Jefferson County Power Outage History
2019–2025 · Washington
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 |
|---|---|---|---|
| Nov 5, 2022 | 96 hrs | 18,119 (66%) | Unnamed event |
| May 27, 2025 | 2 hrs | 17,647 (65%) | Unnamed event |
| Nov 15, 2021 | 67 hrs | 11,002 (40%) | Unnamed event |
| Jun 28, 2022 | 3 hrs | 7,937 (29%) | Unnamed event |
| Dec 17, 2025 | 37 hrs | 7,495 (27%) | Unnamed event |
Over the 7 years from 2019 to 2025, Jefferson County recorded 374 distinct power outage events, averaging 4.8 hours per event.
The single worst outage on record in Jefferson County started November 5, 2022, lasting 96 hours and leaving up to 18,119 customers without power (66% of the county) at its peak.
January has historically been the worst month for outages in Jefferson County, with 49 events recorded during that month across the dataset.
Based on this history, Jefferson County earns a Reliability Grade of D, placing it in the 34th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Jefferson County.
| County | Grade | National percentile |
|---|---|---|
| Thurston County | D | 33rd |
| Garfield County | D | 32nd |
| Kittitas County | D | 31st |
| Clallam County | D | 38th |
| King County | D | 28th |
FAQ
How often does power go out in Jefferson County?
Between 2019 and 2025, Jefferson County recorded 374 outage events, averaging 4.8 hours each.
What is Jefferson County's reliability grade?
Jefferson County has a Reliability Grade of D, in the 34th national percentile.
What was the worst power outage in Jefferson County?
The worst outage on record started November 5, 2022, lasting 96 hours and affecting up to 18,119 customers.