County annual report · FIPS 49035
2021 Salt Lake County, UT Power Outage Report
In 2021, customers in Salt Lake County, UT went without power for an average of 2.5 hours, a total of 1.2M customer-hours (Utah average 2.6 hours). That ranks 17th worst of 25 Utah counties and 2054th 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 Salt Lake 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 | October 3, 2021 11:15 | October 5, 2021 06:30 | 1d 19h | 22,470 | 25K |
| 2 | November 10, 2021 14:45 | November 11, 2021 07:30 | 16h 45m | 13,290 | 6,541 |
| 3 | February 16, 2021 10:45 | February 17, 2021 07:45 | 21h | 11,753 | 4,615 |
| 4 | July 21, 2021 12:30 | July 24, 2021 10:15 | 2d 21h | 8,366 | 60K |
| 5 | October 19, 2021 09:00 | October 20, 2021 07:00 | 22h | 7,985 | 21K |
| 6 | December 14, 2021 07:00 | December 20, 2021 05:00 | 5d 22h | 7,805 | 77K |
| 7 | February 10, 2021 11:00 | February 11, 2021 08:45 | 21h 45m | 7,522 | 6,974 |
| 8 | May 22, 2021 10:45 | May 26, 2021 09:45 | 3d 23h | 7,087 | 33K |
| 9 | July 1, 2021 12:00 | July 6, 2021 12:45 | 5d | 6,906 | 37K |
| 10 | December 26, 2021 09:45 | December 29, 2021 10:15 | 3d | 6,476 | 19K |
Outage episodes by size in 2021: 232 reached 100+ customers, 97 reached 1,000+ customers, 3 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 Salt Lake 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| City of Murray - (UT) | - | - | - | - | - |
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 ÷ 494,047 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. Salt Lake County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Salt Lake 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/salt-lake-county