Carbon CountyPower Outage History
2019–2025 · Montana
Better than average — fewer or shorter outages than most counties.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 3, 2024 | 6 hrs | 3,383 (51%) | Thunderstorm Wind |
| Sep 22, 2023 | 3 hrs | 2,789 (42%) | Unnamed event |
| Jun 13, 2022 | 35 hrs | 2,575 (39%) | Flood |
| Jun 26, 2023 | 2 hrs | 1,900 (29%) | Flash Flood |
| Jun 14, 2024 | 4 hrs | 1,648 (25%) | Thunderstorm Wind |
Over the 7 years from 2019 to 2025, Carbon County recorded 235 distinct power outage events, averaging 3.3 hours per event.
The single worst outage on record in Carbon County started September 3, 2024 (Thunderstorm Wind), lasting 6 hours and leaving up to 3,383 customers without power (51% of the county) at its peak.
May has historically been the worst month for outages in Carbon County, with 36 events recorded during that month across the dataset.
Based on this history, Carbon County earns a Reliability Grade of B, placing it in the 61st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Carbon County's outage profile
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Outage-prep kit
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Carbon County.
| County | Grade | National percentile |
|---|---|---|
| Musselshell County | B | 61st |
| Golden Valley County | C | 58th |
| Blaine County | B | 64th |
| Park County | B | 66th |
| Powell County | C | 55th |
Most reliable counties in Montana
The top 3 counties in Montana by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Powder River County | A | 95th |
| Roosevelt County | A | 94th |
| Fallon County | A | 94th |
Least reliable counties in Montana
The bottom 3 counties in Montana by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Lincoln County | F | 14th |
| Sanders County | D | 20th |
| Madison County | D | 31st |
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 Carbon County?
Between 2019 and 2025, Carbon County recorded 235 outage events, averaging 3.3 hours each.
What is Carbon County's reliability grade?
Carbon County has a Reliability Grade of B, in the 61st national percentile.
What was the worst power outage in Carbon County?
The worst outage on record started September 3, 2024 (Thunderstorm Wind), lasting 6 hours and affecting up to 3,383 customers.