Clark CountyPower Outage History
2017–2025 · Idaho
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 |
|---|---|---|---|
| Dec 29, 2020 | 2 hrs | 560 (81%) | Unnamed event |
| Sep 16, 2023 | 3 hrs | 560 (81%) | Unnamed event |
| Nov 14, 2020 | 2 hrs | 559 (81%) | Heavy Snow |
| Jul 20, 2023 | <1 hr | 557 (81%) | Unnamed event |
| Dec 16, 2018 | 2 hrs | 547 (79%) | Unnamed event |
Over the 9 years from 2017 to 2025, Clark County recorded 185 distinct power outage events, averaging 3.2 hours per event.
The single worst outage on record in Clark County started December 29, 2020, lasting 2 hours and leaving up to 560 customers without power (81% of the county) at its peak.
July has historically been the worst month for outages in Clark County, with 33 events recorded during that month across the dataset.
Based on this history, Clark County earns a Reliability Grade of D, placing it in the 39th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Clark County's outage profile
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Read our mission →Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Clark County.
| County | Grade | National percentile |
|---|---|---|
| Blaine County | D | 39th |
| Gooding County | C | 43rd |
| Lemhi County | C | 43rd |
| Latah County | D | 34th |
| Valley County | D | 32nd |
Most reliable counties in Idaho
The top 3 counties in Idaho by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Minidoka County | A | 95th |
| Camas County | A | 92nd |
| Ada County | A | 92nd |
Least reliable counties in Idaho
The bottom 3 counties in Idaho by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Clearwater County | F | 3rd |
| Bonner County | F | 10th |
| Boise County | F | 14th |
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 Clark County?
Between 2017 and 2025, Clark County recorded 185 outage events, averaging 3.2 hours each.
What is Clark County's reliability grade?
Clark County has a Reliability Grade of D, in the 39th national percentile.
What was the worst power outage in Clark County?
The worst outage on record started December 29, 2020, lasting 2 hours and affecting up to 560 customers.