County annual report · FIPS 47089
2021 Jefferson County, TN Power Outage Report
In 2021, customers in Jefferson County, TN went without power for an average of 1.1 hours, a total of 35K customer-hours (Tennessee average 3.7 hours). That ranks 62nd worst of 84 Tennessee counties and 2630th 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 Jefferson 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 | July 26, 2021 18:45 | July 26, 2021 22:45 | 4h | 4,179 | 8,836 |
| 2 | September 22, 2021 14:15 | September 22, 2021 19:30 | 5h 15m | 2,244 | 1,562 |
| 3 | June 12, 2021 21:00 | June 12, 2021 22:30 | 1h 30m | 1,766 | 1,325 |
| 4 | July 6, 2021 22:30 | July 6, 2021 23:30 | 1h | 1,766 | 1,766 |
| 5 | May 4, 2021 11:30 | May 4, 2021 16:15 | 4h 45m | 1,724 | 1,949 |
| 6 | June 21, 2021 21:00 | June 22, 2021 10:45 | 13h 45m | 1,717 | 4,104 |
| 7 | May 28, 2021 21:00 | May 29, 2021 16:45 | 19h 45m | 725 | 1,860 |
| 8 | December 11, 2021 13:45 | December 12, 2021 22:00 | 1d 8h | 530 | 3,346 |
| 9 | May 29, 2021 21:30 | May 29, 2021 23:15 | 1h 45m | 507 | 128 |
| 10 | April 7, 2021 01:30 | April 7, 2021 03:00 | 1h 30m | 481 | 722 |
Outage episodes by size in 2021: 17 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 Jefferson 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 |
|---|---|---|---|---|---|
| Knoxville Utilities Board | 2021 | 2.4 hrs | - | 1.9 hrs | - |
| Appalachian Electric Coop | 2021 | 3.3 hrs | 2.57 | 3.3 hrs | 2.57 |
| Holston Electric Coop, Inc | 2021 | 2.4 hrs | 1.83 | 2.1 hrs | 1.70 |
| Sevier County Electric System | 2021 | 3.7 hrs | 2.10 | 3.2 hrs | 2.00 |
| 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 73% of Tennessee's customers in 2021; 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, 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/jefferson-county