County annual report · FIPS 47187
2015 Williamson County, TN Power Outage Report
In 2015, customers in Williamson County, TN went without power for an average of 0.5 hours, a total of 60K customer-hours (Tennessee average 2.4 hours). That ranks 28th worst of 50 Tennessee counties and 2074th of 2,484 nationally.
Compared with TN, the US
Coverage line is EAGLE-I's share of Tennessee customers tracked each year.
Biggest outages in Williamson County, 2015
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 26, 2015 04:15 | September 26, 2015 05:00 | 45m | 5,413 | 3,870 |
| 2 | November 17, 2015 16:45 | November 17, 2015 21:00 | 4h 15m | 4,027 | 3,682 |
| 3 | November 10, 2015 01:00 | November 10, 2015 03:00 | 2h | 3,310 | 1,658 |
| 4 | July 28, 2015 21:30 | July 29, 2015 16:45 | 19h 15m | 3,240 | 3,851 |
| 5 | October 22, 2015 17:30 | October 22, 2015 18:00 | 30m | 2,588 | 648 |
| 6 | July 1, 2015 18:15 | July 1, 2015 20:30 | 2h 15m | 2,429 | 1,217 |
| 7 | October 20, 2015 13:30 | October 20, 2015 16:15 | 2h 45m | 1,979 | 524 |
| 8 | November 10, 2015 15:15 | November 10, 2015 23:45 | 8h 30m | 1,814 | 513 |
| 9 | September 10, 2015 16:45 | September 10, 2015 21:15 | 4h 30m | 1,683 | 730 |
| 10 | September 19, 2015 03:15 | September 19, 2015 16:45 | 13h 30m | 1,681 | 5,741 |
Outage episodes by size in 2015: 40 reached 100+ customers, 15 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 Williamson County reported on EIA Form 861 for 2015, 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 | 2015 | 6.7 hrs | 2.11 | 2.8 hrs | 1.78 |
| City of Dickson | 2015 | 3.1 hrs | 1.57 | 3.1 hrs | 1.57 |
| Nashville Electric Service | 2015 | 2.8 hrs | 1.84 | 1.9 hrs | 1.58 |
| Middle Tennessee E M C | - | - | - | - | - |
| Columbia Power System - (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 2015; 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, 2015, 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/2015/tennessee/williamson-county