County annual report · FIPS 47093
2021 Knox County, TN Power Outage Report
In 2021, customers in Knox County, TN went without power for an average of 3.7 hours, a total of 895K customer-hours (Tennessee average 3.7 hours). That ranks 35th worst of 84 Tennessee counties and 1629th 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 Knox 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 | November 11, 2021 23:45 | December 31, 2021 00:15 | 49d | 28,184 | 147K |
| 2 | August 1, 2021 04:00 | August 5, 2021 01:15 | 3d 21h | 13,282 | 7,728 |
| 3 | May 3, 2021 11:30 | May 6, 2021 15:15 | 3d 3h | 11,550 | 16K |
| 4 | May 12, 2021 06:30 | June 18, 2021 09:15 | 37d 2h | 8,435 | 190K |
| 5 | September 20, 2021 08:00 | September 24, 2021 11:45 | 4d 3h | 8,043 | 20K |
| 6 | July 6, 2021 08:30 | July 23, 2021 00:30 | 16d 16h | 7,197 | 48K |
| 7 | June 21, 2021 16:45 | June 25, 2021 10:45 | 3d 18h | 7,174 | 44K |
| 8 | March 16, 2021 11:15 | March 20, 2021 10:00 | 3d 22h | 6,982 | 15K |
| 9 | February 25, 2021 22:30 | February 26, 2021 01:30 | 3h | 6,929 | 3,478 |
| 10 | March 9, 2021 13:45 | March 10, 2021 00:30 | 10h 45m | 6,294 | 1,890 |
Outage episodes by size in 2021: 120 reached 100+ customers, 61 reached 1,000+ customers, 3 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 Knox 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 | - |
| City of Clinton - (TN) | 2021 | 2.1 hrs | 1.53 | 1.7 hrs | 1.32 |
| Fort Loudoun Electric Coop | 2021 | 4.5 hrs | 2.56 | 4.5 hrs | 2.56 |
| City of Lenoir - (TN) | 2021 | 2.6 hrs | 1.57 | 2.6 hrs | 1.57 |
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 ÷ 244,081 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. Knox County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Knox 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/knox-county