County annual report · FIPS 49045
2021 Tooele County, UT Power Outage Report
In 2021, customers in Tooele County, UT went without power for an average of 3.7 hours, a total of 107K customer-hours (Utah average 2.6 hours). That ranks 12th worst of 25 Utah counties and 1618th 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 Tooele 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 | April 19, 2021 01:15 | April 19, 2021 06:00 | 4h 45m | 4,742 | 8,291 |
| 2 | July 12, 2021 01:15 | July 12, 2021 08:15 | 7h | 4,725 | 14K |
| 3 | November 16, 2021 18:45 | November 16, 2021 19:00 | 15m | 3,425 | 856 |
| 4 | February 16, 2021 03:30 | February 16, 2021 14:30 | 11h | 2,998 | 9,261 |
| 5 | October 24, 2021 23:00 | October 24, 2021 23:15 | 15m | 2,726 | 682 |
| 6 | December 6, 2021 16:30 | December 7, 2021 07:00 | 14h 30m | 2,500 | 2,139 |
| 7 | January 2, 2021 04:45 | January 2, 2021 14:45 | 10h | 2,376 | 5,294 |
| 8 | October 25, 2021 00:15 | October 26, 2021 13:15 | 1d 13h | 2,135 | 8,332 |
| 9 | December 14, 2021 02:15 | December 17, 2021 06:30 | 3d 4h | 1,918 | 9,950 |
| 10 | September 10, 2021 20:30 | September 11, 2021 05:15 | 8h 45m | 1,624 | 1,230 |
Outage episodes by size in 2021: 40 reached 100+ customers, 17 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 Tooele 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 |
| Mt Wheeler Power, Inc | - | - | - | - | - |
| Wells Rural Electric Co | - | - | - | - | - |
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 ÷ 28,885 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. Tooele County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Tooele 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/tooele-county