County annual report · FIPS 47187
2023 Williamson County, TN Power Outage Report
In 2023, customers in Williamson County, TN went without power for an average of 1.6 hours, a total of 196K customer-hours (Tennessee average 11.1 hours). That ranks 64th worst of 83 Tennessee counties and 2457th of 2,977 nationally.
Compared with TN, the US and 2022
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Williamson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 1, 2023 01:45 | July 5, 2023 00:00 | 3d 22h | 11,340 | 48K |
| 2 | March 3, 2023 12:00 | March 9, 2023 23:00 | 6d 11h | 8,667 | 45K |
| 3 | March 25, 2023 03:30 | March 25, 2023 22:30 | 19h | 4,853 | 11K |
| 4 | January 3, 2023 12:45 | January 4, 2023 00:15 | 11h 30m | 3,305 | 860 |
| 5 | March 2, 2023 20:00 | March 2, 2023 20:15 | 15m | 3,130 | 783 |
| 6 | August 11, 2023 13:30 | August 11, 2023 20:30 | 7h | 2,920 | 1,874 |
| 7 | July 18, 2023 21:00 | July 20, 2023 02:15 | 1d 5h | 2,724 | 7,430 |
| 8 | May 10, 2023 12:30 | May 11, 2023 00:45 | 12h 15m | 2,648 | 842 |
| 9 | June 13, 2023 17:45 | June 13, 2023 23:30 | 5h 45m | 2,647 | 709 |
| 10 | July 8, 2023 21:45 | July 9, 2023 01:45 | 4h | 2,598 | 1,844 |
Outage episodes by size in 2023: 88 reached 100+ customers, 21 reached 1,000+ customers, 1 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 2023, 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 | 2023 | 5.1 hrs | 2.25 | 2.9 hrs | 1.76 |
| Middle Tennessee E M C | 2023 | 74 min | 1.13 | 51 min | 0.98 |
| City of Dickson | 2023 | 21.8 hrs | 3.83 | 6.1 hrs | 2.36 |
| Nashville Electric Service | 2023 | 21.9 hrs | 3.03 | 2.4 hrs | 1.74 |
| Columbia Power System - (TN) | 2023 | 3.3 hrs | 2.35 | 2.9 hrs | 2.00 |
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 2023; 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, 2023, 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/2023/tennessee/williamson-county