County annual report · FIPS 47163
2021 Sullivan County, TN Power Outage Report
In 2021, customers in Sullivan County, TN went without power for an average of 2.5 hours, a total of 175K customer-hours (Tennessee average 3.7 hours). That ranks 46th worst of 84 Tennessee counties and 2026th 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 Sullivan 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 | March 27, 2021 15:30 | March 30, 2021 23:30 | 3d 8h | 3,341 | 14K |
| 2 | August 25, 2021 22:30 | August 28, 2021 01:30 | 2d 3h | 2,148 | 3,512 |
| 3 | November 3, 2021 12:00 | November 3, 2021 21:30 | 9h 30m | 1,911 | 600 |
| 4 | August 13, 2021 03:45 | August 19, 2021 02:00 | 5d 22h | 1,832 | 23K |
| 5 | July 14, 2021 12:45 | July 15, 2021 03:15 | 14h 30m | 1,658 | 531 |
| 6 | September 5, 2021 18:45 | September 6, 2021 00:00 | 5h 15m | 1,649 | 456 |
| 7 | October 8, 2021 01:30 | October 8, 2021 03:30 | 2h | 1,642 | 2,968 |
| 8 | January 16, 2021 15:00 | January 16, 2021 17:00 | 2h | 1,548 | 2,708 |
| 9 | December 26, 2021 15:15 | December 26, 2021 19:45 | 4h 30m | 1,385 | 3,265 |
| 10 | March 10, 2021 11:15 | March 10, 2021 22:30 | 11h 15m | 1,339 | 4,615 |
Outage episodes by size in 2021: 81 reached 100+ customers, 18 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 Sullivan 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 |
|---|---|---|---|---|---|
| Appalachian Power Co | 2021 | 22.1 hrs | 2.24 | 7.7 hrs | 1.84 |
| Johnson City - (TN) | 2021 | 20 min | 0.25 | 20 min | 0.25 |
| Kingsport Power Co | 2021 | 3.8 hrs | 1.29 | 3.8 hrs | 1.29 |
| City of Bristol - (TN) | 2021 | 55 min | 1.20 | 55 min | 1.20 |
| City of Elizabethton - (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 ÷ 69,352 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. Sullivan County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Sullivan 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/sullivan-county