County annual report · FIPS 47139
2021 Polk County, TN Power Outage Report
In 2021, customers in Polk County, TN went without power for an average of 8.0 hours, a total of 78K customer-hours (Tennessee average 3.7 hours). That ranks 10th worst of 84 Tennessee counties and 939th 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 Polk 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 | April 17, 2021 11:00 | April 17, 2021 15:15 | 4h 15m | 3,876 | 6,702 |
| 2 | March 28, 2021 11:30 | March 30, 2021 20:45 | 2d 9h | 2,490 | 7,086 |
| 3 | October 7, 2021 12:00 | October 7, 2021 13:00 | 1h | 2,419 | 1,210 |
| 4 | June 24, 2021 06:00 | June 24, 2021 08:00 | 2h | 2,405 | 996 |
| 5 | May 7, 2021 18:15 | May 7, 2021 18:30 | 15m | 2,403 | 601 |
| 6 | August 16, 2021 03:30 | August 16, 2021 04:30 | 1h | 2,262 | 1,701 |
| 7 | August 30, 2021 14:45 | August 30, 2021 15:30 | 45m | 2,259 | 565 |
| 8 | June 20, 2021 05:30 | June 20, 2021 08:15 | 2h 45m | 2,251 | 2,254 |
| 9 | August 30, 2021 21:45 | August 31, 2021 04:15 | 6h 30m | 1,397 | 2,175 |
| 10 | March 25, 2021 22:15 | March 26, 2021 17:15 | 19h | 1,318 | 7,616 |
Outage episodes by size in 2021: 50 reached 100+ customers, 11 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 Polk 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 |
|---|---|---|---|---|---|
| Volunteer Electric Coop | 2021 | 8.6 hrs | 5.13 | 5.3 hrs | 4.64 |
| Fort Loudoun Electric Coop | 2021 | 4.5 hrs | 2.56 | 4.5 hrs | 2.56 |
| Tri-State Electric Member Corp | - | - | - | - | - |
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 ÷ 9,762 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. Polk County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Polk 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/polk-county