County annual report · FIPS 49035
2018 Salt Lake County, UT Power Outage Report
In 2018, customers in Salt Lake County, UT went without power for an average of 2.2 hours, a total of 1.1M customer-hours (Utah average 1.9 hours). That ranks 17th worst of 26 Utah counties and 1778th of 2,798 nationally.
Compared with UT, the US and 2017
Coverage line is EAGLE-I's share of Utah customers tracked each year.
Biggest outages in Salt Lake County, 2018
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 9, 2018 19:30 | April 10, 2018 09:45 | 14h 15m | 15,378 | 8,819 |
| 2 | August 19, 2018 05:15 | August 20, 2018 08:15 | 1d 3h | 15,246 | 86K |
| 3 | October 8, 2018 04:45 | October 15, 2018 01:15 | 6d 20h | 9,882 | 35K |
| 4 | April 16, 2018 13:30 | April 18, 2018 09:30 | 1d 20h | 7,621 | 32K |
| 5 | April 30, 2018 05:00 | May 1, 2018 06:15 | 1d 1h | 7,521 | 3,886 |
| 6 | February 18, 2018 12:15 | February 20, 2018 21:15 | 2d 9h | 7,214 | 50K |
| 7 | September 15, 2018 15:30 | September 17, 2018 05:15 | 1d 13h | 6,071 | 20K |
| 8 | May 16, 2018 11:45 | May 18, 2018 11:00 | 1d 23h | 5,908 | 15K |
| 9 | March 1, 2018 12:15 | March 3, 2018 22:00 | 2d 9h | 5,828 | 31K |
| 10 | September 21, 2018 13:45 | September 22, 2018 08:45 | 19h | 5,735 | 7,820 |
Outage episodes by size in 2018: 244 reached 100+ customers, 87 reached 1,000+ customers, 2 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 2018, 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 | 2018 | 3.2 hrs | 1.62 | 2.0 hrs | 1.25 |
| 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 80% of Utah's customers in 2018; 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, 2018, 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/2018/utah/salt-lake-county