LUMA Energy Carolina Substation Explosion and Puerto Rico Power Outage

An internal fault at LUMA Energy’s Sabana Llana substation in Carolina, Puerto Rico, caused a widespread power outage Sept. 23, 2026, affecting more than 200,000 customers. An explosion and fire occurred at the site, but LUMA had not determined whether the fire caused the equipment failure or followed it. LUMA said the substation was back in service by Sept. 24 except for an investigation area; remaining customer outages were described as unrelated to the previous night’s event.