County annual report · FIPS 49043
2021 Summit County, UT Power Outage Report
In 2021, customers in Summit County, UT went without power for an average of 6.1 hours, a total of 111K customer-hours (Utah average 2.6 hours). That ranks 8th worst of 25 Utah counties and 1129th of 2,974 nationally.
Compared with UT, the US and 2020
Coverage line is EAGLE-I's share of Utah customers tracked each year.
Biggest outages in Summit County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 14, 2021 21:00 | August 15, 2021 06:15 | 9h 15m | 3,676 | 2,995 |
| 2 | September 9, 2021 15:15 | September 9, 2021 23:45 | 8h 30m | 2,780 | 2,477 |
| 3 | August 20, 2021 15:00 | August 21, 2021 06:30 | 15h 30m | 2,528 | 6,204 |
| 4 | July 28, 2021 15:15 | July 29, 2021 02:15 | 11h | 1,919 | 2,252 |
| 5 | August 26, 2021 02:00 | August 27, 2021 12:45 | 1d 10h | 1,896 | 5,563 |
| 6 | June 7, 2021 12:15 | June 8, 2021 05:30 | 17h 15m | 1,335 | 1,382 |
| 7 | October 12, 2021 01:00 | October 13, 2021 02:00 | 1d 1h | 1,315 | 4,790 |
| 8 | November 23, 2021 02:00 | November 23, 2021 04:45 | 2h 45m | 1,312 | 3,608 |
| 9 | September 8, 2021 15:15 | September 8, 2021 22:45 | 7h 30m | 1,200 | 1,924 |
| 10 | May 19, 2021 17:00 | May 20, 2021 01:45 | 8h 45m | 915 | 1,067 |
Outage episodes by size in 2021: 63 reached 100+ customers, 9 reached 1,000+ customers, 0 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Summit County reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| PacifiCorp | 2021 | 4.3 hrs | 1.86 | 2.0 hrs | 1.19 |
| Bridger Valley Elec Assn, Inc | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 79% of Utah's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 18,106 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Summit County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Summit County, UT annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/utah/summit-county