Cowlitz County Power Outage History
2018–2025 · Washington
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Dec 17, 2025 | 22 hrs | 12,176 (23%) | Unnamed event |
| Apr 25, 2024 | 2 hrs | 7,598 (14%) | Unnamed event |
| Jan 9, 2024 | 10 hrs | 7,479 (14%) | Unnamed event |
| Apr 25, 2024 | 1 hrs | 5,461 (10%) | Unnamed event |
| Dec 26, 2024 | 20 hrs | 5,113 (10%) | Heavy Snow |
Over the 8 years from 2018 to 2025, Cowlitz County recorded 191 distinct power outage events, averaging 2.7 hours per event.
The single worst outage on record in Cowlitz County started December 17, 2025, lasting 22 hours and leaving up to 12,176 customers without power (23% of the county) at its peak.
December has historically been the worst month for outages in Cowlitz County, with 30 events recorded during that month across the dataset.
Based on this history, Cowlitz County earns a Reliability Grade of A, placing it in the 92nd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Cowlitz County's outage profile
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Cowlitz County.
| County | Grade | National percentile |
|---|---|---|
| Adams County | A | 91st |
| Benton County | A | 95th |
| Okanogan County | A | 97th |
| Franklin County | A | 98th |
| Grant County | A | 99th |
FAQ
How often does power go out in Cowlitz County?
Between 2018 and 2025, Cowlitz County recorded 191 outage events, averaging 2.7 hours each.
What is Cowlitz County's reliability grade?
Cowlitz County has a Reliability Grade of A, in the 92nd national percentile.
What was the worst power outage in Cowlitz County?
The worst outage on record started December 17, 2025, lasting 22 hours and affecting up to 12,176 customers.