoon. Power to some 130,000 users had been restored by early morning.

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