Carbon CountyPower Outage History
What this grade means
(How grades are calculated)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 |
|---|---|---|---|
| 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Carbon County, Montana that day.
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).
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 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.