Lewis CountyPower Outage History
What this grade means
Better than average — fewer or shorter outages than most counties. This county's outage history is better than the national median: recorded outages are less frequent and/or shorter in duration than a typical US county experienced over the same 12-year period. It isn't in the top tier nationally, but its track record points to lower-than-average outage risk.
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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Lewis County, Idaho that day.
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).
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 |
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 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.