Miami-Dade 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 | 12 hrs | 1,777,800 (98%) | Hurricane Irma |
| Sep 11, 2017 | 1 hrs | 1,618,030 (89%) | Hurricane Irma |
| Sep 11, 2017 | 4 hrs | 1,616,900 (89%) | Hurricane Irma |
| Sep 11, 2017 | 65 hrs | 1,604,860 (89%) | Hurricane Irma |
| Sep 8, 2017 | 59 hrs | 898,340 (50%) | Hurricane Irma |
Over the 12 years from 2014 to 2025, Miami-Dade County recorded 13,735 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Miami-Dade County started September 11, 2017 (Hurricane Irma), lasting 12 hours and leaving up to 1,777,800 customers without power (98% of the county) at its peak.
August has historically been the worst month for outages in Miami-Dade County, with 1,346 events recorded during that month across the dataset.
Based on this history, Miami-Dade County earns a Reliability Grade of D, placing it in the 34th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Miami-Dade County's outage profile
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Similar counties in Florida
Counties with the closest reliability grade and national percentile to Miami-Dade County.
| County | Grade | National percentile |
|---|---|---|
| Bradford County | D | 34th |
| Clay County | D | 34th |
| Brevard County | D | 33rd |
| Okeechobee County | D | 35th |
| St. Johns County | D | 33rd |
FAQ
How often does power go out in Miami-Dade County?
Between 2014 and 2025, Miami-Dade County recorded 13,735 outage events, averaging 2.7 hours each.
What is Miami-Dade County's reliability grade?
Miami-Dade County has a Reliability Grade of D, in the 34th national percentile.
What was the worst power outage in Miami-Dade County?
The worst outage on record started September 11, 2017 (Hurricane Irma), lasting 12 hours and affecting up to 1,777,800 customers.