Lake County Power Outage History
2014–2025 · 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 |
|---|---|---|---|
| Dec 17, 2025 | 79 hrs | 5,323 (19%) | Strong Wind |
| Aug 24, 2024 | 17 hrs | 3,412 (12%) | Hail |
| Jul 30, 2024 | 1 hrs | 3,193 (12%) | Heat |
| Jul 2, 2024 | 1 hrs | 3,183 (12%) | Unnamed event |
| May 20, 2024 | 2 hrs | 3,176 (12%) | High Wind |
Over the 12 years from 2014 to 2025, Lake County recorded 158 distinct power outage events, averaging 4.4 hours per event.
The single worst outage on record in Lake County started December 17, 2025 (Strong Wind), lasting 79 hours and leaving up to 5,323 customers without power (19% of the county) at its peak.
November has historically been the worst month for outages in Lake County, with 26 events recorded during that month across the dataset.
Based on this history, Lake County earns a Reliability Grade of A, placing it in the 80th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Lake 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 Lake County.
| County | Grade | National percentile |
|---|---|---|
| Daniels County | A | 81st |
| Broadwater County | A | 81st |
| Fergus County | A | 82nd |
| Rosebud County | B | 78th |
| Jefferson County | B | 77th |
FAQ
How often does power go out in Lake County?
Between 2014 and 2025, Lake County recorded 158 outage events, averaging 4.4 hours each.
What is Lake County's reliability grade?
Lake County has a Reliability Grade of A, in the 80th national percentile.
What was the worst power outage in Lake County?
The worst outage on record started December 17, 2025 (Strong Wind), lasting 79 hours and affecting up to 5,323 customers.