Fremont County Power Outage History
2017–2025 · Wyoming
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 |
|---|---|---|---|
| Aug 13, 2017 | 4 hrs | 6,819 (25%) | Unnamed event |
| Jul 11, 2025 | 2 hrs | 5,383 (20%) | Thunderstorm Wind |
| Aug 15, 2023 | 2 hrs | 5,370 (20%) | Unnamed event |
| Jul 2, 2021 | 4 hrs | 5,307 (20%) | Unnamed event |
| Aug 20, 2020 | 0 hrs | 5,264 (20%) | Unnamed event |
Over the 9 years from 2017 to 2025, Fremont County recorded 145 distinct power outage events, averaging 1.9 hours per event.
The single worst outage on record in Fremont County started August 13, 2017, lasting 4 hours and leaving up to 6,819 customers without power (25% of the county) at its peak.
August has historically been the worst month for outages in Fremont County, with 23 events recorded during that month across the dataset.
Based on this history, Fremont County earns a Reliability Grade of A, placing it in the 94th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Fremont County's outage profile
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Similar counties in Wyoming
Counties with the closest reliability grade and national percentile to Fremont County.
| County | Grade | National percentile |
|---|---|---|
| Niobrara County | A | 93rd |
| Laramie County | A | 93rd |
| Uinta County | A | 93rd |
| Teton County | A | 97th |
| Washakie County | A | 90th |
FAQ
How often does power go out in Fremont County?
Between 2017 and 2025, Fremont County recorded 145 outage events, averaging 1.9 hours each.
What is Fremont County's reliability grade?
Fremont County has a Reliability Grade of A, in the 94th national percentile.
What was the worst power outage in Fremont County?
The worst outage on record started August 13, 2017, lasting 4 hours and affecting up to 6,819 customers.