Summit County Power Outage History
2017–2025 · Utah
Worse than average — more frequent or longer 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 |
|---|---|---|---|
| Jul 10, 2025 | 4 hrs | 5,659 (30%) | Unnamed event |
| Aug 16, 2023 | 1 hrs | 4,674 (25%) | Unnamed event |
| Jul 19, 2025 | 4 hrs | 4,650 (25%) | Unnamed event |
| Dec 28, 2022 | 2 hrs | 4,461 (24%) | High Wind |
| Jul 1, 2020 | 4 hrs | 3,699 (20%) | Unnamed event |
Over the 9 years from 2017 to 2025, Summit County recorded 770 distinct power outage events, averaging 3.0 hours per event.
The single worst outage on record in Summit County started July 10, 2025, lasting 4 hours and leaving up to 5,659 customers without power (30% of the county) at its peak.
August has historically been the worst month for outages in Summit County, with 108 events recorded during that month across the dataset.
Based on this history, Summit County earns a Reliability Grade of D, placing it in the 36th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Utah
Counties with the closest reliability grade and national percentile to Summit County.
| County | Grade | National percentile |
|---|---|---|
| Beaver County | D | 34th |
| Piute County | D | 39th |
| Weber County | C | 47th |
| Morgan County | D | 25th |
| Grand County | C | 58th |
FAQ
How often does power go out in Summit County?
Between 2017 and 2025, Summit County recorded 770 outage events, averaging 3.0 hours each.
What is Summit County's reliability grade?
Summit County has a Reliability Grade of D, in the 36th national percentile.
What was the worst power outage in Summit County?
The worst outage on record started July 10, 2025, lasting 4 hours and affecting up to 5,659 customers.