The fire broke out in a transformer at LUMA’s Monacillos station, the company said. Personnel from the Puerto Rico Police, Fire Department and Medical Emergencies are on site and no injuries have been reported.
Government Pedro Pierluisi called it an explosion that both state and federal law enforcement agencies are investigating the cause.
“All the resources of the PR government are available to deal with the emergency caused by the fire at the Monacillos station in Río Piedras. Firefighters have already arrived at the scene to deal with the situation. As soon as [firefighters] confirm more details, we will let you know, “Pierluisi said on Twitter.
“The priority must be to restore the electricity service as soon as possible, and our employees can be sure that we make sure that this is the case. At the same time, as soon as we have the results of the investigations related to the cause of this incident, the person responsible for it, will have to correspond to the people of Puerto Rico, ”he said.
“The FBI is evaluating the situation with regard to the massive blackout,”
Website hit by cyber attack earlier the same day
LUMA Energy said it was the victim of a previous attack by the Distributed Denial of Service where a website was deliberately hit by huge amounts of web traffic in an attempt to overwhelm it.
“The DDoS attack was identified and has issued 2 million visits per second,” LUMA Energy said in a statement. “As a result, many clients may have had difficulty accessing the information related to their accounts.”
There was no immediate indication of any connection between the site attack and the underground explosion.
“The attack has been reported to the relevant authorities and LUMA is awaiting the results of an ongoing investigation,” according to the press release.
LUMA is a joint venture between Quanta Services and the Canadian energy company ATCO, which was chosen by the Puerto Rican government to take over the operation of the electricity grid from its former public electricity supply, PREPA. LUMA has been responsible for the electricity grid since 1 June.
CNN’s Christina Carrega contributed to this report.