County annual report · FIPS 47173
2025 Union County, TN Power Outage Report
In 2025, customers in Union County, TN went without power for an average of 6.9 hours, a total of 65K customer-hours (Tennessee average 4.3 hours). That ranks 19th worst of 81 Tennessee counties and 1152nd of 3,000 nationally.
Compared with TN, the US and 2024
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Union County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 17, 2025 06:15 | May 19, 2025 06:15 | 2d | 2,516 | 14K |
| 2 | October 30, 2025 14:45 | October 30, 2025 19:30 | 4h 45m | 1,761 | 2,983 |
| 3 | May 28, 2025 11:30 | May 28, 2025 15:30 | 4h | 1,749 | 1,047 |
| 4 | August 28, 2025 12:45 | August 28, 2025 16:15 | 3h 30m | 1,508 | 2,806 |
| 5 | December 19, 2025 04:15 | December 20, 2025 14:30 | 1d 10h | 1,452 | 8,332 |
| 6 | November 24, 2025 20:45 | November 24, 2025 22:15 | 1h 30m | 1,384 | 1,043 |
| 7 | February 2, 2025 05:30 | February 2, 2025 10:30 | 5h | 1,081 | 1,282 |
| 8 | February 11, 2025 23:45 | February 12, 2025 08:00 | 8h 15m | 892 | 1,782 |
| 9 | March 5, 2025 05:45 | March 5, 2025 16:15 | 10h 30m | 746 | 986 |
| 10 | March 16, 2025 01:15 | March 16, 2025 22:45 | 21h 30m | 568 | 1,182 |
Outage episodes by size in 2025: 39 reached 100+ customers, 7 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 2025, 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 | 2024 | 8.4 hrs | 4.97 | 1.7 hrs | 3.38 |
| Knoxville Utilities Board | 2024 | 5.9 hrs | 1.86 | 3.2 hrs | 1.40 |
| City of Clinton - (TN) | 2024 | 4.4 hrs | 1.23 | 3.0 hrs | 1.02 |
| City of LaFollette | 2024 | 12.4 hrs | 5.87 | 4.6 hrs | 4.16 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about n/a of Tennessee's customers in 2025; 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, 2025, 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/2025/tennessee/union-county