Boise County Power Outage History
2015–2025 · Idaho
Bottom 20% least reliable nationally — frequent and/or long outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 16, 2021 | 1 hrs | 11,045 (100%) | Unnamed event |
| Jul 24, 2024 | 24 hrs | 9,796 (89%) | Unnamed event |
| Jan 16, 2024 | 5 hrs | 5,093 (46%) | Heavy Snow |
| May 13, 2022 | 7 hrs | 4,970 (45%) | Unnamed event |
| Oct 27, 2021 | 2 hrs | 4,647 (42%) | Unnamed event |
Over the 11 years from 2015 to 2025, Boise County recorded 686 distinct power outage events, averaging 4.4 hours per event.
The single worst outage on record in Boise County started September 16, 2021, lasting 1 hours and leaving up to 11,045 customers without power (100% of the county) at its peak.
December has historically been the worst month for outages in Boise County, with 69 events recorded during that month across the dataset.
Based on this history, Boise County earns a Reliability Grade of F, placing it in the 14th 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 Boise County.
| County | Grade | National percentile |
|---|---|---|
| Benewah County | F | 17th |
| Boundary County | F | 17th |
| Idaho County | F | 17th |
| Bonner County | F | 10th |
| Shoshone County | D | 21st |
FAQ
How often does power go out in Boise County?
Between 2015 and 2025, Boise County recorded 686 outage events, averaging 4.4 hours each.
What is Boise County's reliability grade?
Boise County has a Reliability Grade of F, in the 14th national percentile.
What was the worst power outage in Boise County?
The worst outage on record started September 16, 2021, lasting 1 hours and affecting up to 11,045 customers.