County annual report · FIPS 47187
2022 Williamson County, TN Power Outage Report
In 2022, customers in Williamson County, TN went without power for an average of 2.2 hours, a total of 274K customer-hours (Tennessee average 9.2 hours). That ranks 56th worst of 84 Tennessee counties and 2215th of 2,976 nationally.
Compared with TN, the US and 2021
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Williamson County, 2022
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 30, 2022 12:30 | March 31, 2022 10:30 | 22h | 10,189 | 8,769 |
| 2 | April 14, 2022 00:30 | April 16, 2022 01:00 | 2d | 10,062 | 40K |
| 3 | June 17, 2022 13:45 | June 19, 2022 02:00 | 1d 12h | 6,957 | 9,756 |
| 4 | December 23, 2022 02:15 | December 26, 2022 12:30 | 3d 10h | 6,921 | 30K |
| 5 | May 17, 2022 21:00 | May 18, 2022 02:15 | 5h 15m | 5,432 | 4,174 |
| 6 | July 28, 2022 09:45 | July 28, 2022 14:15 | 4h 30m | 5,092 | 3,151 |
| 7 | October 12, 2022 21:00 | October 14, 2022 03:30 | 1d 6h | 3,792 | 10K |
| 8 | July 29, 2022 10:15 | July 30, 2022 00:00 | 13h 45m | 3,586 | 2,161 |
| 9 | November 16, 2022 14:00 | November 17, 2022 01:30 | 11h 30m | 3,117 | 7,063 |
| 10 | November 30, 2022 04:15 | December 1, 2022 13:00 | 1d 8h | 3,105 | 23K |
Outage episodes by size in 2022: 107 reached 100+ customers, 43 reached 1,000+ customers, 2 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 Williamson County reported on EIA Form 861 for 2022, 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 |
|---|---|---|---|---|---|
| Duck River Elec Member Corp | 2022 | 5.7 hrs | 2.79 | 2.5 hrs | 2.04 |
| Middle Tennessee E M C | 2022 | 89 min | 1.83 | 61 min | 1.15 |
| City of Dickson | 2022 | 5.3 hrs | 4.84 | 4.2 hrs | 2.80 |
| Nashville Electric Service | 2022 | 7.9 hrs | 4.79 | 1.8 hrs | 1.51 |
| Columbia Power System - (TN) | 2022 | 8.0 hrs | 4.85 | 5.5 hrs | 2.36 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 75% of Tennessee's customers in 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 123,583 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. Williamson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Williamson County, TN annual power outage report, 2022, 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/2022/tennessee/williamson-county