Miami-Dade CountyPower Outage History
What this grade means
(How grades are calculated)Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
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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 hr | 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Miami-Dade County, Florida that day.
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).
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 |
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 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.