Umatilla County Power Outage History
2017–2025 · Oregon
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 |
|---|---|---|---|
| May 23, 2019 | 1 hrs | 14,054 (29%) | Unnamed event |
| May 23, 2019 | 2 hrs | 14,027 (29%) | Unnamed event |
| Jul 16, 2018 | 14 hrs | 13,365 (27%) | Unnamed event |
| Feb 17, 2018 | 3 hrs | 12,763 (26%) | Heavy Snow |
| Aug 9, 2021 | 2 hrs | 12,339 (25%) | Unnamed event |
Over the 9 years from 2017 to 2025, Umatilla County recorded 530 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Umatilla County started May 23, 2019, lasting 1 hours and leaving up to 14,054 customers without power (29% of the county) at its peak.
July has historically been the worst month for outages in Umatilla County, with 68 events recorded during that month across the dataset.
Based on this history, Umatilla County earns a Reliability Grade of B, placing it in the 73rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Umatilla County's outage profile
See more picks in our Best Small Power Stations (Under 1,000Wh) roundup.
Outage-prep kit
See our outage-prep guides.
Similar counties in Oregon
Counties with the closest reliability grade and national percentile to Umatilla County.
| County | Grade | National percentile |
|---|---|---|
| Union County | B | 74th |
| Gilliam County | B | 77th |
| Grant County | B | 70th |
| Lake County | B | 68th |
| Morrow County | A | 81st |
FAQ
How often does power go out in Umatilla County?
Between 2017 and 2025, Umatilla County recorded 530 outage events, averaging 2.4 hours each.
What is Umatilla County's reliability grade?
Umatilla County has a Reliability Grade of B, in the 73rd national percentile.
What was the worst power outage in Umatilla County?
The worst outage on record started May 23, 2019, lasting 1 hours and affecting up to 14,054 customers.