Valley County Power Outage History
2015–2025 · Idaho
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Mar 15, 2023 | 2 hrs | 10,754 (100%) | Heavy Rain |
| Apr 18, 2023 | 4 hrs | 10,588 (98%) | Unnamed event |
| Aug 18, 2020 | 4 hrs | 9,712 (90%) | Unnamed event |
| Jun 7, 2020 | 3 hrs | 8,876 (83%) | Unnamed event |
| Dec 17, 2025 | 133 hrs | 8,046 (75%) | Thunderstorm Wind |
Over the 11 years from 2015 to 2025, Valley County recorded 766 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Valley County started March 15, 2023 (Heavy Rain), lasting 2 hours and leaving up to 10,754 customers without power (100% of the county) at its peak.
July has historically been the worst month for outages in Valley County, with 86 events recorded during that month across the dataset.
Based on this history, Valley County earns a Reliability Grade of D, placing it in the 32nd percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Valley County.
| County | Grade | National percentile |
|---|---|---|
| Latah County | D | 34th |
| Butte County | D | 27th |
| Adams County | D | 27th |
| Blaine County | D | 39th |
| Clark County | D | 39th |
FAQ
How often does power go out in Valley County?
Between 2015 and 2025, Valley County recorded 766 outage events, averaging 3.3 hours each.
What is Valley County's reliability grade?
Valley County has a Reliability Grade of D, in the 32nd national percentile.
What was the worst power outage in Valley County?
The worst outage on record started March 15, 2023 (Heavy Rain), lasting 2 hours and affecting up to 10,754 customers.