Whitman County Power Outage History
2014–2025 · 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 18, 2015 | 2 hrs | 16,959 (36%) | High Wind |
| Nov 18, 2015 | 1 hrs | 16,958 (36%) | High Wind |
| Nov 18, 2015 | 2 hrs | 16,935 (36%) | High Wind |
| Nov 18, 2015 | 9 hrs | 14,986 (32%) | High Wind |
| Nov 18, 2015 | 1 hrs | 10,878 (23%) | High Wind |
Over the 12 years from 2014 to 2025, Whitman County recorded 365 distinct power outage events, averaging 3.0 hours per event.
The single worst outage on record in Whitman County started November 18, 2015 (High Wind), lasting 2 hours and leaving up to 16,959 customers without power (36% of the county) at its peak.
November has historically been the worst month for outages in Whitman County, with 52 events recorded during that month across the dataset.
Based on this history, Whitman County earns a Reliability Grade of B, placing it in the 78th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Whitman County's outage profile
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Whitman County.
| County | Grade | National percentile |
|---|---|---|
| Yakima County | B | 80th |
| Walla Walla County | B | 76th |
| Douglas County | A | 82nd |
| Chelan County | A | 83rd |
| Asotin County | A | 84th |
FAQ
How often does power go out in Whitman County?
Between 2014 and 2025, Whitman County recorded 365 outage events, averaging 3.0 hours each.
What is Whitman County's reliability grade?
Whitman County has a Reliability Grade of B, in the 78th national percentile.
What was the worst power outage in Whitman County?
The worst outage on record started November 18, 2015 (High Wind), lasting 2 hours and affecting up to 16,959 customers.