Salt Lake CountyPower Outage History
What this grade means
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 |
|---|---|---|---|
| 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 |
Was There an Outage on a Specific Date?
Pick a date to see whether a power outage was recorded for Salt Lake County, Utah that day.
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).
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 |
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 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.