County annual report · FIPS 47173
2018 Union County, TN Power Outage Report
In 2018, customers in Union County, TN went without power for an average of 11.2 hours, a total of 107K customer-hours (Tennessee average 2.1 hours). That ranks 1st worst of 71 Tennessee counties and 489th of 2,798 nationally.
Compared with TN, the US and 2017
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Union 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 | July 20, 2018 20:45 | July 22, 2018 02:15 | 1d 5h | 8,546 | 38K |
| 2 | August 8, 2018 19:45 | August 9, 2018 05:45 | 10h | 4,257 | 5,353 |
| 3 | November 6, 2018 09:00 | November 6, 2018 21:00 | 12h | 3,084 | 4,127 |
| 4 | March 8, 2018 22:30 | March 8, 2018 23:00 | 30m | 1,799 | 694 |
| 5 | May 31, 2018 22:45 | June 1, 2018 18:00 | 19h 15m | 1,494 | 8,920 |
| 6 | June 26, 2018 21:00 | June 27, 2018 05:45 | 8h 45m | 1,283 | 4,824 |
| 7 | July 6, 2018 18:45 | July 7, 2018 15:45 | 21h | 956 | 1,998 |
| 8 | February 25, 2018 14:45 | February 26, 2018 01:45 | 11h | 947 | 3,435 |
| 9 | January 9, 2018 21:00 | January 9, 2018 23:00 | 2h | 946 | 711 |
| 10 | September 26, 2018 16:45 | September 26, 2018 22:30 | 5h 45m | 828 | 1,903 |
Outage episodes by size in 2018: 43 reached 100+ customers, 6 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 Union 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 |
|---|---|---|---|---|---|
| Powell Valley Electric Coop | 2018 | 2.8 hrs | 1.77 | 88 min | 1.44 |
| Knoxville Utilities Board | 2018 | 3.5 hrs | 1.84 | 2.1 hrs | 1.49 |
| City of Clinton - (TN) | 2018 | 77 min | 1.51 | 77 min | 1.51 |
| City of LaFollette | 2018 | 4.0 hrs | 3.34 | 3.4 hrs | 3.08 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 55% of Tennessee's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 9,474 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. Union County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Union County, TN 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/tennessee/union-county