Chelan County Power Outage History
2019–2025 · 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 10, 2025 | 80 hrs | 14,176 (28%) | Flood |
| Dec 17, 2025 | 2 hrs | 6,972 (14%) | Flood |
| Dec 26, 2024 | 5 hrs | 5,884 (12%) | Heavy Snow |
| May 8, 2024 | 1 hrs | 4,427 (9%) | Unnamed event |
| Sep 9, 2025 | 11 hrs | 3,834 (8%) | Wildfire |
Over the 7 years from 2019 to 2025, Chelan County recorded 143 distinct power outage events, averaging 2.9 hours per event.
The single worst outage on record in Chelan County started December 10, 2025 (Flood), lasting 80 hours and leaving up to 14,176 customers without power (28% of the county) at its peak.
July has historically been the worst month for outages in Chelan County, with 24 events recorded during that month across the dataset.
Based on this history, Chelan County earns a Reliability Grade of A, placing it in the 83rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Chelan County's outage profile
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Similar counties in Washington
Counties with the closest reliability grade and national percentile to Chelan County.
| County | Grade | National percentile |
|---|---|---|
| Asotin County | A | 84th |
| Douglas County | A | 82nd |
| Clark County | A | 85th |
| Yakima County | B | 80th |
| Whitman County | B | 78th |
FAQ
How often does power go out in Chelan County?
Between 2019 and 2025, Chelan County recorded 143 outage events, averaging 2.9 hours each.
What is Chelan County's reliability grade?
Chelan County has a Reliability Grade of A, in the 83rd national percentile.
What was the worst power outage in Chelan County?
The worst outage on record started December 10, 2025 (Flood), lasting 80 hours and affecting up to 14,176 customers.