St. Johns County Power Outage History
2014–2025 · Florida
Worse than average — more frequent or longer outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 11, 2017 | 176 hrs | 166,386 (90%) | Hurricane Irma |
| Sep 11, 2017 | 5 hrs | 153,507 (83%) | Hurricane Irma |
| Sep 11, 2017 | 12 hrs | 98,034 (53%) | Hurricane Irma |
| Oct 7, 2016 | 34 hrs | 84,092 (45%) | Heavy Rain |
| Oct 8, 2016 | 118 hrs | 45,540 (25%) | Heavy Rain |
Over the 12 years from 2014 to 2025, St. Johns County recorded 1,406 distinct power outage events, averaging 1.6 hours per event.
The single worst outage on record in St. Johns County started September 11, 2017 (Hurricane Irma), lasting 176 hours and leaving up to 166,386 customers without power (90% of the county) at its peak.
June has historically been the worst month for outages in St. Johns County, with 182 events recorded during that month across the dataset.
Based on this history, St. Johns County earns a Reliability Grade of D, placing it in the 33rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for St. Johns County's outage profile
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Similar counties in Florida
Counties with the closest reliability grade and national percentile to St. Johns County.
| County | Grade | National percentile |
|---|---|---|
| Brevard County | D | 33rd |
| Clay County | D | 34th |
| Union County | D | 32nd |
| Bradford County | D | 34th |
| Monroe County | D | 32nd |
FAQ
How often does power go out in St. Johns County?
Between 2014 and 2025, St. Johns County recorded 1,406 outage events, averaging 1.6 hours each.
What is St. Johns County's reliability grade?
St. Johns County has a Reliability Grade of D, in the 33rd national percentile.
What was the worst power outage in St. Johns County?
The worst outage on record started September 11, 2017 (Hurricane Irma), lasting 176 hours and affecting up to 166,386 customers.