Walla Walla County Power Outage History
2017–2025 · Washington
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 |
|---|---|---|---|
| Nov 7, 2017 | 6 hrs | 16,800 (55%) | Unnamed event |
| Dec 29, 2017 | 24 hrs | 9,558 (31%) | Heavy Snow |
| Jul 9, 2018 | 10 hrs | 9,125 (30%) | Unnamed event |
| Aug 3, 2025 | 5 hrs | 8,704 (29%) | Unnamed event |
| Sep 11, 2024 | 7 hrs | 7,364 (24%) | Unnamed event |
Over the 9 years from 2017 to 2025, Walla Walla County recorded 266 distinct power outage events, averaging 2.3 hours per event.
The single worst outage on record in Walla Walla County started November 7, 2017, lasting 6 hours and leaving up to 16,800 customers without power (55% of the county) at its peak.
September has historically been the worst month for outages in Walla Walla County, with 41 events recorded during that month across the dataset.
Based on this history, Walla Walla County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Walla Walla County's outage profile
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Walla Walla County.
| County | Grade | National percentile |
|---|---|---|
| Whitman County | B | 78th |
| Yakima County | B | 80th |
| Snohomish County | B | 70th |
| Spokane County | B | 69th |
| Douglas County | A | 82nd |
FAQ
How often does power go out in Walla Walla County?
Between 2017 and 2025, Walla Walla County recorded 266 outage events, averaging 2.3 hours each.
What is Walla Walla County's reliability grade?
Walla Walla County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Walla Walla County?
The worst outage on record started November 7, 2017, lasting 6 hours and affecting up to 16,800 customers.