County annual report · FIPS 47163
2025 Sullivan County, TN Power Outage Report
In 2025, customers in Sullivan County, TN went without power for an average of 2.7 hours, a total of 190K customer-hours (Tennessee average 4.3 hours). That ranks 52nd worst of 81 Tennessee counties and 2161st 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 Sullivan 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 | June 16, 2025 07:45 | June 17, 2025 00:15 | 16h 30m | 4,206 | 6,797 |
| 2 | December 18, 2025 22:00 | December 20, 2025 05:15 | 1d 7h | 4,026 | 22K |
| 3 | July 21, 2025 12:00 | July 21, 2025 14:45 | 2h 45m | 2,581 | 662 |
| 4 | September 16, 2025 11:30 | September 16, 2025 21:45 | 10h 15m | 2,327 | 1,890 |
| 5 | May 2, 2025 23:30 | May 3, 2025 03:15 | 3h 45m | 1,966 | 5,345 |
| 6 | April 2, 2025 12:00 | April 2, 2025 23:45 | 11h 45m | 1,959 | 3,790 |
| 7 | December 6, 2025 11:15 | December 6, 2025 20:00 | 8h 45m | 1,881 | 3,954 |
| 8 | June 6, 2025 19:30 | June 7, 2025 09:00 | 13h 30m | 1,878 | 2,547 |
| 9 | June 23, 2025 12:00 | June 23, 2025 23:45 | 11h 45m | 1,643 | 1,387 |
| 10 | May 22, 2025 12:30 | May 22, 2025 22:30 | 10h | 1,374 | 1,968 |
Outage episodes by size in 2025: 101 reached 100+ customers, 17 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 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 |
|---|---|---|---|---|---|
| Appalachian Power Co | 2024 | 29.5 hrs | 2.79 | 7.7 hrs | 2.07 |
| Johnson City - (TN) | 2024 | 11.0 hrs | 2.20 | 2.5 hrs | 1.24 |
| Kingsport Power Co | 2024 | 17.1 hrs | 1.80 | 2.7 hrs | 1.19 |
| City of Bristol - (TN) | 2024 | 9.1 hrs | 2.78 | 86 min | 1.57 |
| 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 n/a of Tennessee's customers in 2025; 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, 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/sullivan-county