The outage is believed to be linked to a problem at the Costa Sur power plant outside the town of Guayanilla near the island’s southwest coast, Puerto Rican utility company LUMA Energy said.
“The power grid suffered a massive island-wide power outage, potentially caused by a circuit breaker failure at the Costa Sur generating station,” LUMA officials said Wednesday. In that statement, the company said it expects restoration efforts to continue through Thursday.
Firefighters extinguished flames that hit two substations at the Costa Sur plant, the Puerto Rico Fire Bureau announced on Facebook on Wednesday. The cause of the fire was not immediately known, firefighters said.