Valley CountyPower Outage History
What this grade means
Worse than average — more frequent or longer outages than most counties. This county's recorded history shows more frequent outages and/or longer restoration times than most US counties over the same 12-year period. If you live here, it's worth taking backup power more seriously than an average household would.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Valley County, Idaho that day.
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).
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 |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
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.