Lewis County Power Outage History
2014–2025 · Idaho
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 |
|---|---|---|---|
| Aug 29, 2015 | 33 hrs | 11,126 (99%) | Wildfire |
| Oct 26, 2015 | 5 hrs | 8,347 (74%) | Unnamed event |
| Jun 2, 2015 | 6 hrs | 2,129 (19%) | Hail |
| Aug 30, 2017 | 13 hrs | 1,998 (18%) | Thunderstorm Wind |
| May 22, 2015 | 3 hrs | 1,981 (18%) | Unnamed event |
Over the 12 years from 2014 to 2025, Lewis County recorded 539 distinct power outage events, averaging 3.6 hours per event.
The single worst outage on record in Lewis County started August 29, 2015 (Wildfire), lasting 33 hours and leaving up to 11,126 customers without power (99% of the county) at its peak.
September has historically been the worst month for outages in Lewis County, with 61 events recorded during that month across the dataset.
Based on this history, Lewis County earns a Reliability Grade of B, placing it in the 73rd percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lewis County's outage profile
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Outage-prep kit
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Similar counties in Idaho
Counties with the closest reliability grade and national percentile to Lewis County.
| County | Grade | National percentile |
|---|---|---|
| Madison County | B | 72nd |
| Gem County | B | 72nd |
| Teton County | B | 78th |
| Washington County | B | 68th |
| Bannock County | A | 81st |
FAQ
How often does power go out in Lewis County?
Between 2014 and 2025, Lewis County recorded 539 outage events, averaging 3.6 hours each.
What is Lewis County's reliability grade?
Lewis County has a Reliability Grade of B, in the 73rd national percentile.
What was the worst power outage in Lewis County?
The worst outage on record started August 29, 2015 (Wildfire), lasting 33 hours and affecting up to 11,126 customers.