Thousands of San Juan residents were without electricity Wednesday evening as LUMA investigated disruptions affecting the island’s power system.
A significant power outage in San Juan, Puerto Rico, left tens of thousands of LUMA Energy customers without electricity on Wednesday, September 23, 2026, as the utility investigated disruptions affecting the transmission and distribution system.
The number of customers without service changed throughout the evening as crews responded and electricity service was restored in some areas.
According to reporting citing LUMA’s outage data, approximately 140,964 customers across Puerto Rico were experiencing interruptions around 9:10 p.m., with about 99,139 customers in San Juan and another 35,116 in Carolina.
A later report citing LUMA data placed the total number of customers without electricity at approximately 110,716 around 9:30 p.m., including 77,406 customers in San Juan, 26,876 in Carolina and 3,300 in Bayamón.
LUMA Investigates Power Disruptions
LUMA Energy said it was investigating the situation after experiencing events affecting the transmission and distribution system.
The utility also reported that one generation unit had gone out of service.
LUMA told Metro Puerto Rico that there had been no explosion associated with the incident and that crews were working to address the disruption.
The exact technical cause of the outage had not been fully established at the time of the latest reports.
San Juan Among Hardest-Hit Areas
San Juan accounted for the largest number of affected customers in the reports available Wednesday night.
The later LUMA figures showed approximately 77,406 San Juan customers without service, while Carolina had 26,876 and Bayamón had 3,300.
Earlier figures showed even higher numbers, demonstrating that the outage totals were changing as restoration efforts continued.
Residents experiencing an outage may therefore see different numbers depending on when the LUMA outage information is checked.
Restoration Efforts Underway
LUMA crews were responding to the disruptions as the utility investigated the cause and worked to restore service.
At the time of the latest available reports, LUMA had not announced a single restoration time for all affected customers.
Because the outage affected different parts of the electrical system, restoration times may vary between neighborhoods and individual customers.
Residents should check LUMA’s official service information for updates concerning their specific location.
LUMA System Conditions
LUMA’s official website was showing the island’s electricity demand, available generation capacity and reserve conditions on September 23.
The utility’s system page listed approximately 3,221 MW of available capacity against a 2,977 MW load forecast, with a projected reserve of about 244 MW.
These system figures can change throughout the day as generation units enter or leave service and electricity demand rises or falls.
Cause of San Juan Power Outage
The precise cause of the September 23 outage remains under investigation.
LUMA reported that events occurred within its transmission and distribution system and that a generation unit was also offline.
The utility did not report an explosion in connection with the incident.
Further technical information may be released after crews and engineers complete their assessment.
Residents Check Electricity Service
Customers experiencing an outage can use LUMA’s service tools to check their individual outage status and receive restoration information.
LUMA’s official website provides access to the Mi LUMA service and customer-support information. The utility lists 1-844-888-5862 as its customer contact number.
Residents should also exercise caution around any downed electrical lines and contact emergency services if they encounter an immediate electrical hazard.
Developing San Juan Power Outage
The San Juan outage remains a developing electricity-service story as LUMA crews continue responding.
The number of affected customers has already changed significantly during the evening, with later reports showing fewer customers without power than earlier figures.
At the latest reported stage, tens of thousands of customers remained affected, while LUMA continued investigating the system disruptions and working toward restoration.
Additional restoration information may be released as crews make progress.
Personal and Incident Details
| Detail | Information |
|---|---|
| Incident | Power outage |
| Date | September 23, 2026 |
| Primary Location | San Juan, Puerto Rico |
| Utility | LUMA Energy |
| San Juan Customers Affected | Approximately 77,406 in later report |
| Total Puerto Rico Customers Affected | Approximately 110,716 in later report |
| Earlier Total Affected | Approximately 140,964 |
| Earlier San Juan Total | Approximately 99,139 |
| Other Affected Areas | Carolina and Bayamón |
| Reported System Issue | Events in transmission/distribution system |
| Generation Issue | One generation unit reportedly offline |
| Explosion | None reported by LUMA |
| Cause | Under investigation |
| Restoration | Ongoing |
| Estimated Full Restoration Time | Not available |
| Injuries | Not reported |
| Fatalities | None reported |
| Emergency Evacuation | Not reported |
| Utility Crews | Responding |
| LUMA Customer Number | 1-844-888-5862 |
| Current Status | Power restoration and investigation ongoing |
Obituary, Memorial and Funeral Details
No deaths have been reported in connection with the September 23 San Juan power outage.
Therefore, there are currently no obituary, memorial or funeral arrangements associated with this electricity-service incident.
Disclaimer
Disclaimer: This article is based on current reporting and LUMA information available on September 23, 2026. Outage numbers changed rapidly during the evening; figures cited above represent specific update times and should not be interpreted as a single fixed total. LUMA reported that it was investigating transmission and distribution events and that a generation unit had gone offline. Details marked “Not available” have not been invented or assumed. Restoration conditions and affected-customer totals may change as crews continue their work.