Sweetwater 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 |
|---|---|---|---|
| Sep 12, 2017 | 2 hrs | 13,823 (54%) | Unnamed event |
| Sep 15, 2017 | 2 hrs | 11,836 (46%) | Unnamed event |
| Dec 31, 2022 | 1 hrs | 10,627 (41%) | High Wind |
| Sep 8, 2020 | 50 hrs | 6,789 (26%) | Heat |
| Jul 11, 2018 | 1 hrs | 6,095 (24%) | Unnamed event |
Over the 9 years from 2017 to 2025, Sweetwater County recorded 215 distinct power outage events, averaging 2.4 hours per event.
The single worst outage on record in Sweetwater County started September 12, 2017, lasting 2 hours and leaving up to 13,823 customers without power (54% of the county) at its peak.
July has historically been the worst month for outages in Sweetwater County, with 34 events recorded during that month across the dataset.
Based on this history, Sweetwater County earns a Reliability Grade of A, placing it in the 81st percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Sweetwater County's outage profile
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Similar counties in Wyoming
Counties with the closest reliability grade and national percentile to Sweetwater County.
| County | Grade | National percentile |
|---|---|---|
| Sheridan County | A | 82nd |
| Big Horn County | A | 82nd |
| Campbell County | B | 80th |
| Natrona County | A | 87th |
| Park County | A | 88th |
FAQ
How often does power go out in Sweetwater County?
Between 2017 and 2025, Sweetwater County recorded 215 outage events, averaging 2.4 hours each.
What is Sweetwater County's reliability grade?
Sweetwater County has a Reliability Grade of A, in the 81st national percentile.
What was the worst power outage in Sweetwater County?
The worst outage on record started September 12, 2017, lasting 2 hours and affecting up to 13,823 customers.