Pondera CountyPower Outage History
2019–2025 · Montana
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 |
|---|---|---|---|
| Dec 25, 2020 | 3 hrs | 2,497 (75%) | Unnamed event |
| Jun 12, 2020 | 8 hrs | 1,988 (60%) | Unnamed event |
| Sep 12, 2024 | 6 hrs | 1,739 (53%) | Unnamed event |
| Jun 18, 2020 | 3 hrs | 1,453 (44%) | Unnamed event |
| Mar 31, 2021 | 2 hrs | 1,186 (36%) | Unnamed event |
Over the 7 years from 2019 to 2025, Pondera County recorded 178 distinct power outage events, averaging 2.8 hours per event.
The single worst outage on record in Pondera County started December 25, 2020, lasting 3 hours and leaving up to 2,497 customers without power (75% of the county) at its peak.
August has historically been the worst month for outages in Pondera County, with 23 events recorded during that month across the dataset.
Based on this history, Pondera County earns a Reliability Grade of B, placing it in the 76th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Pondera County's outage profile
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Read our mission →Similar counties in Montana
Counties with the closest reliability grade and national percentile to Pondera County.
| County | Grade | National percentile |
|---|---|---|
| Sheridan County | B | 75th |
| Jefferson County | B | 77th |
| Rosebud County | B | 78th |
| Lewis and Clark County | B | 73rd |
| Lake County | A | 80th |
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 Pondera County?
Between 2019 and 2025, Pondera County recorded 178 outage events, averaging 2.8 hours each.
What is Pondera County's reliability grade?
Pondera County has a Reliability Grade of B, in the 76th national percentile.
What was the worst power outage in Pondera County?
The worst outage on record started December 25, 2020, lasting 3 hours and affecting up to 2,497 customers.