Silver Bow County Power Outage History
2020–2025 · Montana
Top 20% most reliable nationally — infrequent, short outages. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Jun 13, 2020 | 11 hrs | 7,121 (29%) | Heavy Snow |
| May 29, 2020 | 1 hrs | 6,874 (28%) | Unnamed event |
| May 28, 2020 | 1 hrs | 6,874 (28%) | Unnamed event |
| Dec 17, 2025 | 3 hrs | 6,355 (26%) | High Wind |
| Jul 20, 2021 | 4 hrs | 5,468 (22%) | Unnamed event |
Over the 6 years from 2020 to 2025, Silver Bow County recorded 142 distinct power outage events, averaging 3.1 hours per event.
The single worst outage on record in Silver Bow County started June 13, 2020 (Heavy Snow), lasting 11 hours and leaving up to 7,121 customers without power (29% of the county) at its peak.
June has historically been the worst month for outages in Silver Bow County, with 24 events recorded during that month across the dataset.
Based on this history, Silver Bow County earns a Reliability Grade of A, placing it in the 89th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Silver Bow County's outage profile
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Similar counties in Montana
Counties with the closest reliability grade and national percentile to Silver Bow County.
| County | Grade | National percentile |
|---|---|---|
| Yellowstone County | A | 89th |
| Stillwater County | A | 90th |
| Custer County | A | 87th |
| Gallatin County | A | 92nd |
| Dawson County | A | 93rd |
FAQ
How often does power go out in Silver Bow County?
Between 2020 and 2025, Silver Bow County recorded 142 outage events, averaging 3.1 hours each.
What is Silver Bow County's reliability grade?
Silver Bow County has a Reliability Grade of A, in the 89th national percentile.
What was the worst power outage in Silver Bow County?
The worst outage on record started June 13, 2020 (Heavy Snow), lasting 11 hours and affecting up to 7,121 customers.