County annual report · FIPS 47089
2023 Jefferson County, TN Power Outage Report
In 2023, customers in Jefferson County, TN went without power for an average of 11.5 hours, a total of 372K customer-hours (Tennessee average 11.1 hours). That ranks 17th worst of 83 Tennessee counties and 743rd of 2,977 nationally.
Compared with TN, the US and 2022
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Jefferson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 7, 2023 15:45 | August 11, 2023 02:15 | 3d 10h | 11,865 | 164K |
| 2 | November 29, 2023 11:30 | November 29, 2023 20:30 | 9h | 9,721 | 38K |
| 3 | April 1, 2023 09:00 | April 3, 2023 21:00 | 2d 12h | 8,009 | 36K |
| 4 | January 12, 2023 17:45 | January 14, 2023 20:00 | 2d 2h | 5,494 | 32K |
| 5 | July 15, 2023 15:45 | July 17, 2023 05:30 | 1d 13h | 3,381 | 7,178 |
| 6 | March 25, 2023 07:45 | March 26, 2023 04:00 | 20h 15m | 2,668 | 5,095 |
| 7 | May 7, 2023 21:00 | May 8, 2023 15:45 | 18h 45m | 2,274 | 6,905 |
| 8 | May 16, 2023 20:45 | May 17, 2023 20:00 | 23h 15m | 1,916 | 2,789 |
| 9 | August 14, 2023 12:15 | August 16, 2023 01:45 | 1d 13h | 1,895 | 5,707 |
| 10 | April 17, 2023 16:00 | April 17, 2023 22:45 | 6h 45m | 1,361 | 1,036 |
Outage episodes by size in 2023: 87 reached 100+ customers, 25 reached 1,000+ customers, 1 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 2023, 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 | 2023 | 6.0 hrs | 2.42 | 2.1 hrs | 1.50 |
| Appalachian Electric Coop | 2023 | 10.4 hrs | 3.67 | 3.2 hrs | 2.86 |
| Holston Electric Coop, Inc | 2023 | 3.9 hrs | 3.07 | 2.9 hrs | 2.40 |
| Sevier County Electric System | 2023 | 7.7 hrs | 3.02 | 3.6 hrs | 1.98 |
| 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 2023; 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, 2023, 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/2023/tennessee/jefferson-county