County annual report · FIPS 47089
2025 Jefferson County, TN Power Outage Report
In 2025, customers in Jefferson County, TN went without power for an average of 0.9 hours, a total of 28K customer-hours (Tennessee average 4.3 hours). That ranks 65th worst of 81 Tennessee counties and 2794th 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 Jefferson 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 | October 1, 2025 21:45 | October 1, 2025 23:30 | 1h 45m | 3,139 | 819 |
| 2 | May 4, 2025 00:15 | May 4, 2025 12:45 | 12h 30m | 2,258 | 1,023 |
| 3 | March 7, 2025 13:45 | March 19, 2025 21:00 | 12d 7h | 1,556 | 1,350 |
| 4 | February 1, 2025 15:00 | February 1, 2025 18:00 | 3h | 1,002 | 1,952 |
| 5 | May 26, 2025 05:15 | May 26, 2025 07:00 | 1h 45m | 812 | 1,420 |
| 6 | May 17, 2025 06:15 | May 18, 2025 19:00 | 1d 12h | 479 | 1,479 |
| 7 | February 7, 2025 02:45 | February 7, 2025 19:45 | 17h | 358 | 2,101 |
| 8 | September 9, 2025 20:45 | September 9, 2025 22:15 | 1h 30m | 322 | 483 |
| 9 | September 24, 2025 18:45 | September 24, 2025 22:30 | 3h 45m | 296 | 884 |
| 10 | December 19, 2025 03:15 | December 20, 2025 19:00 | 1d 15h | 286 | 2,660 |
Outage episodes by size in 2025: 23 reached 100+ customers, 4 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 Jefferson 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 |
|---|---|---|---|---|---|
| Knoxville Utilities Board | 2024 | 5.9 hrs | 1.86 | 3.2 hrs | 1.40 |
| Appalachian Electric Coop | 2024 | 15.5 hrs | 3.67 | 4.9 hrs | 2.86 |
| Holston Electric Coop, Inc | 2024 | 14.9 hrs | 3.45 | 3.3 hrs | 2.31 |
| Sevier County Electric System | 2024 | 5.5 hrs | 2.42 | 3.8 hrs | 2.12 |
| City of Newport - (TN) | - | - | - | - | - |
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 ÷ 32,422 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson 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/jefferson-county