San Juan MunicipioPower Outage History
What this grade means
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 31, 2024 | 14 hrs | 359,030 (91%) | Unnamed event |
| Apr 16, 2025 | 14 hrs | 282,355 (72%) | Flood |
| Jun 9, 2024 | 126 hrs | 193,845 (49%) | Excessive Heat |
| Aug 11, 2024 | 362 hrs | 174,374 (44%) | Unnamed event |
| Jan 1, 2025 | 17 hrs | 100,839 (26%) | Unnamed event |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for San Juan Municipio, Puerto Rico that day.
Over the 5 years from 2021 to 2025, San Juan Municipio recorded 3,557 distinct power outage events, averaging 7.1 hours per event.
The single worst outage on record in San Juan Municipio started December 31, 2024, lasting 14 hours and leaving up to 359,030 customers without power (91% of the county) at its peak.
March has historically been the worst month for outages in San Juan Municipio, with 347 events recorded during that month across the dataset.
Based on this history, San Juan Municipio earns a Reliability Grade of F, placing it in the 4th percentile nationally for grid reliability (higher percentile = more reliable).
Similar counties in Puerto Rico
Counties with the closest reliability grade and national percentile to San Juan Municipio.
| County | Grade | National percentile |
|---|---|---|
| Bayamón Municipio | F | 3rd |
| Caguas Municipio | F | 1st |
| Ponce Municipio | F | 0th |
| Arecibo Municipio | F | 0th |
| Mayagüez Municipio | F | 0th |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in San Juan Municipio?
Between 2021 and 2025, San Juan Municipio recorded 3,557 outage events, averaging 7.1 hours each.
What is San Juan Municipio's reliability grade?
San Juan Municipio has a Reliability Grade of F, in the 4th national percentile.
What was the worst power outage in San Juan Municipio?
The worst outage on record started December 31, 2024, lasting 14 hours and affecting up to 359,030 customers.