Thurston County Power Outage History
2015–2025 · 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 |
|---|---|---|---|
| Oct 25, 2025 | 32 hrs | 50,307 (35%) | Unnamed event |
| Jan 13, 2021 | 88 hrs | 39,455 (28%) | Flood |
| May 4, 2017 | 17 hrs | 38,367 (27%) | Thunderstorm Wind |
| Dec 17, 2025 | 60 hrs | 31,765 (22%) | Unnamed event |
| Aug 29, 2015 | 40 hrs | 25,109 (18%) | Unnamed event |
Over the 11 years from 2015 to 2025, Thurston County recorded 1,286 distinct power outage events, averaging 3.8 hours per event.
The single worst outage on record in Thurston County started October 25, 2025, lasting 32 hours and leaving up to 50,307 customers without power (35% of the county) at its peak.
November has historically been the worst month for outages in Thurston County, with 147 events recorded during that month across the dataset.
Based on this history, Thurston County earns a Reliability Grade of D, placing it in the 33rd 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 Thurston County.
| County | Grade | National percentile |
|---|---|---|
| Jefferson County | D | 34th |
| Garfield County | D | 32nd |
| Kittitas County | D | 31st |
| Clallam County | D | 38th |
| King County | D | 28th |
FAQ
How often does power go out in Thurston County?
Between 2015 and 2025, Thurston County recorded 1,286 outage events, averaging 3.8 hours each.
What is Thurston County's reliability grade?
Thurston County has a Reliability Grade of D, in the 33rd national percentile.
What was the worst power outage in Thurston County?
The worst outage on record started October 25, 2025, lasting 32 hours and affecting up to 50,307 customers.