Jefferson County Power Outage History
2014–2025 · Kentucky
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Nov 12, 2025 | 0 hrs | 141,810 (35%) | Unnamed event |
| Mar 3, 2023 | 148 hrs | 82,578 (20%) | High Wind |
| Nov 15, 2018 | 86 hrs | 79,447 (19%) | Ice Storm |
| Sep 13, 2019 | 1 hrs | 65,587 (16%) | Unnamed event |
| May 26, 2024 | 102 hrs | 54,284 (13%) | Thunderstorm Wind |
Over the 12 years from 2014 to 2025, Jefferson County recorded 3,306 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Jefferson County started November 12, 2025, lasting 0 hours and leaving up to 141,810 customers without power (35% of the county) at its peak.
June has historically been the worst month for outages in Jefferson County, with 411 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of C, placing it in the 48th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Kentucky
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Knox County | C | 48th |
| Cumberland County | C | 47th |
| Caldwell County | C | 48th |
| Christian County | C | 47th |
| Grant County | C | 48th |
FAQ
How often does power go out in Jefferson County?
Between 2014 and 2025, Jefferson County recorded 3,306 outage events, averaging 2.3 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of C, in the 48th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started November 12, 2025, lasting 0 hours and affecting up to 141,810 customers.