Salt Lake County Power Outage History
2017–2025 · Utah
Better than average — fewer or shorter outages than most counties. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Sep 8, 2020 | 185 hrs | 91,704 (18%) | Unnamed event |
| Mar 18, 2020 | 15 hrs | 58,592 (12%) | Unnamed event |
| Jun 28, 2020 | 8 hrs | 22,775 (5%) | Thunderstorm Wind |
| Nov 7, 2022 | 5 hrs | 22,485 (4%) | High Wind |
| Oct 3, 2021 | 3 hrs | 22,470 (4%) | Unnamed event |
Over the 9 years from 2017 to 2025, Salt Lake County recorded 3,567 distinct power outage events, averaging 2.5 hours per event.
The single worst outage on record in Salt Lake County started September 8, 2020, lasting 185 hours and leaving up to 91,704 customers without power (18% of the county) at its peak.
July has historically been the worst month for outages in Salt Lake County, with 428 events recorded during that month across the dataset.
Based on this history, Salt Lake County earns a Reliability Grade of B, placing it in the 70th percentile nationally for grid reliability (higher percentile = more reliable).
Sized for Salt Lake County's outage profile
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Outage-prep kit
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Similar counties in Utah
Counties with the closest reliability grade and national percentile to Salt Lake County.
| County | Grade | National percentile |
|---|---|---|
| Tooele County | B | 70th |
| Carbon County | B | 70th |
| Juab County | B | 71st |
| Emery County | B | 72nd |
| Sevier County | B | 72nd |
FAQ
How often does power go out in Salt Lake County?
Between 2017 and 2025, Salt Lake County recorded 3,567 outage events, averaging 2.5 hours each.
What is Salt Lake County's reliability grade?
Salt Lake County has a Reliability Grade of B, in the 70th national percentile.
What was the worst power outage in Salt Lake County?
The worst outage on record started September 8, 2020, lasting 185 hours and affecting up to 91,704 customers.