Jefferson County Power Outage History
2017–2025 · Idaho
Better than average — fewer or shorter 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 |
|---|---|---|---|
| Jun 7, 2024 | 22 hrs | 5,191 (51%) | High Wind |
| Apr 3, 2019 | 3 hrs | 5,030 (49%) | Unnamed event |
| Oct 26, 2021 | 1 hrs | 3,630 (35%) | Unnamed event |
| Jun 20, 2025 | 9 hrs | 3,219 (31%) | Unnamed event |
| May 31, 2024 | 1 hrs | 3,082 (30%) | High Wind |
Over the 9 years from 2017 to 2025, Jefferson County recorded 660 distinct power outage events, averaging 2.0 hours per event.
The single worst outage on record in Jefferson County started June 7, 2024 (High Wind), lasting 22 hours and leaving up to 5,191 customers without power (51% of the county) at its peak.
July has historically been the worst month for outages in Jefferson County, with 80 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of B, placing it in the 64th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Jefferson County's outage profile
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Outage-prep kit
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Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Lincoln County | B | 63rd |
| Washington County | B | 68th |
| Elmore County | C | 59th |
| Jerome County | C | 59th |
| Nez Perce County | C | 58th |
FAQ
How often does power go out in Jefferson County?
Between 2017 and 2025, Jefferson County recorded 660 outage events, averaging 2.0 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of B, in the 64th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started June 7, 2024 (High Wind), lasting 22 hours and affecting up to 5,191 customers.