Fallon CountyPower Outage History
2017–2025 · Montana
Top 20% most reliable nationally — infrequent, short outages. This county ranks in the most reliable fifth of all US counties in our dataset, based on 12 years of real DOE outage records: outages happen less often here, and when they do occur they tend to be resolved quickly compared to the rest of the country. Baseline outage risk is low, though a severe local storm can still occasionally cause a longer-than-usual outage regardless of the long-term track record.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 28, 2021 | <1 hr | 1,179 (52%) | Unnamed event |
| Jun 9, 2021 | 25 hrs | 623 (27%) | Thunderstorm Wind |
| Jul 8, 2020 | 10 hrs | 457 (20%) | Thunderstorm Wind |
| Jun 1, 2020 | <1 hr | 456 (20%) | Unnamed event |
| Nov 23, 2024 | 2 hrs | 447 (20%) | High Wind |
Over the 9 years from 2017 to 2025, Fallon County recorded 79 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Fallon County started September 28, 2021, lasting less than 1 hour and leaving up to 1,179 customers without power (52% of the county) at its peak.
July has historically been the worst month for outages in Fallon County, with 15 events recorded during that month across the dataset.
Based on this history, Fallon County earns a Reliability Grade of A, placing it in the 94th percentile nationally for grid reliability (higher percentile = more reliable).
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Read our mission →Similar counties in Montana
Counties with the closest reliability grade and national percentile to Fallon County.
| County | Grade | National percentile |
|---|---|---|
| Roosevelt County | A | 94th |
| Big Horn County | A | 94th |
| Powder River County | A | 95th |
| Dawson County | A | 93rd |
| Gallatin County | A | 92nd |
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 Fallon County?
Between 2017 and 2025, Fallon County recorded 79 outage events, averaging 2.5 hours each.
What is Fallon County's reliability grade?
Fallon County has a Reliability Grade of A, in the 94th national percentile.
What was the worst power outage in Fallon County?
The worst outage on record started September 28, 2021, lasting less than 1 hour and affecting up to 1,179 customers.