County annual report · FIPS 47173
2021 Union County, TN Power Outage Report
In 2021, customers in Union County, TN went without power for an average of 7.5 hours, a total of 71K customer-hours (Tennessee average 3.7 hours). That ranks 14th worst of 84 Tennessee counties and 989th of 2,974 nationally.
Compared with TN, the US and 2020
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Union 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 | March 9, 2021 15:15 | March 9, 2021 15:30 | 15m | 5,289 | 1,322 |
| 2 | May 21, 2021 22:15 | May 21, 2021 22:45 | 30m | 3,340 | 835 |
| 3 | May 7, 2021 20:45 | May 7, 2021 23:15 | 2h 30m | 3,333 | 8,333 |
| 4 | October 5, 2021 14:15 | October 5, 2021 16:15 | 2h | 3,200 | 1,762 |
| 5 | August 19, 2021 17:15 | August 19, 2021 17:30 | 15m | 2,976 | 744 |
| 6 | June 9, 2021 08:45 | June 9, 2021 17:30 | 8h 45m | 1,201 | 384 |
| 7 | April 7, 2021 12:45 | April 7, 2021 13:00 | 15m | 1,178 | 295 |
| 8 | March 23, 2021 14:30 | March 23, 2021 14:45 | 15m | 1,096 | 274 |
| 9 | June 21, 2021 20:30 | June 22, 2021 21:30 | 1d 1h | 1,001 | 3,698 |
| 10 | March 27, 2021 13:30 | March 28, 2021 02:30 | 13h | 984 | 1,309 |
Outage episodes by size in 2021: 60 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 Union 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 |
|---|---|---|---|---|---|
| Powell Valley Electric Coop | 2021 | 2.6 hrs | 1.81 | 2.6 hrs | 1.81 |
| Knoxville Utilities Board | 2021 | 2.4 hrs | - | 1.9 hrs | - |
| City of Clinton - (TN) | 2021 | 2.1 hrs | 1.53 | 1.7 hrs | 1.32 |
| City of LaFollette | 2021 | 6.8 hrs | 5.00 | 5.2 hrs | 4.00 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 73% of Tennessee's customers in 2021; 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, 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/tennessee/union-county